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Engineering Mechanics

Engineering Mechanics
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Downwards
None of these
Upwards
Horizontal

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Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd3/32
πd4/32
πd4/64
πd3/16

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

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

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Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

g/2
√2.g
2g
g

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Engineering Mechanics
A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

3.0 cm
4.0 cm
5.0 cm
2.5 cm

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

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