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Theory of Machine

Theory of Machine
The critical speed of a shaft depends upon its

Mass and stiffness
Stiffness
Stiffness and eccentricity
Mass

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Theory of Machine
In a gear having involute teeth, the normal to the involute is a tangent to the

Base circle
Pitch circle
Addendum circle
Dedendum circle

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

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

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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
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

4
3
5
2

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Theory of Machine
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

Logarithmic decrement
Magnification factor
Damping factor
Critical damping ratio

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