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Theory of Machine

Theory of Machine
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called

Working depth
Addendum
Dedendum
Clearance

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Theory of Machine
The D-slide valve is also known as

Piston slide valve
Inside admission valve
None of these
Outside admission valve

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Theory of Machine
Efficiency of a screw jack is given by

tan (α - φ)/tanα
tanα/tan (α +φ)
tan (α + φ)/tanα
tanα/tan (α - φ)

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Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Increases as the radius of rotation decreases
Increases as the radius of rotation increases
Remain constant for all radii of rotation
Decreases as the radius of rotation increases

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Theory of Machine
The unbalanced force due to reciprocating masses

Constant in magnitude and direction both
Varies in magnitude and direction both
Varies in magnitude but constant in direction
Varies in direction but constant in magnitude

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Minimize the effect of secondary forces
To start the locomotive quickly
Have perfect balancing
Minimize the effect of primary forces

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