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Engineering Mechanics

Engineering Mechanics
Which of the following are vector quantities?

Linear displacement
All of these
Linear acceleration
Linear velocity

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

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

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Engineering Mechanics
If a body is acted upon by a number of coplanar non-concurrent forces, it may

Rotate about itself without moving
All of these
Be completely at rest
Move in any one direction rotating about itself

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Engineering Mechanics
The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

2mr²/5
3mr²/5
3mr²/10
4mr²/5

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P × m.a = 0
P/m.a = 0
P + m.a = 0
P - m.a = 0

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Engineering Mechanics
The mechanical advantage of a lifting machine is the ratio of

Load lifted to the effort applied
Output to the input
All of these
Distance moved by effort to the distance moved by load

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