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Engineering Mechanics

Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

None of these
Less than
More than
Equal to

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Engineering Mechanics
The velocity ratio of a first system of pulleys with 4 pulleys is

16
20
4
8

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Non-reversible machine
Reversible machine
Neither reversible nor non-reversible machine
Ideal machine

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 + tanφ)/(1 - tanφ)
(1 + sinφ)/(1 - sinφ)
(1 - sinφ)/(1 + sinφ)
(1 - tanφ)/(1 + tanφ)

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Engineering Mechanics
The friction experienced by a body, when at rest, is known as

Static friction
Limiting friction
Dynamic friction
Coefficient of friction

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Engineering Mechanics
The power developed by a body acted upon by a torque 'T' Newton meter (N - m) and revolving at ω radian/s is given by

T.ω/4500 (in kilowatts)
T.ω/60 (in watts)
T.ω (in watts)
T.ω/75 (in kilowatts)

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