Power System Planning and Design (2180903) MCQs

MCQs of Power system earthing

Showing 1 to 10 out of 30 Questions
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1.
Earthing is necessary to give protection against
(a) Electric shock
(b) Voltage fluctuation
(c) Overloading
(d) Temperature rise
Answer:

Option (a)

2.
Solid grounding is adopted for voltages below
(a) 100 V
(b) 230 V
(c) 400 V
(d) 600 V
Answer:

Option (d)

3.
The advantage of neutral earthing is
(a) Freedom from persistent arcing grounds
(b) Over voltages due to lightning can be discharged to earth
(c) Simplified design earth fault protection
(d) All of above
Answer:

Option (d)

4.
In a star connected system without neutral grounding, zero sequence currents are
(a) Zero
(b) Phaser sum of phase currents
(c) Same as RMS value of phase currents
(d) Same as peak value of phase currents
Answer:

Option (a)

5.
The advantage of neutral earthing is
(a) Safety of personnel
(b) Reduction of earth fault current
(c) Elimination of arcing ground
(d) None of above
Answer:

Option (c)

6.
In case of earth fault, the underground neutral system____________________lead to arcing ground
(a) Does
(b) Does not
(c) Any of above
(d) None of above
Answer:

Option (a)

7.
Grounding transformer is used where neutral___________________available
(a) Is
(b) Is not
(c) Any of above
(d) None of above
Answer:

Option (b)

8.
Ground wire is colored
(a) Green
(b) Black
(c) Yellow
(d) Red
Answer:

Option (a)

9.
In equipment grounding, the enclosure is connected to______________________wire
(a) Ground
(b) Neutral
(c) Phase
(d) Any of above
Answer:

Option (a)

10.
The earthing rod orientation in the pit is
(a) Horizontal
(b) Vertical
(c) 45°
(d) 120°
Answer:

Option (a)

Showing 1 to 10 out of 30 Questions
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