Power System

power system mcq

Power System MCQ

Power System / By
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

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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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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power system mcq

Power System MCQ

Power System / By
Previous
1. ACSR conductor have
  1. all conductors made of aluminium
  2. outer conductors made of aluminium
  3. inner conductor made of aluminium
  4. core made of aluminium

Answer: 2

2. If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency, will
  1. increase
  2. decrease
  3. remain unchanged
  4. may increase or decrease

Answer: 3

3. If the length of a transmission line is increased its capacitance will
  1. increase
  2. decrease
  3. remain same
  4. increase or decrease

Answer: 1

4. The line parameters are (a) Shunt reactance (b) Series reactance (c) Conductance (d) Resistance
  1. a and b
  2. a and c
  3. b,c and d
  4. a,b,c and d

Answer: 4

5. The skin effect does not depends on,
  1. nature of material
  2. size of wire
  3. supply frequency
  4. temperature

Answer: 4

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6. For OH transmission line, the self GMD method is used to find
  1. Capacitance
  2. Inductance
  3. Both
  4. None

Answer: 4

7. ACSR conductor have the central core made of
  1. Copper
  2. Steel
  3. Aluminium
  4. Cadmium

Answer: 2

8. Which of the following conductor spirality effect is ignored
  1. Magnetic
  2. Non-magnetic
  3. Both
  4. None

Answer: 2

9. Highest transmission voltage in India
  1. 400 KV
  2. 450 KV
  3. 500 KV
  4. 750 KV

Answer: 4

10. If the height of transmission tower is increased,
  1. line capacitance increases and line inductance decreases
  2. line capacitance decreases and line inductance increases
  3. line capacitance remain same and line inductance decreases
  4. line capacitance decreases and line inductance remain same

Answer: 4

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power system mcq

Power System MCQ

Power System / By
Next
1. If the conductor diameter decreases, inductance of the line,
  1. increases
  2. decreases
  3. remaining same
  4. cannot be determined

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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