This document contains a practice question set from Test Shopping, an innovative e-learning organization, for the TNEB/TANGEDCO AE Electrical Engineering Power System exam. It includes 10 multiple choice questions related to topics like circuit breakers, transmission lines, transformers, and power stations. The questions assess understanding of concepts like fault current behavior, factors that influence arc current, gas used in air blast circuit breakers, transformer protection relays, and how installed power station capacity is calculated.

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TNEB / TANGEDCO AE
ELECTRICAL ENGINEERING
POWER SYSTEM
Practice Question Set

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In circuit breaker operating condition, at the instant of
current zero point, the fault current is.
1. Leads the arc voltage by 𝟗𝟎𝟎
2. Lags the arc voltage by 𝟑𝟎𝟎
3. Leads the arc voltage by 𝟑𝟎𝟎
4. Lags the arc voltage by 𝟗𝟎𝟎

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In circuit breaker operating condition, at the instant of
current zero point, the fault current is.
1. Leads the arc voltage by 𝟗𝟎𝟎
2. Lags the arc voltage by 𝟑𝟎𝟎
3. Leads the arc voltage by 𝟑𝟎𝟎
4. Lags the arc voltage by 𝟗𝟎𝟎

4. TNEB / TANGEDCO AE – POWER
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During arcing period of circuit breaker, the current flowing
through the electrodes is depends on.
1. Degree of ionization
2. Length of arc
3. Arc resistance
4. All of the above

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During arcing period of circuit breaker, the current flowing
through the electrodes is depends on.
1. Degree of ionization
2. Length of arc
3. Arc resistance
4. All of the above

6. TNEB / TANGEDCO AE – POWER
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Which of the following gases used as arc quenching medium
in Air blast circuit breaker?
1. Nitrogen
2. Carbon dioxide
3. Hydrogen
4. All of the above

7. TNEB / TANGEDCO AE – POWER
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Which of the following gases used as arc quenching medium
in Air blast circuit breaker?
1. Nitrogen
2. Carbon dioxide
3. Hydrogen
4. All of the above

8. TNEB / TANGEDCO AE – POWER
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The operating time for circuit breaker is about.
1. 0.002 sec
2. 0.5 sec
3. 0.18 sec
4. 0.05 sec

9. TNEB / TANGEDCO AE – POWER
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The operating time for circuit breaker is about.
1. 0.002 sec
2. 0.5 sec
3. 0.18 sec
4. 0.05 sec

10. TNEB / TANGEDCO AE – POWER
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The operating time of distance relay is depends on.
1. Voltage
2. Current
3. Distance
4. All of the above

11. TNEB / TANGEDCO AE – POWER
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The operating time of distance relay is depends on.
1. Voltage
2. Current
3. Distance
4. All of the above

12. TNEB / TANGEDCO AE – POWER
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Which of the following relay used to protect the system of
transformer?
1. Earth fault relay
2. Over current relay
3. Merz-Price relay
4. All of the above

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Which of the following relay used to protect the system of
transformer?
1. Earth fault relay
2. Over current relay
3. Merz-Price relay
4. All of the above

14. TNEB / TANGEDCO AE – POWER
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Which of the following expression denotes the volume of
conductor material affected by power factor in transmission
line?
1. 𝑪𝒐𝒔𝟐𝝋
2. 𝟏
𝑪𝒐𝒔𝟐𝝋
3. 𝑪𝒐𝒔𝝋
4. 𝟏
𝑺𝒊𝒏𝟐𝝋

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Which of the following expression denotes the volume of
conductor material affected by power factor in transmission
line?
1. 𝑪𝒐𝒔𝟐𝝋
2. 𝟏
𝑪𝒐𝒔𝟐𝝋
3. 𝑪𝒐𝒔𝝋
4. 𝟏
𝑺𝒊𝒏𝟐𝝋

16. TNEB / TANGEDCO AE – POWER
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In the power transformer is connected with Delta-Star, then
the current transformer should be in.
1. Delta – Star
2. Star – Delta
3. Star – Star
4. Delta – Delta

17. TNEB / TANGEDCO AE – POWER
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In the power transformer is connected with Delta-Star, then
the current transformer should be in.
1. Delta – Star
2. Star – Delta
3. Star – Star
4. Delta – Delta

18. TNEB / TANGEDCO AE – POWER
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The maloperation of differential protection of transformer due to
magnetizing inrush current is prevented by filtering.
1. 2nd harmonic content with rate of change of core flux and supply
voltage is 𝟗𝟎𝟎 out of phase.
2. 2nd harmonic content with rate of change of core flux and supply
voltage is 𝟏𝟖𝟎𝟎 in-phase.
3. 5th harmonic content with rate of change of core flux and supply
voltage is 𝟗𝟎𝟎
out of phase.
4. 5th harmonic content with rate of change of core flux and supply
voltage is 𝟏𝟖𝟎𝟎 in-phase.

19. TNEB / TANGEDCO AE – POWER
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The maloperation of differential protection of transformer due to
magnetizing inrush current is prevented by filtering.
1. 2nd harmonic content with rate of change of core flux and supply
voltage is 𝟗𝟎𝟎 out of phase.
2. 2nd harmonic content with rate of change of core flux and supply
voltage is 𝟏𝟖𝟎𝟎 in-phase.
3. 5th harmonic content with rate of change of core flux and supply
voltage is 𝟗𝟎𝟎
out of phase.
4. 5th harmonic content with rate of change of core flux and supply
voltage is 𝟏𝟖𝟎𝟎 in-phase.

20. TNEB / TANGEDCO AE – POWER
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The annual load duration curve of a certain power station can be
considered as a straight line from 20 MW to 4 MW. To meet this
load, three turbine-generator units, two rated at 10 MW each and
one rated at 5 MW are installed. The installed capacity is.
1. 10 MW
2. 20 MW
3. 25 MW
4. 4 MW

21. TNEB / TANGEDCO AE – POWER
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The annual load duration curve of a certain power station can be
considered as a straight line from 20 MW to 4 MW. To meet this
load, three turbine-generator units, two rated at 10 MW each and
one rated at 5 MW are installed. The installed capacity is.
1. 10 MW
2. 20 MW
3. 25 MW
4. 4 MW
Installed Capacity = 10 +10 +5
= 25 MW

22. TNEB / TANGEDCO AE – POWER
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The annual load duration curve of a certain power station can be
considered as a straight line from 20 MW to 4 MW. To meet this
load, three turbine-generator units, two rated at 10 MW each and
one rated at 5 MW are installed. The installed capacity is.
1. 10 MW
2. 20 MW
3. 25 MW
4. 4 MW
Installed Capacity = 10 +10 +5
= 25 MW

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