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Theory of Machine

Theory of Machine
In an ideal machine, the output as compared to input is

May be less or more depending on efficiency
Less
More
Equal

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

The pressure developed being high provides tight sealing
Power absorbed is less
Wear is less
Both wear and power absorbed are low

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Theory of Machine
A slider crank chain consists of following numbers of turning and sliding pairs

2, 2
3, 1
1, 3
4, 0

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Theory of Machine
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the center of gravity is equal to the radius of gyration of the body about its center of gravity.

Minimum
Zero
None of these
Maximum

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) cosφ]/2
[(r + R) sinφ]/2
[(r² + R²) sinφ]/2
[(r² + R²) cosφ]/2

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Theory of Machine
The mechanism in which two are turning pairs and two are sliding pairs, is called a

All of these
Elliptical trammel
Double slider crank chain
Scotch yoke mechanism

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