Cogging and crawling are phenomena associated with the former during starting and the latter at a fraction of its rated speed. the former at a fraction of its rate speed and the latter during starting. any of the above. cage induction machines and they are essentially the same. TRUE ANSWER : ? YOUR ANSWER : ?
The induction motor shaft is made of mild steel. aluminium. cast iron. stainless steel. TRUE ANSWER : ? YOUR ANSWER : ?
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW 33.33 MW and 66.67 MW respectively 50 MW and 50 MW respectively 66.67 MW and 33.33 MW respectively any of the above TRUE ANSWER : ? YOUR ANSWER : ?
In synchronous generator V curve is drawn between either of these. field current on X-axis and power factor on Y-axis. field current on X-axis and armature current on Y-axis. field current on Y-axis and armature current on X-axis. TRUE ANSWER : ? YOUR ANSWER : ?
In a DC generator sparking between brushes and commutator surface may be due to too rapid reversal of current. any of the above. under commutation. over commutation. TRUE ANSWER : ? YOUR ANSWER : ?
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to 45°. 0°. 75°. 30°. TRUE ANSWER : ? YOUR ANSWER : ?
In case of a conductively compensated DC series motor, the compensating winding is provided In series with the armature winding. In parallel with the armature winding. In parallel with the field winding. As a separate unit. TRUE ANSWER : ? YOUR ANSWER : ?
Series generators are used in which of the following applications? Air crafts. All of these Arc welding. Used as boosters in dc distribution or transmission. TRUE ANSWER : ? YOUR ANSWER : ?
If the back emf in DC motor vanishes suddenly the motor will burn. run at very high speed. run at very low speed. start haunting. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following will vary the maximum torque? rotor resistance R both 1 and 2 rotor reactance X None of these TRUE ANSWER : ? YOUR ANSWER : ?