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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics
If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is

None of these
—rad/sec 30
—rad/sec 10
—rad/sec 20

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Applied Mechanics and Graphic Statics
In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is

50
30
80
60

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Applied Mechanics and Graphic Statics
The force polygon representing a set of forces in equilibrium is a

Parallelogram
Closed polygon
Open polygon
Triangle

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Applied Mechanics and Graphic Statics
Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis?

Disc with smaller density
Both discs will have same rotational inertia
Disc with larger density
None of these

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Applied Mechanics and Graphic Statics
The point about which combined motion of rotation and translation of a rigid body takes place, is known as

Point of rotation
Instantaneous centre
Instantaneous axis
Virtual centre

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Applied Mechanics and Graphic Statics
A train weighing 196 tonnes experiences a frictional resistance of 5(11/22) per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is

3 √5 m/sec
5 √10 m/sec
10 √5 m/sec
5 √3 m/sec

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