# Mechanical Engineering Materials (MEM)-02

## ME3I

### Multiple Choice Questions (MCQs)

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1   Which of the following properties is impact strength indicative of?
(A)   Elasticity
(B)   Hardness
(C)   Stiffness
(D)   Toughness

2   Which of the following relation is stated by Hooke’s law?
(A)   Stress is directly proportional to strain
(B)   Stress is inversely proportional to strain
(C)   Stress is directly proportional to square of strain
(D)   Stress is inversely proportional to square of strain

3   The slope of the stress-strain curve in the elastic deformation region is ____________
(A)   Elastic modulus
(B)   Plastic modulus
(C)   Poisson’s ratio
(D)   None of the mentioned

4   What is the stress-strain curve?
(A)   It is the percentage of stress and stain
(B)   It is the relationship between stress and strain
(C)   It is the difference between stress and strain
(D)   None of the mentioned

5   Which point on the stress strain curve occurs after the proportionality limit?
(A)   Upper yield point
(B)   Lower yield point
(C)   Elastic limit
(D)   Ultimate point

6   Elastic limit is the point ____________
(A)   up to which stress is proportional to strain
(C)   Up to which if the load is removed, original volume and shapes are regained
(D)   None of the mentioned

7   Where is the necking region?
(A)   The area between lower yield point and upper yield point
(B)   The area between the plastic limit and elastic limit
(C)   The area between the ultimate point and initial point
(D)   The area between the ultimate point and rupture

8   What is the unit for stress?
(A)   N/m2
(B)   Nm2
(C)   N/m
(D)   Nm

9   Which of the following parameters can be obtained by tension test of a standard specimen?
(A)   Proportional Limit
(B)   Yield Strength
(C)   Percentage Reduction in area
(D)   All of the mentioned

10   Yield strength is defined as the maximum stress at which a marked increase in elongation occurs without increase in________
(B)   Strength
(C)   Toughness
(D)   Hardness

11   Melting point of iron in degree centigrade is equal to
(A)   768
(B)   1535
(C)   1410
(D)   910

12   Iron carbon phase diagram is
(A)   Unary phase
(B)   Binary phase
(C)   Tertiary phase
(D)   None of the mentioned

13   Peritectic reaction in iron carbon diagram takes place at temperature (in degree centigrade) is
(A)   1539
(B)   1493
(C)   910
(D)   1175

14   Percentage of carbon at a eutectic point is equal to
(A)   2.1
(B)   4.3
(C)   0.83
(D)   0.02

15   What is pearlite?
(A)   layered structure composed of alternating layers of ferrite and cementite
(B)   eutectic mixture of austenite and cementite.
(C)   layered structure composed of alternating layers of austenite and cementite
(D)   ferrite and cementite

16   What is ledeburite?
(A)   layered structure composed of alternating layers of ferrite and cementite
(B)   eutectic mixture of austenite and cementite.
(C)   ferrite and cementite
(D)   All of the above

17   MPa is the unit of —–
(A)   Stress
(B)   Young’s modulus
(C)   Bulk modulus
(D)   All of the above

18   Amount of energy absorbed by the materials before fracture is called.
(A)   Hardness
(B)   Toughness
(C)   Resilience
(D)   Endurance limit

19   Identify the mechanical property from following options.
(A)   Luster
(B)   Structure
(C)   Creep
(D)   Thermal conductivity

20   Find the compound which follows BCC structure from following options.
(A)   Pb
(B)   Ag
(C)   Au
(D)   Mo

21   Solid solution alloy is a mixture of two solids in a single phase.
(A)   Reversible
(B)   Irreversible
(C)   Partially reversible
(D)   Partially irreversible

22   Molybdenum tool steels contain which of the following percentage of alloying elements?
(A)   14-20%
(B)   14-17%
(C)   9-18%
(D)   3-7%

23   Identify the correct alloying element which increases machining ability of steel.
(A)   Nickel
(B)   Tungsten
(C)   Phosphorous
(D)   Copper

24   —– is compound having fixed carbon content of 6.67%.
(A)   Austenite
(B)   Cementite
(C)   Ledeburite
(D)   Martensite

25   Percentage of carbon at eutectoid point is equal to —–
(A)   2.1
(B)   4.3
(C)   0.83
(D)   0.18

26   Which metal has white colour due to absence of ______.
(A)   Graphite
(B)   Silver
(C)   Duralumin
(D)   Mild steel

27   Vanadium steel is appropriate for manufacturing of which of the following items?
(A)   Nuts
(B)   Shafts
(C)   Axles
(D)   Levers

28   Mild steel is not used for manufacturing of _______.
(A)   Machine tool beds
(B)   Cam shafts
(C)   Nuts
(D)   Bolts

29   Compressibility is reciprocal of —–
(A)   Shear modulus
(B)   Bulk modulus
(C)   Young’s modulus
(D)   Modulus of rigidity

30   Area under stress-strain curve represents —–
(A)   Hardness
(B)   Brittleness
(C)   Toughness
(D)   Fatigue

31   Identify the correct number of atoms present in the SCC unit lattice.
(A)   3
(B)   4
(C)   1
(D)   5

32   Find the brittle material.
(A)   Glass
(B)   Diamond
(C)   Both a & b
(D)   Steel

33   Which property occurs in steel at higher temperature?
(A)   Fatigue
(B)   Creep
(C)   Resilience
(D)   Toughness

34   Identify the element which is not added in alloy steels?
(A)   Aluminium
(B)   Boron
(C)   Chromium
(D)   Sodium

35   Pearlite is an intimate mixture of ______ and cementite.
(A)   Austenite
(B)   Ferrite
(C)   Martensite
(D)   Ledeburite

36   A homogeneous physically distinct and mechanical separable part of the system under study is —–
(A)   Phase
(B)   Pure metal
(C)   Alloy
(D)   Solid solution

37   In which of the following reactions solid phase is converted into two or more solids?
(A)   Eutectic
(B)   Eutectoid
(C)   Peritectic
(D)   Isomorphous

38   Find the element which is produces hot hardness by forming carbides in high-speed steel?
(B)   Tungsten
(C)   Chromium
(D)   Nickel

39   Tool steel is not used for of metals.
(A)   Working
(B)   Shaping
(C)   Cutting
(D)   Forging

40   Which of the following expands on solidification?
(A)   High carbon steel
(B)   Low carbon steel
(C)   White cast iron
(D)   Grey cast iron

41   In grey cast iron greater part of carbon is in form of —–
(A)   Flakes
(B)   Nodules
(C)   Spheroids
(D)   Holes

42   —– cannot be machined.
(A)   White cast iron
(B)   Grey cast iron
(C)   Spheroidal cast iron
(D)   Malleable cast iron

43   Nodular cast iron has tensile strength of pascals.
(A)   300
(B)   330
(C)   360
(D)   390

44   —– is an alloy of iron and carbon containing more than 2% carbon.
(A)   Steels
(B)   Hypoeutectoid steels
(C)   Hypereutectoid
(D)   Cast iron

45   A material also celled as intelligent or responsive materials.
(A)   Smart materials
(B)   Ceramics
(C)   Composites
(D)   Nano materials

46   Brass is an alloy of ______.
(A)   Copper and zinc
(B)   Copper and tin
(C)   Copper and nickel

47   Full form of PVC is ______.
(A)   Poly vinyl carbon
(B)   Poly vinex carbon
(C)   Poly vinyl chloride
(D)   Poly viscus carbon

48   Gray cast iron contains carbon in the form of graphite flakes.
(A)   TRUE
(B)   FALSE
(C)   Partially wrong
(D)   Can’t say

49   In general, the major classes of engineering materials are ______.
(A)   Metals, ceramics, and copper
(B)   Polymers. metals and composites
(C)   Steels, ceramics, polymer and aluminium
(D)   Metals. ceramics, polymers and composites

50   Melting point of copper is around _____.
(A)   1083 degree Celsius
(B)   983 degree Celsius
(C)   1183 degree Celsius
(D)   1283 degree Celsius

51   Pearlite is a ______ steel.
(A)   Eutectoid
(B)   Hyper Eutectoid
(C)   Hypo Eutectoid
(D)   Hyper Eutectic

52   Tempering requires heating hardened steel ________.
(A)   Below its upper critical temperature
(B)   Above its upper critical temperature
(C)   Below its lower critical temperature
(D)   Above its lower critical temperature

53   The slow and progressive deformation of a material with time at constant stress is called as _______.
(A)   Resilience
(B)   Creep
(C)   Fatigue
(D)   Elasticity

54   What is full form of HCHC.
(A)   High Cobalt High Chromium Steel
(B)   High carbon High Cobalt Steel
(C)   Heavy Carbon High Chromium Steel
(D)   High Carbon High Chromium Steel

55   A bearing material should not possess the characteristics of high ______.
(A)   Coefficient of friction
(B)   Hardness
(C)   Melting point
(D)   Thermal conductivity

56   An important characteristics of cast iron is _______.
(A)   Ductility
(B)   Elastic strength
(C)   Fatigue strength
(D)   Creep Strength

57   Ceramics having nuclear applications can be used as _______.
(A)   Moderators
(B)   Light weight
(C)   Melting material
(D)   Smart material

58   FG 400 means _______.
(A)   Gray cast iron with minimum tensile strength of 400 N/mm2
(B)   White cast iron with minimum tensile strength of 400 N/mm2
(C)   Nodular cast iron with minimum tensile strength of 400 N/mm2
(D)   Malleable cast iron with minimum tensile strength of 400 N/mm2

59   For hardening the tool made from high-speed steel, the quenching media used is _______.
(A)   Water
(B)   Brine solution
(C)   Salt
(D)   Oil

60   Match the correct percentage of carbon given in group – B for the type of material given in group – A.

Group – A   (Material)

Group – B   (Carbon percentage)

a) Hypo –   eutectoid steel

A) 4.3 – 6.67

b) Hyper –   eutectoid steel

B) 2.0 – 4.3

c) Hypo –   eutectoid cast iron

C) 0.8 – 2.0

d) Hyper –   eutectoid cast iron

D) 0.008 –   2.0

(A)   A, D, C, B
(B)   B, C, D, A
(C)   D, C, B, A
(D)   D, C, A, B

61   Red hardness of an alloy steel can be improved by adding _______.
(B)   Manganese
(C)   Titanium
(D)   Tungsten

62   The annealing heat treatment improves _______.
(A)   Grain size
(B)   Pig irons
(C)   Carbon content
(D)   Melting point

63   The material property which only depends on basic crystal structure is _______.
(A)   Elastic strength
(B)   Fatigue strength
(C)   Creep Strength
(D)   Fracture strength

64   Which of the following has a hexagonal close-packed crystal structure?
(A)   Silver
(B)   Iron
(C)   Magnesium
(D)   Aluminium

65   Which of the following is not a form of bronze?
(A)   Phosphorous bronze
(B)   Silicon bronze
(C)   Beryllium bronze
(D)   Arsenic bronze

66   Brinell hardness of gun metal is _______.
(A)   55
(B)   67
(C)   62
(D)   65

67   Porous self-lubricating bearing have sufficient porosity to hold upto of lubricating oil.
(A)   35%
(B)   37%
(C)   39%
(D)   40%

68   Nylons have good resistance to —–
(A)   Hot water
(B)   Alcohol
(C)   Ultra violet light
(D)   Abrasion

69   Piezoelectric material produces, when stress is applied.
(A)   Heat
(B)   Voltage
(C)   Strain
(D)   Light

70   Shape memory materials are also called as —–
(A)   Thermo responsive material
(B)   Pressure responsive material
(C)   Current responsive material
(D)   Voltage responsive material

71   PH sensitive material is used to indicate —–
(A)   Temperature level
(B)   Current level
(C)   Corrosion level
(D)   Resistance level

72   Quenching is not necessary when hardening is done by —–
(A)   Case hardening
(B)   Flame hardening
(C)   Nitriding
(D)   Carburizing

73   Maximum hardness is obtained in —–
(A)   Normalizing
(B)   Hardening
(C)   Annealing
(D)   Austempering

74   Coarse perlite is the product of process.
(A)   Normalizing
(B)   Hardening
(C)   Annealing
(D)   Martempering

75   The heat treatment process used for casting is —–
(A)   Normalizing
(B)   Carburizing
(C)   Annealing
(D)   Tempering

76   The cupola is used to manufacture —–
(A)   Pig iron
(B)   Cast iron
(C)   Wrought iron
(D)   Steel