(A) Step-down transformer
(B) Step-up transformer
(C) Transformer with several secondaries
(D) All of these
Author:
When the plane of the coil of and A.C. generator is perpendicular to the magnetic field, the emf produced will be:
(A) Maximum
(B) Minimum
(C) Zero
(D) None of these
One henry is equal to:
(A) 1 ohm x 1 sec
(B) 1 ohm x 1 meter
(C) 1 ohm / 1 coulomb
(D) 1 ohm / 1 meter
The direction of induced current is determined by:
(A) Faraday’s law
(B) Ohm’s law
(C) Ampere’s law
(D) Lenz’s law
The SI unit of self-induction is the same as that of:
(A) Capacitance
(B) Mutual inductance
(C) e.m.f
(D) Reactance
According to Faraday’s law, the emf induced in a coil depends on the:
(A) Maximum magnetic flux
(B) Rate of change of magnetic flux
(C) Change in magnetic flux
(D) Internal magnetic flux
If the motor is overloaded , then the magnitude of “Back emf”:
(A) Increases
(B) Decreases
(C) Remains constant
(D) Becomes zero
The induced emf in a motor which opposes the external emf running the motor is called:
(A) Induced emf of a motor
(B) Back emf of a motor
(C) emf
(D) Forward emf of battery