Explore topic-wise MCQs in Machine Dynamics.

This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Dynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, then due to the centrifugal forces

A. the reaction on the inner wheels increases and on the outer wheels decreases
B. the reaction on the outer wheels increases and on the inner wheels decreases
C. the reaction on the front wheels increases and on the rear wheels decreases
D. the reaction on the rear wheels increases and on the front wheels decreases
Answer» C. the reaction on the front wheels increases and on the rear wheels decreases
Discussion
2.

A disc spinning on its axis at 20 rad/s will undergo precession when a torque 100 N-m is applied about an axis normal to it at an angular speed, if mass moment of inertia of the disc is the 1 kg-m2

A. 2 rad/s
B. 5 rad/s
C. 10 rad/s
D. 20 rad/s
Answer» C. 10 rad/s
Discussion
3.

A disc is spinning with an angular velocity? rad/s about the axis of spin. The couple applied to the disc causing precession will be

A. 1/2Iω2
B. Iω2
C. 1/2 Iω ωp
D. Iω ωp
Answer» E.
Discussion
4.

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, then due to the centrifugal force?

A. the reaction on the inner wheels increases and on the outer wheels decreases
B. the reaction on the outer wheels increases and on the inner wheels decreases
C. the reaction on the front wheels increases and on the rear wheels decreases
D. the reaction on the rear wheels increases and on the front wheels decreases
Answer» C. the reaction on the front wheels increases and on the rear wheels decreases
Discussion
5.

In an automobile, if the vehicle makes a left turn, the gyroscopic torque

A. increases the forces on the outer wheels
B. decreases the forces on the outer wheels
C. does not affect the forces on the outer wheels
D. none of the mentioned
Answer» B. decreases the forces on the outer wheels
Discussion
6.

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A. to move the ship towards port side
B. to move the ship towards star-board
C. to raise the bow and lower the stern
D. to raise the stern and lower the bow
Answer» C. to raise the bow and lower the stern
Discussion
7.

The rotor of a ship rotates in clockwise direction when viewed from the stern and the ship takes a left turn. The effect of the gyroscopic couple acting on it will be

A. to raise the bow and stern
B. to lower the bow and stern
C. to raise the bow and lower the stern
D. to lower the bow and raise the stern
Answer» D. to lower the bow and raise the stern
Discussion
8.

The air screw of an aeroplane is rotating clockwise when looking from the front. If it makes a left turn, the gyroscopic effect will

A. tend to depress the nose and raise the tail
B. tend to raise the nose and depress the tail
C. tilt the aeroplane
D. none of the mentioned
Answer» C. tilt the aeroplane
Discussion
9.

The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of the gyroscopic couple on the aeroplane will be

A. to raise the nose and dip the tail
B. to dip the nose and raise the tail
C. to raise the nose and tail
D. to dip the nose and tail
Answer» B. to dip the nose and raise the tail
Discussion
10.

A disc spinning on its axis at 20 rad/s will undergo precession when a torque 100 N-m is applied about an axis normal to it at an angular speed, if mass moment of inertia of the disc is the 1 kg-m2

A. 2 rad/s
B. 5 rad/s
C. 10 rad/s
D. 20 rad/s
Answer» C. 10 rad/s
Discussion
11.

A disc is spinning with an angular velocity ? rad/s about the axis of spin. The couple applied to the disc causing precession will be

A. 1/2Iω<sup>2</sup>
B. Iω<sup>2</sup>
C. 1/2 Iω ω<sub>p</sub>
D. Iω ω<sub>p</sub>
Answer» E.
Discussion