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Transformer MCQ Online Mock Test 3
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Q-: 1) A transformer is working at its full load and its
efficiency is also maximum at which iron loss is 1000 Watts. Then its copper
loss at half of full load will be:
A) 250 Watts
B) 300 Watts
C) 400 Watts
D) 500 Watts
Q-: 2) Distribution transformers are designed to have
maximum efficiency nearly at:
A) 100 % of full load
B) 50 % of full load
c) 25 % of full load
D) 10 % of full load
Q-: 3) A 2 KVA transformer has iron loss of 150 W and full
load copper loss of 250 W. The maximum efficiency of the transformer will occur
when the total loss is:
A) 500 W
B) 400 W
C) 300 W
D) 275 W
Q-: 4) A 20 KVA, 2000/200, 2-winding transformer, when used as
an autotransformer, with constant voltage source of 2000 V, is capable of
handling
A) 20 KVA
B) 220 KVA
c) 320 KVA
D) None of these
Q-: 5) Power transformer are designed such that maximum
efficiency occur at
A) Half of the full load
B) Near full load
c) ¼ of full load
D) ¾ of full load
Q-: 6) In a 1-phase transformer, the copper loss at full
load is 600 Watts. At half of the full load the copper loss will be
A) 150 Watts
B) 75 Watts
C) 600 Watts
D) 300 Watts
Q-: 7) In autotransformer, the number of turns in primary
winding is 210 and in secondary winding is 140. If the input currents is 60 A,
the currennts in output and in common winding are respectively
A) 40 A, 20 A
B) 40 A, 100 A
c) 90 A, 30 A
D) 90 A, 150 A
Q-: 8) A 3-phase transformer has its primary connected in
delta and secondary in star. Secondary to primary turns ratio per phase is 6.
For a primary voltage of 200, the secondary voltage would be
A) 2078 V
B) 693 V
c) 1200 V
D) 58 V
Q-: 9) The iron loss in a 100 KVA transformer is 1 KW and
full load copper losses are 2 KW. The maximum efficiency occurs at a load of
A) 100 KVA
B) 70.7 KVA
c) 141.4 KVA
D) 50 KVA
Q-: 10) The iron loss per unit frequency in a ferromagnetic
core. When plotted against frequency, is a
A) Straight line with positive slope
B) Straight line with negative slope
C) Parabola
D) Constant
Q-: 1) A transformer is working at its full load and its efficiency is also maximum at which iron loss is 1000 Watts. Then its copper loss at half of full load will be:
A) 250 Watts
B) 300 Watts
C) 400 Watts
D) 500 Watts
Q-: 2) Distribution transformers are designed to have maximum efficiency nearly at:
A) 100 % of full load
B) 50 % of full load
c) 25 % of full load
D) 10 % of full load
Q-: 3) A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer will occur when the total loss is:
A) 500 W
B) 400 W
C) 300 W
D) 275 W
Q-: 4) A 20 KVA, 2000/200, 2-winding transformer, when used as an autotransformer, with constant voltage source of 2000 V, is capable of handling
A) 20 KVA
B) 220 KVA
c) 320 KVA
D) None of these
Q-: 5) Power transformer are designed such that maximum efficiency occur at
A) Half of the full load
B) Near full load
c) ¼ of full load
D) ¾ of full load
Q-: 6) In a 1-phase transformer, the copper loss at full load is 600 Watts. At half of the full load the copper loss will be
A) 150 Watts
B) 75 Watts
C) 600 Watts
D) 300 Watts
Q-: 7) In autotransformer, the number of turns in primary winding is 210 and in secondary winding is 140. If the input currents is 60 A, the currennts in output and in common winding are respectively
A) 40 A, 20 A
B) 40 A, 100 A
c) 90 A, 30 A
D) 90 A, 150 A
Q-: 8) A 3-phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 6. For a primary voltage of 200, the secondary voltage would be
A) 2078 V
B) 693 V
c) 1200 V
D) 58 V
Q-: 9) The iron loss in a 100 KVA transformer is 1 KW and full load copper losses are 2 KW. The maximum efficiency occurs at a load of
A) 100 KVA
B) 70.7 KVA
c) 141.4 KVA
D) 50 KVA
Q-: 10) The iron loss per unit frequency in a ferromagnetic core. When plotted against frequency, is a
A) Straight line with positive slope
B) Straight line with negative slope
C) Parabola
D) Constant
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