Wave winding is prefered for which of the following rating? high current and high voltage low current and high voltage low current and low voltage high current and low voltage TRUE ANSWER : ? YOUR ANSWER : ?
No load primary current in a transformer lags behind applied voltage by exactly 90Â&am lags behind applied voltage somewhat less than 90à leads the applied voltage by exactly 90Â& leads the applied voltage somewhat less than 90Ã& TRUE ANSWER : ? YOUR ANSWER : ?
A single-winding single-phase motor has starting torque equal to full-load torque. zero starting torque. low starting torque. high starting torque. TRUE ANSWER : ? YOUR ANSWER : ?
In field flux method speed control of DC Motor is constant power drive above base speed. constant hp drive below the base speed. constant torque drive above the base speed. constant torque drive below the base speed. TRUE ANSWER : ? YOUR ANSWER : ?
If a DC motor is connected across the AC supply it will Burn. Not run. Run at normal speed. Run at lower speed. TRUE ANSWER : ? YOUR ANSWER : ?
Variation in speed by ward-Leonard control of DC motors occurs due to variation in Field excitaion. Supply voltage. Armature voltage. Armature current. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following motor is more expensive for same KW output rating ? Induction motor. DC Shunt Motor Synchronous motor. AC single phase motor. TRUE ANSWER : ? YOUR ANSWER : ?
Sparkless commutation can be achieved by employing any one or more of the above methods. inter poles. high resistance carbon brushes. compensating winding. TRUE ANSWER : ? YOUR ANSWER : ?
Voltage regulation of transformer is given by (E2 - V2) / E2 (V2 - E2) / E2 (E2 - V2) / V2 (V2 - E2) / V2 TRUE ANSWER : ? YOUR ANSWER : ?
In DC machines, the interpoles are provided both (B) and (C). to counteract demagnetizing effect of armature mmf in commutating zone. to counteract the reactance voltage and the cross-magnetizi to make commutation spark less. TRUE ANSWER : ? YOUR ANSWER : ?