3 phase Induction Motor

3 phase Induction Motor

University

25 Qs

quiz-placeholder

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3 phase Induction Motor

3 phase Induction Motor

Assessment

Quiz

Education

University

Hard

Created by

Ashwini A

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25 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

While operating on variable frequency supplies, the AC motor requires variable voltage in order to

protect the insulation.

avoid effect of saturation.

improve the capabilities of the inverter.

protect thyristor from dV / dt.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 2-pole, 3-phase, ______ Hz induction motor is operating at a speed of 550 rpm. The frequency of the rotor current of the motor in Hz is 2.

9.37

9.12

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The concept of V/f control of inverters driving induction motors results in

constant torque operation

speed reversal

reduced magnetic loss

hormonic elimination

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stator voltage control for the speed control of induction motor is suitable for

Fan and Pump Drive

Drive of a crane

Running as the generator

Constant Load drive

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Objective of Rotor resistance starter is...

To limit the starting current

To control the starting torque

To vary the speed

All the above

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A wound rotor induction motor is preferred over squirrel cage induction motor when the major consideration involved is

High starting Torque

Low starting current

Speed control over the limited range

All of the above

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Wound rotor and squirrel-cage motors with the high slip which develop maximum torque at standstill are used for

Presses and Punches

Machine tools

Elevators

All of the above

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