What is the highest possible speed of turbo alternators? 3000 rpm 1500 rpm 4000 rpm 1000 rpm TRUE ANSWER : ? YOUR ANSWER : ?
If the field winding connection of DC shunt motor is changed It will run in opposite direction. motor will become slow. It will run in same direction. motor will not run. TRUE ANSWER : ? YOUR ANSWER : ?
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is 8. 32. 4. 16. TRUE ANSWER : ? YOUR ANSWER : ?
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is 200 V. 115 V. 460 V. 230 V. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following DC Motor requires 3 point starter? Shunt motor. Shunt motor as well as compound motors. Series motor. Shunt, compound and series motor. TRUE ANSWER : ? YOUR ANSWER : ?
Ward-Leonard system for controlling the speed of a DC motor is used where Very fine speed control over the whole range from zero to normal speed is required. The speed in both the direction is required. All of above. The accuracy in speed control is required. TRUE ANSWER : ? YOUR ANSWER : ?
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be less than 6 V more than 6 V 6 V zero TRUE ANSWER : ? YOUR ANSWER : ?
If the temperature of armature resistance is increased, the speed of a series motor would not change. None of above. decrease. increase. TRUE ANSWER : ? YOUR ANSWER : ?
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ? PZL/4Sp² PZL/ 4Sa PZL/4Sa² PZL/4S TRUE ANSWER : ? YOUR ANSWER : ?
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be 25 kW. 24.11 kW. 26.21 kW. 23.06 kW. TRUE ANSWER : ? YOUR ANSWER : ?