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.Management Sciences
Category: Electromagnetic Induction
For electroplating we use_________________?
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A. A D.C source
B. an A.C source
C. any source
D. all of the above
emf induced in a circuit according to Faradays law depends on the_____________?
A. maximum magnetic flux
B. rate of change of magnetic flux
C. change in magnetic flux
D. initial magnetic flux
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will_____________?
A. increase
B. decrease
C. remain the same
D. initially increase and then decrease
For long distance transmission the transformer used is_____________?
A. Step down
B. Input voltage and output voltage remain same
C. Step up
D. Amplifier is used
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
A. unaffected
B. doubled
C. halved
D. quadrupled
If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
A. Vs/Vp = Np/Ns
B. Vs/Vp = Ns/Np
C. Vp/Vs = Ns/Np
D. Vp/Vs = Np/Ns
Weber is the unit of_____________?
A. Magnetic field intensity
B. magnetic induction
C. magnetic flux
D. self-inductance
Power loss in actual transformer is due to_________________?
A. Small output
B. Eddy currents and magnetic hysterias
C. Soft iron core
D. Back emf
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