1. HVDC transmission is preferred to EHV AC because
Answer : system stability can be improved
Explanation:-
2. In a Auto transformer power is transferred through
Answer : Both conduction and induction process
Explanation:-
In auto transformer the power is transfered through both induction and conduction process but in transformer the power is transferd through only induction process
3. In a power plant, a reverse generating capacity, which is in operable condition and available for service but not in operation is called the
Answer : cold reverse
Explanation:-
4. The phase controlled rectifiers used in speed control of DC motors converts fixed AC supply voltage to________________output voltage
Answer : Variable AC
Explanation:-
5. Which of the following connection of transformer will give the highest secondary voltage
Answer : Delta primary, star secondary
Explanation:-
6. In a transformer zero Voltage regulation at full load is_________
Answer : Possible at leading Power factor load
Explanation:-
7. In a DC series motor, the torque developed is__________
Answer : Proportional to the square of the armature current
Explanation:- In DC Series motor the torque is proportional to the square of the armature current where as in DC Shunt motor the torque is proportional to the armature current only
8. Buchholz relay is_____________
Answer : Connected in the pipe connecting main tank of the transformer and the Conservator tank
Explanation:- Buchholz relay is used to detect the transformer internal faults
9. For successful parallel operation of two single phase transformers, the most essential condition is that their__________
Answer : Polarities are properly connected
Explanation:-
10. In a synchronous machine, the damping windings are used to
Answer : help in starting as a motor and to reduce hunting
Explanation:-
Damping windings are used to provide the starting torque to the synchronous machine and also to reduce hunting
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