Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
A:
directly
B:
inversely
C:
D:
Answer: A
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The motion of a wheel of a car is
A:
purely translation
B:
purely rotational
C:
combined translation and rotational
D:
none of these
Answer: C
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The velocity ratio of a single purchase crab winch can be increased by
A:
increasing the length of the handle
B:
increasing the radius of the load drum
C:
increasing the number of teeth of the pinion
D:
all of the above
Answer: A
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The moment of inertia of a square of side (a) about an axis through its centre of gravity is
A:
a4/4
B:
a4/8
C:
a4/12
D:
a4/36
Answer: C
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According to Newton's first law of motion,
A:
every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B:
the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
C:
to every action, there is always an equal and opposite reaction
D:
none of the above
Answer: A
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