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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

At 45° to AB
Perpendicular to AB
Parallel to AB
Along AB

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Theory of Machine
The factor which affects the critical speed of a shaft is

Eccentricity
All of the listed here
Diameter of disc
Span of shaft

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Spherical pair
Rolling pair
Sliding pair
Turning pair

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

Bearing centre line coincides with the axis
Resonance is caused due to the heavy mass of the rotor
The system is unbalanced
The shafts are rotating at very high speeds

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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
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Positive during major portion of the stroke
Negative during major portion of the stroke
Positive throughout

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