Question:

What is the relationship between torque and speed in constant type loads?

A.

Torque is independent of speed

B.

Torque linearly increases with increase in speed

C.

Torque non-linearly increases with an increase in speed

D.

Torque non-linearly decreases with an increase in speed

Answer» a. Torque is independent of speed

Question:

Fan type of loads exhibits which type of load torque characteristics?

A.

Constant torque characteristics

B.

Linearly rising torque characteristics

C.

Non-Linearly rising torque characteristics

D.

Non-Linearly decreasing torque characteristics

Answer» c. Non-Linearly rising torque characteristics

Question:

Regenerative braking mode can be achieved in which quadrant (V-I curve)?

A.

Third

B.

Second

C.

Fourth

D.

First

Answer» b. Second

Question:

Reverse motoring mode is available in fourth quadrant.

A.

True

B.

False

C.

none

D.

all

Answer» a. True

Question:

Which one is an example of variable loss?

A.

Windage loss

B.

Hysteresis loss

C.

Armature copper loss

D.

Friction loss

Answer» c. Armature copper loss

Question:

The motor commonly used in computers and digital systems is

A.

dc shunt motor

B.

Induction motor

C.

Stepper motor

D.

Synchronous motor.

Answer» b. Induction motor

Question:

The equilibrium speed of a motor load system is obtained

A.

when motor torque equals the load torque

B.

when motor torque is less than the load torque

C.

when motor torque is more than the load torque

D.

none of the these.

Answer» a. when motor torque equals the load torque

Question:

Load torques can be classified into how many types?

A.

Three

B.

Two

C.

Four

D.

Five

Answer» b. Two

Question:

Effect of friction torque is more pronounced

A.

when the drive is running on full speed

B.

when the drive is being started

C.

when the drive is being stopped

D.

when the drive at half of its normal speed.

Answer» b. when the drive is being started

Question:

Torque inversely varies with the speed in the windage load torque component.

A.

True

B.

False

C.

none

D.

all

Answer» b. False