| 1. | Which of the following circuit breakers has high reliability and minimum maintenance ? | |
|
Vacuum circuit breakers
|
||
|
Air blast circuit breakers
|
||
|
Circuit breaker with SF6 gas
|
||
|
Oil circuit breakers
|
||
View Answer
Discuss in Forum
Report Question| 2. | Shunt capacitance is neglected while considering ? | |
|
medium transmission line
|
||
|
short transmission line
|
||
|
long transmission line
|
||
|
medium and long transmission lines
|
||
| 3. | Series-capacitors are used to ? | |
|
improve line voltage
|
||
|
compensate for line inductive reactance
|
||
|
none of the above
|
||
|
compensate for line capacitive reactance
|
||
| 4. | A differential relay responds to ? | |
|
algebraic difference between two electrical quantities
|
||
|
algebraic difference between two currents
|
||
|
vector difference between two electrical quantities
|
||
|
algebraic difference between two voltages
|
||
| 5. | The use of oil immersed reactors is generally restricted upto ? | |
|
33 kV
|
||
|
22 kV
|
||
|
11 kV
|
||
|
normally no restriction of voltage
|
||
| 6. | Outdoor switchgear is generally used for voltage beyond ? | |
|
132 kV
|
||
|
66 kV
|
||
|
11 kV
|
||
|
33 kV
|
||
| 7. | The most serious result of a major uncleared short-circuit fault could be ? | |
|
heavy current in neutral
|
||
|
blowing off of fuse
|
||
|
fire
|
||
|
deterioration of insulation
|
||
| 8. | The main factor, in favour of the use of aluminium as bus-bar material is its ? | |
|
high resistivity
|
||
|
low cost
|
||
|
low melting point
|
||
|
low density
|
||
| 9. | Switching over voltages arc more hazardous than lightning surges in case of ? | |
|
unbalanced systems
|
||
|
11 kV systems
|
||
|
HV and UHV svstems
|
||
|
low voltages
|
||
| 10. | The over-voltage surges in power systems maybe caused by ? | |
|
lightning
|
||
|
switching
|
||
|
resonance
|
||
|
Any of the above
|
||