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Electric Machines Quiz

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

What type of motors have a constant speed proportional to the frequency of the network?

a)

Induction Motors

b)

Universal Motors

c)

Synchronous Motors

d)

Asynchronous Motors

2.

What is the difference between the motor speed and synchronous speed called?

a)

Efficiency

b)

Power

c)

Torque

d)

Slip

3.

What type of rotor is commonly known as a 'squirrel cage'?

a)

Salient Pole Rotor

b)

Squirrel Cage Rotor

c)

Wound Rotor

d)

Permanent Magnet Rotor

4.

Which type of motor is most widely used in industry due to its robustness?

a)

Stepper Motors

b)

Synchronous Motors

c)

Induction Motors

d)

Servo Motors

5.

What is the main characteristic of a synchronous motor?

a)

Speed is constant

b)

Speed varies with load

c)

Speed is always zero

d)

Speed is always high

6.

What is the purpose of the stator in an electric machine?

a)

To create a magnetic field

b)

To rotate

c)

To provide power

d)

To cool the motor

7.

What type of current is essential for the operation of electric machines?

a)

Pulsating Current

b)

Alternating Current

c)

Static Current

d)

Direct Current

8.

What does the efficiency of a motor measure?

a)

Size of the motor

b)

Speed of the motor

c)

Weight of the motor

d)

Power output vs power input

9.

What is a key benefit of high-efficiency motors?

a)

Larger size

b)

Reduced energy costs

c)

Higher noise levels

d)

Increased energy consumption

10.

What is the role of lubrication in motor maintenance?

a)

To increase friction

b)

To add weight

c)

To reduce friction

d)

To cool the motor

11.

What is the main function of the rotor in an electric machine?

a)

To create a magnetic field

b)

To rotate and produce torque

c)

To connect to the power supply

d)

To cool the machine

12.

What is the purpose of regular inspection in motor maintenance?

a)

To increase power

b)

To avoid premature failures

c)

To make the motor heavier

d)

To change the motor type

13.

What is the main principle behind electromagnetic induction?

a)

Movement of magnets

b)

Change in magnetic field induces current

c)

Static electricity

d)

Heat generation

14.

What type of electric machine uses a wound rotor?

a)

Stepper Motor

b)

Universal Motor

c)

Induction Motor

d)

Synchronous Motor

15.

What is a common application of electric machines in transportation?

a)

Heating systems

b)

Television sets

c)

Electric vehicles

d)

Cooking appliances