Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

An ideal machine is one whose efficiency is
A:
between 60 and 70 %
B:
between 70 and 80%
C:
between 80 and 90%
D:
100%
Answer: D
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If a body is thrown upwards, then the gravitational acceleration is taken as zero.
A:
Correct
B:
Incorrect
C:
D:
Answer: B
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Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.
A:
nine times
B:
six times
C:
four times
D:
two times
Answer: A
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The impact between two lead spheres is approximately equal to an __________ impact.
A:
elastic
B:
inelastic
C:
D:
Answer: B
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A machine having an efficiency greater than 50%, is known as
A:
reversible machine
B:
non-reversible machine
C:
neither reversible nor non-reversible machine
D:
ideal machine
Answer: A
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