Power system MCQ #4

Power system MCQ 61 to 65:

61) Power factor can be improved by connecting _________.

      (a) Static capacitors.

      (b) Synchronous condensers.

      (c) Resistors.

      (d) Both (a) and (b).

62) What is the most economical power factor for a consumer?

      (a) 0.25 – 0.5 lagging

      (b) 0.25 – 0.5 leading

      (c) 0.85 – 0.95 lagging

      (d) 0.85 – 0.95 leading

63) What is the value of Inductive reactance in short transmission lines?

      (a) More in middle of sending end and receiving end

      (b) More at sending end

      (c) More at receiving end

      (d) Uniformly distributed over entire length

64) Voltage regulation of a transmission line should be ________

      (a) Minimum

      (b) Greater than 50 %

      (c) Maximum

      (d) Less than 50 %

65) Which of the following is like equivalent circuit of short transmission line?

      (a) Series RLC circuit

      (b) Parallel RLC circuit

      (c) Parallel RL circuit

      (d) Series RL circuit

ANSWER: | 61-d | 62-c | 63-a | 64-a | 65-d |

Power system MCQ 66 to 70:

66) In a nominal-π method the resistance of line is assumed to be __________

      (a) Distributed uniformly from sending end to receiving end

      (b) Divided into two halves

      (c) Lumped at middle of the line

      (d) Lumped at the generation end

67) Active power and apparent power are respectively represented by _________.

      (a) kW and kVAR

      (b) kW and kVA

      (c) kVA and kVAR

      (d) kVAR and kVA

68) Length of long transmission line is more than ___________

      (a) 80 Km

      (b) 50 Km

      (c) 120 Km

      (d) 200 Km

69) Range of surge impedance for an underground cable is _____________

      (a) 40 Ω – 60 Ω

      (b) 12 Ω – 144 Ω

      (c) 400 Ω – 600 Ω

      (d) 300 Ω – 900 Ω

70) The voltage rating of long transmission line is _________

      (a) 20 KV to 100 KV

      (b) Up to 20 KV

      (c) Above 100 KV

      (d) 60 KV to 80 KV

ANSWER: | 66-c | 67-b | 68-d | 69-a | 70-c |

Power system MCQ 71 to 75:

71) The leakage current through the shunt admittance is __________

      (a) Maximum at receiving end

      (b) Maximum at sending end

      (c) Uniform over length of line

      (d) Maximum at center of line

72) Impedance diagram is used for analysis of __________

      (a) Fault

      (b) Alternator

      (c) Load flow

      (d) Transmission Line

73) Single line diagram of which of the following power system is possible?

      (a) Balanced power system

      (b) Power system with LG fault

      (c) Power system with LL fault

      (d) Power system with LLG fault

74) A variable charge is based on what?

      (a) Peak load demand

      (b) Maximum demand

      (c) Energy consumption

      (d) All of the above

75) Fixed charge is dependent on what factor?

      (a) Peak load demand

      (b) Maximum demand

      (c) Energy consumption

      (d) All of the above

ANSWER: | 71-b | 72-c | 73-a | 74-c | 75-b |