A 60 Hz, 320 km lossless line has sending end voltage 1.0 p.u. The receiving end voltage on no-load is

1.  1.1 p.u.

2.  1.088 p.u.

3.  1.116 p.u.

4.  none of these

View Answer  
4
Correct Answer :

1.088 p.u.


Explanation :
No Explanation available for this question

Resistance switching is normally employed

1.  all breakers

2.  bulk oil breakers

3.  minimum oil breakers

4.  air blast circuit breakers

View Answer  
4
Correct Answer :

air blast circuit breakers


Explanation :
No Explanation available for this question

A 100/5 A bar primary current transformer supplies an 0/C relay set at 25% pick up and it has a burden at 5 VA. The secondary voltage is

1.  1 volt

2.  1.25 volts

3.  2.5 volts

4.  4 volts

View Answer  
4
Correct Answer :

4 volts


Explanation :
No Explanation available for this question

A transformer rated for 500 kVA. 11 kv/0.4 kV has an impedance at 10% and is connected to an infinite bus. The fault level of the transformer is

1.  500 kVA

2.  5000 kVA

3.  500√3 kVA

4.  none of these

View Answer  
4
Correct Answer :

5000 kVA


Explanation :
No Explanation available for this question

If a 100V/10V, 50 VA transformer is converted to 100/110V auto transformer, then rating of the auto transformer is

1.  550 VA

2.  500 VA

3.  110 VA

4.  100 VA

View Answer  
4
Correct Answer :

550 VA


Explanation :
No Explanation available for this question

Where voltage are high and current to be interrupted is low, the breaker preferred is

1.  air blast C.B

2.  oil C.B.

3.  vacuum C.B.

4.  any of these

View Answer  
4
Correct Answer :

vacuum C.B.


Explanation :
No Explanation available for this question

If time of operation of a relay for unity TMS is 10 secs, then time of operation for 0.5 TMS will be

1.  20 secs

2.  5 secs

3.  10 sets

4.  none of these

View Answer  
4
Correct Answer :

5 secs


Explanation :
No Explanation available for this question

If fault current is 2000 amps, the relay setting 50% and C.T. ratio is 400/5, then plug setting multiplier will be

1.  25 amps

2.  15 amps

3.  50 amps

4.  none of these

View Answer  
4
Correct Answer :

none of these


Explanation :
No Explanation available for this question

A long distance overhead transmission line of 220 kV rating is to be protected against faults between phase and ground. The fault resistance including that of the ground is found to vary over a wide range. Which of the following types and relays will give the best performance under the situation indicated above

1.  Over current relay

2.  Differential relay with percentage bias

3.  Reactance type distance relay

4.  Impedance type distance relay

View Answer  
4
Correct Answer :

Reactance type distance relay


Explanation :
No Explanation available for this question

Plug setting of a relay can be altered by varying

1.  number of ampere-turns

2.  air gap of magnetic path

3.  adjustable back up stop

4.  none of these

View Answer  
4
Correct Answer :

number of ampere-turns


Explanation :
No Explanation available for this question
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