Electromagnetism
When a coil rotates in a magnetic field, the induced current in it continuously changes from
minimum to maximum value
maximum to minimum value
zero to maximum value
maximum to zero
maximum to minimum value
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It is made of many loops mounted on a shaft or axleA. fuse
B. transformer
C. armature
D. circuit
A transformer is designed to convert the voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. If it is 100% efficient, and the current in the secondary coil was 0.4 A then the current in the primary coil should be
A. 0.08 A
B. 0.05 A
C. 0.02 A
D. 0.01 A
The number of coils in a transformer is
A. 2
B. 3
C. 4
D. 5
In the transformer, if the secondary voltage is more than the primary voltage then it is called
A. step up transformer
B. step down transformer
C. inductor
D. resistor
An ideal transformer dissipates by itself
A. low power
B. high power
C. no power
D. none of above
A transformer is needed to convert 200 V into a 10 V supply. If there are 1000 turns on the primary coil, then the number of turns on the secondary coil is
A. 100
B. 2000
C. 75
D. 500
The information of users which are read by the ATM machines are stored on
A. magnetic box on card
B. magnetic strip on card
C. inside ATM machine
D. none of above
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