1. In a centre tap full wave rectifier, 100v is the peak voltage between the centre tap and one end of the secondary. What is the maximum voltage across the reverse biased diode?
Answer : A. 200v
Explanation:-
2. The principle of operation of a 3-phase induction motor is almost similar to that of
Answer : transformer with a shorted secondary
Explanation:-
3. A 250v DC generator is run at rated speed with no excitation. The open circuit voltage will be
Answer : about 2-3v
Explanation:- small voltage is appeared across its terminals due to residual magnetism of magnets
4. The earth wire should be ______
Answer : good conductor and mechanically strong
Explanation:-
5. Hollow conductors are used in transmission lines to _______
Answer : C. reduce corona
Explanation:-
6. 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 : C. cold reverse
Explanation:-
7. Unit of Reactive power is _______
Answer : C. VAR
Explanation:-
8. In a synchronous machine, damper windings are used to _______
Answer : C. help in starting as a motor and to reduce hunting
Explanation:-
9. AC Voltage regulators are widely used in ______
Answer : B. fan drives
Explanation:-
10. The AND function can be realized by using only n number of NOR gates. What is n equal to
Answer : B. 3
Explanation:-
| S.no | Gates | Number of NAND Gates Required | Number of NOR Gates Required |
|---|---|---|---|
| 1 | NOT | 1 | 1 |
| 2 | AND | 2 | 3 |
| 3 | OR | 3 | 2 |
| 4 | EX-OR | 4 | 5 |
| 5 | EX-NOR | 5 | 4 |
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