Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 60 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following photographic papers is used in sulphur printing technique?
A. Bronze bromide paper
B. Copper bromide paper
C. Silver bromide paper
D. None of the above
Answer» D. None of the above
Discussion
2.

What is meant by recalescence in cooling curves?
A. Time required for liquefying solid components
B. Time required for completely solidifying the casted components
C. The cooling curve formed due to latent heat of fission
D. Liberated heat increases temperature of an under cooled liquid metal during nucleation
Answer» E.
Discussion
3.

Austenite phase in Iron-Carbon equilibrium diagram _______
A. is face centered cubic structure
B. has magnetic phase
C. exists below 727 °C
D. all of the above
Answer» B. has magnetic phase
Discussion
4.

The study of metallographic includes ____
A. alloy constituents
B. failure analysis
C. metal structure
D. all of the above
Answer» E.
Discussion
5.

Which of the following phases has a complex orthorhomic crystal structure?
A. δ-ferrite
B. α-ferrite
C. Austenite
D. Cementite
Answer» E.
Discussion
6.

In Iron-Carbon equilibrium diagram, at which temperature cementite changes from ferromagnetic to paramagnetic character?
A. 190 °C
B. 210 °C
C. 276 °C
D. None of the above
Answer» C. 276 °C
Discussion
7.

The cooling curve formed when a material is solidified due to latent heat of fusion is called as ______.
A. Undercooling
B. Solidification
C. Thermal arrest
D. Thermometry
Answer» D. Thermometry
Discussion
8.

In metallography, microscopic method provides information about _____
A. impurities in a metal
B. location and extent of segregation
C. uniformity of structure
D. all of the above
Answer» B. location and extent of segregation
Discussion
9.

In microscopy, which illumination parameter is used for producing images with dark non-flat structure and bright back ground?
A. Bright field illumination
B. Dark field illumination
C. Both a. and b.
D. None of the above
Answer» B. Dark field illumination
Discussion
10.

What is the crystal structure of δ-ferrite?
A. Body centered cubic structure
B. Face centered cubic structure
C. Orthorhomic crystal structure
D. None of the above
Answer» B. Face centered cubic structure
Discussion
11.

Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion?
A. Martempering
B. Marquenching
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
12.

Which of the following methods measure hardenability of a metal?
A. Brinell hardness method
B. Gross Man's method
C. Rockwell hardness method
D. All of the above
Answer» C. Rockwell hardness method
Discussion
13.

Which of the following factors increases hardenability of a metal?
A. Alloying elements
B. Fine grain size
C. Very high carbon content in steel
D. All of the above
Answer» B. Fine grain size
Discussion
14.

Which carburising method has high production rate?
A. Pack carburising
B. Liquid carburising
C. Gas carburising
D. All of the above
Answer» D. All of the above
Discussion
15.

The intergranular corrosion can be prevented using ______
A. stabilized grade of stainless steel containing titanium and niobium as an alloying element
B. low carbon grade of stainless steel
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
16.

The rule used to determine composition of various phases in a phase diagram is _____
A. Gibb's phase rule
B. Lever rule
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
17.

Which of the following statements is/are false for heat treatment processes?
A. Martempering process is designed to overcome limitations of quenching
B. Pearlite is obtained as the final phase in martempering process
C. Water is used as quenching medium in Jominy end quench test
D. All of the above
Answer» C. Water is used as quenching medium in Jominy end quench test
Discussion
18.

Which of the following is the last phase obtained after completing heat treatment cycle in patenting process?
A. Bainite
B. Martensite
C. Pearlite
D. None of the above
Answer» D. None of the above
Discussion
19.

Which element precipitates at the grain boundaries, when austenitic stainless steel is heated at 900 °C?
A. Aluminium carbide
B. Chromium carbide
C. Magnesium carbide
D. Molybdenum carbide
Answer» C. Magnesium carbide
Discussion
20.

Knife Line Attack is a type of _______
A. bimetal corrosion
B. intergranular corrosion
C. localized corrosion
D. uniform corrosion
Answer» C. localized corrosion
Discussion
21.

The process of lowering the temperature of a liquid below its freezing point is known as _____
A. supercooling
B. undercooling
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
22.

Which of the following is an etching reagent used for carbon steels?
A. Nitric acid
B. Picric acid
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
23.

What is the effect of silicon on the structure of cast iron? 1. Blowholes are present in the castings 2. Increases fluidity 3. Influences the solidification of liquid alloys 4. Reacts with iron to form iron sulphide
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. All of the above
Answer» C. 3 and 4
Discussion
24.

What is meant by corrosion?
A. Chemical reaction between anode, cathode and electrolyte, which leads to loss of metal
B. Deterioration of metals due to reaction with its environment
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
25.

The process of decomposing martensitic structure, by heating martensitic steel below its critical temperature is called as _______
A. Austenitizing
B. Quenching
C. Tempering
D. None of the above
Answer» D. None of the above
Discussion
26.

Eutectoid steel contains _____
A. 0.4 % Carbon
B. 0.8 % Carbon
C. 1.2 % Carbon
D. 2.2 % Carbon
Answer» C. 1.2 % Carbon
Discussion
27.

Which transformation starts after the nucleation of ferrite phase?
A. Bainite transformation
B. Pearlite transformation
C. Both a. and b.
D. None of the above
Answer» B. Pearlite transformation
Discussion
28.

The mixture of α-ferrite and cementite is called as _______
A. Ledeburite
B. Pearlite
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
29.

Which of the following parameters is/are false for steel?
A. High carbon content
B. High melting point
C. Low damping capacity
D. None of the above
Answer» B. High melting point
Discussion
30.

Which type of chemical reaction is observed at cathode, in electrochemical corrosion?
A. Oxidation reaction
B. Peretectic reaction
C. Reduction reaction
D. None of the above
Answer» D. None of the above
Discussion
31.

In mottled cast iron, slow cooling rate is used to obtain ______
A. white cast iron
B. gray cast iron
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
32.

Which of the following is α – β brass?
A. Admiralty brass
B. Brazing brass
C. Cartridge brass
D. All of the above
Answer» C. Cartridge brass
Discussion
33.

Which of the following corrosions are caused due to velocity of fluid flow in pipes?
A. Bimetal corrosion
B. Cavitation corrosion
C. Galvanic corrosion
D. Intergranular corrosion
Answer» C. Galvanic corrosion
Discussion
34.

In which of the following methods, surface of a steel component becomes hard due to phase transformation austenite to martensite?
A. Carbonitriding
B. Flame hardening
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
35.

The gray cast iron has ____
A. high melting point
B. high thermal conductivity
C. low compressive strength
D. all of the above
Answer» C. low compressive strength
Discussion
36.

Chemical action during corrosion converts metal into metallic component as ________
A. hydroxide
B. oxide
C. sulphate
D. all of the above
Answer» E.
Discussion
37.

In Muntz metal, if 1% of tin is added it forms _____
A. admiralty brass
B. naval brass
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
38.

Nodules of graphite are observed in the microstructure of _______
A. white cast iron
B. malleable cast iron
C. spheroidal cast iron
D. all of the above
Answer» D. all of the above
Discussion
39.

Which of the following alloying elements are deoxidizers?
A. Aluminium
B. Silicon
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
40.

The erosion corrosion can be controlled by _______
A. increasing the flow velocity through pipes
B. increasing temperature of fluid
C. minimizing turbulence
D. all of the above
Answer» D. all of the above
Discussion
41.

Which of the following methods is not used to coat metallic elements to prevent corrosion?
A. Electroplating
B. Metal cladding
C. Metal spraying
D. None of the above
Answer» E.
Discussion
42.

Which of the following alloying elements prevent formation of austenite in high chromium steels?
A. Boron
B. Carbon
C. Manganese
D. Titanium
Answer» E.
Discussion
43.

In monotropic system, transition of one polymorph to another is _____
A. reversible
B. irreversible
C. either a or b
D. none of the above
Answer» C. either a or b
Discussion
44.

Corrosion fatigue is a combined effect of _____
A. Corrosive environment and mechanical stresses
B. Cyclic loading and corrosion
C. Velocity and mechanical stresses
D. None of the above
Answer» C. Velocity and mechanical stresses
Discussion
45.

What is the composition of cartridge brass?
A. 50 % Cu and 50 % Zn
B. 60 % Cu and 40 % Zn
C. 70 % Cu and 30 % Zn
D. 20 % Cu and 80 % Zn
Answer» D. 20 % Cu and 80 % Zn
Discussion
46.

At room temperature, hardness of precipitation hardening alloys ______
A. increases with time
B. decreases with time
C. remains constant
D. none of the above
Answer» B. decreases with time
Discussion
47.

Which of the following statements is/are true about Iron in Iron-Carbon equilibrium diagram ? 1. It is soft and ductile 2. It is allotropic in nature 3. It is magnetic above curie temperature 4. Below the temperature of 1539 °C, iron is in liquid state
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. All of the above
Answer» B. 2 and 3
Discussion
48.

Which of the following neutral elements neither form carbides nor cause graphitization?
A. Aluminium
B. Chromium
C. Cobalt
D. Copper
Answer» D. Copper
Discussion
49.

Which of the following phase is obtained as the end product, after complete heat treatment cycle in austempering process?
A. Austenite
B. Bainite
C. Martensite
D. Pearlite
Answer» C. Martensite
Discussion
50.

Which of the following statements is/are true for erosion corrosion?
A. The dissolution rate of protective film increases due to turbulent flow
B. Erosion corrosion occurs due to high turbulent fluid flow
C. The corrosion rate can be reduced by reducing the velocity of fluid
D. All of the above
Answer» E.
Discussion