RRB JE Mechanical-Metrology Questionbank 1

Mechanical-Engineering

Which of the following is used to check the diameters of holes? RRB JE (Re-Exam) 04.06.2025

Plug gauge
Fillet gauge
Standard screw pitch gauge
Slip gauge

Explanation:

Plug gauge is a type of limit gauge used to check the diameters of holes. ‘GO’ end of plug gauge is equal to lower limit size and ‘NO GO’ end is equal to upper limit size of the job.

How many divisions are graduated on the thimble of micrometer? RRB JE (Re-Exam) 04.06.2025

Explanation:

On the thimble of micrometer, 50 divisions are graduated. Least count of metric micrometer is 0.01 mm. L.C. = Pitch/Total divisions on thimble.

Feeler gauge are used to —-? RRB JE (Re-Exam) 04.06.2025

Check and measure the bearing clearance
All of the options
Check and set the spark plug gaps
Check the gap between the mating parts

Explanation:

Feeler gauges (thickness gauges) are used to: check and measure bearing clearance, check and set spark plug gaps, and check the gap between mating parts.

The preferred instrument for measuring depth of holes, slots and recesses is —-? RRB JE 30-08-2019

Vernier depth gauge
Feeler gauge
Screw gauge
Vernier calliper

Explanation:

The preferred instrument for measuring depth of holes, slots and recesses is vernier depth gauge. L.C. of analog vernier depth gauge is 0.02 mm while digital type is 0.01 mm.

A radius gauge is also known as —-? RRB JE 31-08-2019

Fillet gauge
Snap gauge
Feeler gauge
Slip gauge

Explanation:

A radius gauge is also known as fillet gauge. It is used for measuring the radius of convexity or concavity of the job.

The term ‘grating’ in metrology means that —-? RRB JE 31-08-2019

Rulings follow a logarithmic scale
Rulings need not have any pattern
Rulings are more closely spaced, producing a periodic pattern without blank gaps
Rulings are spaced relatively far apart, requiring some type of interpolating device to make accurate settings

Explanation:

The term ‘grating’ in metrology means that rulings are more closely spaced, producing a periodic pattern without blank gaps.

Johannsen Gauges are otherwise known as —-? RRB JE 31-08-2019

Slip gauges
Radius gauges
Snap gauge
Feeler gauge

Explanation:

Johannsen gauges are also known as slip gauges. They are made of hardened steel, used to check accuracy of measuring instruments, and joined by wringing method.

For which surface, is a spirit level used for testing straightness? RRB JE 31-08-2019

Inclined surfaces
Horizontal surfaces
Both horizontal and vertical surfaces
Vertical surfaces

Explanation:

Spirit level is used to check the straightness of horizontal and vertical surfaces. When the air bubble reaches the centre, it indicates the surface is horizontal or vertical.

In a vernier calliper, the main scale reads in millimeters with a least count of 0.1 mm. Ten divisions on the vernier correspond to nine divisions of the main scale. Determine the least count of the calliper. RRB JE 31-08-2019

0.01 mm
0.001 mm
0.1 mm
1 mm

Explanation:

1 MSD = 0.1 mm, 10 VSD = 9 MSD, 1 VSD = 0.9 MSD = 0.09 mm. L.C. = 1 MSD – 1 VSD = 0.1 – 0.09 = 0.01 mm.

While taking a measurement with the help of a Micrometer, which two parts of a Micrometer are used to hold the specimen? (RRB Bhopal TM SSE 25.10.2009)

Spindle and Anvil
Spindle and Ratchet
Anvil and Ratchet
Anvil and Barrel

Explanation:

In micrometer, the workpiece is held between spindle and anvil. It works on the principle of screw and nut. Least count = 0.01 mm.

Filar microscopes —-? (RRB Allahabad SSE 09.09.2012)

have no reticles
have fixed reticles
have moving reticles
can be moved relative to the work by means of a fine-pitch lead screw

Explanation:

Filar microscopes have a reticle with two fine parallel wires that can be moved by the observer using a micrometre screw mechanism.

Which of the following is NOT an angle measuring device? (RRB Bangalore SSE 09.09.2012)

Feeler gauge
Sine bar
Bevel protractor
Combination set

Explanation:

Feeler gauges are used to measure thickness of clearance, not angles. Angle measuring devices include protractor, sine bar, sine centre, sine table, angle gauge, clinometer, and combination set.

According to Taylor’s Principle, No Go gauge checks —-? (RRB Bhopal SSE 09.09.2012) RRB Bhopal Section Engineer, 24.11.2002

only one feature at a time
only important dimensions at a time
all the dimensions at a time
only the related dimensions at a time

Explanation:

Taylor’s principle states that GO gauge should cover maximum metal condition in as many dimensions as possible, while NO GO gauges cover minimum metal condition in one dimension only.

Universal surface gauge is used for —-? (RRB Gorakhpur Design SSE 09.09.2012)

checking straightness
checking flatness
checking parallelism
layout work and inspection

Explanation:

Universal surface gauge is used for accurately scribing lines, transferring measurements, or probing surfaces in inspection work.

The two slip gauges in precision measurement are joined by —-? (RRB Bhopal SSE 09.09.2012)

Sliding
Adhesion
Wringing
Slipping

Explanation:

Two slip gauges are joined by wringing method due to molecular adhesion between a liquid film and mating surfaces.

A vernier scale is good enough to read in after decimal —-? (RRB JE Bhopal Paper-I (Shift-II), 28.08.2015) RRB Chandigarh Section Engineer, 15.03.2009

One digit
Two digits
Three digits
Four digits

Explanation:

A vernier scale is good enough to read up to two digits after decimal (0.01 mm).

Which of the following scales can be used interchangeably? (RRB SSE (Shift-II), 03.09.2015)

Comparative scales and diagonal scales
Diagonal scales and plain scales
Vernier scale and comparative scale
Diagonal scale and vernier scale

Explanation:

Diagonal scale and vernier scale can be used interchangeably as both are used to measure three consecutive units.

The following type of gauge has gauging sections combined on one end —-? (RRB Chandigarh SSE 09.09.2012)

Progressive gauge
Fixed gauge
Limit gauge
Combination gauge

Explanation:

Progressive gauge is a single ended gauge with one gauging member having diameter to GO and NO GO limits respectively.

The Vernier Calliper’s advantage over the micrometer is that —-? (RRB Jammu SSE 09.09.2012)

it can be used to make both inside and outside measurements over a range of sizes
is more accurate
is easier and quick to use
None of these

Explanation:

Vernier caliper can measure external diameter, internal diameter, and depth, while micrometer only measures external diameters. Accuracy of vernier is 0.02 mm and micrometer is 0.01 mm.

Optical micrometer is used to —-? (RRB Allahabad JE 09.09.2012)

measure small linear displacements
measure surface profiles
measure surface roughness
set very small displacement by rotating the glass block through relatively large angles

Explanation:

Optical micrometer uses shadow measurement principle and is used to measure surface profiles.

Bore diameters can be measured while working —-? (RRB Bhubneshwar JE II 29.11.2008)

steel rule
micrometer
Vernier caliper
All of these

Explanation:

Bore diameter can be measured by steel rule, micrometer, and vernier caliper.

What are dial gauges or dial test indicators used for? (DMRC JE 22.09.2017)

Measuring known angles or locating any work to a given angle
Checking flatness of surfaces and parallelism of the bars and rods
Checking the linear displacement of the tool
Checking the thickness of the chip

Explanation:

Dial gauges are used for checking flatness of surfaces and parallelism of bars and rods. Mechanism involves rack and pinion arrangement. Least count = 0.01 mm.

A master gauge is mainly used for which of the following purpose? (RRB Bhubneshwar JE-II 19.12.2010)

checking thread cutting angle
measuring internal diameters
verifying the accuracy of gauges used on shop floor
None of these

Explanation:

Master gauge is a standard or reference gauge used for checking the accuracy of inspection gauges and calibrating micrometers, comparators, or other gauging systems.

A precision gauge blocks should be measured at temperature of about —-? (RRB Allahabad SSE 19.12.2010)

20°C
22°C
18°C
16°C

Explanation:

Precision gauge blocks should be measured at temperature about 20°C.

At what standard temperature are the gauges kept in the section? (RRB Mumbai SSE 05.10.2008)

20°C
20°F
10°C
10°F

Explanation:

Gauge blocks are calibrated to be accurate at 20°C (68°F) and should be kept at this temperature when taking measurements.

Taylor’s principle is concerned with —-? (RRB Mumbai SSE 19.12.2010)

pneumatic comparators
interferometric measurements
gauging measurements
angular measurements

Explanation:

Taylor’s principle is concerned with gauging instruments. GO gauge covers maximum metal condition, NO GO gauge covers minimum metal condition in one dimension only.

Which of the following is a Mechanical Gauge? (DMRC JE 20.04.2018)

Diaphragm gauge
Dead weight pressure gauge
Bourdon tube pressure gauge
All the above

Explanation:

Mechanical gauges (secondary instruments) include diaphragm gauge, dead weight pressure gauge, and Bourdon tube pressure gauge.

The Plug gauge is used to —-? (Konkan Railway TA 2017)

Check the size and shape of holes
Measure the diameter of holes
Measure the diameter of shafts
Measure the diameters of shafts and holes

Explanation:

Plug gauge is used to check diameter of holes or internal dimension. GO plug gauge checks low limit, NO GO plug gauge checks upper limit.

A feeler gauge is used to check —-? (RRB Chandigarh SSE 25.10.2009)

Radius
Surface roughness
Screw pitch
Thickness of clearance

Explanation:

Feeler gauge is used to measure thickness of clearance. It is made from tight tolerance high carbon steel.

The gauging amplifier having the lowest precision is —-? (RRB Gorakhpur RDSO SSE 25.10.2009)

Comparators
Indicators
Test Indicators
Both Comparators and Indicators

Explanation:

Test indicators have the lowest precision and are used for layout work on surface plate or aiding in part setup during machining.

The lost motion of the spindle in micrometer screw gauge when the rotation of the thimble is changed in direction is referred to as —-? (RRB Allahabad JE 25.10.2009)

Wear
Least count
Backlash
Total error

Explanation:

The lost motion of the spindle when the rotation of the thimble is changed in direction is referred to as backlash error.

The diameter of a round bar with close tolerances is quickly measured by —-? (RRB Bhopal TM SSE 25.10.2009)

slip gauge
external micrometer
vernier caliper
snap gauge

Explanation:

Snap gauge is used to quickly measure the diameter of a round bar with close tolerance. It is a limit gauge with permanently or temporarily fixed measurement.

A ring gauge is used to measure —-? (DMRC JE 2013)

Outside diameter but not roundness
Roundness but not outside diameter
Both outside diameter and roundness
Only external threads

Explanation:

Ring gauge is used for gauging shafts and male components to measure outside diameter only.

What is the purpose of using a ratchet screw in the micrometer screw gauge? (RRB Bangalore SSE 09.09.2012)

To maintain uniform measuring pressure
To reduce wear of screw threads
Both the above
None of the above

Explanation:

Ratchet in micrometer is used for maintaining uniform pressure while measuring.

For inspection purpose ____ slip gauges are used. (RRB Gorakhpur Design SSE 09.09.2012)

1 grade
00 grade
2 grade
0 grade

Explanation:

For inspection purpose, Grade 2 slip gauges are used in workshops for rough check and ordinary inspection work.

____ is used for the accurate setting of tailstock. DMRC JE 17.04.2018 12:15-2:30 PM

Thread gauge
Slip gauge
Vernier caliper
Plug gauge

Explanation:

Slip gauges are used for accurate setting of tailstock and for accurate measurement of parts.

Which of the following can be used to scribe lines parallel to the edges of a part? (BMRCL JE 24 Feb.2019)

Vernier caliper
Screw gauge
Divider
Hermaphrodite caliper

Explanation:

Hermaphrodite caliper has one leg bent inward and one straight leg ending in a sharp point, used to scribe lines parallel to the edges of a part.

Feeler gauges are used for measuring the —-? (RRB Bhubneshwar JE-11 19.12.2010) (DMRC JE 2013)

Thickness of metal sheet
Clearances between mating parts
Pitch of screw threads
Radius of curvature

Explanation:

Feeler gauges are used for measuring clearances between mating parts.

A Feeler Gauge is used for quantifying —-? (RRB Allahabad JE 19.12.2010)

Surface Roughness
Radius
Gap
Screw Pitch

Explanation:

Feeler gauges are used for quantifying the gap between two mating parts (e.g., gap between spark plug electrodes).

A high grade set of slip gauge preserved in a factory and not put into general use would be a standard of the type —-? (RRB Allahabad SSE 19.12.2010)

international
secondary
working
primary

Explanation:

A high grade set of slip gauge preserved in a factory and not put into general use would be a working standard.

Slip gauges were invented by —-? (RRB Mumbai JE 05.10.2008)

CE Johansson
Alexander
CV Raman
Symons

Explanation:

Slip gauges were first developed by Carl Edward Johansson.

Wear allowance is provided on —-? (RRB Mumbai SSE 05.10.2008)

GO gauge
NO GO gauge
Both GO and NO GO gauge
When both are combined in one gauge

Explanation:

GO gauges constantly rub against surfaces and are subjected to wear. Wear allowance is added to GO gauge in the direction opposite to wear.

If the spindle of the micrometer does not move by rotating the thimble then the instrument is said to have —-? (RRB Mumbai SSE 19.12.2010)

zero error
positive error
backlash error
negative error

Explanation:

Backlash error occurs due to wear and tear in the screw gauge when the circular scale does not move at once when the ratchet is rotated.

Least count of a micrometer is —-? (DMRC JE 2013)

0.1 mm
0.01 mm
0.001 mm
0.0001 mm

Explanation:

Least count of a micrometer is 0.01 mm. It works on the principle of screw and nut.

Depth micrometer is a special micrometer used to measure —-? (Konkan Railway TA 2017)

the depth of holes
the depth of grooves and recesses
the height of shoulders or projections
all of these

Explanation:

Depth micrometer is used to measure the depth of holes, grooves, recesses, and height of shoulders or projections with precision of 0.01 mm.

In an outside micrometer ____ turns open the anvils by exactly 1.00 mm. (Konkan Railway SSE 2015)

half
one
two
one and half

Explanation:

In an outside micrometer, two turns open the anvils by exactly 1.00 mm.

Circular scale on micrometer is marked on —-? (RRB Kolkata Diesel JE 25.10.2009)

Anvil
Barrel
Thimble
Ratchet

Explanation:

Circular scale on micrometer is marked on the thimble. Spindle moves linearly and workpiece is held between anvil and spindle.

Which of the following is not a part of a micrometer? (RRB Chandigarh SSE 25.10.2009)

Anvil
Thimble
Sleeve
None of these

Explanation:

All the given options (anvil, thimble, sleeve) are parts of a micrometer.

Which one of the following is NOT a part of a Vernier Calliper? (RRB Mumbai C&G JE 25.10.2009)

Depth measuring blade
Beam
Ratchet
Locking screw

Explanation:

Ratchet is not a part of vernier caliper. It is a part of micrometer.

Which of the following can be used to scribe lines parallel to the edges of part? (RRB Gorakhpur RDSO SSE 25.10.2009)

Vernier calipers
Screw gauge
Divider
Hermaphrodite

Explanation:

Hermaphrodite caliper is used to scribe lines parallel to the edges of a part and to locate the center of cylindrical workpieces.

Gear tooth Vernier is used —-? (RRB Jammu JE 25.10.2009)

to measure the addendum
to measure the addendum and dedendum
to measure the circular pitch
to measure the pitch line thickness of tooth

Explanation:

Gear tooth vernier is used for measuring the chordal thickness of a gear tooth at the pitch circle. It has horizontal and vertical vernier calipers.

The following gauge is used for checking of holes —-? (RRB Malda SSE 25.10.2009)

ring gauge
snap gauge
dial gauge
plug gauge

Explanation:

Plug gauge is used to check holes or internal dimensions. Snap and ring gauges are used for shafts or external dimensions.

What is the accuracy of the universal bevel protractor? RRB JE (Re-Exam) 04.06.2025

12-minute (12′)
15-minute (15′)
8-minute (8′)
5-minute (5′)

Explanation:

The accuracy of the universal bevel protractor is 5 minutes (5′) i.e., 1/12°. It is used for measuring acute as well as obtuse angles.

What is the maximum angle that can be generally set using a sine bar? RRB JE (Re-Exam) 04.06.2025

60°
90°
75°
45°

Explanation:

The maximum angle that can be generally set using a sine bar is 45°. It is not recommended for angles greater than 45° because any error gets accentuated.

Which of the following can be used for angular measurements? RRB JE (Re-Exam) 04.06.2025

Slip Gauge
Micrometer
Autocollimator
Depth Gauge

Explanation:

Autocollimator is an optical instrument used to measure small angles with very high sensitivity for precision alignment, detection of angular movement, and verification of angle standards.

If 30 m is the height difference between the two rollers and 60 m is the distance between the centres of the rollers, what is the angle formed between the upper surface of a sine bar and the surface plate (datum)? RRB JE (Re-Exam) 04.06.2025

45°
90°
60°
30°

Explanation:

sin θ = H/L = 30/60 = 1/2, θ = 30°.

What is the number of divisions on the vernier scale of a Universal Bevel Protractor? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

Explanation:

The number of divisions on the vernier scale of a universal bevel protractor is 24.

Which of the following is NOT an angular measurement device? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

Sine Bar
Digital Micrometer
Autocollimator
Spirit Level

Explanation:

Digital micrometer is a precision measuring instrument for dimensions (thickness or diameter), not for angular measurement.

The key step in making a dimensional measurement using a tool maker’s microscope is —-? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

vicing the magnified image
adjusting the focus on the work piece
aligning the cross-wires with the measurement points
changing the objective lens power

Explanation:

A tool maker’s microscope is used for precise linear and angular measurements of small parts. The key step is aligning the cross-wires with the measurement points.

Which of the following hardness scales uses a diamond cone indenter? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

Rockwell C scale
Brinell scale
Mohs scale
Vickers scale

Explanation:

Rockwell C scale uses a diamond cone indenter with 120° angle and applies a major load of 150 kg to measure hardness of hard materials like steel.

Which of the following is a special case of a spirit-level device? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

Micrometer
Clinometer
Autocollimator
Kelvinometer

Explanation:

A clinometer is a device used to measure inclination or elevation with respect to gravity. It uses the principle of spirit level to determine angular displacement.

Angle gauges are generally made from which material? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

Carbon fibre
Hardened steel
Wood
Plastic

Explanation:

Angle gauges (angle blocks or angle plates) are precision tools made from hardened steel used to measure and verify angles.

Which of the following is NOT a function of the spirit level measuring instrument? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

For determining flatness and straightness
For measuring surface roughness
For measuring alignment of machine parts
For measuring angles

Explanation:

Spirit level is used for determining flatness/straightness, alignment, and angles. It is not used for measuring surface roughness.

What is the angle between the two surfaces of an angle plate? RRB JE 29-08-2019

120°
45°
90°
180°

Explanation:

The angle between the two surfaces of an angle plate is 90°. It is generally made of cast iron and used for holding work in combination with a face plate.

Where does the bubble rest on the scale when spirit level is placed horizontally? RRB JE 29-08-2019

Centre
Left most
Right most
Bottom

Explanation:

When spirit level is placed horizontally, the bubble rests at the centre on the scale.

A 5.00″ sine bar is elevated to 2.50″. What angle is established? RRB JE 30-08-2019

90°
45°
30°
60°

Explanation:

H = 5.00″, L = 2.50″. sin θ = H/L = 2.50/5.00 = 0.5, θ = 30°.

Which of the following statements is true? RRB JE 30-08-2019

An angle dekor is a small variation of an autocollimator
An angle dekor is a small variation of a bevel protractor
An angle dekor is a small variation of a clinometer
An angle dekor is a small variation of a sine bar

Explanation:

An angle dekor is a small variation of an autocollimator used as a comparator to measure change in angular position of the reflector in two planes.

The maximum angle that can be set using a sine bar is limited to —-? RRB JE 30-08-2019

60°
15°
30°
45°

Explanation:

Sine bars become impractical and inaccurate as the angle exceeds 45° because even a slight error can cause large angular errors.

Determine the elevation for 30° using 5.00″ sine bar. RRB JE 31-08-2019

2.5000″
3.8302″
2.8679″
1.7101″

Explanation:

h = l × sin θ = 5.00 × sin 30° = 5.00 × 0.5 = 2.5000″.

Which of the following is NOT an angular measuring instrument? RRB JE 31-08-2019

Autocollimator
Sine bar
Micrometer
Bevel Protractor

Explanation:

Micrometer is a linear measuring instrument used to measure width, thickness, diameter, etc. Autocollimator, sine bar, and bevel protractor are angular measuring instruments.

The combination set can be used to —-? (RRB Allahabad JE 25.10.2009)

Check angular surface
Draw circles and arcs
Scribes lines
None of them

Explanation:

Combination set can be used for layout work, measurement, and checking of angles. It has centre head, steel rule, protractor head, and square head.

Accuracy of setting a sine bar —-? (RRB Mumbai C&G SSE 25.10.2009)

is poor for smaller angles
is maximum when angle of measurement is 45°
decreases appreciably with steep angle
is dependent on accuracy of outer dimensions of sine bar

Explanation:

Accuracy of setting a sine bar decreases appreciably with steep angle. Maximum angle accurately measurable is 45°.

External taper can be accurately measured with the help of —-? (RRB Patna JE 25.10.2009)

sine bar and slip gauges
dividing head
height gauge
clinometer

Explanation:

External taper can be accurately measured with the help of sine bar and slip gauges using sine centres.

Which of the following considered as a slip gauges grades? (RRB Bhopal TM SSE 25.10.2009) RRB Chennai Section Engineer, 12.02.2012

Reference grade
Calibration grade
0, 1, II grades
All of the above

Explanation:

Grades of slip gauges include Reference grade, Calibration grade, and Grades 0, I, II.

Process of wringing in slip gauge is due to —-? (RRB Allahabad SSE 09.09.2012)

Molecular cohesion
Molecular adhesion
Air friction
Air vacuum

Explanation:

Wringing occurs due to molecular adhesion between a liquid film and mating surfaces.

Angle slip gauge measures angle more accurate than —-? (RRB Bangalore SSE 09.09.2012)

sine bar
Optical flat
Auto-collimeter
None of these

Explanation:

Angle gauges are more accurate than sine bar for measuring angles. They can measure any angle between 0° and 360° with accuracy of 0.5 to 0.25 seconds.

The working principle of sine bar is —-? (RRB Kolkata SSE 09.09.2012)

Trigonometry
Optimetry
Interferometry
Algebraic

Explanation:

Sine bar works on the principle of trigonometry: sin θ = h/l (height of slip gauges / length of sine bar).

Which one of the following is an angle measuring device? (RRB Gorakhpur Design SSE 09.09.2012)

Trammel
Hermaphrodite caliper
Divider
Sine bar

Explanation:

Sine bar is an angle measuring device. Others include vernier bevel protractor, sine centres, sine tables, angle gauges, spirit level, clinometers, and autocollimator.

____ can measure an angle accurately upto 1/60th part of a degree. (RRB Bhopal SSE 09.09.2012)

Angle gauge
Slip gauge
Combination set
Sine bar

Explanation:

Sine bar can measure an angle accurately up to 1/60th part of a degree.

Sine bars should not be used for angle greater than ____ degree. (RRB Chandigarh SSE 09.09.2012)

Explanation:

Sine bars should not be used for angles greater than 60°.

Which of the following is not the essential requirement for accuracy of measurement with a sine bar? (RRB Jammu SSE 09.09.2012)

Flatness of upper surface
Exact distance between roller axes and mutual parallelism
Parallelism between top and bottom surfaces
Parallelism of rollers to upper surface and equality of axis distance as from surface

Explanation:

Essential requirements: flatness of upper surface, rollers of equal diameter and true cylinder, accurate distance between roller axes.

A sensitive angle measuring device is —-? (RRB Allahabad JE 09.09.2012)

Clinometer
Comparator
Micrometer
Interferometer

Explanation:

Clinometer is a sensitive angle measuring device and a special case of spirit level used for much larger angles.

The angle gauges are available in sets, how many gauges are available in B set? (RRB Bhubneshwar JE II 29.11.2008)

16 gauges
13 gauges
15 gauges
10 gauges

Explanation:

B set has 13 gauges with accuracy of 3″. A set has 16 gauges with accuracy of 1″.

In Bevel gauges, length of the blades is about —-? (DMRC JE 22.09.2017)

50-75 mm
75-100 mm
150-200 mm
100-150 mm

Explanation:

Bevel gauges (sliding bevel or false square) have blade length of 75-100 mm.

The instrument which has all the features of try-square, bevel protractor, rule and scriber, is called —-? (JMRC JE 10.06.2017)

outside micrometer
depth gauge micrometer
vernier caliper
combination set

Explanation:

Combination set has all features of try-square, bevel protractor, rule, and scriber. It is made of alloy steel.

____ is an instrument used for angular measurement. (RRB Bhubneshwar JE-II 19.12.2010)

Dial gauge
Vernier caliper
Micrometer
Clinometer

Explanation:

Clinometer is an instrument used for angular measurement.

Sine bar specification can be expressed in —-? (RRB Allahabad SSE 19.12.2010) (UPRVNL JE, 09.11.2016)

centre distance between the two rollers and size of rollers
its total length
weight of sine bar
length and width of rollers

Explanation:

Sine bar specification is expressed in centre distance between the two rollers and size of rollers.

Which of the following back pressure gauges is NOT used in Pneumatic Comparators? RRB JE (Re-Exam) 04.06.2025

Differential back pressure gauge
Venturi back pressure gauge
Water column back pressure gauge
Absolute back pressure gauge

Explanation:

Absolute back pressure gauge is not used in pneumatic comparators. Differential, venturi, and water-column back pressure gauges are parts of pneumatic comparators.

Which of the following is NOT a feature of pneumatic comparators? RRB JE (Re-Exam) 04.06.2025

No wearing of parts
High range of amplification
Non-contact inspection of work parts
Presence of hysteresis

Explanation:

Presence of hysteresis is not a feature of pneumatic comparators. They have no wearing of parts, high range of amplification, and non-contact inspection.

What is the complete form of ‘LVDT’, one of the most popular electromechanical comparators? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

Linear versatile differential transformer
Longitudinal variable differential transformer
Linear variable dimensional transformer
Linear variable differential transformer

Explanation:

LVDT stands for Linear Variable Differential Transformer, a popular electromechanical comparator.

Which comparator is generally used to measure small displacement of spindles? RRB JE 29-08-2019

Optical comparators
Reed type comparator
Sigma comparator
Electric comparators

Explanation:

Reed type comparator is generally used to measure small displacement of spindles up to 0.002 mm with accuracy.

The Johanson mikrokator is a type of —-? RRB JE 30-08-2019

Mechanical optical comparator
Mechanical comparator
Optical comparator
Electronic comparator

Explanation:

The Johanson mikrokator is a type of mechanical comparator using the principle of helical or twisted strip.

Sigma comparator is a type of comparator —-? RRB JE 31-08-2019

Optical
Electrical
Mechanical
Electronic

Explanation:

Sigma comparator is a type of mechanical comparator with magnification range from 300 to 500. It does not require power supply.

Which of the following not correct for comparators applications? (RRB Mumbai SSE 05.10.2008)

Laboratory standards
Working gauge
Final inspection gauge
Measuring angles

Explanation:

Comparators are not used for measuring angles. They are used as laboratory standards, working gauges, and final inspection gauges.