ISM III YEAR

ISM III YEAR

Professional Development

20 Qs

quiz-placeholder

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ISM III YEAR

ISM III YEAR

Assessment

Quiz

Education

Professional Development

Hard

Created by

PRABHU R

Used 2+ times

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 3-phase induction motor with its rotor blocked behaves similar to a _________

transformer under short circuit of secondary terminals

transformer under open circuit of secondary

synchronous motor under slip test

synchronous motor under open circuit

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Mechanically air gaps in induction motor are kept very low to avoid _________

lower power factor

lagging nature

magnetizing current

all of the mentioned

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The rotor of 3-phase slip ring induction motor is fed from a 3-phase supply with its stator winding short circuited having rotor rotating clockwise at a speed of Nr, then the _________

speed of air gap field w.r.t. stator is Ns-Nr anticlockwise

speed of air gap field w.r.t. stator is Ns-Nr clockwise

speed of airgap field w.r.t rotor is Ns clockwise

speed of airgap field w.r.t. stator is Ns-Nr clockwise

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Starters are required in the induction motor because __________

torque produced is very low at starting to overcome inertia

they are not self starting

of high starting current

all of the mentioned

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For the application requiring high starting torque and minimum starting current, the most suitable starting method will be?

Star-Delta method

DOL method

Reactance starting method

Auto transformer starting method

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 3-phase slip ring IM is has its copper bars changed by the aluminium bars in the machine. With the above change ___________

starting torque remains same

starting torque increase

starting torque decrease

maximum torque increase

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________

hysteresis effect

armature reaction

hysteresis effect and armature reaction

eddy currents

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