| 1. | A fuse wire possesses ? | |
|
direct time characteristics
|
||
|
inverse time characteristics
|
||
|
either of the above
|
||
|
none of the above
|
||
View Answer
Discuss in Forum
Report Question| 2. | Minimum arcing voltage will be least in case of ? | |
|
silver
|
||
|
graphite
|
||
|
carbon
|
||
|
tungsten
|
||
| 3. | Air used in air blast circuit breaker ? | |
|
must be free from moisture
|
||
|
must have least CO2
|
||
|
must be ionized
|
||
|
must have oil mist
|
||
| 4. | The rating of a circuit breaker is generally determined on the basis of ? | |
|
line -to-line fault current
|
||
|
symmetrical fault current
|
||
|
single line to ground fault current
|
||
|
double line to ground fault current
|
||
| 5. | Arc in a circuit breaker is interrupted at ? | |
|
zero current
|
||
|
maximum current
|
||
|
minimum voltage
|
||
|
maximum voltage
|
||
| 6. | Which of the following is not a part of the circuit breaker ? | |
|
Operating mechanism
|
||
|
Conservator
|
||
|
Explosion pot
|
||
|
Fixed and moving contacts
|
||
| 7. | BuchholZ relay cannot be used on ? | |
|
three phase transformers
|
||
|
air cooled transformers
|
||
|
500 kV transformers
|
||
|
1000 kV transformers
|
||
| 8. | Current limiting reactors may be ? | |
|
air cooled air cored
|
||
|
oil immersed magnetically shielded
|
||
|
oil immersed non-magnetically shielded
|
||
|
any of the above
|
||
| 9. | A balanced 3-phase system consists of ? | |
|
zero sequence currents only
|
||
|
positive sequence currents only
|
||
|
negative and zero sequence currents
|
||
|
zero, negative and positive sequence currents
|
||
| 10. | H.R.C. fuses provide best protection in case of ? | |
|
overloads
|
||
|
open circuits
|
||
|
short-circuits
|
||
|
none of the above
|
||