Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 188 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.

Delta iron occurs at temperature of_______________?
A. room temperature
B. above melting point
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above
Answer» D. between 910°C and 1400°C
Discussion
2.

Lead is poured into the joint between two pipes. These pipes may be made of____________________?
A. cast iron
B. vitrified clay
C. asbestos cement
D. concrete
E. mild steel
Answer» B. vitrified clay
Discussion
3.

Brass contains___________________?
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70% copper and 30% tin
Answer» B. 90% copper and 10% tin
Discussion
4.

Gun metal contains__________________?
A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-78% copper and rest tin
E. 85-92% copper and rest zinc
Answer» D. 70-78% copper and rest tin
Discussion
5.

Hardness of upper bainite (acicular structure) is about___________________?
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32.
Answer» C. RC 57
Discussion
6.

The surface hardness of the following order is achieved by nitriding operation__________________?
A. 600 VPN
B. 1500 VPN
C. 1000 to 1100 VPN
D. 250 VPN
E. 2000 VPN
Answer» D. 250 VPN
Discussion
7.

Argentite is the principal ore or raw material for _________________?
A. aluminium
B. tin
C. zinc
D. lead
E. silver
Answer» F.
Discussion
8.

The elastic stress strain behaviour of rubber is_____________________?
A. linear
B. non-linear
C. plastic
D. no fixed relationship
E. unpredictable behaviour
Answer» C. plastic
Discussion
9.

An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
A. compressive strength
B. ductility
C. carbon content
D. hardness
E. surface finish
Answer» C. carbon content
Discussion
10.

Annealing of white cast iron results in production of_________________?
A. malleable iron
B. nodular iron
C. spheroidal iron
D. grey iron
E. none of the above
Answer» B. nodular iron
Discussion
11.

Carbon in iron is an example of__________________?
A. substitutional solution
B. interstitial solid solution
C. intermetallic compounds
D. all of the above
E. none of the above
Answer» C. intermetallic compounds
Discussion
12.

Malleability of a material can be defined as ______________________?
A. ability to undergo large permanent deformations in compression
B. ability to recover its original form
C. ability to undergo large permanent deformations in tension
D. all of the above
E. none of the above
Answer» B. ability to recover its original form
Discussion
13.

Stress relaxation is- the phenomenon ___________________?
A. in which parts are not loaded
B. in which stress remains constant on in-creasing load
C. in which deformation tends to loosen the joint and produces a stress reduced
D. stress reduces on increasing load
E. none of the above
Answer» D. stress reduces on increasing load
Discussion
14.

Isotropic materials are those which have the same ____________________?
A. elastic properties in all directions
B. stresses induced in all directions
C. thermal properties in all directions
D. electric and magnetic properties in all directions
E. density throughout
Answer» B. stresses induced in all directions
Discussion
15.

Mild steel belongs to the following category___________________?
A. low carbon steel
B. medium carbon steel
C. high carbon steel
D. alloy steel
E. special steel
Answer» B. medium carbon steel
Discussion
16.

Acidic solution is one which has pH value__________________?
A. greater than 7
B. less than 7
C. equal to 7
D. pH value has nothing to do with neutral solution
E. none of the above
Answer» C. equal to 7
Discussion
17.

The ability of a material to resist softening at high temperature is known as____________________?
A. creep
B. hot tempering
C. hot hardness
D. fatigue
E. superhardening
Answer» D. fatigue
Discussion
18.

Points of arrest for iron correspond to__________________?
A. stages at which allotropic forms change
B. stages at which further heating does not increase temperature for some time
C. stages at which properties do not change with increase in temperature
D. there is nothing like points of arrest
E. none of the above
Answer» B. stages at which further heating does not increase temperature for some time
Discussion
19.

The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?
A. increase
B. decrease
C. remain same
D. first increase and then decrease
E. show unpredictable behaviour
Answer» B. decrease
Discussion
20.

A material is known as allotropic or polymorphic if it __________________?
A. has a fixed structure under all conditions
B. exists in several crystal forms at different temperatures
C. responds to heat treatment
D. has its atoms distributed in a random pattern
E. none of the above
Answer» C. responds to heat treatment
Discussion
21.

Which of the following constituents of steels is softest and least strong ________________?
A. austenite
B. pearlite
C. ferrite
D. cementlte
E. bainite
Answer» D. cementlte
Discussion
22.

Following elements have face-centred cubic structure__________________?
A. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. a iron (below 910°C and between 1400 to 1539°C), W
D. all of the above
E. none of the above
Answer» B. Mg, Zn, Ti, Zr, Br, Cd
Discussion
23.

The alloy used for making electrical resistances and heating elements is____________________?
A. nichrome
B. invar
C. magnin
D. elinvar
E. peiminvar
Answer» B. invar
Discussion
24.

Babbit metal is a_________________?
A. lead base alloy
B. tin base alloy
C. copper base alloy
D. all of the above
E. A. and C. above
Answer» F.
Discussion
25.

Age-hardening is related with______________?
A. stainless steel
B. gun metal
C. german silver
D. duralumin
E. cast iron
Answer» E. cast iron
Discussion
26.

German silver contains_________________?
A. 1% silver
B. 2.5% silver
C. 5% silver
D. 10% silver
E. 100% silver
Answer» D. 10% silver
Discussion
27.

Phosphor bronze contains____________________?
A. 0.5% of phosphorous
B. 1% phosphorous
C. 2.5% phosphorous
D. 5% phosphorous
E. none of the above
Answer» F.
Discussion
28.

Dow metal contains____________________?
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C. 90% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 90% magnesium and 10% tin
Answer» E. 90% magnesium and 10% tin
Discussion
29.

Constantant an alloy used in thermocouples is an alloy of __________________?
A. copper and tin
B. copper and zinc
C. copper and iron
D. copper and nickel
E. copper and chromium
Answer» E. copper and chromium
Discussion
30.

Permalloy is a___________________?
A. kind of stainless steel
B. none ferrous alloy
C. polymer
D. cutting tool material
E. nickel and iron alloy having high permeability
Answer» F.
Discussion
31.

Addition of lead and bismuth to aluminium results in_________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above
Answer» E. none of the above
Discussion
32.

Free cutting steels_____________________?
A. are used where ease in machining is the criterion
B. contain carbon in free form
C. require least cutting force
D. do not exist
E. can be cut freely even under adverse conditions
Answer» B. contain carbon in free form
Discussion
33.

Addition of silicon to aluminium results in____________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above
Answer» B. improvement of corrosion resistance
Discussion
34.

Admiralty gun metal contains__________________?
A. 63 to 67% nickel and 30% copper
B. 88% copper, 10% tin and rest zinc
C. alloy of tin, lead and cadmium
D. iron scrap and zinc
E. none of the above
Answer» C. alloy of tin, lead and cadmium
Discussion
35.

Which is false statement about properties of aluminium ___________________?
A. modulus of elasticity is fairly low
B. wear resistance is very good
C. fatigue strength is not high
D. creep strength limits its use to fairly low temperatures
E. corrosion resistance is good
Answer» C. fatigue strength is not high
Discussion
36.

Addition of manganese to aluminium results in__________________?
A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above
Answer» C. one of the best known age and precipitation-hardening systems
Discussion
37.

Which of the following alloys does not have copper as one of the constituents________________?
A. delta metal
B. monel metal
C. constantan
D. nichrome
E. silicon bronze
Answer» E. silicon bronze
Discussion
38.

The correct composition of Babbit metal is__________________?
A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
C. 87% Sn, 4% Cu, 8% Sb, 1% Al
D. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
E. none of the above
Answer» B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
Discussion
39.

White metal contains__________________?
A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. alloy of tin, lead and cadmium
D. silver and chromium
E. malleable cast iron and silver
Answer» D. silver and chromium
Discussion
40.

Which of the following has highest specific strength of all structural materials__________________?
A. magnesium alloys
B. titanium alloys
C. chromium alloys
D. magnetic steel alloys
E. none of the above
Answer» C. chromium alloys
Discussion
41.

Foundry crucible is made of_________________?
A. mild steel
B. german silver
C. lead
D. cast iron
E. graphite
Answer» F.
Discussion
42.

Ferromagnetic alpha iron exists in temperature range of________________?
A. below 723°C
B. 770 – 910°C
C. 910-1440°C
D. 1400-1539°C
E. above 1539°C
Answer» B. 770 – 910°C
Discussion
43.

Aluminium bronze contains__________________?
A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 10% aluminium and 90% tin
Answer» D. 90% magnesium and 9% aluminium with some copper
Discussion
44.

Neutral solution is one which has pH value__________________?
A. greater than 7
B. less than 7
C. equal to 7
D. pH value has nothing to do with neutral solution
E. none of the above
Answer» D. pH value has nothing to do with neutral solution
Discussion
45.

Basic solution is one which has pH value___________________?
A. greater than 7
B. equal to 7
C. less than 7
D. pH value has nothing to do with basic solution
E. none of the above
Answer» B. equal to 7
Discussion
46.

Austenite rs a combination of_________________?
A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite
Answer» C. ferrite and austenite
Discussion
47.

Recrystallisation temperature can belowered by_________________?
A. purification of metal
B. grain refinement
C. working at lower temperature
D. all of the above
E. none of the above
Answer» E. none of the above
Discussion
48.

A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?
A. molecular change
B. physical change
C. allotropic change
D. solidus change
E. atomic change
Answer» D. solidus change
Discussion
49.

For the allotropic forms of iron, the points of arrest are __________________?
A. the points where no further change oc-curs
B. constant for all metals
C. the points where there is no further flow of metal
D. the points of discontinuity
E. the points where major changes take place
Answer» E. the points where major changes take place
Discussion
50.

In malleable iron, carbon is present in the form of___________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
Answer» F.
Discussion