MCQ Questions and Answers on Theory of Machines

Q.

If µ is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being 2α, the virtual coefficient of friction will be

A. µ/sin(α)

B. µ/cos(α)

C. µsin(α)

D. µcos(α)

Answer : Option:- A

Explanation :

If µ is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being 2α, the virtual coefficient of friction will be
=µ/sin(α)

Q.

Centrifugal tension in belts is

A. Useful because it maintains some tension even when no power is transmitted

B. Not harmful because it does not take part in power transmission

C. Harmful because it increases belt tension and reduces power transmitted

D. A hypothetical phenomenon and does not actually exist in belts

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The creep in a belt drive is due to the

A. Material of the pulleys

B. Material of the belt

C. Unequal size of the pulleys

D. Unequal tension on tight and slack sides of the belt

Discuss

Answer : Option:- D

Explanation :

The creep in a belt drive is due to the unequal tension on tight and slack sides of the belt.

Q.

In case of belt drives, the effect of the centrifugal tension is to

A. Cause the belt to leave the pulley and increase the power to be transmitted

B. Cause the belts to stay on the pulley and increase the power to be transmitted

C. Reduce the driving power of the belt

D. Stretch the belt in longitudinal direction

Discuss

Answer : Option:- C

Explanation :

In belt drives, the power transmitted is reduced if centrifugal effect is considered for given value of tension

Q.

Which one of the following statements relating to belt drives is correct?

A. The rotational speeds of the pulleys are directly proportional to their diameters

B. The length of the crossed belt increases as the sum of the diameters of the pulleys increases

C. The crowning of the pulleys is done to make the drive sturdy

D. The slip increases the velocity ratio

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The controlling force curve of an spring loaded governor is given by F = ar−c where r is the radius of rotation of the governor balls, and a and c are constants. The governor is

A. Stable

B. Unstable

C. Isochronous

D. Insensitive

Discuss

Answer : Option:- A

Explanation :

The controlling force curve is passing through r in the positive axis, therefore, the governor is stable.

Q.

A Hartnell governor is a governor of

A. Inertia type

B. Pendulum type

C. Centrifugal type

D. Dead weight type

Discuss

Answer : Option:- C

Explanation :

In Hartnell governor, the centrifugal forces acting on the balls is used to control the speed.

Q.

A governor is said to be isochronous when the equilibrium speed for all radii or rotation the balls within the working range

A. Is not constant

B. Is constant

C. Varies uniformly

D. Has uniform acceleration

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

A Hartnell governor has its controlling force F given by F = p+qr where r is the radius of balls and p and q are constants. The governor becomes isochronous when

A. P = 0 and q is positive

B. P is positive and q = 0

C. P is negative and q is positive

D. P is positive and q is also positive

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

A spring loaded governor is found unstable. It can be made stable by

A. Increasing the spring stiffness

B. Decreasing the spring stiffness

C. Increasing the ball weight

D. Decreasing the ball weight

Discuss

Answer : Option:- B

Explanation :

Discuss here! No Explaination Available for These Question.

« Previous
...
2
3
4
5
6
7
8
9
10
11
12
Next »

MCQ Questions and Answers on Theory of Machines

Q. If µ is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being 2α, the virtual coefficient of friction will be

Q. Centrifugal tension in belts is

Q. The creep in a belt drive is due to the

Q. In case of belt drives, the effect of the centrifugal tension is to

Q. Which one of the following statements relating to belt drives is correct?

Q. The controlling force curve of an spring loaded governor is given by F = ar−c where r is the radius of rotation of the governor balls, and a and c are constants. The governor is

Q. A Hartnell governor is a governor of

Q. A governor is said to be isochronous when the equilibrium speed for all radii or rotation the balls within the working range

Q. A Hartnell governor has its controlling force F given by F = p+qr where r is the radius of balls and p and q are constants. The governor becomes isochronous when

Q. A spring loaded governor is found unstable. It can be made stable by

Q.

If µ is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being 2α, the virtual coefficient of friction will be

Q.

Centrifugal tension in belts is

Q.

The creep in a belt drive is due to the

Q.

In case of belt drives, the effect of the centrifugal tension is to

Q.

Which one of the following statements relating to belt drives is correct?

Q.

The controlling force curve of an spring loaded governor is given by F = ar−c where r is the radius of rotation of the governor balls, and a and c are constants. The governor is

Q.

A Hartnell governor is a governor of

Q.

A governor is said to be isochronous when the equilibrium speed for all radii or rotation the balls within the working range

Q.

A Hartnell governor has its controlling force F given by F = p+qr where r is the radius of balls and p and q are constants. The governor becomes isochronous when

Q.

A spring loaded governor is found unstable. It can be made stable by