Electrical Pole (Pict -2), #picture_of_the_day_PSEnggRW
Cables fault locator (Pict -3), #picture_of_the_day_PSEnggRW
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Motor Rewinding (Pict -4), #picture_of_the_day_PSEnggRW
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Wiring of the Distribution Board with RCD (Pict -4), #picture_of_the_day_PSEnggRW
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Types of Transmission line tower with voltage levels (Pict -5), #picture_of_the_day_PSEnggRW
3ϕ Induction motor star delta connection (Pict -6), #picture_of_the_day_PSEnggRW
#mcqs_earthing_or_grounding (Page -1),
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For an EHV equipment for maintenance first it should be isolated and connected to ground because
Anonymous Quiz
20%
A. to provide low impedance
20%
B. to discharge the charging capacitance to ground
0%
C. protection for operating personnel
60%
D. both (B) and (C)
When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will
A. Increases
B. Decreases
C. Remains unaffected
D. none of the above
Answer: Option A
If The line to ground voltage is V then line to line voltage will be √ 3 times V. Now if one line is grounded due to ground fault. Then voltage between this line and faulted line becomes double the voltage between line to ground. I. E from line to ground and from ground to faulted phase voltage will be added
A. Increases
B. Decreases
C. Remains unaffected
D. none of the above
Answer: Option A
If The line to ground voltage is V then line to line voltage will be √ 3 times V. Now if one line is grounded due to ground fault. Then voltage between this line and faulted line becomes double the voltage between line to ground. I. E from line to ground and from ground to faulted phase voltage will be added
Moisture content in the soil _______ the earth soil resistance
Anonymous Quiz
33%
A. increase
67%
B. decrease
0%
C. does not affect
0%
D. none of the above
Generally grounding is provided for
A. only for the safety of the equipment
B. only for the safety of the operating personnel
C. both (A) and (B)
D. none of the above
Answer: Option C
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Ground resistance should be designed such that
A. grounding resistance should be as low as possible
B. grounding resistance should be as high as possible
C. grounding resistance should be always zero
D. none of the above
Answer: Option A
@power_system_engineering
A. only for the safety of the equipment
B. only for the safety of the operating personnel
C. both (A) and (B)
D. none of the above
Answer: Option C
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Ground resistance should be designed such that
A. grounding resistance should be as low as possible
B. grounding resistance should be as high as possible
C. grounding resistance should be always zero
D. none of the above
Answer: Option A
@power_system_engineering
Earth wire or ground wire is made of
Anonymous Quiz
58%
A. copper
0%
B. aluminium
8%
C. iron
33%
D. galvanized steel
The objective of earthing or grounding is
A. to provide as low resistance possible to the ground
B. to provide as high resistance possible to the ground
C. to provide flow of positive, negative and zero sequence currents
D. none of the above
Answer: Option A
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Factors on which soil resistance depends
A. depth of the electrode
B. moisture
C. Nacl
D. all the above
Answer: Option D
@power_system_engineering
A. to provide as low resistance possible to the ground
B. to provide as high resistance possible to the ground
C. to provide flow of positive, negative and zero sequence currents
D. none of the above
Answer: Option A
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Factors on which soil resistance depends
A. depth of the electrode
B. moisture
C. Nacl
D. all the above
Answer: Option D
@power_system_engineering
Average resistance of human body is
A. 500 ohms
B. 1000 ohms
C. 1500 ohms
D. 2000 ohms
Answer: Option B
about 10,000 ohms
Human resistance is about 10,000 ohms on the high side and as little as 1,000 ohms if the person is wet. Remember, ohms is the unit of measure of a material's resistance or impedance to current flow.
A. 500 ohms
B. 1000 ohms
C. 1500 ohms
D. 2000 ohms
Answer: Option B
about 10,000 ohms
Human resistance is about 10,000 ohms on the high side and as little as 1,000 ohms if the person is wet. Remember, ohms is the unit of measure of a material's resistance or impedance to current flow.
====End of mcqs_earthing_or_grounding (Page -1)====
Farady prefabricated compact transformers (Pict -7),
#picture_of_the_day_PSEnggRW
#picture_of_the_day_PSEnggRW
Components of an electrical substation site (Pict -8),
#picture_of_the_day_PSEnggRW
#picture_of_the_day_PSEnggRW