1) What is the value of zero sequence impedance in line to line faults?
a. Z 0 = 1
b. Z 0 = ∞
c. Z 0 = 3 Z n
d. Z 0 = 0
|
Answer
Explanation
|
ANSWER: Z0 = 0
Explanation:
No explanation is available for this question!
|
|
2) What percentage of fault occurring in the power system is line to line fault?
a. 5 %
b. 30 %
c. 25 %
d. 15 %
|
Answer
Explanation
|
ANSWER: 15 %
Explanation:
No explanation is available for this question!
|
|
3) Which among these is the connection diagram for line to line faults?
a. Only a
b. Only b
c. Only c
d. Only d
e. None of these
|
Answer
Explanation
|
ANSWER: Only c
Explanation:
No explanation is available for this question!
|
|
4) What is the expression for fault current in line to line fault?
a. I f = √3 * (E a / Z 1 + Z 2)
b. I f = 3 * (E a / Z 1 + Z 2)
c. I f = √3 * (E a / Z 1 + Z 2 + Z 0)
d. I f = 3 * (E a / Z 1 + Z 2 + Z 0)
|
Answer
Explanation
|
ANSWER: If = √3 * (Ea / Z1 + Z2)
Explanation:
No explanation is available for this question!
|
|
5) What will be the sum of (IB + IY) in case of line to line fault, if the fault is occurring in the B and Y lines?
a. ∞
b. 0
c. 1
d. I R
|
Answer
Explanation
|
ANSWER: 0
Explanation:
No explanation is available for this question!
|
|
6) What happens to the value of the fault current in case of SLG fault, if fault impedance is introduced?
a. The fault current increase
b. The fault current remains same as in case of SLG fault.
c. The fault current becomes zero
d. The fault current is reduced
|
Answer
Explanation
|
ANSWER: The fault current is reduced
Explanation:
No explanation is available for this question!
|
|
7) What happens if the neutral is not grounded in case of the single line to ground fault?
a. Only the zero sequence impedance will be zero
b. The zero sequence impedance will be infinite
c. Fault current will be zero
d. Both (b) and (c)
e. All of these
|
Answer
Explanation
|
ANSWER: Both (b) and (c)
Explanation:
No explanation is available for this question!
|
|
8) Which among these is the connection diagram, in case of single line to ground fault?
a. Only a
b. Only b
c. Only c
d. Only d
e. None of these
|
Answer
Explanation
|
ANSWER: Only a
Explanation:
No explanation is available for this question!
|
|
9) What is the value of fault current If , in case of SLG fault?
a. 3 * (E a / Z 1 + Z 2 + Z 0)
b. 2 * (E a / Z 1 + Z 0)
c. 3 * (E a / Z 1 + Z 2 )
d. 2 * (E a / Z 1 + Z 2 + Z 0)
|
Answer
Explanation
|
ANSWER: 3 * (Ea / Z1 + Z2 + Z0)
Explanation:
No explanation is available for this question!
|
|
10) What are the terminal conditions in case of SLG fault, if the fault occurs in the phase A?
a. V b = 0, I a = 0, I c = 0
b. V a = 0, I b = 0, I c = 0
c. V a = 0, I a = 0, I c = 0
d. V b = 0, I a = 0, I b = 0
|
Answer
Explanation
|
ANSWER: Va = 0, Ib = 0, Ic = 0
Explanation:
No explanation is available for this question!
|
|
