# Test Papers on Diploma Mechanical Engineering

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## Diploma Mechanical Engineering Test Papers Paper

1. If some links are connected such that motion between them can take place in more than one direction, it is called
(a) incompletely constrained motion
(b) partially constrained motion
(c) completely constrained motion
(d) successfully constrained motion

2. Kinematic pairs are those which have two elements that
(a) have line contact
(b) have surface contact
(c) permit relative motion
(d) are held together

3. In higher pair, the relative motion is
(a) purely rotary
(b) purely sliding
(c) purely turning
(d) combination of sliding and turning

4. Relationship between the number of links (L) and number of pairs (P) is
(a) P = 2L-4
(b) P = 2L + 4
(c) P = 2L+2
(d) P = 2L-2

5. A mechanism where there are no restrictions on the relative motion between the particles, the mechanism is called
(a) Planar mechanism
(b) Flexure mechanism
(c) Spherical mechanism
(d) Spatial mechanism

6. A higher pair has__________.
(a) Point contact
(b) Surface contact
(c) No contact
(d) None of these

7. Which gear is used for connecting two coplanar and intersecting shafts?
(a) Spur gear
(b) Helical gear
(c) Bevel gear
(d) None of these

8. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
(a) 2
(b) 4
(c) 3
(d) None of these

9. The number of inversions for a slider crank mechanism is
(a) 6
(b) 5
(c) 4
(d) 3

10. Any point on a link connecting double slider crank chain will trace a
(a) Straight line
(b) Circle
(c) Ellipse
(d) Parabola

11. A universal joint is an example of
(a) Higher pair
(b) Lower pair
(c) Rolling pair
(d) Sliding pair

12. Which gear train is used for higher velocity ratios in a small space?
(a) Simple gear train
(b) Compound gear train
(c) Reverted gear train
(d) Epicyclic gear train

13. When the sleeve of a porter governor moves upwards, the governor speed
(a) Increases
(b) Decreases
(c) Remains unaffected
(d) First increases and then decreases

14. Idler pulley is used
(a) for changing the direction of motion of the belt
(b) for applying tension
(c) for increasing -velocity ratio
(d) all of these

15. Creep in belt drive is due to
(a) material of the pulley
(b) material of the belt
(c) larger size of the driver pulley
(d) uneven extensions and contractions due to varying tension

16. Typewriter constitutes
(a) Machine
(b) Structure
(c) mechanism
(d) inversion

17. The connection between the piston and cylinder in a reciprocating engine corresponding to
(a) completely constrained kinematic pair
(b) incompletely constrained kinematic pair
(c) successfully constrained kinematic pair
(d) single link

18. The minimum number of links in a single degree-of-freedom planar mechanism with both higher and lower kinematic pairs is
(a) 2
(b) 3
(c) 4
(d) 5

19. In a Kinematic chain, a quaternary joint is equivalent to:
(a) One binary joint
(b) Two binary joints
(c) Three binary joints
(d) Four binary joints

20. For a governor running at constant speed, what is the value of the force acting on the sleeve?
(a) Zero
(b) Variable depending upon the load
(c) Maximum
(d) Minimum

21. The height of Watt’s governor is
(a) directly proportional to the speed
(b) directly proportional to the (speed)2
(c) inversely proportional to the speed
(d) inversely proportional to the (speed)2

22. Which one of the following governors is used to drive a gramophone?
(a) Watt governor
(b) Porter governor
(c) Pickering governor
(d) Hartnell governor

23. A system in dynamic balance implies that
(a) the system is critically damped
(b) there is no critical speed in the system
(c) the system is also statically balanced
(d) there will be absolutely no wear of bearings

24. Two rotors are mounted on a shaft. If the unbalanced force due to one rotor is equal in magnitude to the unbalanced force due to the other rotor, but positioned exactly 180° apart, then the system will be balanced
(a) Statically
(b) Dynamically
(c) statically as well as dynamically
(d) neither statically nor dynamically

25. The cam follower generally used in automobile engines is
(a) Knife edge follower
(b) Flat faced follower
(c) Spherical faced follower
(d) Roller follower

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

26. Off set is provided to a cam follower mechanism to
(a) Minimise the side thrust
(b) Accelerate
(c) Avoid jerk
(d) None of these

27. When the driving torque is more than load torque, flywheel is ______
(a) Accelerated
(b) Decelerated
(c) Constant velocity
(d) Can’t be determined

28. Which of the following factors are not responsible for unbalancing in rotating systems?
(a) Errors
(b) Tolerances
(c) Shape of the rotor
(d) None of these

29. The secondary unbalanced force is __________ the primary unbalanced force.
(a) One-half
(b) Two-third
(c) Times
(d) 1/n times

30. In under damped vibrating system, the amplitude of vibration
(a) Decreases linearly with time
(b) Increases linearly with time
(c) Decreases exponentially with time
(d) Increases exponentially with time

31. Torsional vibrations are said to occur when the particles of a body moves
(a) Perpendicular to its axis
(b) Parallel to its axis
(c) In a circle about its axis
(d) None of these

32. When _______ occurs below a critical power input the gas bubbles are not affected laterally but move upward.
(a) Weeping
(b) Flooding
(c) Mixing
(d) Entrainment

33. The critical speed of a rotating shaft depends upon
(a) Mass
(b) Stiffness
(c) Mass and Stiffness
(d) Mass, Stiffness and eccentricity

34. Cotter joint is used when the members are subjected to which type of stresses?
(a) Axial tensile
(b) Axial compressive
(c) Axial tensile or compressive
(d) None of these

35. Which of the following is not a part of cotter joint?
(a) Socket
(b) Spigot
(c) Cotter
(d) Collar

36. Determine the width of the cotter used in cotter joint connecting two rods subjected to axial load of 50 kN and permissible shear stress in cotter is 50 N/mm2. given thickness of cotter is 10 mm.
(a) 50 mm
(b) 100 mm
(c) 150 mm
(d) 25 mm

37. A sunk key fits in the keyway of the _____ only
(a) Hub
(b) Sleeve
(c) Both hub and sleeve
(d) Neither hub nor sleeve

38. The main advantage of sunk key is that it is a ______ drive.
(a) Positive
(b) Negative
(c) Neutral
(d) Can’t predict

39. Involute splines have stub teeth with a pressure angle of
(a) 30
(b) 45
(c) 60
(d) Can’t be determined

40. The pitch of threads on a lock nut in comparison to pitch of nut is
(a) Same
(b) Coarser
(c) Finer
(d) Very coarse

41. Buttress threads are usually found on
(a) Screw cutting lathes
(b) Feed mechanism
(c) Splines of bench vice
(d) Railway carriage couplings

42. For tight leakage joints, the following type of thread is best suited
(a) Metric
(b) Buttress
(c) Square
(d) NPT (national pipe thread)

43. Belt slip may occur due to
(a) Heavy load
(b) Loose belt
(c) Driving pulley too small
(d) All of these

44. Which one of the following causes the whirling of shafts?
(a) Non-homogeneity of shaft material
(b) Misalignment of bearings
(c) Fluctuation of speed
(d) Internal damping

45. The size of a gear is usually specified by
(a) pressure angle
(b) circular pitch
(c) diametral pitch
(d) pitch circle diameter

46. Stress concentration in static loading is more serious in
(a) ductile materials
(b) brittle materials
(c) equally serious in both cases
(d) depends on other factors

47. In a gib and cotter joint, the gib and cotter are subjected to
(a) single shear only
(b) double shear only
(c) single shear and crushing
(d) double shear and crushing

48. A key connecting a flange coupling to a shaft is likely to fail in
(a) Shear
(b) Tension
(c) torsion
(d) bending

49. Which one of the following is not a friction clutch?
(a) Disc or plate clutch
(b) Cone clutch
(c) Centrifugal clutch
(d) Jaw clutch

50. The creep in a belt drive is due to the
(a) material of the pulleys
(b) material of the belt
(c) unequal size of the pulleys
(d) unequal tension on tight and slack sides of the belt