WorksheetsEARTHING MCQ
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
The secondary winding of which of the following transformers is always kept closed?
a)
Current transformer
b)
Voltage transformer
c)
Power transformer
d)
Step down transformer
2.
If the supply frequency of a transformer increases, the secondary output voltage of the transformer
a)
Increase
b)
Increase
c)
Remain the same
d)
Any of the above
3.
The open-circuit test in a transformer is used to measure
a)
Copper loss
b)
Winding loss
c)
Total loss
d)
core loss
4.
Lamination of the transformer core is made of
a)
Cast Iron
b)
Silicon Steel
c)
Aluminum
d)
Cast Steel
5.
Silicon steels are used for electrical transformer cores and cores of other electrical devices for the following reasons:-
a)
Low hysteresis loss.
b)
High permeability.
c)
Virtually eliminated aging.
d)
High resistance.
6.
Breather is provided in a transformer to
a)
Absorb moisture of air during breathing
b)
provide cold air in the transformer
c)
The filter of transformer oil
d)
None of above
7.
Which of the following losses varies with the load in the transformer?
a)
Core loss
b)
copper loss
c)
Both core & copper loss
d)
None of above
8.
A transformer transform
a)
Current
b)
Voltage & current
c)
frequency
d)
voltage
9.
Transformer core are laminated in order to
a)
reduce hysteresis loss
b)
reduce hysteresis & eddy current loss
c)
minimize eddy current loss
d)
Copper loss
10.
The type of transformer oil used
a)
cookiing oil
b)
systenthic oil
c)
mineral oil
d)
Any of the above
100 %
