MCQ Questions and Answers on Dynamics of Machinery

Q.

Which of the following conditions should be satisfied for static balancing ?
1. Dynamic forces acting on the system should be zero
2. Couple acting on the system due to dynamic force should be zero
3. Centrifugal forces acting on the system should be zero
4. Couple acting on the system due to centrifugal forces should be zero

A. Condition 1 and condition 2

B. Condition 1 and condition 3

C. Condition 3 and condition 4

D. Condition 2 and condition 3

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.

A. B in clockwise C in anticlockwise

B. C in clockwise B in anticlockwise

C. B and C in clockwise

D. B and C in anticlockwise

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Which of the following statements is/are true primary/secondary couple? 1. Secondary couple does not act on V engine 2. Primary couple acts on V engine 3. Secondary couple acts on reciprocating masses of multi-cylinder inline engines 4. Primary couple acts on reciprocating masses of multi-cylinder inline engines

A. 1 and 2

B. 2, 3 and 4

C. 1, 3 and 4

D. All of the above

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

A flywheel is mounted on a vertical shaft. The both ends of a shaft are fixed and its diameter is 50 mm. The flywheel has a mass of 500 kg, the modulus of rigidity for the shaft material is 80 GN/m2 and its radius of gyration is 0.5 m. Find the natural frequency of torsional vibrations.

A. 5.32

B. 5.86

C. 5.65

D. 6.66

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The ratio of the intensity of sound transmitted from the boundary to the intensity of sound incident on it is called as

A. Absorption coefficient

B. Transmission coefficient

C. Reflection coefficient

D. None of these

Discuss

Answer : Option:- B

Explanation :

Transmission coefficient denotes the ratio of the intensity of sound transmitted from the boundary to the intensity of sound incident on it.

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MCQ Questions and Answers on Dynamics of Machinery

Q. In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.

Q. A flywheel is mounted on a vertical shaft. The both ends of a shaft are fixed and its diameter is 50 mm. The flywheel has a mass of 500 kg, the modulus of rigidity for the shaft material is 80 GN/m2 and its radius of gyration is 0.5 m. Find the natural frequency of torsional vibrations.

Q. The ratio of the intensity of sound transmitted from the boundary to the intensity of sound incident on it is called as

Q.

In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.

Q.

A flywheel is mounted on a vertical shaft. The both ends of a shaft are fixed and its diameter is 50 mm. The flywheel has a mass of 500 kg, the modulus of rigidity for the shaft material is 80 GN/m2 and its radius of gyration is 0.5 m. Find the natural frequency of torsional vibrations.

Q.

The ratio of the intensity of sound transmitted from the boundary to the intensity of sound incident on it is called as