The static balancing is satisfactory for low speed rotors but with increasing speeds,...

Q.

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

A. unbalance couples are caused only at higher speeds

B. unbalance forces are no dangenrous at higher speeds

C. effect of unbalances are proportional to the square of the speed

D. effect of unbalances are directly proportional to the speed

Answer & Explanation

Answer : Option: C

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Q.

When two rotors rotate in one direction and middle one rotates in opposite direction, then torsional vibration occurs with

A. Four nodes

B. Three nodes

C. Two Nodes

D. Single node

Answer & Explanation

Q.

One of the methods of vibration control is, controlling the natural frequencies of the system and ______ under excitation.

A. Introducing a damping

B. Use of vibration isolator

C. addition of vibration absorber

D. avoiding resonance

Answer & Explanation

Q.

Magnification factor is defined as the ratio of

A. Steady state amplitude and static deflection of spring

B. Steady state amplitude and zero frequency amplitude

C. Both options (1) and (2)

D. Force transmitted to support and inertia force

Answer & Explanation

Q.

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

A. one

B. two

C. three

D. four

Answer & Explanation

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The static balancing is satisfactory for low speed rotors but with increasing speeds,...

Q.

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

Start Discussion :

Comments :

More Questions Dynamics of Machinery:

Q.

When two rotors rotate in one direction and middle one rotates in opposite direction, then torsional vibration occurs with

Q.

One of the methods of vibration control is, controlling the natural frequencies of the system and ______ under excitation.

Q.

Magnification factor is defined as the ratio of

Q.

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

The static balancing is satisfactory for low speed rotors but with increasing speeds,...

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

Start Discussion :

Comments :

More Questions Dynamics of Machinery:

Q. When two rotors rotate in one direction and middle one rotates in opposite direction, then torsional vibration occurs with

Q. One of the methods of vibration control is, controlling the natural frequencies of the system and ______ under excitation.

Q. Magnification factor is defined as the ratio of

Q. The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

Q.

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

Q.

When two rotors rotate in one direction and middle one rotates in opposite direction, then torsional vibration occurs with

Q.

One of the methods of vibration control is, controlling the natural frequencies of the system and ______ under excitation.

Q.

Magnification factor is defined as the ratio of

Q.

The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is