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Theory of Machine

Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

Zero
None of these
Minimum
Maximum

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Theory of Machine
The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is

Fc = a/r + b
Fc = ar - b
Fc = ar + b
Fc = ar

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Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W sinθ
W tanθ
W cosθ
W cosecθ

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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 minimum length of the coupler will be

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

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Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

10°
30°
14°
20°

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Theory of Machine
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

To raise the stern and lower the bow
To raise the bow and lower the stern
To move the ship towards port side
To move the ship towards starboard

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