# Mock Test on Diploma Mechanical Engineering

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## Diploma Mechanical Engineering Mock Test Paper

1. A shaft with collars at both ends fitted into a circular hole is a popular example of
(a) rolling pair
(b) turning pair
(c) sliding pair
(d) spherical pair

2. A kinematic chain is called a mechanism, if the number of fixed links is
(a) at most one
(b) at least one
(c) more than one
(d) none of these

3. Frequency of vibrations is usually expressed in
(a) Number of cycles per hour
(b) Number of cycles per second
(c) Number of cycles per minute
(d) Number of cycles per day

4. In a spur gear, the circle on which the involute is generated is called the
(a) base circle
(b) clearance circle
(c) pitch circle

5. The power transmitted by a belt drive is maximum when the ratio of maximum tension in the belt to that of centrifugal tension is
(a) 2
(b) 3
(c) 4
(d) none of these

6. Which one of the following is a dead weight governor?
(a) Watt governor
(b) Hartnell governor
(c) Porter governor
(d) Hartung governor

7. The balancing of rotating and reciprocating parts of an engine is necessary when it runs at
(a) high speed
(b) low speed
(c) moderate speed
(d) all of these

8. When two elements have point or line contact motion, the pair so formed is known as
(a) higher pair
(b) lower pair
(c) closed pair
(d) screw pair

9. Coriolis component of acceleration is considered in case of
(a) quick return motion mechanism
(b) slider crank mechanism
(c) four bar mechanism
(d) none of these

10. Train value of a gear train is
(a) always less than unity
(b) always greater than unity
(c) equal to reciprocal of speed ratio
(d) equal to speed ratio of gear train

11. The product of circular pitch and diameteral pitch is equal to
(a) Module
(b) Unity
(c) Π
(d) 1/ Π

12. At node of the shaft, the vibrations are
(a) Minimum
(b) Maximum
(c) Zero
(d) any value between minimum and maximum

13. Rankine’s theory of failure is applicable for which of the following type of materials?
(a) Brittle
(b) Ductile
(c) Elastic
(d) plastic

14. The rated life of a bearing under a given load (L) is inversely proportional to the

15. Which one of the following bearings is most suitable for carrying very heavy loads with slow speed?
(a) hydrodynamic bearing
(b) ball bearing
(c) roller bearing
(d) hydrostatic bearing

16. In designing a plate clutch, assumption of uniform wear conditions is made because it leads to
(a) real life design
(b) safer design
(c) cost effective design
(d) efficient design

17. During shearing failure of the key, the area under shear is
(a) both length and thickness
(b) both width and thickness
(c) both length and width
(d) only length

18. The largest diameter of an external or internal screw thread is known as
(a) major diameter
(b) minor diameter
(c) root diameter
(d) pitch diameter

19. The failure of material is called fatigue when it falls
(a) below the yield point
(b) below the elastic point
(c) above the yield point
(d) above the elastic point

20. In design analysis, factor of safety is defined as the ratio between material strength and
(a) yield strength
(b) ultimate strength
(d) allowable strength

21. When two non-intersecting and non-coplanar shafts are connected by gears, the arrangements are known as
(a) spur gearing
(b) helical gearing
(c) bevel gearing
(d) spiral gearing

22. The efficiency of a welded joint, compared to a riveted joint is
(a) More
(b) Less
(c) equal
(d) unpredictable

23. A cotter joint is used to connect two rods which are in
(a) tension only
(b) compression only
(c) tension and compression
(d) shear only

24. Self-locking is not possible in the case of
(a) simple band brake
(b) differential band brake
(c) simple block brake
(d) internal expanding shoe brake

25. The life of an open belt in comparison to a cross belt is
(a) More
(b) Less
(c) Equal
(d) unpredictable

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

26. In a V-belt drive, the belt touches the pulley
(a) at bottom
(b) at sides only
(c) at bottoms and sides
(d) some cases bottom and some cases sides

27. A shaft directly coupled to a power source is called
(a) line shaft
(b) counter shaft
(c) flexible shaft
(d) jack shaft

28. A round key is used for
(a) light duty
(b) medium duty
(c) heavy duty
(d) extra heavy duty

29. Oldhum coupling is used to connect
(a) aligned shafts
(b) shafts with lateral misalignment
(c) intersecting shafts
(d) parallel shafts

30. The transverse fillet weld joints are designed for
(a) tensile strength
(b) bending strength
(c) compressive strength
(d) shear strength

31. The resistance by which material of a body opposes the deformation is known as
(a) reaction of material
(b) strain of material
(c) resistivity of material
(d) strength of material

32. The ratio of the lateral strain to the linear strain is called
(a) modulus of rigidity
(b) Poisson’s ratio
(c) bulk modulus
(d) modulus of elasticity

33. The load required to produce unit deflection in a spring is called
(a) stiffness constant
(b) strain constant
(c) rigidity constant
(d) torsional constant

34. For a material, Young’s modulus is given as 1.2×105 N/mm2 and Poisson’s ratio is 0.25. The Bulk modulus of the material is
(a) 0.8×105 N/mm2
(b) 1.8×105 N/mm2
(c) 0.5×105 N/mm2
(d) 1.2×105 N/mm2

35. Hooke’s law holds well within the limit of
(a) Polarity
(b) yield point
(c) elasticity
(d) plasticity

36. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is called
(a) tensile stress
(b) compressive stress
(c) shear stress
(d) thermal stress

37. Young’s modulus may be defined as the ratio of stress to strain under
(a) shear condition
(b) lateral condition
(c) linear condition
(d) all of these

38. In a tensile test of a specimen, the ratio of maximum load to the original cross sectional area of the test piece is called
(a) ultimate stress
(b) safe stress
(c) breaking stress
(d) permissible stress

39. The shear stress required to cause plastic deformation of solid metal is called
(a) proof stress
(b) flow stress
(c) ultimate stress
(d) none of these

40. The buckling load for a given column depends on
(b) length of column
(c) modulus of elasticity
(d) all of these

41. A beam is loaded as cantilever. If the load at the free end is increased, the failure will occur
(a) at the point of the load
(b) at the middle of the beam
(c) at the fixed end of the beam
(d) at any location of the beam

42. The bending moment diagram for a cantilever beam carrying uniformly distributed load will be a
(a) Rectangle
(b) Triangle
(c) Parabola
(d) hyperbola

43. The materials which exhibit the same elastic properties in all direction are called
(a) homogeneous
(b) inelastic
(c) isotropic
(d) anisotropic

44. Maximum shear stress in a Mohr’s circle is
(a) equal to radius of Mohr’s circle
(b) greater than radius of Mohr’s circle
(c) less than radius of Mohr’s circle
(d) could be any one of these

45. Strain energy stored in a solid circular shaft is proportional to ( GJ is torsional rigidity)
(a) GJ
(b) 1/GJ
(c) 1/(GJ)2
(d) (GJ)2

46. The relation between Young’s modulus (E), bulk modulus (G) and Poisson’s ratio (μ) of an elastic material is
(a) E = 3G (1 – 2μ)
(b) E = 2G (1 – 2μ)
(c) E = 2G (1 + μ)
(d) E = 2G (1 – μ)

47. The maximum bending moment in a simply supported beam carrying a total load W, uniformly distributed on the entire span L is equal to
(a) WL/2
(b) WL/3
(c) WL/4
(d) WL/8

48. Rankine’s formula for determining the load carrying capacity of a column is valid for
(a) long column only
(b) short column only
(c) columns with hinged ends only
(d) all columns

49. The number of nearest neighboring atoms in Face-centred cubic (FCC) crystal is
(a) Six
(b) Eight
(c) Twelve
(d) none of these

50. The property of the material due to which it can cut another material is known as
(a) ductility
(b) malleability
(c) hardness
(d) none of these