# Typical Questions on Diploma Mechanical Engineering

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## Diploma Mechanical Engineering Typical Questions Paper

1. Centrifugal tension in belts is
(a) useful because it maintains some tension even when no power is transmitted
(b) not harmful because it does not take part in power transmission
(c) harmful because it increases belt tension and reduces the power transmitted
(d) a hypothetical phenomenon and does not actually exist in belts

2. The velocity ratio between pinion and gear in a gear drive is 2.3, the module of teeth is 2.0 mm and sum of number of teeth on pinion and gear is 99. What is the centre distance between pinion and the gear?
(a) 49.5 mm
(b) 99 mm
(c) 148.5 mm
(d) 198 mm

3. Which type of gear is used for shaft axes having an offset?
(a) Mitre gears
(b) Spiral bevel gears
(c) Hypoid gears
(d) Zerol gears

4. There are six gears A, B, C, D, E, F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of the angular speedsof the driven (F) to the driver (A) of the drive is
(a) ½4
(b) 1/8
(c) 4/15
(d) 12

5. In sliding contact bearings, a positive pressure can be built up and a loadsupported by a fluid only by the use of a:
(a) Diverging film
(b) Converging-diverging film
(c) Converging film
(d) Flat film

6. The rolling element bearings are
(a) Hydrostatic bearings
(b) Squeeze film bearings
(c) Antifriction bearings
(d) Grease lubrication bearings

7. In V belt drive, the belt touches
(a) At the bottom
(b) At sides only
(c) Could touch anywhere
(d) None of the above

8. The following is not a friction clutch
(a) Centrifugal clutch
(b) Cone clutch
(c) Disc clutch
(d) Fluid clutch

9. The gears used to connect non-parallel non-intersecting shafts is
(a) Straight bevel gear
(b) Spiral bevel gear
(c) Spiral gear
(d) Double helical gear

10. Calculate the speed of driving shaft in compound gear train, if the drivers have 50, 60, 80 and 100 teeth and follower have 18, 40, 60 and 80 teeth. Speed of driven shaft is 150 rpm
(a) 21.73 rpm
(b) 30.23 rpm
(c) 19.77 rpm
(d) Data insufficient

11. Two gears are said to have conjugate motion if
(a) They have constant angular velocity
(b) Variable angular velocity
(c) Infinitely small angular velocity
(d) None of the mentioned

12. Herringbone gear can be used in
(a) Intersecting shafts only
(b) Parallel shafts only
(c) Both intersecting and parallel shafts
(d) None of the mentioned

13. Which of the following is true for worm gears?
(a) Worm is in the shape of threaded screw
(b) Worm imposes high thrust loads
(d) Characterized by low speed reduction ratio

14. A journal of 120 mm diameter rotates in a bearing at a speed of 1000 rpm. What is the power lost during friction if 8 kN radial load acts on the journal and co-efficient of friction is 2.525×10-3?
(a) 7.615 kW
(b) 0.253 kW
(c) 0.126 kW
(d) 2.365 kW

15. Thick film lubrication describes a phenomenon where two surfaces are ____ separated
(a) Completely
(b) Partially
(c) Not
(d) None of the mentioned

16. If we exclude the cost factor, which bearing is preferred?
(a) Hydrodynamic
(b) Both are equally preferred
(c) Hydrostatic
(d) Cannot be determined

17. Where is the necking region?
(a) Area between lower yield point and upper yield point
(b) Area between plastic limit and elastic limit
(c) Area between ultimate point and initial point
(d) Area between the ultimate point and rupture

18. Eccentrically loaded structures have to be designed for
(a) Uniaxial force
(b) Biaxial force
(c) Combined axial force
(d) Combined biaxial force

19. _______ is as the maximum energy that can be absorbed within the proportionality limit.
(a) Proof resilience
(b) Modulus of resilience
(c) Impact resilience
(d) Resilience

20. In Mohr’s circle of strain, y-axis represents.
(a) Shear strain
(b) Half of shear strain
(c) Normal strain
(d) Half of normal strain

21. If the value of Poisson’s ratio is zero, then it means that
(a) The material is rigid
(b) The material is perfectly plastic
(c) There is no longitudinal strain in the material
(d) The longitudinal strain in the material is infinite

22. The highest stress that a material can withstand for a specified length of timewithout excessive deformation is called
(a) Fatigue strength
(b) Endurance strength
(c) Creep strength
(d) Creep rupture strength

23. In a body, thermal stress is induced because of the existence of:
(a) Latent heat
(b) Total heat
(d) Specific heat

24. Which one of the following properties is more sensitive to increase in strain rate?
(a) Yield strength
(b) Proportional limit
(c) Elastic limit
(d) Tensile strength

25. A block of steel is loaded by a tangential force on its top surface while the bottom surface is held rigidly. The deformation of the block is due to
(a) Shear only
(b) Bending only
(c) Shear and bending
(d) Torsion

## More Question Set on Mechanical Engineering Diploma MCQs from Various Exam

 Model Question Old Question Sample Papers Mock Test Practice Set Question Bank Important Questions Test Papers Typical Questions Selected Questions

26. The number of components in a stress tensor defining stress at a point in three dimensions is:
(a) 3
(b) 4
(c) 6
(d) 9

27. If principal stresses in a two-dimensional case are –10 MPa and 20 MPa respectively, then maximum shear stress at the point is
(a) 10 MPa
(b) 15 MPa
(c) 20 MPa
(d) 30 MPa

28. The bending moment (M) is constant over a length segment (I) of a beam. The shearing force will also be constant over this length and is given by
(a) M/I
(b) M/2I
(c) M/4I
(d) None of these

29. The maximum bending moment in a simply supported beam of length L loaded by a concentrated load W at the midpoint is given by
(a) WL
(b) WL/2
(c) WL/4
(d) WL/8

30. A beam simply supported at equal distance from the ends carries equal loads at each end. Which of the following statements is true?
(a) The bending moment is minimum at the mid-span
(b) The bending moment is minimum at the support
(c) The bending moment varies gradually between the supports
(d) The bending moment is uniform between the supports

31. Which one of the following is the correct statement? If for a beam dM/dx = 0 for its whole length, the beam is a cantilever:
(b) Subjected to a concentrated load at its free end
(c) Subjected to an end moment
(d) Subjected to a udl over its whole span

32. Principal planes are those planes on which
(a) Normal stress is maximum
(b) Normal stress is minimum
(c) Normal stress is either maximum or minimum
(d) Shear stress is maximum

33. Resilience can also be termed as
(a) Stress energy
(b) Strain energy
(c) Modulus
(d) Tenacity

34. Which of the following methods is also known as individual wall method?
(a) Centre line method
(b) Alignment method
(c) Long wall and short wall method
(d) Voluminous method

35. The ductility of a material is ____ to the increase in percentage reduction in an area.
(a) inversely proportional
(b) directly proportional
(c) equal
(d) uniform

36. The ratio of hoop stress to maximum shear stress is
(a) 2
(b) 3
(c) 4
(d) 6

37. The shear stress at outer surface of hollow circular section is
(a) Zero
(b) Maximum
(c) Minimum
(d) Can’t determine

38. The moment which resists the external bending is called
(a) Moment of shear
(b) Tolerating moment
(c) Moment of resistance
(d) Maximum bending moment

39. What is the strain energy stored in a body due to gradually applied load?
(a) sE/V
(b) sE2/V
(c) sV2/E
(d) sV2/2E

40. Poisson’s ratio is defined as ratio of
(a) axial strain to transverse strain
(b) transverse strain to axial strain
(c) shear strain to axial strain
(d) axial strain to shear strain

41. The point of contraflexure lies where
(a) shear force changes sign
(b) bending moment is zero or changes sign
(c) shear force is zero
(d) bending moment is maximum

42. What is the ratio of Youngs modulus E to shear modulus G in terms of Poisson ratio?
(a) 2(1 + m)
(b) 2(1 – m)
(c) 1/2 (1 – m)
(d) 1/2 (1 + m)

43. Hooke’s law holds good up to
(a) Yield point
(b) Limit of proportionality
(c) Breaking point
(d) Elastic limit

44. Which of the following is a spring-controlled governor?
(a) Hartnell governor
(b) Hartung governor
(c) Wilson-Hartnell governor
(d) all of these

45. When 1.0% plain carbon steel is slowly cooled from the molten state to 740°C, the resulting structure will contain –
(a) Pearlite and cementite
(b) Ferrite and cementite
(c) Austenite and ferrite
(d) Austenite and cementite

46. Increase in carbon content in plain carbon steels raise its –
(a) Ductility and UTS
(b) Tensile strength and malleability
(c) Tensile strength and hardness
(d) Ductility and melting temperature

47. The most widely used reinforcement in modern day FRP tennis racket is –
(a) Glass
(b) Carbon
(c) Aluminium
(d) Magnesium

48. During heat treatment of steel, the hardness of various structures in increasing order is-
(a) Martensite, fine pearlite, coarse pearlite, spherodite
(b) fine pearlite, Martensite, spherodite, coarse pearlite
(c) Martensite, coarse pearlite, fine pearlite, spherodite
(d) Spherodite, coarse pearlite, fine pearlite, Martensite

49. Pearlite is a combination of
(a) ferrite and cementite
(b) cementite and gamma iron
(c) ferrite and austenite
(d) ferrite and iron graphite

50. 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

51. German silver contains
(a) 1% silver
(b) 2.5% silver
(c) 5% silver
(d) 10% silver

52. 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

53. Hardness of steel greatly improves with –
(a) Annealing
(b) Cyaniding
(c) Normalising
(d) Tempering

54. The percentage of carbon in grey cast iron is in the range of –
(a) 0.25 to 0.75 percent
(b) 1.25 to 1.75 percent
(c) 3 to 4 percent
(d) 8 to 10 percent

55. If a particular Fe-C alloy contains less than 0.83% carbon, it is called –
(a) high speed steel
(b) hypoeutectoid steel
(c) hypereutectoid steel
(d) cast iron

56. The crystal structure of austenite is –
(a) BCC
(b) FCC
(c) HCP
(d) Body centred tetragonal

57. During normalizing process of steel, the specimen is heated –
(a) Between the upper and lower critical temperature and cooled in still air
(b) Above the upper critical temperature and cooled in furnace
(c) Above the upper critical temperature and cooled in still air
(d) Between the upper and lower critical temperature and cooled in furnace

58. For a ductile material, toughness is a measure of –
(a) Resistance to scratching
(b) Ability to absorb energy up to fracture
(c) Ability to absorb energy till elastic limit
(d) Resistance to indentation

59. The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is –
(a) Normalising
(b) Annealing
(c) Quenching
(d) Tempering

60. The “Jominy test” is used to find –
(a) Young’s modulus
(b) Hardenability
(c) Yield strength
(d) Thermal conductivity

61. 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

62. Which of the following alloys does not contain tin
(a) white metal
(c) fusible metal
(d) phosphor bronze

63. Gun metal contains
(a) 70% copper and 30% zinc
(b) 70-78% copper and rest tin
(c) 90% copper and 10% tin
(d) 85-92% copper and rest tin with little lead and nickel

64. The machinability of steel is increased by
(a) silicon and sulphur
(c) sulphur, graphite and aluminium
(d) phosphorous and aluminium

65. Cupola produces following material
(a) cast iron
(b) pig iron
(c) wrought iron
(d) malleable iron

66. Melting point of iron is
(a) 1539°C
(b) 1601°C
(c) 1489°C
(d) 1712°C

67. Which of the following pipes is least corrosion resistant
(a) Brass
(b) mild steel
(c) cast iron
(d) wrought iron

68. Tungsten in high speed steel provides
(a) hot hardness
(b) toughness
(c) wear resistance
(d) sharp cutting edge

69. Chromium in steel
(a) improves wear resistance, cutting ability and toughness
(b) refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
(c) improves cutting ability and reduces hardenability
(d) gives ductility, toughness, tensile strength and anticorrosion properties

70. An example of amorphous material is
(a) Zinc
(c) Silver
(d) glass

71. Eutectoid steel contains following percentage of carbon
(a) 0.02%
(b) 0.3%
(c) 0.63%
(d) 0.8%

72. Railway rails are normally made of
(a) mild steel
(b) tungsten steel
(c) alloy steel
(d) high carbon