Exercise: Theory Of Machines

Questions for: Theory Of Machines

A Porter governor is a
A:
pendulum type governor
B:
dead weight governor
C:
spring loaded governor
D:
inertia governor
Answer: B
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The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l1 and l2 = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)
A:
l1 = kG
B:
l2 = kG
C:
l1l2 = kG
D:
l1l2 = kG2
Answer: D
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The maximum fluctuation of speed is the
A:
difference of minimum fluctuation of speed and the mean speed
B:
difference of the maximum and minimum speeds
C:
sum of maximum and minimum speeds
D:
variations of speed above and below the mean resisting torque line
Answer: B
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The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
A:
unbalanced couples are caused only at higher speeds
B:
unbalanced forces are not dangerous at higher speeds
C:
effects of unbalances are proportional to the square of the speed
D:
effects of unbalances are directly proportional to the speed
Answer: C
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The arrangement is called bevel gearing, when two __________ are connected by gears.
A:
intersecting and coplaner shafts
B:
non-intersecting and non-coplaner shafts
C:
parallel and coplaner shafts
D:
parallel and non-coplaner shafts
Answer: A
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