# Power Systems Questions and Answers – Inductance of Composite Conductor Lines – 1

This set of Power Systems Multiple Choice Questions & Answers (MCQs) focuses on “Inductance of Composite Conductor Lines – 1”.

1. Consider the figure as shown below:-

The line capacitance will be given by __________________

Explanation: For the given configuration,

2. Consider the figure as shown below:-

The phase capacitance will be given by ____________

Explanation: For the given configuration,

3. The per unit value of any quantity is usually given by _____________
a) (The actual value in any units)/(The base base value in same in same units)
b) (The base base value in same in same units)/(The actual value in any units)
c) The actual value in any units* The actual value in any units
d) 1/(The base base value)

Explanation: The per unit value is given as (The actual value in any units)/(The base base value in same in same units).

4. If Xa is the armature reactance of a synchronous machine and Xl is the leakage reactance of the same machine, then the synchronous reactance is ____________
a) Xa+Xl
b) ½(Xa)
c) 1/2(Xa+Xl)
d) None of the mentioned

Explanation: Xs = Xa+Xl
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5. A large bus system whose voltage and frequency remain constant independent of the power exchange between the synchronous machine and the bus is called ________________
a) infinite bus
c) generator bus
d) cannot be determined

Explanation: It is infinite bus.

6. The power delivered by a synchronous generator to an infinite bus is given by ______

Explanation:

7. In a three phase system the three-phase fault MVA is always higher than the LG fault MVA at a bus.
a) True
b) False

Explanation: Yes, at the bus three phase system the three-phase fault MVA is always higher than the LG fault.

8. The charging current of a 400 kV is _____ that of 220 kV line of the same length.
a) more than
b) less than
c) equal to
d) none of the mentioned

Explanation: Line charging current is proportional to voltage.

9. Voltage regulation in the power system is __________
a) rise in voltage at receiving end
b) dip in voltage at receiving end
c) rise in voltage at sending end
d) dip in voltage at sending end

Explanation: VR is rise in voltage at receiving end for a transmission line.

10. Voltage regulation becomes negative for a ______load.
b) lagging
c) zero power factor
d) unity power factor

Explanation: VR will be negative for a leading load at a receiving end.

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