Three sections of a feeder are provided with, circuit breaker CB1, CB2,CB3, CB4, CB5 and CB6. For a fault F as indicated in the given figure

1.  CB5 must be set to trip after CB1 trips

2.  CB5 must be set to trip after CB3 and CB4trips

3.  CB5 must be set to trip after CB2 trips

4.   CB5 must be set-to trip before CB1,CB2,CB3 and CB4 trip

View Answer  
4
Correct Answer :

CB5 must be set-to trip before CB1,CB2,CB3 and CB4 trip


Explanation :
No Explanation available for this question

The distribution system shown in the figure below is to be protected by over current system of protection For proper fault discrimination directional over current relays will be required at locations

1.  1 and 4

2.  2 and 3

3.  1, 4 and 5

4.  2, 3 and 5

View Answer  
4
Correct Answer :

2 and 3


Explanation :
No Explanation available for this question

The fault current will be

1.  2.5 p.u.

2.  2.66 p.u.

3.  1.24 p.u.

4.  2.95 p.u.

View Answer  
4
Correct Answer :

2.66 p.u.


Explanation :
No Explanation available for this question

The current in the grounding resistor is

1.  2.79 kA

2.  2.90 kA

3.  266 kA

4.  250 kA

View Answer  
4
Correct Answer :

2.79 kA


Explanation :
No Explanation available for this question

The voltage across the grounding resistor is

1.  6.6 kA

2.  2.78 kA

3.  5.59 kA

4.  10 kA

View Answer  
4
Correct Answer :

5.59 kA


Explanation :
No Explanation available for this question

The following figure shows the single line diagram of a power system with all reactances marked in per unit (p.u ) on the same base The system is on no-load when a 3-phase fault occurs at 'F' on the high voltage side of the transformer T2. The fault current will be

1.  - j 0.8187 p.u.

2.  + j 0.8187 p.u.

3.  - j 8.1871 p.u.

4.  + j 8.1871 p.u.

View Answer  
4
Correct Answer :

- j 8.1871 p.u.


Explanation :
No Explanation available for this question

Four identical 100 MVA, 22 kV generators are operating in parallel, as shown above in two bus-bar sections, interconnected through a current limiting reactor of x p.u. reactance on the generator-base: Each generator has a reactance of 0.2 p.u. The value of the reactor x to limit a symmetrical short-circuit (a-b-c) current p.u. through the circuit breaker to 1500 MVA is

1.  0.05 p.u

2.  0.10 p.u

3.  0.15 p.u

4.  0.20 p.u.

View Answer  
4
Correct Answer :

0.10 p.u


Explanation :
No Explanation available for this question

For the network shown in the given below, the zero sequence reactances in p.u are indicated. The zero sequence driving point reactance of the node 3 is

1.  0.12

2.  0.30

3.  0.10

4.  0.20

View Answer  
4
Correct Answer :

0.10


Explanation :
No Explanation available for this question

Consider the model shown in the given figure of a transmission line with a series capacitor at its point. The maximum voltage on the line is at the location

1.  P1

2.  P2

3.  P3

4.  P4

View Answer  
4
Correct Answer :

P3


Explanation :
No Explanation available for this question

A generator is connected to a transformer which feeds another transformer through a short feeder (the given figure). The zero sequence impedance values are expressed in pu on a common base and ate shown in the figure. The Thevenin equivalent zero sequence impedance at point B is

1.  0.8 +-j 0.6

2.  0.75 + j 0.22

3.  0.75 + j 0.25

4.  1.5 + j 0.25

View Answer  
4
Correct Answer :

0.75 + j 0.22


Explanation :
No Explanation available for this question
Previous Next

Interview Questions

MongoDB
Java Script
Node JS
PHP
JQuery
Python