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Theory of Machine

Theory of Machine
V-belts are usually used for

Short drives
Long and short drives
Long drives
None of these

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Theory of Machine
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

secβ
sinβ
cosβ
cosecβ

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Theory of Machine
Which of the following disciplines provides study of relative motion between the parts of a machine?

Mechanisms
Kinematics
Theory of machines
Applied mechanics

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

0° and 90°
270° and 360°
135° and 315°
90° and 180°

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Theory of Machine
Oldham’s coupling is an inversion of the kinematic chain used in

Elliptical trammels
Whitworth quick return mechanism
Rotary engine
Universal joint

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

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

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