RRB JE Mechanical-Grinding Questionbank 2

Mechanical-Engineering

Which of the following operations cannot be performed in grinding machine? (RRB Allahabad JE 25.10.2009)

Surface Grinding
Cylindrical Grinding
Internal Grinding
None of these

Explanation:

Operations that can be performed on grinding machine include surface grinding, cylindrical grinding, centreless grinding, internal grinding, form grinding, and wet & dry grinding.

In production engineering, gear hobbing is a —-? RRB JE (Re-Exam) 04.06.2025

surface finishing process
primary shaping process
joining process
machining process

Explanation:

Gear hobbing is a continuous generating machining process where tooth flanks of the constantly moving workpiece are formed by equally spaced cutting edges of the hob. It produces spur, helical, worm wheels, serrations, splines, etc.

Which of the following processes produces the minimum surface roughness on workpieces? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

Superfinishing
Grinding
Lapping
Honing

Explanation:

Superfinishing is specifically designed to achieve extremely smooth surfaces with very low roughness values, making it the best choice for minimal surface roughness.

The process of enlarging the holes of accurate sizes is called —-? RRB JE 29-08-2019

Drilling
Reaming
Knurling
Counter boring

Explanation:

Reaming is the process of enlarging holes to accurate sizes. The rotary cutting tool used is known as a reamer, which is a multi-point cutting tool.

Which of the following teeth does a broach have? RRB JE 30-08-2019

Semi finishing teeth
All of the options
Roughing teeth
Finishing teeth

Explanation:

A broach has three cutting teeth zones: roughing teeth, semi-finishing teeth, and finishing teeth. Roughing and finishing cuts are completed in one pass of the tool.

In machine lapping, for hard materials, a pressure up to ____ is applied. RRB JE 31-08-2019

1 N/mm²
0.02 N/mm²
0.05 N/mm²
0.5 N/mm²

Explanation:

Lapping pressure: For soft material – up to 0.02 N/mm², For hard material – 0.5 N/mm².

Generally, the material of the lap should be ____ material. (RRB Mumbai C&G SSE 25.10.2009)

Greater than the workpiece
Softer than the workpiece
Equal to the workpiece
Very harder than the workpiece

Explanation:

In lapping process, small amounts of material are removed by rubbing the work against a lap charged with lapping compound. The lap material should be softer than the workpiece.

Honing stone or hone is made of —-? (RRB Kolkata SSE 09.09.2012)

Bonded abrasives
Diamond
Silicon Carbide
Aluminium Oxide

Explanation:

Hone is a tool used for honing process, made up of bonded abrasive stone made in form of sticks. The tool moves back and forth while rotating about its axis.

What is lapping used for? (RRB Gorakhpur Design SSE 09.09.2012)

To drill a hole
To smoothen the edges of the work piece
To reduce the chip thickness
To obtain truly flat and smooth surface

Explanation:

Lapping is a super finishing process used to create flat surfaces. It is the oldest method to obtain extreme dimensional accurate surfaces. Very thin layers of metal (0.005 to 0.01 mm) are removed.

Honing process gives surface finish of what order? (UPPSC JE Irrigation 2005) (RRB Bhopal SSE 09.09.2012)

10 μm (CLA)
1.0 μm (CLA)
0.1 μm (CLA)
0.01 μm (CLA)

Explanation:

Honing is a cutting process with bonded grain used to improve form, dimensional precision, and surface quality. It gives surface finish of 0.01 μm (CLA).

The amount of stock which can be removed by honing is —-? (RRB Chandigarh SSE 09.09.2012)

0.75 mm
0.05 mm
0.02 mm
0.015 mm

Explanation:

Honing is a superfinishing process used for previously machined surfaces. It removes material less than 0.25 mm but sometimes can remove stock up to 3 mm.

The final finishing process for the surface plate made of cast iron which is used as a reference surface is —-? (RRB Jammu SSE 09.09.2012)

Buffing
Grinding
Hand scraping
Honing

Explanation:

Buffing is a surface finishing process performed after polishing for providing high luster. It removes very little material and does not maintain flatness or roundness, but is used to obtain very smooth reflective surface.

Buffing wheels are made of —-? (UPPSC JE Irrigation 2005) (RRB Allahabad JE 09.09.2012)

Softer metals
Carbon
Cotton fabric
Graphite

Explanation:

Buffing wheels are generally made of cotton fabric.

Which of the following is basically a polishing operation? (RRB Bhubneshwar JE II 29.11.2008)

Soft grinding
Lapping
Honing
Buffing

Explanation:

Buffing is similar to polishing, with the exception that very fine abrasive is used on soft disks made of cloth or hide.

Buffing process is used —-? (UPPSC JE Irrigation 2005) (RRB Bhubneshwar JE-II 19.12.2010)

To achieve flatness
To achieve roundness
To improve surface finish
To obtain very smooth reflective surface

Explanation:

Buffing process is performed after polishing to obtain a very smooth reflective surface.

Which of the following pigments provide anti-corrosion characteristics in the organic coating? RRB JE (Re-Exam) 04.06.2025

Zinc phosphate
Barium metaborate
Lithopone
Limestone

Explanation:

Zinc phosphate pigments provide anti-corrosion characteristics in organic coating due to their ability to form a protective layer on metal surface, inhibiting corrosion.

Which of the following statements is correct regarding electroplating? RRB JE (Re-Exam) 04.06.2025

The rate of anodic dissolution is found greater to the rate of deposition of metal onto the substrate
The dissolution of metal starts at the cathode
The rate of anodic dissolution is found equal to the rate of deposition of metal onto the substrate
The metal is deposited on the anode

Explanation:

In electroplating, the rate of anodic dissolution is equal to the rate of deposition of metal onto the substrate. Electroplating is also known as electro-deposition.

Which of the following components generally evaporate in the organic coating? RRB JE (Re-Exam) 04.06.2025

Additives
Pigments
Binder
Solvents

Explanation:

Solvents generally evaporate in organic coating. They are volatile components included in a large majority of coatings.

Electroplating is also known as —-? (DMRC JE 20.04.2018)

Electro filling process
Electro chemical plating
Electro grinding
Metal deposition

Explanation:

Electroplating is also called electro chemical plating. The part to be coated acts as the cathode (negative electrode) of an electrolytic cell.

Working principle of Electroplating process is based on —-? (Konkan Railway SSE 2015)

Newton’s law
Ohm’s law
Faraday’s law
Kirchoff’s law

Explanation:

Working principle of electroplating is based on Faraday’s law: Amount of metal deposited is proportional to the quantity of electricity passed through the electrolyte. V = KIt.

Hot dipping is a process in which —-? (RRB Chandigarh SSE 25.10.2009)

Electro filling
Electro chemical plating
a metal is immersed in a molten bath of another metal
Metal spraying

Explanation:

Hot dipping is the process in which metal is immersed in a molten bath of another metal. A metallurgical reaction (diffusion process) occurs between them, forming uniform coating thickness.

Working principle of hot dipping is —-? (RRB Gorakhpur RDSO SSE 25.10.2009)

Electro filling process
Forming transition layers
Electro grinding
Metal spraying

Explanation:

Hot dipping works on the principle of forming transition layers. It is used for coating low melting point metals (Pb, Sn, Zn) on iron, steel, and copper.

Galvanizing process is a —-? (RRB Malda SSE 25.10.2009)

Electro chemical plating
Electro plating
(a) and (b) both
None of the above

Explanation:

Galvanizing is the process of electroplating or electro chemical plating. It involves coating iron or steel with zinc by immersing in molten zinc at around 450°C.

Which of the following galvanizing process used for intricate shapes? (RRB Mumbai C&G SSE 25.10.2009)

Hot dip galvanizing
Flow galvanizing
Sherardizing
Electroplating galvanizing

Explanation:

Sherardizing is used for intricate shapes. It is a zinc diffusion based thermochemical coating process using zinc vapor to form zinc-iron layers on steel parts.

Anodizing is an ____ process? (RRB Mumbai JE 05.10.2008)

Oxidising
Oxidising
Reducing
None of these

Explanation:

Anodizing is an electrolytic process used to increase the thickness of natural oxide layer on metal parts. It is an oxidising process used for aluminium and magnesium articles.

Which of the following is generally used for melting metal in the metallic gun type of metal spraying process? RRB JE (Re-Exam) 04.06.2025

Compressed air
Plasma torch
Oxy acetylene flame
Electric arc

Explanation:

Oxy-acetylene flame is generally used for melting metal in metallic gun type of metal spraying due to its ability to generate high temperatures needed to melt the metal.

Metal spraying also known as —-? (RRB Mumbai JE 19.12.2010)

Spray stabilizing
Spray metallizing
Spray anodizing
None of these

Explanation:

Metal spraying is also called spray metallizing. It involves impregnating a base material with a metal or metal compound by spraying the coating metal to the surface.

Metal used for deposition in metal spraying form is —-? (DMRC JE 2013)

Wire or powder
Molten metal
(a) and (b) both
None of the above

Explanation:

Metal spraying uses either wire or powder form for deposition. Both forms are used in the process.

Spray gun used in —-? (Konkan Railway STA 2017)

Wire spraying
Metal spraying
Electro plating
Hot dipping

Explanation:

Spray gun is used in wire spraying, where two consumable metal wires are fed independently into the spray gun.

In wire spraying metal feed in spray gun in the form of —-? (RRB Kolkata Diesel JE 25.10.2009)

Powder
Rod
Wire
Molten metal

Explanation:

In wire spraying, metal is fed in the form of wire. Two consumable metal wires are fed independently into the spray gun.

Powder spraying process also known as —-? (RRB Gorakhpur RDSO SSE 25.10.2009)

Wire spraying
Metal spraying
Powder metallizing
Electro less plating

Explanation:

Powder spraying process is also known as powder metallizing.

Which of the following is powder spraying technique? (RRB Malda SSE 25.10.2009)

Plasma spraying
Centrifugal spraying
(a) and (b) both
None of these

Explanation:

Plasma spraying is a powder spraying technique.

Powder process also known as —-? (RRB Mumbai C&G SSE 25.10.2009)

Powder coating
Centrifugal spraying
(a) and (b) both
None of these

Explanation:

Powder process is also known as powder coating. It is applied as a free-flowing dry powder, typically electrostatically and then cured with heat or UV light.

Plasma gun made of —-? (RRB Bhopal TM SSE 25.10.2009)

Copper
Steel
Chromium
Aluminium

Explanation:

Plasma gun is made of copper.

Plasma coating preferred for which metals? (RRB Bangalore SSE 09.09.2012)

Titanium
Chromium
Carbides
All of the above

Explanation:

Plasma coatings are preferred for titanium, chromium, and carbides. Plasma spray coating creates a hard coating that protects against oxidation and corrosion.

An example of anodic coating is —-? (RRB Gorakhpur Design SSE 09.09.2012)

Zinc
Copper
Nickel
Chromium

Explanation:

Anodic coating metals are anodic to the base metal. Zinc, aluminium, and cadmium are examples of anodic coatings. Cathodic coatings include Cu, Ag, Ni, etc.

The method of immersing a material into a molten bath for coating is known as —-? (RRB Chandigarh SSE 09.09.2012)

Electroplating
Hot dipping
Cladding
Cementation

Explanation:

Hot dipping is the process of immersing a material into a molten bath of another metal. A metallurgical reaction (diffusion process) occurs forming uniform thickness.

Which of these methods uses a filler wire at a high-temperature flame? (RRB Allahabad JE 09.09.2012)

Hot dipping
Metal spraying
Vapour plating
Cementation

Explanation:

Metal spraying uses a filler wire at high-temperature flame. It is a process for covering a surface with a metallic coating using a spray of molten particles.

Which common application do anodizing and galvanizing serve? (RRB Bhubneshwar JE II 29.11.2008)

Corrosion resistance
Improved surface
Zinc coating
Increased strength

Explanation:

Both anodizing and galvanizing processes are carried out to improve corrosion resistance of materials. Anodizing improves surface for painting, while galvanizing applies zinc coating.

Which of the following is used in organic coating as catalysts that speed up the cure reaction? RRB JE Stage 2 (22.04.2025 9:00 AM-11:00 AM)

Plasticisers
Cure additives
Colloidal stabilisers
UV stabilisers

Explanation:

Cure additives act as catalysts that accelerate the curing (hardening) process of organic coating, triggered by heat, UV light, or chemical reactions.

Which of the following are used to improve pigment dispersion and the stability of coatings during organic coating? RRB JE Stage 2 (22.04.2025 2:30-4:30 PM)

Plasticisers
Cure additives
Pigment analyser
Colloidal stabilisers

Explanation:

Colloidal stabilizers are added to enhance pigment dispersion by preventing particles from aggregating in organic coatings.

Non-metallic coating known as —-? (DMRC JE 22.09.2017)

Organic coating
Electro plating
Hot dipping
Parkrising

Explanation:

Non-metallic coatings are further classified as inorganic coating and organic coating. Organic coatings are inert organic thin barriers applied for corrosion protection and decoration.

The most important quality of any lubricant is —-? (RRB Patna JE 25.10.2009)

Grade
Specific gravity
Viscosity
Specific heat

Explanation:

The most important quality of any lubricant is viscosity. Qualities include high boiling point, low freezing point, high viscosity index, thermal stability, corrosion prevention, and high resistance to oxidation.

Which of the following coating has a glass composition? (BMRCL JE 24 Feb. 2019)

Paint
Galvanized
Enamel
Anodized

Explanation:

Enamel coating has a glass composition. It is a glassy, vitreous, usually opaque substance used in protective or decorative coating on metal, glass, or ceramic ware.

Which of the following is not a type of protective coating? (RRB Bhubneshwar JE II 19.12.2010)

Metallic
Non-metallic
Organic
Inorganic

Explanation:

Non-metallic coating is not a type of protective coating. Protective coatings include metallic, organic, and inorganic coatings.

The best example for semiliquid lubricant is —-? (DMRC JE 22.09.2017)

Lard oil
Graphite
Grease
Castor oil

Explanation:

Grease is the best example for semiliquid lubricant. They are most commonly used with higher viscosity than oils, employed for slow and heavy pressure operations.

Which method uses the powdered form of a coating to form the protective layer? (RRB Mumbai JE 19.12.2010)

Electroplating
Hot dipping
Vapour plating
Cementation

Explanation:

Cementation process uses powdered form of coating to form the protective layer. It is the hardening of cement during construction.

The mixture of oil and a pigment is known as —-? (RRB Bhubneshwar JE-11 19.12.2010)

Varnish
Paint
Lacquer
Enamel

Explanation:

The mixture of oil and pigment is known as paint. Paint is a form of organic coating applied to protect against corrosion and beautify surfaces.

A varnish is a mixture of ____ and oil. (RRB Mumbai JE 05.10.2008)

Resin
Pigment
Turpentine
Soyabean

Explanation:

Most varnishes are a blend of resin, drying oil, drier, and volatile solvent. When varnish dries, solvent evaporates and remaining constituents form a durable transparent film.

A mixture of oil and pigment in water is known as —-? (RRB Mumbai SSE 19.12.2010)

Enamel
Emulsion
Shellac
Lacquer

Explanation:

An emulsion is a suspension of particles of drying oil and pigment in water. It is an organic type of protective coating where water evaporates and mixture forms the film.

Which organic coating is made from Lac dissolved in alcohol? (RRB Bhopal SSE 09.09.2012)

Lacquer
Shellac
Emulsion
Enamel

Explanation:

Shellac is an organic coating made from Lac dissolved in alcohol. It usually dries by evaporation of the solvent. Lacquers contain nitrocellulose dissolved in solvent.

Organic coatings are complex mixtures of chemical substances are —-? (RRB Allahabad JE 19.12.2010)

Binder and Additives
Volatile components
Pigments
All of the above

Explanation:

Organic coatings are complex mixtures of chemical substances including binder, additives, volatile components, and pigments.

Volatile components are included in a large majority of coatings and are often referred to as —-? (RRB Mumbai C&G SSE 25.10.2009)

Additives
Solvents
Binders
Pigments

Explanation:

Volatile components in coatings are often referred to as solvents.

There are some important types of coatings that contain little or no pigment, commonly called —-? (RRB Gorakhpur RDSO SSE 25.10.2009)

Clear coats
Clears
Both (a) and (b)
None of these

Explanation:

Coatings that contain little or no pigment are commonly called clear coats or clears.

Oil based paint are made with —-? (Konkan Railway STA 2017)

Either alkyd or linseed
Monomers or oligomers
Polymers
None of these

Explanation:

Oil based paints are made with either alkyd or linseed oil. Oil paint consists of pigment particles suspended in a drying oil, commonly linseed oil.

In oil-based paint contains oil as a base —-? (Konkan Railway TA 2017)

Natural oil
Synthetic oil
Linseed or alkyd oil
All of these

Explanation:

Oil based paints contain either natural oils like linseed oil or synthetic oil. They consist of pigment and resin in a solvent thinner.

Which of the following disadvantage of oil-based paint? (Konkan Railway SSE 2015) RRB Kolkata Engg. (P. Way), 26.02.2000

It is very hard to clean up after painting
It needs a solvent for thinning paint during use
Contains high volatile organic compound and takes a long time to dry
All of these

Explanation:

Disadvantages of oil-based paint include difficulty in cleanup, need for solvent for thinning, high VOC content, and long drying time.