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Theory of Machine

Theory of Machine
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

Product
Ratio
Difference
Sum

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2 mm
3.0 mm
2.22 mm
2.50 mm

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

45 mm
Slightly less than 95 mm
95 mm
Slightly more than 95 mm

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Theory of Machine
The lead screw of a lathe with nut forms a

Screw pair
Sliding pair
Rolling pair
Turning pair

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Theory of Machine
In a steam engine, the link constitutes a

All of these
Piston, piston rod and cross-head
Connecting rod with big and small end brasses, caps and bolts
Crank pin, crankshaft and flywheel

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Theory of Machine
The centre of gravity of a coupler link in a four bar mechanism will experience

Both linear and angular acceleration
Only linear acceleration
No acceleration
Only angular acceleration

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