1) On which among the following factors does the magnitude of the fault current depend?
a. Total impedance upto the fault.
b. Voltage at the fault point
c. Both (a) and (b)
d. None of these
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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2) Which among the following methods are generally used for the calculation of symmetrical faults?
a. Norton theorem
b. Thevnin’s theorem
c. Kirchhoff’s laws
d. Only (b) and (c)
e. All of these
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Answer
Explanation
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ANSWER: Only (b) and (c)
Explanation:
No explanation is available for this question!
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3) In which portion of the transmission system is the occurrence of the fault more common?
a. Alternators
b. Transformers
c. Transmission lines
d. Underground cables
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Answer
Explanation
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ANSWER: Transmission lines
Explanation:
No explanation is available for this question!
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4) Which among the following curves represents the curve for transient current?
a. Only a
b. Only b
c. Only c
d. Only d
e. None of these
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Answer
Explanation
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ANSWER: Only b
Explanation:
No explanation is available for this question!
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5) Which among these is the most severe fault?
a. Single line to ground fault.
b. Double line to ground fault
c. Line to line fault
d. Symmetrical fault.
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Answer
Explanation
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ANSWER: Symmetrical fault.
Explanation:
No explanation is available for this question!
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6) Which among the following reactance have a greater value?
a. Sub transient reactance
b. Transient reactance
c. Synchronous reactance
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: Synchronous reactance
Explanation:
No explanation is available for this question!
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7) What is the expression for the symmetrical short circuit current? If the total short circuit current consists of two parts namely symmetrical short circuit current and DC offset current.
a. (V m / Z) * sin (ω + αt - θ)
b. (V m / Z) * sin (ωt + α - θ)
c. (V m * Z) * sin (ωt + αt - θ)
d. (V / Z m) * sin (ωt + α - θ)
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Answer
Explanation
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ANSWER: (Vm / Z) * sin (ωt + α - θ)
Explanation:
No explanation is available for this question!
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8) Which among these is the most commonly occurring fault?
a. Single line to ground fault.
b. Double line to ground fault
c. Line to line fault
d. Fault due to all the three phases to earth.
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Answer
Explanation
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ANSWER: Single line to ground fault.
Explanation:
No explanation is available for this question!
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9) Which of the following fault results into a three phase faults?
a. Single line to ground fault.
b. Double line to ground fault
c. Line to line fault
d. Fault due to all the three phases to earth.
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Answer
Explanation
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ANSWER: Fault due to all the three phases to earth.
Explanation:
No explanation is available for this question!
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