Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
A:
reversible
B:
non-reversible
C:
ideal
D:
Answer: A
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The process of finding out the resultant force is called __________ of forces.
A:
composition
B:
resolution
C:
D:
Answer: A
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The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
A:
3r/ 8
B:
4r/ 3π
C:
8r/3
D:
3r/4π
Answer: B
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The maximum efficiency of a lifting machine is
A:
1/m
B:
V.R./m
C:
m/V.R.
D:
1/(m x V.R.)
Answer: D
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The angular velocity (in rad / s) of a body rotating at N revolutions per minute is
A:
πN/60
B:
πN/180
C:
2πN/60
D:
2πN/180
Answer: C
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