1) What is the formula to calculate the (kV)B on the HT section?
a. (kV) B on HT section * (HT voltage rating) / (LT voltage rating)
b. (kV) B on LT section * (HT voltage rating) / (LT voltage rating)
c. (kV) B on HT section * (LT voltage rating) / (HT voltage rating)
d. (kV) B on LT section * (LT voltage rating) / (HT voltage rating)
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Answer
Explanation
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ANSWER: (kV)B on LT section * (HT voltage rating) / (LT voltage rating)
Explanation:
No explanation is available for this question!
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2) What will be the per unit impedance of a synchronous motor having a rating of 100 kVA, 13.2 kV and having a reactance of 75 Ω / ph?
a. 0.043 pu
b. 0.057 pu
c. 0.036 pu
d. 0.298 pu
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Answer
Explanation
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ANSWER: 0.043 pu
Explanation:
No explanation is available for this question!
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3) What is the per unit impedance Z(Pu) in a three phase system?
a. ( Z * (MVA) B) / (KV) 2
b. ( 1000 * (KV) B) / √3 I B
c. ( Z * (KV) 2 ) / (MVA) B
d. None of these
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Answer
Explanation
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ANSWER: ( Z * (MVA)B) / (KV)2
Explanation:
No explanation is available for this question!
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4) Which among the following assumptions are made in the reactance diagram?
a. The neutral reactance are neglected
b. Static loads are neglected.
c. The capacitance of the transmission lines are neglected
d. Only a and c
e. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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5) What is the formula to calculate the (kV)B on the LT section?
a. (kV) B on HT section * (HT voltage rating) / (LT voltage rating)
b. (kV) B on LT section * (HT voltage rating) / (LT voltage rating)
c. (kV) B on HT section * (LT voltage rating) / (HT voltage rating)
d. (kV) B on LT section * (LT voltage rating) / (HT voltage rating)
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Answer
Explanation
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ANSWER: (kV)B on HT section * (LT voltage rating) / (HT voltage rating)
Explanation:
No explanation is available for this question!
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6) What is infinite bus in power system?
a. A large system with infinite voltage
b. A large system in which the voltage and frequency varies
c. A large system whose voltage and frequency remains constant throughout.
d. Both (a) and (b)
e. None of these
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Answer
Explanation
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ANSWER: A large system whose voltage and frequency remains constant throughout.
Explanation:
No explanation is available for this question!
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7) Which among these is the major advantage of per unit computations?
a. Per unit impedance of transformers is the same referred to either side of it.
b. For simulating steady state and transient models in the computer this method is very useful.
c. Manufactures usually specify the impedance of an apparatus in per unit system.
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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8) Which among these is the equivalent circuit for the synchronous motor?
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 a
Explanation:
No explanation is available for this question!
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9) What is the simplified diagram called, after omitting all resistances, static loads, capacitance of the transmission lines and magnetising circuit of the transformer?
a. Single line diagram
b. Resistance diagram
c. Reactance diagram
d. Both (a) and (b)
e. None of these
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Answer
Explanation
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ANSWER: Reactance diagram
Explanation:
No explanation is available for this question!
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10) What is the per unit system (PU)?
a. A ratio of actual value in any units to the base or reference value in the same units
b. A ratio of the base or reference value in any units to the actual value in the same units.
c. Ratio of the square of the actual value in any units to the square of base or the reference value in the same units
d. All of these
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Answer
Explanation
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ANSWER: A ratio of actual value in any units to the base or reference value in the same units
Explanation:
No explanation is available for this question!
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