The air gap between stator and rotor of 3-phase induction motor ranges from ______ 0.4 mm to 4 mm 1 cm to 2 cm 4 cm to 6 cm 2 cm to 4 cm TRUE ANSWER : ? YOUR ANSWER : ?
Less maintenance troubles are experienced in case of Slip ring induction motor Both (A) and (B) Squirrel cage induction motor None of these TRUE ANSWER : ? YOUR ANSWER : ?
A four speed squirrel cage induction motor uses______ stator windings. Two Four One Three TRUE ANSWER : ? YOUR ANSWER : ?
An induction motor is preferred to a dc motor because it _______ Has simple and rugged construction Provides fine speed control None of the listed here Provides high starting torque TRUE ANSWER : ? YOUR ANSWER : ?
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______ Open circuited Short circuited Supplying a variable resistive load None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Very large 3-phase induction motors (greater than 25 HP) are started _____ Direct on line Star-delta starting By auto transformer starting None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
The full load slip of a 3-phase induction motor ranges from 2 to 5 % None of the listed here 10 to 20 % 20 to 30 % TRUE ANSWER : ? YOUR ANSWER : ?
DOL starting of induction motors is usually restricted to High horsepower motors Variable speed motors Low horsepower motors High speed motors TRUE ANSWER : ? YOUR ANSWER : ?
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____ 1000 rpm 600 rpm 300 rpm 1200 rpm TRUE ANSWER : ? YOUR ANSWER : ?
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____ 1200 rpm 2400 rpm 400 rpm 1600 rpm TRUE ANSWER : ? YOUR ANSWER : ?