Dynamics of Machinery (3151911) MCQs

MCQs of Balancing of Rotating Masses

Showing 11 to 16 out of 16 Questions
11.

Let the disturbing mass be 100 kg and the radius of rotation be 20 cm and the rotation speed is 50 rad/s, then calculate the centrifugal force in kN.

(a)

50

(b)

25

(c)

50000

(d)

25000

Answer:

Option (a)

12.

For the static balancing of the engine, which of the condition is necessary?

(a)

Force polygon must be close

(b)

Couple polygon must be close

(c)

Force polygon must be open

(d)

Couple polygon must be open

Answer:

Option (a)

13.

Which of the following statements are associated with the complete dynamic balancing of rotating systems?

1. Resultant couple due to all inertia forces is zero.

2. Support reactions due to forces are zero but not due to couples.

3. The system is automatically statically balanced.

4. Centre of masses of the system lies on the axis of rotation.

(a)

1, 2, 3 and 4

(b)

1, 2, and 3 only

(c)

2, 3, and 4 only

(d)

1, 3, and 4 only

Answer:

Option (d)

14.

The unbalanced primary forces in rotating parts are partially balanced

(a)

True

(b)

False

Answer:

Option (b)

15.

Cradle type balancing machine is a more sensitive machine than the pendulum type balancing machine.

(a)

True

(b)

False

Answer:

Option (a)

16.

Two correction planes (left and right) are used in Pivoted-cradle balancing machine to measure unbalance in the rotating part.

(a)

Correct

(b)

Incorrect

Answer:

Option (a)

Showing 11 to 16 out of 16 Questions