Aux 1 Unit 15 Q7

1 / 10

What type of bearings are typically used in a three-phase induction motor with a caged rotor?

A) Magnetic bearings

C) Sleeve bearings

B) Roller or ball bearings

D) Thrust bearings

2 / 10

What is the function of the cooling fan in a caged rotor induction motor?

B) To cool the motor by forcing air over the stator and rotor, dissipating heat generated during operation

A) To increase the speed of the rotor

D) To lubricate the bearings

C) To decrease the motor's noise level

3 / 10

What is the primary purpose of the short-circuiting rings (end rings) in a caged rotor?

C) To reduce the weight of the motor

B) To connect the rotor bars electrically, forming a closed circuit that allows current to flow and produce torque when the rotor cuts through the stator's magnetic field

A) To hold the rotor in place

D) To insulate the rotor from the stator

4 / 10

What is the role of the stator core in a three-phase induction motor?

B) To provide a path for the magnetic flux, ensuring efficient operation of the motor

A) To house the rotor bars

C) To insulate the motor windings

D) To reduce the motor's operating speed

5 / 10

Which part of the three-phase induction motor is responsible for creating the rotating magnetic field?

A) The rotor

B) The stator windings

D) The cooling fan

C) The bearings

6 / 10

Why is the rotor in a caged rotor induction motor laminated?

B) To minimize eddy current losses and reduce heating within the rotor core, improving the motor's efficiency

A) To reduce weight

C) To increase the rotor's strength

D) To enhance the rotor's magnetic properties

7 / 10

Why are the rotor bars in a caged rotor induction motor often made of aluminum or copper?

B) Because these materials have high electrical conductivity, allowing efficient current flow and torque production

A) To increase the weight of the motor

C) To make the rotor more durable

D) To reduce the manufacturing cost

8 / 10

In a caged rotor induction motor, what is the rotor constructed of?

C) A series of permanent magnets

A) A laminated iron core with aluminum or copper bars embedded in it, connected at both ends by short-circuiting rings (end rings)

D) An iron core with slip rings

B) A solid copper disc

9 / 10

What material is commonly used for the core of the stator in a caged rotor induction motor?

B) Laminated steel sheets

A) Plastic

C) Copper

D) Aluminum

10 / 10

Which of the following components is a key part of the stator in a three-phase induction motor?

D) Commutator

A) Rotor bars

C) Slip rings

B) Stator windings

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