The speed of stator rotating magnetic field (RMF) with respect to rotor is Zero S.Ns Ns Nr TRUE ANSWER : ? YOUR ANSWER : ?
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is synchronous generator. asynchronous generator. synchronous motor. asynchronous motor. TRUE ANSWER : ? YOUR ANSWER : ?
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed? Zero 16.55 Nm 15.28 Nm 15.6 Nm TRUE ANSWER : ? YOUR ANSWER : ?
On which of the following factor/factors the speed of a DC motor depends upon? Field flux. Applied voltage. All of these. Armature current. TRUE ANSWER : ? YOUR ANSWER : ?
No load primary current in a transformer leads the applied voltage somewhat less than 90Ã& lags behind applied voltage by exactly 90Â&am lags behind applied voltage somewhat less than 90à leads the applied voltage by exactly 90Â& TRUE ANSWER : ? YOUR ANSWER : ?
When pure inductive load is connected to the alternator, what is the effect of armature reaction? None of these Cross magnetization Magnetization Demagnetization TRUE ANSWER : ? YOUR ANSWER : ?
In a star - delta starting of an IM line voltage is 57.7 % of stator voltage. applied voltage per stator phase is 57.7 % of a line volt resistance is inserted in the rotor. reduced voltage is applied to the stator. TRUE ANSWER : ? YOUR ANSWER : ?
Universal motor have which of the following application? Lift. Traction. Domestic pump. Food mixer. TRUE ANSWER : ? YOUR ANSWER : ?
Ideal value of voltage regulation of a device is? 0 a finite negative value a positive finite value ∞ TRUE ANSWER : ? YOUR ANSWER : ?
The principle of operation of a 3 - Φ induction motor is almost similar to that of repulsion start induction motor. synchronous motor. capacitor start induction motor. transformer with secondary short circuited. TRUE ANSWER : ? YOUR ANSWER : ?