If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to? 975 rpm 950 rpm 940 rpm 1000 rpm TRUE ANSWER : ? YOUR ANSWER : ?
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected through inductive coupling in parallel in series either of these depending on the design of the motor TRUE ANSWER : ? YOUR ANSWER : ?
Stability of a synchronous motor ---------- with the increase in excitation. remains unaffected decreases any of the above increases TRUE ANSWER : ? YOUR ANSWER : ?
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator? Eye bolt. Dummy coils. Commutator. Equalizer rings. TRUE ANSWER : ? YOUR ANSWER : ?
In IM the rotor lamination can be ________________ than stator laminations. sipper. thinner. thicker. rotor can not have any laminations. TRUE ANSWER : ? YOUR ANSWER : ?
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases? Increases. Remain unchanged Decreases. None of above. TRUE ANSWER : ? YOUR ANSWER : ?
The speed of a DC series motor is Proportional to field current. Proportional to the armature current. Inversely proportional to the armature current. Proportional to the square of the armature current. TRUE ANSWER : ? YOUR ANSWER : ?
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of 51.5Hz 1.5Hz 2.5Hz 48.5Hz TRUE ANSWER : ? YOUR ANSWER : ?
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency? 92% 94% 96% 95% TRUE ANSWER : ? YOUR ANSWER : ?
The constant losses in transformer is/are hysteresis loss. copper loss. eddy current loss. both 2 and 3. TRUE ANSWER : ? YOUR ANSWER : ?