Q.

Consider the following statements for completely balancing a single rotating mass:
1. Another rotating mass placed diametrically opposite in the same plane balances the unbalanced mass.
2.Another rotating mass placed diametrically opposite in a parallel plane balances the unbalanced mass.
3.Two masses placed in different planes balance the unbalanced mass.
Which of the above statement is/are correct?

A. 1 only

B. 1 and 2

C. 2 and 3

D. 1 and 3

Answer & Explanation

Answer : Option: B

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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

Answer & Explanation

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

Answer & Explanation

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

Answer & Explanation

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

Answer & Explanation

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Consider the following statements for completely balancing a single rotating mass: <br>1. Another...

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More Questions 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.

Consider the following statements for completely balancing a single rotating mass: <br>1. Another...

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More Questions 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.

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.