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Transformers
Transformers Basic
Quiz 1
Solution
Q.1.
Categories for a transformer earthing of a system neutral are ___
a) 2
b) 3
c) 4
d) Many
Q.2.
Which of the following neutral earthing method is disadvantageous?
a) Neutral solidly earthed
b) Neutral earthed via an impedance
c) Neutral isolated
d) Neutrally
Q.3.
Minimum voltage above which electrical system needs to be earthed is _____
c) 10 V
d) 20 V
a) 50 V
b) 5 V
Q.4.
What is the low voltage range according to the earthing procedures?
a) 5 V – 100 V
b) 0 V – 100 V
c) 50 V – 1000 V
d) 0 V – 1000 V
Q.5.
Low voltage systems should be solidly earthed.
a) True
b) False
Q.6.
Earthed neutral allows rapid operation of protection to ___________
a) Line to line faults
b) Earthed faults
c) Other faults
d) For all faults
Q.7.
Which method will reduce the cost of insulation between earth and cables?
a) Neutral solidly earthed
b) Neutral earthed via an impedance
c) Neutral isolated
d) Neutrally
Q.8.
For an un-earthed line voltage of line to earth can be ______________
a) More than line to neutral of earthed system
b) Less than line to neutral of earthed system
c) Equal to line to neutral of earthed system
d) Can’t specify
Q.9.
High voltage line is only disadvantageous in ______________
a) Small overhead lines
b) Small underground lines
c) Long overhead lines
d) Long underground lines
Q.10.
Earth contact material resistance should be ____________
a) Less than 2 ohms
b) More than 2 ohms
c) Depends on the circuit or system
d) Very high
Q.11.
If parallel arrangement is done the minimum distance between two earthing conductors should be _______
a) 10 meters
b) 5 meters
c) More than or equal to 10 meters
d) 2 meters
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