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23RO2005 - Electrical Machines - Quiz 1

Total questions: 16

Worksheet time: 11mins

Name
Class
Date
1.

An induction motor works with

a)

AC only

b)

DC Only 

c)

Both AC & DC

d)

Neither AC nor DC

2.

The stator core of a 3-phase induction motor is laminated in order to reduce the

a)

Eddy current loss

b)

Hysteresis loss

c)

Both eddy current and hysteresis loss

d)

Weight of the stator

3.

In a 3-phase squirrel cage induction motor, rotor conductors are short circuited through

a)

end rings

b)

slip rings

c)

split rings

d)

piston rings

4.

The rotor winding of a 3-phase Induction motor derives its voltage and power from the stator winding through 

a)

Electromagnetic induction

b)

Electromagnetic interference

c)

Electromagnetic radiation

d)

Electromagnetic force

5.

Skewing of rotor slots prevents

a)

Cogging

b)

Plugging

c)

Clogging

d)

Rushing

6.

Which of the following components in an electric motor converts electrical energy into mechanical energy?

a)

Stator

b)

Rotor

c)

Commutator

d)

Armature

7.

A motor that operates both on AC and DC power sources is known as a:

a)

DC motor

b)

AC motor

c)

Universal motor

d)

Synchronous motor

8.
  1. The unit of electrical power is measured in:

a)

Ohms

b)

Volts

c)

Amperes

d)

Watts

9.
  1. What type of motor is known for its high starting torque and is commonly used in elevators and cranes?

a)

DC motor

b)

Synchronous motor

c)

Stepper motor

d)

Induction motor

10.

Which motor has high starting torque

a)

DC Series Motor

b)

DC Shunt Motor

c)

AC Motor

d)

DC Compound Motor

11.

which symbol is used to represent electrical flux?

a)

ϕ\phi  

b)

H

c)

B

d)

A

12.

Which of the following components in an electric motor converts electrical energy into mechanical energy?

a)

Stator

b)

Rotor

c)

Commutator

d)

Armature

13.

What does the thumb indicate in Fleming's left hand rule

a)

Force

b)

Current

c)

Magnetic field

d)

Voltage

14.

write the unit of magnetic flux?

a)

wbm2\frac{wb}{m^2}  

b)

wb

c)

AT

d)

AT/m

15.

Armature of the dc machine is laminated to reduce which of the following:

a)

hysteresis loss

b)

eddy current loss

c)

both eddy current loss and hysteresis loss

d)

copper loss

16.

What is the role of a capacitor in a single-phase induction motor?

a)

Increases the torque output

b)

Controls the speed of the motor

c)

Creates a phase shift between windings

d)

Regulates the voltage supply