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Mock test on A Transformer Transforms for Students
In a transformer, the mutual inductance between the coils is 4 H. If the current in the primary coil decreases from 5 A to zero in 15001 second, the induced e.m.f. across the secondary terminals will be:
a) 10 kV
b) 30 kV
c) 15 kV
d) 60 kV
Option b – 30 kV
A step-up transformer raises the voltage from 120 V to 2400 V. If the primary coil has 75 turns, the number of turns in the secondary coil is:
a) 150
b) 1500
c) 1200
d) 1575
Option b – 1500
Which of the following quantities remains the same in a transformer?
a) Voltage
b) Current
c) Frequency
d) Impedance
Option c – Frequency
In an ideal step-down transformer, which quantity remains constant?
a) Current
b) Voltage
c) power
d) Reactance
Option c – power
A transformer reduces the mains voltage from 220 V to 11 V. If the current in the primary and secondary coils are 5 A and 90 A respectively, the efficiency of the transformer is:
a) 90%
b) 75%
c) 40%
d) 60%
Option a – 90%
Transformers are mainly used in:
a) Only DC circuits
b) Only AC circuits
c) Integrated circuits
d) Both AC and DC circuits
Option b – Only AC circuits
The core of a transformer is laminated mainly to:
a) Increase the magnetic field strength
b) Increase magnetic saturation
c) Increase residual Magnetism
d) Reduce eddy current losses
Option d – Reduce eddy current losses
A transformer operating on a 220 V AC supply has a power loss of 30%. If the secondary voltage is 110 V, the ratio of primary current to secondary current is:
a) 1 : 2
b) 2 : 1
c) 1 : 1
d) 5 : 7
Option d – 5 : 7
A transformer with 90% efficiency operates on a 200 V, 3 kW power supply. If the secondary current is 6 A, the secondary voltage and primary current 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 a transformer has 200 turns and the secondary winding has 50 turns. If the current in the secondary winding is 40 A, the current in the primary winding is:
a) 10 A
b) 80 A
c) 160 A
d) 8000 A
Option a – 10 A
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