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Mechanical Engineering Objective Questions { Theory of Machines }

50. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by
A.Universal joint
B.Knuckle joint
C.Oldham's coupling
D.Flexible coupling

51. The c.g. of a link in any mechanism would experience
A.No acceleration
B.Linear acceleration
C.Angular acceleration
D.Both angular and linear accelerations

52. In elliptical trammels
A.All four pairs are turning
B.Three pairs turning and one pair sliding
C.Two pairs turning and two pairs sliding
D.One pair turning and three pairs sliding

53. In automobiles the power is transmitted from gear box to differential through
A.Bevel gear
B.Universal joint
C.Hooke's joint
D.Knuckle joint

54. Crowning on pulleys helps
A.In increasing velocity ratio
B.In decreasing the slip of the belt
C.For automatic adjustment of belt position so that belt runs centrally
D.Increase belt and pulley life

55. 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 the above

56. In multi-V-belt transmission, if one of the belt is broken, we have to change the
A.Broken belt
B.Broken belt and its adjacent belts
C.(e) all the belts
D.There is no need of changing any one as remaining belts can take care of transmission of load

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