The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Theory of Machine
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Unbalanced forces are not dangerous at higher speeds

Unbalanced couples are caused only at higher speeds

Effects of unbalances are proportional to the square of the speed

Effects of unbalances are directly proportional to the speed

Unbalanced forces are not dangerous at higher speeds

Unbalanced couples are caused only at higher speeds

Effects of unbalances are proportional to the square of the speed

Effects of unbalances are directly proportional to the speed

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Theory of Machine
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

Zero

π/2

π

One

Zero

π/2

π

One

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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

The system is unbalanced

Resonance is caused due to the heavy mass of the rotor

The shafts are rotating at very high speeds

Bearing centre line coincides with the axis

The system is unbalanced

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
Creep in belt drive is due to

Uneven extensions and contractions due to varying tension

Larger size of the driver pulley

Material of the pulley

Material of the belt

Uneven extensions and contractions due to varying tension

Larger size of the driver pulley

Material of the pulley

Material of the belt

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Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Remain same

Decreases

None of these

Increases

Remain same

Decreases

None of these

Increases

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Theory of Machine
Sensitiveness of the governor is defined as the ratio of the

Difference of the maximum and minimum equilibrium speeds to the mean speed

Mean speed to the maximum equilibrium speed

Mean speed to the minimum equilibrium speed

Sum of the maximum and minimum equilibrium speeds to the mean speed

Difference of the maximum and minimum equilibrium speeds to the mean speed

Mean speed to the maximum equilibrium speed

Mean speed to the minimum equilibrium speed

Sum of the maximum and minimum equilibrium speeds to the mean speed

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Theory of Machine

Theory of Machine The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Theory of Machine When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

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

Theory of Machine Creep in belt drive is due to

Theory of Machine The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Theory of Machine Sensitiveness of the governor is defined as the ratio of the

Theory of Machine
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Theory of Machine
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

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

Theory of Machine
Creep in belt drive is due to

Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Theory of Machine
Sensitiveness of the governor is defined as the ratio of the