1. Why we use Y connection in alternator?
2. For the following circuit prove that,
3. What is the maximum efficiencyof 100 KVA transformer if core
loss is 900W and full load copper loss is 1600W.
4. A battery is having 100Ah capacity and 25% charge. If 10A load
is connected for 6 hours then what is the final condition of the battery?
5. Differentiate between diode rectifier and thyristor rectifier.
6. What is biasing? Write down it’s significance.
7. What is back emf ? Write down it’s significance.
8. If per primary winding voltage is 1V then what will be the per
secondary voltage?
9. Why transformer is rated in KVA?
10. What is Ferranti effect?
11. When quality factor α = 100, C = 10pF, Then R=?
12. Define Real power, Reactive power and Apparent power.
13. Without power factor meter, how can we measure the power factor
of a circuit?
14. Why impedance is greater in AC rather than in DC?
15. We have 100A dc and 100A ac. Which will produce high heat and
why?
16. What would be the minimum applied voltage at AB point?
18. Draw the circuit diagram of florescent and
incandescent lamp.
19. When speed = 950rpm, pole = 6, f=50Hz then slip = ?
20. Why glass insulators are more used than porcelain
insulators?
21. What are theadvantages of underground cable ?
22. Why low voltage side is short circuited in short circuit
test?
No comments:
Post a Comment