Electromagnetic Induction(Electrical Engineering Questions ) Questions and Answers
Question 1. A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?
ωB/r22-r12/Δt
ωB(r2-r1)2/Δt
ωB(r22-r12)/Δt
ωB(r22+r12)/Δt
Explanation:-
Answer: Option C. -> ωB(r22-r12)/Δt NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is_______________?
1Hzs
1.5Hzs
106sec
1sec
Explanation:-
Answer: Option A. -> 1Hzs NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. Self-inductance of a long solenoid is______________?
μoN2A
μoN2/A
μoN2
BA
Explanation:-
Answer: Option A. -> μoN2A NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. For electroplating we use_________________?
A D.C source
an A.C source
any source
all of the above
Explanation:-
Answer: Option A. -> A D.C source NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Energy stored in a magnetic field is given by______________?
LI2
L2I/2
LI2/2
IL2
Explanation:-
Answer: Option C. -> LI2/2 NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The only difference between construction of D.C generator and A.C generator is that of_______________?
carbon brushes
coil
commutator
magnetic field
Explanation:-
Answer: Option C. -> commutator NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
Vs/Vp = Np/Ns
Vs/Vp = Ns/Np
Vp/Vs = Ns/Np
Vp/Vs = Np/Ns
Explanation:-
Answer: Option B. -> Vs/Vp = Ns/Np NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. Self inductance of a coil depends upon________________?
current flowing
number of turns per unit length
voltage produce
all
Explanation:-
Answer: Option D. -> all NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?
0 volt
3.125 volt
31.25 volt
0.03125 volt
Explanation:-
Answer: Option D. -> 0.03125 volt NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?
Decreases the resistance of the solenoid
Reduces the effect of eddy current
Improves the flux linkage between the turns of the coil
Increases the mutual inductance between the solenoid and the core
Explanation:-
Answer: Option C. -> Improves the flux linkage between the turns of the coil NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!