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Theory of Machine

Theory of Machine
The type of gears used to connect two non parallel and non intersecting shafts is

Helical gear
Spur gear
Bevel gear
Spiral gear

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Theory of Machine
The Coriolis component of acceleration leads the sliding velocity by

135°
180°
45°
90°

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Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Self-closed pair
Higher pair
Force-closed pair
Lower pair

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

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

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Theory of Machine
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

18.52 N-s/m
1.4 N-s/m
529.2 N-s/m
52.92 N-s/m

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Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Parabola
Ellipse
Circle
Straight line

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