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Transformer MCQ Online Mock Test 4
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Q-: 1) Eddy current loss in ferromagnetic core is
proportional to
A) Square of frequency
B) Square root of frequency
C) Frequency
D) Reciprocal of frequency
Q-: 2 ) If the frequency of input voltage of a transformer
is increased keeping the magnitude of the voltage unchanged
A) both hysteresis loss and eddy current loss in the core
will increase.
B) Hysteresis loss will increase but eddy current loss will
decrease.
C) Hysteresis loss will decrease but eddy current loss will remain unchanged.
D) Hysteresis loss will decrease but eddy current loss will increase.
Q-: 3) Stepped core is used in transformer in order to
reduce
A) Volume of iron
B) Volume of copper
C) Iron loss
D) Reluctance of core
Q-: 4) The primary and secondary windings of a transformer
are wound on the top of each other in order to reduce_____
A) Iron loss
B) Winding resistance
C) Copper losses
D) Leakage reactance
Q-: 5) The no load Input power to a transformer is
practically equal to ___ loss in the transformer.
A) Copper
B) Eddy current
C) Iron
D) Windage
Q-: 6) The no load primary current I0 is about ____of full load primary
current of a transformer.
A) Above 40%
B) 30-40%
C) 15-30%
D) 3-5%
Q-: 7) Leakage flux in a transformer occurs because,
A) Transformer is not an efficient device.
B) Applied voltage is sinusoidal.
C) Air is not a good magnetic insulator
D) Iron core has high permeability
Q-: 8) The load carried by V-V connection is ____
A) 47.7% of the original load
B) 57.7% of the original load
C) 67.7 of the original load
D) 87.7 of the
original load
Q-:9) If the AC supply to transformer is replaced by DC_____
A) The primary winding will burn
B) The secondary winding will burn
C) The transformer has no effect
D) All option are correct
Q-: 10) For a 100% efficient transformer, the primary
winding has 1000 turns and the secondary 100 turns. IF the power input to the
above transformer is 1000 Watts, the power output is_____
A) 1000 Watts
B) 100 Watts
C) 10 Watts
D) 10 KW
Q-: 1) Eddy current loss in ferromagnetic core is proportional to
A) Square of frequency
B) Square root of frequency
C) Frequency
D) Reciprocal of frequency
Q-: 2 ) If the frequency of input voltage of a transformer is increased keeping the magnitude of the voltage unchanged
A) both hysteresis loss and eddy current loss in the core will increase.
B) Hysteresis loss will increase but eddy current loss will decrease.
C) Hysteresis loss will decrease but eddy current loss will remain unchanged.
D) Hysteresis loss will decrease but eddy current loss will increase.
Q-: 3) Stepped core is used in transformer in order to reduce
A) Volume of iron
B) Volume of copper
C) Iron loss
D) Reluctance of core
Q-: 4) The primary and secondary windings of a transformer are wound on the top of each other in order to reduce_____
A) Iron loss
B) Winding resistance
C) Copper losses
D) Leakage reactance
Q-: 5) The no load Input power to a transformer is practically equal to ___ loss in the transformer.
A) Copper
B) Eddy current
C) Iron
D) Windage
Q-: 6) The no load primary current I0 is about ____of full load primary current of a transformer.
A) Above 40%
B) 30-40%
C) 15-30%
D) 3-5%
Q-: 7) Leakage flux in a transformer occurs because,
A) Transformer is not an efficient device.
B) Applied voltage is sinusoidal.
C) Air is not a good magnetic insulator
D) Iron core has high permeability
Q-: 8) The load carried by V-V connection is ____
A) 47.7% of the original load
B) 57.7% of the original load
C) 67.7 of the original load
D) 87.7 of the original load
Q-:9) If the AC supply to transformer is replaced by DC_____
A) The primary winding will burn
B) The secondary winding will burn
C) The transformer has no effect
D) All option are correct
Q-: 10) For a 100% efficient transformer, the primary winding has 1000 turns and the secondary 100 turns. IF the power input to the above transformer is 1000 Watts, the power output is_____
A) 1000 Watts
B) 100 Watts
C) 10 Watts
D) 10 KW
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