power system mcq

Power System MCQ

1.The charging current in a transmission line
  1. Lags the voltage by 900
  2. Leads the voltage by 450
  3. Leads the voltage by 900
  4. Leads the voltage by 1800
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Answer: 3

2. As the transmission voltage increases, the percentage resistance drop
  1. Increase
  2. Decrease
  3. Remain same
  4. None

Answer: 2

3. The coefficient of reflection for current for current for an open ended line is
  1. 1
  2. 0.5
  3. -1
  4. 0

Answer: 3

4. Ferranti effect on long overhead line is experienced when it is
  1. Lightly loaded
  2. On full load at upf
  3. On full load at 0.8pf
  4. On full load at zfp

Answer: 1

5. For an overhead line, the surge impedance in taken as
  1. 40 ohm
  2. 80 ohm
  3. 100 ohm
  4. 400 ohm

Answer: 4

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Series & parallel connections of Resistance

6. For a good voltage profile under no load conditions a long line needs,
  1. Shunt capacitors at receiving end
  2. Shunt reactors at receiving end
  3. Shunt resistance at receiving end
  4. Shunt capacitor at sending end

Answer: 2

7. Corona loss is on hilly areas than as plains areas
  1. less
  2. Same
  3. more
  4. None

Answer: 3

8. In any transmission line, AD-BC=
  1. 1
  2. 0
  3. -1
  4. 2

Answer: 1

9. If the p.f of load decrease, the line losses,
  1. Increase
  2. Decrease
  3. Remain same
  4. None

Answer: 1

10. The nature of line constants in the rigorous solution of transmission line is
  1. Distributed parameter
  2. Lumped parameter
  3. Both
  4. None

Answer: 1

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