RRB JE Mechanical-Machining Questionbank 1

Mechanical-Engineering

Which of the following statements best describes a special-purpose lathe used for heavy duty applications? RRB JE (Re-Exam) 04.06.2025

A T-lathe is used for machining flat plates and sheet metal components
A missile lathe is designed for lightweight parts with small diameters
A wheel lathe is designed for machining railway wheels, including journals and treads
A gap bed lathe is mainly used for cutting small, high-precision components

Explanation:

A special-purpose lathe is designed for specific machining applications. Among various types, a wheel lathe stands out for heavy-duty applications, particularly in machining railway components like wheels, journals, and treads.

What is the primary function of the headstock in a lathe machine? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

To control the movement of the carriage and tailstock
To hold and rotate the workpiece at different speeds
To provide support for cutting tools during operation
To adjust the feed mechanism for thread cutting

Explanation:

The primary function of the headstock is to hold and rotate the workpiece at various speeds. It is located at the left-hand end of the lathe bed and houses the main spindle, speed change mechanism, and drive motor.

What is the primary function of the tailstock in a lathe? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

To hold the cutting tool for machining operations
To change the direction of the spindle movement
To provide support and bearing for the rotating job
To control the speed of the spindle rotation

Explanation:

The tailstock provides support and bearing for the rotating workpiece during machining operations. It is located at the opposite end of the headstock on the lathe bed and can be adjusted along the bed.

What is the primary function of the tool post in a lathe machine? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

To support the compound rest and provide rotational movement
To control the feed rate and depth of cut during machining
To hold and adjust the tool for a suitable working position
To secure the workpiece firmly on the machine bed

Explanation:

The primary function of the tool post is to hold and adjust the tool for a suitable working position. It provides a secure and stable platform for the cutting tool, reducing vibrations and improving machining accuracy.

Lathe bed is made up of —-? RRB JE 29-08-2019

High carbon steel
High alloy steel
Mild steel
Cast iron

Explanation:

Lathe bed is made up of cast iron. It is a heavy, rugged casting made to support the working parts of the lathe. Its top section has guide ways that guide and align the major parts.

____ is fitted on the top of cross slide and is used to support the tool post and the cutting tool. RRB JE 29-08-2019

Carriage
Tail stock
Compound rest
Saddle

Explanation:

Compound rest is fitted on the top of cross slide and is used to support the tool post and the cutting tool. It can be swiveled to any angle for taper turning operations.

The capacity of a lathe is expressed as —-? RRB JE 29-08-2019

Horsepower and chuck diameter
Tool post size and lathe travel
Swing and distance between centres
Bed length and spindle speed

Explanation:

The capacity of a lathe is expressed as swing (largest diameter that can be rotated) and distance between centres.

____ is the process of making flat surfaces on a lathe. RRB JE 29-08-2019

Facing
Reaming
Drilling
Boring

Explanation:

Facing is the process of making flat surfaces on a lathe using a facing tool to cut a flat surface perpendicular to the workpiece’s rotational axis.

The largest diameter of work that can be carried between the centers of a lathe is known as —-? RRB JE 29-08-2019

Saddle
Swing
Socket
Spindle

Explanation:

The largest diameter of work that can be carried between the centers of a lathe is known as swing.

Which V block is used for checking triangle effect? RRB JE 29-08-2019

V block with 90-degree angle is used
V block with 120-degree angle is used
V block with 30-degree angle is used
V block with 60-degree angle is used

Explanation:

V-blocks with 120° angle are used for special purposes like checking triangle effects or taps. V-blocks with 90° angle are used for general purpose. Generally made of cast iron.

The horizontal feed in a lathe is controlled by —-? RRB JE 31-08-2019

Cross-slide
Apron
Tailstock
Headstock

Explanation:

The apron is a part of lathe clamped to the saddle. The horizontal feed in a lathe is controlled by apron, which holds gears, levers, and other components that push the cross slide.

____ is used to move the carriage automatically during threading. RRB JE 31-08-2019

Lead screw
Head wheel
Bed
Feed rod

Explanation:

Lead screw is the part of lathe machine used to move the carriage automatically during threading. It is a power screw usually having an acme thread.

Which of the following part of lathe serve as housing for the driving pulleys and back gears? RRB-JE 30.08.2019, Ist Shift

Carriage
Bed
Tail stock
Head stock

Explanation:

Head stock is mounted permanently on the inner guide ways at the left-hand side of the lathe bed. It transmits drive from motor to work, accommodates shafts, gears, levers, and provides housing for drive mechanism, pulleys, gears, and motor.

A steel shaft of 25 mm diameter is turned at a cutting speed of 50 meters per minute. Find the r.p.m. of the shaft. RRB-JE 30.08.2019, Ist Shift

222.5
35
700
637

Explanation:

v = πDN, 50 = π × 0.025 × N, N = 50/(π × 0.025) = 636.62 ≈ 637 rpm.

Lathe bed is made up of —-? RRB-JE 29.08.2019, Ist Shift

High carbon steel
High alloy steel
Mild steel
Cast iron

Explanation:

Lathe bed is made from grey or nodular cast iron or fabricated by welding steel plates. It is the base or foundation of the lathe. Accuracy of lathe depends on the accuracy of the bed.

____ is fitted on the top of cross slide and is used to support the tool post and the cutting tool. RRB-JE 29.08.2019, Ist Shift

Carriage
Tail stock
Compound rest
Saddle

Explanation:

Compound rest is fitted on the top of cross slide and is used to support the tool post and the cutting tool.

The capacity of a lathe is expressed as —-? RRB-JE 29.08.2019, Ist Shift

Horsepower and chuck diameter
Tool post size and lathe travel
Swing and distance between centres
Bed length and spindle speed

Explanation:

The capacity of lathe bed is expressed as swing and distance between centres. Lathe specifications include length of bed, maximum distance between centres, height of centre over bed, swing over bed, swing over carriage, spindle hole size, and spindle speed.

The horizontal feed in a lathe is controlled by —-? RRB JE CBT-II 31.08.2019 IInd Shift

Cross slide
Apron
Tailstock
Headstock

Explanation:

Apron is made of cast iron like a hollow box. It controls carriage movement left and right through hand and multiple handles/levers providing automatic movement. The feed rod and lead screw pass through its middle.

In which of the following operation of lathe machine is the tool NOT fed in a straight path? RRB JE CBT-II 31.08.2019 IInd Shift

Form turning
Contour turning
Facing
Taper turning

Explanation:

In contour turning operation of the lathe machine, the tool is not fed in a straight path.

____ is used to move the carriage automatically during threading. RRB JE CBT-II 31.08.2019 IInd Shift

Lead screw
Head wheel
Bed
Feed rod

Explanation:

Lead screw is a long shaft of nickel on which acme threads are cut. It passes through the apron and is used for cutting threads of different pitches.

An accurate lathe in India is identified as —-? (RRB Mumbai C&G JE 25.10.2009)

Mark I
Accurate I
Grade I
Precision I

Explanation:

Accurate lathe in India is identified as Grade-I. Lathe is a machine tool used for producing cylindrical surfaces by revolving the workpiece.

Lathe mandrels can be termed as —-? (RRB Jammu JE 25.10.2009)

template
gauge
fixture
jig

Explanation:

Workpieces that cannot be held between centres (because axis has been drilled or bored) and are not suitable for chuck or face plate are machined on a mandrel. Lathe mandrels can be termed as fixtures.

Lathe accessories are devices added to a lathe to improve its —-? (RRB Allahabad JE 25.10.2009)

finishing
versatility
depth
feed

Explanation:

Lathe accessories are used for holding and supporting work or cutting tools. They improve versatility of lathe. Different accessories include centres, chucks, lathe dog, drive plate, face plate, angle plate, mandrel, steady rest, follower rest, etc.

The point angle of ____ is 90°. (RRB Patna JE 25.10.2009) RRB Bhopal Section Engineer, 24.11.2002

centre punch
starting punch
Pick punch
Pin punch

Explanation:

Point angle of centre punch is 90°. Centre punch is a short steel bar with hardened conical point used for marking centres of holes. Point angle of dot punch is 60°, point angle of prick punch is 30°.

The standard ground drill has a point angle of —-? (RRB Allahabad SSE 09.09.2012)

68°
92°
118°
122°

Explanation:

Standard ground drill has point angle 118°. For softer material it is less than 118° and for harder material it is greater than 118°. Bakelite and plastic: 90°, Mild steel and brass: 118°, HSS and Nickel alloy: 135°.

The included angle of lathe centre is —-? (RRB Kolkata SSE 09.09.2012)

30°
60°
90°
45°

Explanation:

Lathe centres have standard Morse taper shank at one end and a 60° point angle at the other end. Types include ordinary centre, reverse centre, half centre, ball centre, tipped centre, pipe centre, revolving centre, etc.

In a lathe machine back gearing arrangement is provided to —-? (RRB Bhopal SSE 09.09.2012)

Obtain more number of speeds which are lower in magnitude
Obtain more number of speeds which are higher in magnitude
Obtain less number of speeds which are higher in magnitude
Obtain less number of speeds which are lower in magnitude

Explanation:

Back gearing arrangement is provided to obtain more number of speeds which are lower in magnitude. It is mounted at the back of the headstock and consists of four gears that reduce the speed of the stepped pulley.

In a lathe, apron is to control the movement of —-? (RRB Jammu SSE 09.09.2012)

chuck
tail stock
carriage
head stock

Explanation:

Carriage is located between head stock and tail stock. It consists of apron, saddle, cross slide, compound rest, and tool post. Apron contains gears and clutches for transmitting motion from feed rod to carriage.

Lathe bed is usually made of —-? (RRB Bhubneshwar JE II 29.11.2008)

structural steel
stainless steel
cast iron
mild steel

Explanation:

Lathe bed is usually made of cast iron. It is the basic foundation on which head stock, carriage, and tail stock are positioned. Types include flat type, inverted V-type, and combination type.

No lubricant is required when cutting threads in —-? (DMRC JE 22.09.2017)

tungsten carbide
mild steel
cast iron
high speed steel

Explanation:

No lubricant is required when cutting threads in cast iron due to its self-lubricating properties from graphite content.

Which of the following is NOT a part of a typical mechanical press? (JMRC JE 10.06.2017)

Fly wheel
Crank, eccentric of other driving mechanism
Ram
Saddle and swivel table

Explanation:

Parts of mechanical press include base, frame, ram, bolster plate, pitman, flywheel, crank and eccentric, clutch, and brake. Saddle and swivel table is not a part of typical mechanical press.

Which one of the following gauges is used to align the lathe tool with the work? (RRB Bhubneshwar JE-11 19.12.2010)

Try square
Thread gauge
Straight gauge
Center gauge

Explanation:

Centre gauge is used to align the lathe tool with the work and to check the accuracy of threaded tools and screw threads.

6 cm diameter and 20 cm long work piece rotates at 200 rpm. Axial feed is 0.1 mm per revolution. The time taken to machining is —-? (RRB Allahabad SSE 19.12.2010)

6 minutes
20 minutes
10 minutes
None of these

Explanation:

t = L/(f × N) = 200/(0.1 × 200) = 10 minutes.

The spindle speed range in a general purpose lathe is divided into steps which approximately follows —-? (RRB Mumbai SSE 05.10.2008)

harmonic progression
logarithmic progression
arithmetic progression
geometric progression

Explanation:

Spindle speed range in a general purpose lathe is divided into steps approximately following geometric progression.

Which component of Lathe serves the following purposes? 1. Giving an outer bearing and support the circular job being turned on centers. 2. Set or adjusted for alignment or non-alignment with respect to the spindle center and carries a center called dead center for supporting one end of the work. (RRB Mumbai JE 19.12.2010)

Carriage
Tail stock
Head stock
Bed

Explanation:

Tail stock provides outer bearing and support for circular job being turned on centres. It carries the dead centre for supporting one end of the work.

Using which method a multi-start thread is cut on a lathe? (RRB Mumbai SSE 19.12.2010)

By chase
By a single-point tool
By die head
By a split die

Explanation:

For cutting multi-start thread, single point cutting tools are used. Multiple start thread has pitch equal to thread lead divided by number of thread starts.

The grooves on the drills are called —-? (DMRC JE 2013)

tang
land
flute
body clearance

Explanation:

The grooves on drills are called flutes. Point is the cone-shaped cutting end with dead centre and cutting edges. Shank is the driving end. Tang is the part fitting into the drilling machine spindle.

The machining operation of threading can be defined as —-? (Konkan Railway STA 2017)

Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface

Explanation:

Threading is cutting helical grooves on external cylindrical surface. Spot facing is smoothing surface around a hole. Reaming is sizing and finishing a small hole. Trepanning is producing a hole by removing metal along circumference.

The movement of the work piece per double stroke in cutting speed is called —-? (Konkan Railway SSE 2015)

Depth of cut
Milling
Grooving
Feed

Explanation:

Feed is the movement of the workpiece per double stroke in cutting speed. It is the distance the cutting tool advances along the work for every revolution of the spindle.

How many jaws are used in self-centering chuck? (RRB Chandigarh SSE 25.10.2009)

Explanation:

Self-centering chuck consists of three jaws. It is used for regular shape jobs. Other types include four jaw chuck, two jaw chuck, combination chuck, magnetic chuck, collet chuck, and air/hydraulic chuck.

Collets are also called as —-? (RRB Gorakhpur RDSO SSE 25.10.2009)

wire chucks
combination chucks
self centering chucks
air chucks

Explanation:

Collet chuck is also known as self-centering chuck. These are small chucks that fit into the headstock spindle for holding bar stock, useful for accurate centering and quick setting.

For ____, collets seat directly in the spindle. (RRB Malda SSE 25.10.2009 RRB Secunderabad Section Engineer (Mech), 29.06.2009)

Tool room lathe
Bench lathe
Manufacturing lathe
Special purpose lathe

Explanation:

For special purpose lathe, collets seat directly in the spindle. Special purpose lathes are used for heavy-duty production of identical parts and specific functions.

Which one of the following lathe operations is not done on a workpiece held in between centres? (RRB Mumbai C&G SSE 25.10.2009)

Parting off
Undercutting by plunging
Thread cutting
Knurling

Explanation:

While performing parting off operation, the workpiece should not be held between centres. Parting off is a lathe application where an orthogonal cut in the radial direction splits a round workpiece into two pieces.

Which of the following is the increasing order of cutting speed for cutting tool material? (RRB Bhopal TM SSE 25.10.2009)

High Carbon Steel, Solid Tungsten Carbide, HSS, Ceramics & Diamond
High Carbon Steel, HSS, Solid Tungsten Carbide, Ceramics & Diamond
Ceramics, High Carbon Steel, Solid Tungsten Carbide, HSS & Diamond
Diamond, High Carbon Steel, Solid Tungsten Carbide, HSS & Ceramics

Explanation:

Cutting speed order: High Carbon Steel (10 m/min, 250°C) < HSS (30 m/min, 600°C) < Solid Tungsten Carbide < Ceramics (200-600 m/min, 1200°C) < Diamond (1000 m/min, 3000°C).

Which of the following is not a work holding device in a lathe? (RRB Bangalore SSE 09.09.2012)

Mandrel
Follower rest
Face plate
Tool post

Explanation:

Tool post does not hold workpiece, it holds the tool. Lathe accessories for holding work include centres, chucks, clutch plate and dogs, mandrel, follower rest, face plate, and angle plate.

Setover on a lathe depends upon —-? (RRB Gorakhpur Design SSE 09.09.2012)

diameter of workpiece
amount of taper
length of workpiece
rake angle

Explanation:

Setover on lathe depends upon amount of taper. Taper turning methods include form tool, swivelling compound rest, tail stock set over (only external taper), and combination of longitudinal and cross feed.

Match List-1 with List-11 and select the correct answer: (RRB Jammu SSE 09.09.2012) (RRB Bhubneshwar JE II 29.11.2008)

A-2, B-4, C-1, D-3
A-3, B-4, C-1, D-2
A-2, B-1, C-4, D-3
A-3, B-1, C-4, D-2

Explanation:

Lathe → Lead screw, Shaper → Rocker arm, Drilling machine → Flute, Milling machine → Universal indexing.

Name the part to support the tool post and swivel on the cross slide to any angle. (DMRC JE 22.09.2017)

Face Plate
Saddle
Compound Rest
Spindle

Explanation:

Compound rest supports the tool post and swivels on the cross slide to any angle. Carriage consists of apron, saddle, cross slide, compound rest (swivel base and top slide), and tool post.

Which one of the following is the characteristic for capstan lathe? (BMRCL JE 24 Feb. 2019)

Rate of production is low
Labour cost is high
Used for handling jobs of varying shapes and sizes
Capstan head is mounted on a slide

Explanation:

Capstan lathe is a lightweight machine. Turret tool head (capstan head) is mounted over a ram, and the ram is mounted over a saddle. Feed is provided by moving the ram.

A lead screw with half nuts in a lathe, free to rotate in both directions has —-? (RRB Allahabad JE 19.12.2010)

V-threads
Withthroughtreads
Buttress threads
Acme threads

Explanation:

A lead screw with half nuts in a lathe, free to rotate in both directions, has acme thread. Lead screw translates turning motion into linear motion for thread cutting.

For cutting of brass with single point cutting tool on a lathe, tool should have —-? (RRB JE (Shift-III), 30.08.2015)

Negative rake angle
Positive rake angle
Zero rake angle
Zero side relief angle

Explanation:

For cutting brass with single point cutting tool, zero rake angle is used because brass is soft and has sticking tendency. Zero rake angle provides greater surface finish.

Find the amount of taper for a length of 100 mm, D = 90 mm, d = 80 mm. (RRB Mumbai JE 05.10.2008)

10:1
2:20
1:0.1
1:1

Explanation:

Conicity = (D-d)/L = (90-80)/100 = 10/100 = 1/10 = 1:10. Note: Taper ratio is typically expressed as 1:10 (not 1:1). The answer given in key is (d) 1:1 – but this appears to be an error. Correct taper ratio would be 1:10.

For which of the following operations on a lathe, the slowest speed is adopted? (RRB Bangalore SSE 09.09.2012)

Plain turning
Taper turning
Thread turning
Under cutting

Explanation:

Thread turning requires the slowest speed because it requires maximum accuracy. The lathe carriage moves positively a certain distance for each revolution of the spindle.

The nature of directrix required to produce cylindrical surface in the lathe is —-? (RRB Gorakhpur Design SSE 09.09.2012)

plain curve
circular
inclined line
straight line

Explanation:

The nature of directrix required to produce cylindrical surface in the lathe is a straight line.

Capstan lathe is also known as —-? (RRB Allahabad JE 09.09.2012) RRB Bangalore Material Engg. 21.11.2004

tartet lathe
engine lathe
ram type lathe
cam type lathe

Explanation:

Capstan lathe is also known as ram type turret lathe. It is a lightweight machine with a hexagonal tool post that can attach six tools at a time.

The material commonly used for making machine tool bed is —-? (RRB Bhubneshwar JE II 29.11.2008) (M.P. Sub Engineer 2015) (Bihar JE, 2016) (Uttrakhand JE Paper-II 2008)

Mild steel
Aluminium
Brass
Cast Iron

Explanation:

Machine tool bed is made of cast iron. It is the basic foundation on which head stock, carriage, and tool post are positioned. It should be strong with good damping property.

When turning long shaft on a lathe, bending can be prevented by —-? (RRB Jammu SSE 09.09.2012)

running the shaft at low speed
using high speed
using steady machine
using steady rest

Explanation:

When turning long shaft on lathe, bending can be prevented by using steady rest. It consists of a frame and three adjustable supports to prevent springing of slender work.

Which of the following is not a category of machine tools? (RRB Allahabad SSE 09.09.2012)

General purpose machine
Special purpose machine
Limited purpose machine
Multi-purpose machine

Explanation:

Multipurpose machine is not a category of machine tools. Shaper, planer, drilling, boring, grinding are classified under general purpose, special purpose, and limited purpose.

Which of the following dimensions can be used to indicate the capacity of an engine lathe? (RRB Gorakhpur RDSO SSE 25.10.2009)

1,2 and 4
1,3 and 5
1,2,3 and 4
1,2,3,4 and 5

Explanation:

Engine lathe specification includes: height of centres, swing over bed, maximum length between centres, swing over spindle, max bore diameter of spindle, number of feeds and feed range.

In lathe, the carriage and tailstock are guided on —-? (RRB Allahabad JE 25.10.2009)

Same guide ways
Different guide ways
Not guided on guide ways
Both (a) and (b)

Explanation:

In lathe, the carriage and tailstock are guided on the same guide ways.

What is the number of jaws in a self-centred chuck of a lathe? (RRB Mumbai C&G JE 25.10.2009)

Eight
Five
Four
Three

Explanation:

Self-centred jaw consists of three jaws.

Swing diameter over bed as compared to that over carriage is —-? (RRB Jammu JE 25.10.2009) RRB Kolkata Apprentice Engg., 14.10.2001

More
Less
Same
None of these

Explanation:

Swing diameter over bed is more than swing diameter over carriage.

Centre used for holding hollow jobs on a lathe is —-? (RRB Allahabad JE 25.10.2009)

Half centre
Pipe centre
Square centre
Revolving centre

Explanation:

Pipe centre is used for holding hollow jobs on a lathe. Other centres include ordinary centre, ball centre, tipped centre, half centre (for facing), and revolving centre (for heavy work at high speed).

A tool used in cutting an external thread is called a —-? (DMRC JE 2013)

Twist drill
Tap
Die
End mill

Explanation:

A die is used for cutting external threads on cylindrical materials such as a rod, creating a male threaded piece like a bolt.

Capstan nut can be rotated by —-? (RRB Patna JE 25.10.2009)

“1” spanner
pin spanner
ring spanner
double ended spanner

Explanation:

Capstan nut can be rotated by pin spanner. It has holes drilled in the curved surface for placing a tommy bar.

The material most commonly used for manufacturing of machine tool beds is —-? (RRB Allahabad SSE 09.09.2012)

MS
Gray CI
White CI
Galvanized iron

Explanation:

Machine tool beds are made of grey cast iron due to its good compressive strength and good damping characteristics.

What should be the included angle of the cutting tool used for machining metric threads in a thread-cutting operation? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

45 degrees
60 degrees
55 degrees
75 degrees

Explanation:

The included angle of the cutting tool used for machining metric threads is 60° as per the metric screw thread profile standard adopted by BIS.

Back rake of a turning tool is measured on its —-? RRB JE 29-08-2019

Machine longitudinal plane
Orthogonal plane
Normal plane
Machine transverse plane

Explanation:

Back rake of a turning tool is measured on its machine transverse plane (elevation). It is the angle between the face and line parallel to the length passing through the tip.

Find the tool life equation, if a tool life at 80 min is obtained at a cutting speed of 30 m/min and 8 min at 60 m/min. RRB JE 29-08-2019

VT⁰·³ = C
VT⁰·⁷ = C
VT⁰·⁵ = C
VT⁰·⁴ = C

Explanation:

Using Taylor’s tool life equation VT^n = C: 30×(80)^n = 60×(8)^n, (80/8)^n = 60/30, 10^n = 2, n = 0.3. Therefore VT^0.3 = C.

____ is the intersection of the flank and the base of the tool. RRB JE 29-08-2019

Heel
Face
Nose
Shank

Explanation:

Heel is the intersection of the flank and base of the tool. Shank is the main body, face is where chip slides, flank is the surface below cutting edge, and nose is intersection of cutting edges.

A tool has the signature form as 8, 8, 5, 5, 6, 6, 1 as per American Standard Association. In this, 1 represents —-? RRB JE 29-08-2019

Back rake angle
Side cutting edge
Nose radius
Side relief angle

Explanation:

ASA tool signature: Back rake angle (8), Side rake angle (8), End relief angle (5), Side relief angle (5), End cutting edge angle (6), Side cutting edge angle (6), Nose radius (1 in inch/mm).

Which of the following part of lathe serve as housing for the driving pulleys and back gears? RRB JE 29-08-2019

Carriage
Bed
Tail stock
Head stock

Explanation:

Head stock has driving pulley and back gears. It is situated on the left side of the bed and carries the spindle and chuck for holding the workpiece.

Which of the following is a single point cutting tool? RRB JE 29-08-2019

Hacksaw blade
Grinding wheel
Parting tool
Milling cutter

Explanation:

Parting tool is a single point cutting tool. Single point cutting tools are mostly used on lathe, shaper, and planer.

Which of the following is a junction of side and end of cutting edge in single point cutting tool? RRB JE 31-08-2019

Base
Flank
Nose
Heel

Explanation:

Nose is the junction of side and end cutting edge. It has curvature to increase the strength of the tip.

A cutting tool can never have its —-? RRB JE 31-08-2019

Clearance angle negative
Rake angle positive
Clearance angle positive
Rake angle negative

Explanation:

A cutting tool can never have its clearance angle negative. Rake angle can be positive, negative, or zero. Positive rake angle is used for ductile materials, negative for high strength materials.

The sum of the clearance angle, rake angle and cutting wedge angle is always equal to —-? RRB JE 31-08-2019

90°
180°
360°
45°

Explanation:

Rake angle (α) + Cutting wedge angle (ψ) + Clearance angle (γ) = 90°.

Which of the following is a single point cutting tool? RRB JE 30.08.2019, Ist Shift

Hacksaw blade
Grinding wheel
Parting tool
Milling cutter

Explanation:

Parting off tool is a single point cutting tool with only one main cutting edge for material removal in a single pass. Other examples include turning tool, shaping tool, planning tool, slotting tool, boring tool, and flycutter.

Back rake of a turning tool is measured on its —-? RRB-JE 29.08.2019, Ist Shift

Machine longitudinal plane
Orthogonal plane
Normal plane
Machine transverse plane

Explanation:

Back rake angle is measured on machine transverse plane. It is the angle between rake face and a line parallel to the base through the tip.

The process of enlarging the holes of accurate sizes is called —-? RRB-JE 29.08.2019, Ist Shift

Drilling
Reaming
Knurling
Counter boring

Explanation:

Reaming is the process of enlarging holes to accurate sizes with a smooth finish. Boring enlarges a hole that has already been drilled.

Find the tool life equation, if a tool life at 80 min is obtained at a cutting speed of 30 m/min and 8 min at 60 m/min. RRB-JE 29.08.2019, Ist Shift

VT⁰·³ = C
VT⁰·⁷ = C
VT⁰·⁵ = C
VT⁰·⁴ = C

Explanation:

Using Taylor’s equation: 30×(80)^n = 60×(8)^n, (80/8)^n = 60/30, 10^n = 2, n = 0.30. Therefore VT^0.3 = C.

____ is the intersection of the flank and the base of the tool. RRB-JE 29.08.2019, Ist Shift

Heel
Face
Nose
Shank

Explanation:

Heel is the intersection of the flank and base of the tool. Face is where chip slides, shank is the main body, nose is intersection of cutting edges, and flank is the surface below the cutting edge.

A tool has the signature form as 8, 8, 5, 5, 6, 6, 1 as per American Standard Association. In this, 1 represents —-? RRB-JE 29.08.2019, Ist Shift

Back rake angle
Side cutting edge
Nose radius
Side relief angle

Explanation:

ASA tool signature: 1 represents nose radius (in mm). The elements are: back rake angle (8), side rake angle (8), end relief angle (5), side relief angle (5), end edge angle (6), side cutting edge angle (6), nose radius (1).

Which of the following is a junction of side and end of cutting edge in single point cutting tool? RRB JE CBT-II 31.08.2019 IInd Shift

Base
Flank
Nose
Heel

Explanation:

Nose radius is the junction of side cutting edge and end cutting edge. It strengthens the tool nose and improves surface finish. Proper nose radius improves machinability and increases tool life.

A cutting tool can never have its —-? RRB JE CBT-II 31.08.2019 IInd Shift

Clearance angle negative
Rake angle positive
Clearance angle positive
Rake angle negative

Explanation:

A cutting tool can never have its clearance angle negative.

Which of the following operations does NOT use a Multiple-point cutting tool? RRB JE CBT-II 31.08.2019 IInd Shift

Milling
Drilling
Turning
Broaching

Explanation:

Turning does not use a multi-point cutting tool. It is done by a single point cutting tool.

The sum of the clearance angle, rake angle and cutting wedge angle is always equal to —-? RRB JE CBT-II 31.08.2019 IInd Shift

90°
180°
360°
45°

Explanation:

Rake angle + Cutting wedge angle + Clearance angle = 90°.

The following tool signature is specified for a single-point cutting tool in American system: 10,12,8,6,15,20,3. What does the value ’12’ represent? (BMRCL JE 24 Feb.2019)

Side cutting-edge angle
Side rake angle
Back rake angle
Side clearance angle

Explanation:

ASA tool signature: Back rake angle (10°), Side rake angle (12°), End relief angle (8°), Side relief angle (6°), End cutting angle (15°), Side cutting angle (20°), Nose radius (3 mm).

Which of the following is a single point cutting tool? (RRB Bhubneshwar JE-II 19.12.2010) (Punjab Irrigation JE 29.07.2018)

Grinding wheel
Parting tool
Milling cutter
Hacksaw blade

Explanation:

Parting tool is a single point cutting tool.

The only angle on which the strength of the tool depends is —-? (SSC JE 2014 Evening) (RRB Allahabad JE 19.12.2010)

rake angle
cutting angle
lip angle
clearance angle

Explanation:

Strength of tool depends upon rake angle. It affects surface finish, controls cutting force, and allows chip flow direction.

The angle between face of the blade and a line passing through the nose parallel to the cutter axis is —-? (RRB Allahabad SSE 19.12.2010)

Face relief angle
Radial rake
Axial rake
Face clearance angle

Explanation:

Axial rake is the angle between the face of the blade and a line passing through the nose parallel to the cutting axis. Radial rake is measured on a cross section to the axial centerline.

The angle between cleared flank of the tooth back of relieved surface and cutter face is called —-? (RRB Mumbai SSE 05.10.2008)

Peripheral relief angle
Peripheral clearance angle
Face clearance angle
End relief angle

Explanation:

The angle between cleared flank of the tooth back of relieved surface and cutter face is called face clearance angle.

If the value of rake angle is a large positive value, then —-? (RRB Mumbai JE 19.12.2010)

material is not deformed
material is forced back to itself
material is deformed less in the chip
material is deformed more in the chip

Explanation:

Large positive rake angle: material is deformed less in the chip, used for soft and ductile materials. It increases sharpness, decreases friction, cutting force, and power consumption, but decreases strength if too high.

High speed steel belongs to the category of ____ steel. (RRB Mumbai SSE 19.12.2010)

alloy
stainless
low carbon
high carbon

Explanation:

High speed steel belongs to alloy steel category. Alloy steels contain appreciable concentrations of other elements like chromium, nickel, molybdenum, etc., to improve properties.

Relief angle in a cutting tool generally varies from —-? (DMRC JE 2013)

1° – 2°
2° – 4°
5° – 15°
15° – 25°

Explanation:

Relief angle generally varies from 5°-15°. It reduces friction and tool wear. Excessive clearance angle weakens the tool.

Which of the following is a single point cutting tool? (DMRC JE 20.04.2018)

Hack saw blade
Milling cutter
Grinding wheel
Parting tool

Explanation:

Parting tool is a single point cutting tool. Hack saw blade and milling cutter are multipoint cutting tools, grinding wheel has multiple cutting points.

Which of the following among the given options is a single point cutting tool? (Konkan Railway STA 2017)

Milling cutter
Hack saw blade
Turning tool
Grinding wheel

Explanation:

Turning tool is a single point cutting tool. Other single point tools include shaping tool, planning tool, slotting tool, boring tool, and flycutter.

A Tool signature consists of —-? (Konkan Railway TA 2017) (RRB Kolkata Diesel JE 25.10.2009) (SSC JE, 2013)

Two elements
Five elements
Four elements
Seven elements

Explanation:

ASA tool signature consists of seven elements: Back rake angle, Side rake angle, End relief angle, Side relief angle, End cutting angle, Side cutting angle, Nose radius.

The purpose of providing side rake angle on the cutting tool is to —-? (RRB Mumbai C&G SSE 25.10.2009)

Avoid work from rubbing against tool
Control chip flow
Strengthen tool edge
Break chips

Explanation:

The purpose of providing side rake angle is to control chip flow. Side rake angle ranges between 5-15° and is measured in a plane perpendicular to the base and parallel to the width.

The life of a single point cutting tool increases with which of the following? (RRB Patna JE 25.10.2009)

Decrease in nose radius
Decrease in rake angle
Increase in side cutting edge angle
Increase in cutting speed

Explanation:

Tool life increases when rake angle decreases. Tool life also increases with increase in nose radius, decrease in cutting velocity, decrease in feed, and decrease in depth of cut.

A hacksaw blade is specified by its —-? (RRB Bhopal TM SSE 25.10.2009)

Length
Material
Width
Number of teeth

Explanation:

A hacksaw blade is specified by its length. It is a multipoint cutting tool generally made of carbon steel or high speed steel.

What is the angle made by the face of the tool and the plane parallel to the base of cutting tool called as? (RRB Allahabad SSE 09.09.2012)

Rake angle
Cutting angle
Clearance angle
Lip angle

Explanation:

Rake angle is the angle made by the face of the tool and the plane parallel to the base. It controls chip flow direction, cutting force, power consumption, surface finish, and affects tool strength.

In metal cutting operation, the approximate ratio of heat distributed among chip, tool and work, in that order is —-? (RRB Bhopal SSE 09.09.2012)

80:10:10
33:33:33
20:60:10
10:10:80

Explanation:

Heat distribution: 80-85% in primary shear zone (chip), 16-20% in secondary shear zone (tool), 1-5% at tool-work interface. Order: Q_chip > Q_tool > Q_work.

Material Removal Rate in Electro Chemical Machining depends on —-? (RRB Chandigarh SSE 09.09.2012)

Hardness
Thermal Conductivity
Ductility
Atomic Weight

Explanation:

MRR in ECM depends on atomic weight, current, density, valency, and Faraday’s constant. MRR = (A×I)/(ρ×Z×F), where A is gram atomic weight.

Crater wear is predominant in —-? (RRB JE (Shift-II), 29.8.2015/ESE: 1995)

Carbon steel tools
Tungsten carbide tools
High speed steel tools
Ceramic tools

Explanation:

Crater wear is predominant in tungsten carbide tools. It occurs mainly on the face of the tool at 2-3 mm from the cutting edge, caused by friction between chip and rake face.

The relationship between tool life (T) and cutting speed (V) is expressed as, where n and C are constant —-? (RRB Jammu SSE 09.09.2012)

V/T = C
T/V = C
V^n T = C
VT^n = C

Explanation:

Taylor’s tool life equation: VT^n = C. For HSS, n = 0.08-0.2; Cast alloy, n = 0.1-0.15; Carbide, n = 0.25-0.46; Ceramic, n = 0.5-0.7.

Crater wear takes place in a single point cutting tool at the —-? (RRB Allahabad JE 09.09.2012)

tip
face
flank
side rake

Explanation:

Crater wear occurs on the face of the tool at 2-3 mm from the cutting edge. It is caused mainly by diffusion.

The approximate variation of the tool life exponent ‘n’ of cemented carbide tool is —-? (RRB Bhubneshwar JE II 29.11.2008)

0.03 to 0.08
0.08 to 0.20
0.20 to 0.48
0.48 to 0.70

Explanation:

Tool life exponent ‘n’ for cemented carbide tools is 0.2-0.5 (approximately 0.20-0.48). HSS: 0.08-0.2, Ceramic: 0.5-0.7.

The tool life of a tool is said to be over if —-? (RRB Bhubneshwar JE-II 19.12.2010)

the tool has failed and a poor surface finish is obtained
sudden increase in power and cutting forces takes
overheating and fuming due to friction occurs in addition to dimensional instability
All option are correct

Explanation:

Tool life is over if: tool has failed with poor surface finish, sudden increase in power and cutting forces, and overheating/fuming due to friction with dimensional instability.

Match List-I (Cutting tool material) with List-II (typical value of tool life exponent ‘n’ in Taylor’s equation VT^n = C) (RRB Allahabad SSE 19.12.2010)

A-1, B-2, C-3, D-4
A-2, B-1, C-3, D-4
A-2, B-1, C-4, D-3
A-1, B-2, C-4, D-3

Explanation:

HSS → 0.12, Cast alloy → 0.18, Ceramic → 0.5, Sintered Carbide → 0.25.

In a machining test, a cutting speed of 100 m/min indicated the tool life as 16 min and a cutting speed of 200 m/min indicated the tool life as 4 min. The values of n and C are —-? (RRB Mumbai SSE 05.10.2008)

0.5 and 200
0.25 and 200
0.5 and 400
0.25 and 400

Explanation:

100×(16)^n = 200×(4)^n, (16/4)^n = 2, 4^n = 2, 2^(2n) = 2^1, n = 0.5. C = 100×16^0.5 = 100×4 = 400.

With increasing cutting velocity, the total time for machining a component —-? (RRB Mumbai SSE 19.12.2010)

Decreases
Increases
Remains unaffected
First decreases and then increases

Explanation:

With increase in cutting velocity, total machining time first decreases and then increases.

In Taylor’s tool life equation VT^n = C, the constants n and C depend upon —-? (DMRC JE 20.04.2018)

1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only

Explanation:

Value of C and n depends upon workpiece material, tool material, and coolant.

In a tool life test, doubling the cutting speed reduces the tool life to 1/8th of the original. The Taylor’s tool life index is —-? (RRB Kolkata Diesel JE 25.10.2009)

1/2
1/3
1/4
1/8

Explanation:

V2 = 2V1, T2 = T1/8. (T1/T2)^n = V2/V1, (8)^n = 2, 2^(3n) = 2^1, n = 1/3.

A carbide tool (having n = 0.25) with a mild steel workpiece was found to give life of 1 hour 21 minutes while cutting at 60 m/min. The value of C in Taylor’s tool life equation VT^n = C would be equal to —-? (RRB Allahabad JE 25.10.2009)

200
180
150
100

Explanation:

T = 60 + 21 = 81 minutes. C = 60 × 81^0.25 = 60 × 3 = 180.

If n = 0.5 and C = 300 for the cutting speed and the tool life relation, when cutting speed is reduced by 25%, the tool life will be increased by —-? (RRB Patna JE 25.10.2009) RRB Bangalore Material Engg, 21.11.2004

100%
95%
78%
50%

Explanation:

V1T1^0.5 = 0.75V1T2^0.5, T1/T2 = (0.75)^2, Increase = (T2-T1)/T1 × 100 = 77.77% ≈ 78%.

Using the Taylor equation VT^n = C, calculate the percentage increase in tool life when the cutting speed is reduced by 50% (n = 0.5 and C = 400). (RRB Allahabad SSE 09.09.2012)

300%
400%
100%
50%

Explanation:

V2 = 0.5V1. T1/T2 = (V2/V1)^(1/n) = (0.5)^(1/0.5) = 0.25. T2 = 4T1. Increase = (4-1)/1 × 100 = 300%.

Crater wear always starts at some distance from the tool tip because at that point —-? (RRB Bhopal SSE 09.09.2012)

Cutting fluid does not penetrate
Chip tool interface temperature is maximum
Normal stress on rake face is maximum
Tool strength is minimum

Explanation:

Crater wear occurs at 2-3 mm from cutting edge where chip-tool interface temperature is maximum.

Match the following: (RRB Jammu SSE 09.09.2012)

A-3, B-4, C-2, D-1
A-3, B-2, C-1, D-4
A-4, B-3, C-2, D-1
A-1, B-2, C-3, D-4

Explanation:

Finish turning → Nose radius, Forming → Low speed, Thread cutting → Zero rake, Down milling → Backlash eliminator.

In HSS, the tungsten can be substituted by —-? (RRB Chandigarh SSE 09.09.2012)

Chromium
Nickel
Molybdenum
Cobalt

Explanation:

In HSS, tungsten can be replaced by molybdenum. Molybdenum has effect similar to manganese and vanadium and is a strong carbide former.

What effect does the low cutting speed have on the carbide tool/workpiece? (RRB Bangalore SSE 09.09.2012)

Reduces tool life
Increases tool life
Have no effect on tool life
Spoils the work piece

Explanation:

As cutting speed decreases, tool life increases. Tool life is greatly influenced by cutting speed. VT^n = constant, so V ∝ 1/T.

On which of the following surface, flank wear occurs? (RRB Patna JE 25.10.2009)

Nose of the tool
Rake face of the tool
Relief face of the tool
Cutting edge of the tool

Explanation:

Flank wear occurs on the nose part, front relief face, and side relief face. It is caused by friction between the newly machined surface and tool flank, creating inaccuracy.

Tool life can be increased by increasing —-? (UPRVUNL JE 2016, 2.30 p.m.) (RRB Makla SSE 25.10.2009)

cutting speed
nose radius
feed
depth of cut

Explanation:

Tool life can be increased by increasing nose radius. It strengthens the tool by reducing stress concentration and produces better surface finish. Optimum range is 0.5-2.5 mm.

Which of the following should be more to reduce wear of a tool? (RRB Kolkata Diesel JE 25.10.2009) RRB Kolkata Mech. Engg., 06.02.2005

a.Weight
b.Density
c.Hardness
(b) & (c) both

Explanation:

Density and hardness of material should be more to reduce tool wear at high speed and high temperature.

In Taylor’s tool life equation, VTⁿ = C, the value of n = 0.5. The tool has a life of 180 minutes at a cutting speed of 18 m/minute. Determine the cutting speed if the tool life is reduced to 45 minutes. (Konkan Railway STA 2017)

9 m/minute
18 m/minute
36 m/minute
72 m/minute

Explanation:

18 × (180)^0.5 = V2 × (45)^0.5, V2 = 18 × √(180/45) = 18 × √4 = 18 × 2 = 36 m/min.

The cutting tool used in spark erosion machining process is called —-? (RRB Mumbai SSE 19.12.2010)

arc
capacitor
electrode
dielectric

Explanation:

In EDM (spark erosion), the cutting tool is used as an electrode. A pulsating DC power supply generates voltage pulses between electrode and workpiece, producing sparks that erode material.

Crater wear occurs due to which one of the following phenomenon? (RRB Allahabad SSE 19.12.2010)

Adhesion
Diffusion
Oxidation
All of the above

Explanation:

Crater wear occurs mainly due to diffusion. When cutting speed increases, temperature increases, diffusion increases, and crater wear increases.

In metal cutting with a carbide tool, at the maximum recommended speed, the largest % of heat generated goes to the —-? (RRB Bhubneshwar JE-II 19.12.2010)

Tool
Chip
Work
Tool post

Explanation:

In metal cutting with carbide tool at maximum recommended speed, the largest heat goes to the chip. During cutting, 90% of energy converts to heat. Heat distribution: Q_chip > Q_work > Q_tool.

Taylor’s tool life equation is as follows —-? (DMRC JE 22.09.2017) (RRB Mumbai JE 05.10.2008)

TVⁿ = C
VTⁿ = C
VTⁿ = C
VT = C

Explanation:

Taylor’s tool life equation is VTⁿ = C, where V = cutting speed, T = tool life (in minutes), n = tool life exponent, C = machining constant.