Q.1 The direction of induced emf produced sue to the process of electromagnetic induction is always such that it will set up a current to oppose the basic cause responsible for inducing the emf. This statement is give by___.
A. Michael Faraday’s
B. Fleming’s
C. Heinrich Lenz
D. none of the above
Ans.: C
Q. 2 The induced voltage is given by__.
A. e = – N dф/dt
B. e = N dф/dt
C. e = dф/dt
D. All of the above
Ans.: A
Q. 3 The nature of induced emf is/are
A. dynamically induced emf
B. Statically induced emf
C. Both A and B
D. none of the above
Ans.: C
Q. 4 An emf is induced due to a physical movement of either conductor or flux is known as___.
A. dynamically induced emf
B. statically induced emf
C. mutually induced emf
D. any of the above
Ans.: A
Q. 5 The induce emf is zero when the plane of conductor is__.
A. Perpendicular to the plane of magnetic flux
B. Parallel to the plane of magnetic flux
C. either perpendicular or parallel
D. neither perpendicular nor parallel
Ans.: B
Q.6 The induce emf is maximum when the plane of conductor is__.
A. Parallel to the plane of magnetic flux
B. either perpendicular or parallel
C. Perpendicular to the plane of magnetic flux
D. in all the above cases
Ans.: C
Q. 6 A coil of 200 turns is linked by a flux of 20 mWb. If this reversed in a time of 2 m sec., calculate the average emf induced in the coil.
A. 2000 volts
B. 4000 volts
C. 8000 volts
D. 1000 volts
Ans.: B
Q. 7 Correct equation of the induced emf when motion of conductor is not perpendicular to the plane of magnetic flux.
A. e = Blv sinѲ volts
B. e = Bv sinѲ volts
C. e = lv sinѲ volts
D. e = Bl sinѲ volts
Ans.: A
Q.8 Hysteresis loss appears in the form of___ the magnetic materials.
A. heat and raises the temperature
B. only heat
C. only temperature raises
D. none of the above
Ans.: A
Q. 9 The word hysteresis means__.
A. leading
B. lagging
C. unity
D. any of the above
Ans.: B
Q. 10 which of the following is/are types of self induced emf?
A. self induced emf
B. mutually induced emf
C. Both A and B
D. none f the above
Ans.: C
Q. 11 what is self induced emf?
A. The emf induced in a coil due to the change of flux linking with itself.
B. the emf induced in a coil due to change of flux linking with near coil
C. Both A and B
D. none of the above
Ans.: A
Q. 12 The emf induced in a coil due to change of flux produced by another coil linking with it is called as____
A. self induce emf
B. dynamically induced emf
C. mutually induced emf
D. statically induced emf
Ans.: C
Q. 13 Generators works on the principle of___.
A. self induced emf
B. dynamically induced emf
C. statically induced emf
D. any of the above
Ans.: B
Q. 14 Transformers works on the principle of__.
A. statically induced emf
B. dynamically induced emf
C. mutually induced emf
D. any of the above
Ans.: C
Q. 15 The property of a coil due to which it opposes the change of current flowing through it is called as___.
A. self induced emf
B. self inductance of the coil or circuit
C. dynamically induced emf
D. none of the above
Ans.: B