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A Transformer Transforms MCQ. We covered all the A Transformer Transforms MCQ in this post for free so that you can practice well for the exam.
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Mock Test on A Transformer Transforms for Students
In a transformer, the coefficient of mutual inductance is 4H. If a current of 5A in the primary coil is cut off in 1/1500 second, the e.m.f. at the terminal of the secondary coil will be :
(A) 10 KV
(B) 30 KV
(C) 15 KV
(D) 60 KV
Option b – 30 KV
In a step-up transformer, the output voltage is 2400 V for 120 V input. The number of turns of the primary is 75, and the number of turns of the secondary coil is:
(A) 150
(B) 1500
(C) 1200
(D) 1575
Option b – 1500
The quantity that remains unchanged in a transformer is :
(A) Voltage
(B) Current
(C) Frequency
(D) Impedance
Option c – Frequency
Which quantity remains constant in an ideal step-down transformer? :
(A) Current
(B) Voltage
(C) Power
(D) Reactance
Option c – Power
A transformer is used to reduce the main supply of 220 V to 11 V. If the current in the primary and secondary coils are 5 A and 90 A respectively, the efficiency of a transformer is :
(A) 90 %
(B) 75 %
(C) 40 %
(D) 60 %
Option a – 90 %
Transformers are used in
(A) D.C. circuits only
(B) A.C. circuits only
(C) Integrated circuits
(D) In AC and DC both circuits
Option b – A.C. circuits only
The core used in a transformer is laminated, in order to :
(A) Increase the magnetic field
(B) Increase the magnetic saturation level of the core
(C) Increase the residual magnetism of the core
(D) Decrease eddy current loss
Option d – Decrease eddy current loss
The power loss in a transformer working on 220 V a.c. supply is 30 %. The ratio of primary to secondary current when the output voltage is 110 V is :
(A) 1 : 2
(B) 2 : 1
(C) 1 : 1
(D) 5 : 7
Option d – 5 : 7
A transformer that has an efficiency of 90% is working on 200 V and 3kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are :
(A) 300 V, 15 A
(B) 450 V, 13. 5 A
(C) 450 V, 15 A
(D) 600 V, 15 A
Option c – 450 V, 15 A
The primary winding of the transformer has 200 turns and its secondary winding has 50 turns. If the current in the secondary winding is 40 A, the current in the primary is?
(A) 10 A
(B) 80 A
(C) 160 A
(D) 8000 A
Option a – 10 A
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