The maximum torque of a 3-phase induction motor under running conditions is Directly proportional to rotor resistance None of the listed here inversely proportional to rotor reactance at standstill Inveresly proportional to supply voltage TRUE ANSWER : ? YOUR ANSWER : ?
DOL starting of induction motors is usually restricted to High horsepower motors High speed motors Variable speed motors Low horsepower motors TRUE ANSWER : ? YOUR ANSWER : ?
An induction motor is Self starting with high torque Self starting with low torque Self starting with zero torque Non self starting TRUE ANSWER : ? YOUR ANSWER : ?
The low power factor of induction motor is due to Stator reactance All of these Rotor leakage reactance The reactive lagging magnetizing current necessary to generate the magnetic flux TRUE ANSWER : ? YOUR ANSWER : ?
The shape of the torque/slip curve of induction motor is Rectangular parabola Straight line Parabola Hyperbola TRUE ANSWER : ? YOUR ANSWER : ?
If the frequency of 3-phase supply to the stator of a 3-phase induction motor is increased, then synchronous speed ______ Is decreased Remains unchanged Is increased None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
The air gap between stator and rotor of 3-phase induction motor ranges from ______ 4 cm to 6 cm 0.4 mm to 4 mm 2 cm to 4 cm 1 cm to 2 cm TRUE ANSWER : ? YOUR ANSWER : ?
The maximum torque in an induction motor depends on Rotor inductive reactance Square of supply voltage All of the listed here Frequency TRUE ANSWER : ? YOUR ANSWER : ?
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______ None of the listed here 1-S S-1 1+S TRUE ANSWER : ? YOUR ANSWER : ?
If the rotor slots are made deeper, rotor resistance is ______ None of the listed here Increased at starting Increased under running conditions Decreased at starting TRUE ANSWER : ? YOUR ANSWER : ?