If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______ None of the listed here No load current is decreased Leakage reactances are decreased Leakage reactances are increased TRUE ANSWER : ? YOUR ANSWER : ?
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____ 60 Hz 50 Hz None of the listed here 25 Hz TRUE ANSWER : ? YOUR ANSWER : ?
Insertion of resistance in the rotor of an induction motor to develop a given torque Increases the rotor current Rotor current remains same Decreases the rotor current Rotor current becomes zero TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following component is usually fabricated out of silicon steel? Bearings Shaft Stator core None of these TRUE ANSWER : ? YOUR ANSWER : ?
The maximum torque in an induction motor depends on All of the listed here Square of supply voltage Frequency Rotor inductive reactance TRUE ANSWER : ? YOUR ANSWER : ?
For higher efficiency of 3-phase induction motor, the slip should be As small as possible 1 Very large Large TRUE ANSWER : ? YOUR ANSWER : ?
Friction and windage loss of a 3 phase induction motor are Maximum at no load Remains the same at all loads None of the listed here Minimum at no load TRUE ANSWER : ? YOUR ANSWER : ?
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____ 600 rpm 1200 rpm 1000 rpm 300 rpm TRUE ANSWER : ? YOUR ANSWER : ?
The shaft of induction motor is made of Any of the listed here Hollow Flexible Stiff TRUE ANSWER : ? YOUR ANSWER : ?
The power factor of an induction motor under no load conditions will be closer to 0.5 leading Unity 0.2 lagging 0.2 leading TRUE ANSWER : ? YOUR ANSWER : ?