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.Management Sciences
Category: Electromagnetic Induction
For long distance transmission the transformer used is_____________?
0
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
Lenz’s law is a consequence of the law of conservation of__________?
A. induced current
B. charge
C. energy
D. induced e.m.f.
If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?
A. aid the increasing current
B. tend to decrease the amount of cur-rent
C. produce current opposite to the in-creasing current
D. aid the applied voltage
Which circuit element(s) will oppose the change in circuit current ?
A. Resistance only
B. Inductance only
C. Capacitance only
D. Inductance and capacitance
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