power system mcq

Power System MCQ

1. If the conductor diameter decreases, inductance of the line,
  1. increases
  2. decreases
  3. remaining same
  4. cannot be determined
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Answer: 1

2. A conductor carries more current on the surface as compared to core. This is called as
  1. Permeability
  2. Corona effect
  3. Skin effect
  4. Unsymmetrical fault

Answer: 3

3. The inductance of a line is minimum when,
  1. GMD is high
  2. GMR is high
  3. GMD and GMR are high
  4. GMD is low and GMR is high

Answer: 4

4. The economic size of a conductor is determined by,
  1. Kelvin’s law
  2. Kirchoff’s law
  3. Faraday’s law
  4. All of the above

Answer: 1

5. Skin effect depends upon,
  1. Supply frequency
  2. Size of conductor
  3. Nature of material
  4. All of the above

Answer: 4

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6. The DC resistance of conductor is less than AC resistance due to,
  1. Skin effect
  2. Proximity effect
  3. Both
  4. None

Answer: 3

7. For increasing the capacity of a transmission line, to transmit power,which of the following must be decreased.
  1. Voltage
  2. Line inductance
  3. Capacitance
  4. All

Answer: 2

8. Use of bundled conductor increases,
  1. GMR
  2. GMD
  3. Potential gradient
  4. Radius of conductor

Answer: 1

9. Which of the following is not a standard transmission voltage.
  1. 400 KV
  2. 11 KV
  3. 190 KV
  4. 750 KV

Answer: 3

10. The overall diameter ‘D’of a standard conductor is given in terms of diameter of each strand ‘d’ and no. of layers ‘n’ as,
  1. D = 2(n-1)d
  2. D = 2n-1/d
  3. D = 2(2n-1)d
  4. D = 2(n-D)d

Answer: 3

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