300+ TOP MCQs on Electromotive Force and Answers

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MCQs on Electromotive Force :

<1. The flux used in the equation for the calculation of induced emf in a transformer is in its
(A) RMS value
(B) Average value
(C) Maximum value
(D) Twice that of the maximum value

Answer

Answer: (C) Maximum value

2. What should be the value of primary to the secondary ratio for  a transformer to be an isolation transformer?
(A) Equal to one
(B) Less than one
(C) More than one
(D) Equal to 0.5

Answer

Answer: (A) Equal to one

3. The average emf induced per turn in a transformer is given by
(A) 1.11f Φ_m
(B) 0.5f Φ_m
(C) 4f Φ_m
(D) 8f Φ_m

Answer

Answer: (C) 4f Φ_m

4. Who introduced the right-hand rule for determining the direction of the induced EMF?
(A) Fleming
(B) Lenz
(C) Maxwell
(D) Faraday

Answer

Answer: (A) Fleming

5. Whenever there is a change in magnetic flux with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s
(A) first law
(B) third law
(C) second law
(D) fourth law

Answer

Answer: (A) first law

6. Power of battery having emf E₁=20V is
(A) 44.2 Watt
(B) 30.8 Watt
(C) 13.4 Watt
(D) 20 Watt

Answer

Answer: (A) 44.2 Watt

7. In which device is the principle of statically induced emf used?
(A) Transformer
(B) Motor
(C) Generator
(D) Battery

Answer

Answer: (A) Transformer

8. Statically induced emf’s magnitude depends on the
(A) Rate of change of flux
(B) Coil resistance
(C) Flux magnitude
(D) None of these

Answer

Answer: (A) Rate of change of flux

9. Which is the property of a coil by which a counter emf is induced when the current through the coil changes?
(A) Self-inductance
(B) Mutual inductance
(C) Capacitance
(D) None of these

Answer

Answer: (A) Self-inductance

10. Principle of dynamically induced emf is used in a
(A) Choke
(B) Transformer
(C) Generator
(D) Thermo-couple

Answer

Answer: (C) Generator