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Free download in PDF Inductance Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The phenomenon due to which there is an induced current in one coil due to the current in a neighbouring coil is?
[A]
Mutual inductance
[B]
Steady current
[C]
Electromagnetism
[D]
Susceptance
Answer: Mutual inductance
(2)
If the current in one coil becomes steady, the current in neighbouring coil is?
[A]
Halves
[B]
Zero
[C]
Doubles
[D]
Infinity
(3)
If the flux linkage in coil 1 is 3Wb and it has 500 turns and the current in coil 2 is 2A, calculate the mutual inductance.
[A]
900H
[B]
750H
[C]
450H
[D]
500H
(4)
Practical application of mutual inductance is ____________
[A]
Transformer
[B]
Capacitor
[C]
AC generator
[D]
DC generator
(5)
The capacitor doesn’t allow sudden changes in ___________
[A]
Capacitance
[B]
Voltage
[C]
Current
[D]
Resistance
(6)
If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.
[A]
506.25W
[B]
50625W
[C]
50.625W
[D]
None of these
(7)
Electricity may be generated by a wire:
[A]
carrying current
[B]
wrapped as a coil
[C]
that has neutral domains
[D]
passing through a flux field
Answer: passing through a flux field
(8)
In the given circuit, what will the voltage be across R3 25 s after the switch is moved to position 2?
[A]
5.9 V
[B]
14 V
[C]
8.34 V
[D]
2.88 V
(9)
A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
[A]
0.5 s
[B]
5 s
[C]
0.1 s
[D]
0.01 s
(10)
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
[A]
0.02 Wb
[B]
0.2 Wb
[C]
20 Wb
[D]
2 Wb
(11)
The co-efficient of coupling between two air core coils depends on
[A]
mutual inductance and self inductance of two coils
[B]
self-inductance of two coils only
[C]
mutual inductance between two coils only
[D]
none of the mentioned
Answer: mutual inductance and self inductance of two coils
(12)
Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.
[A]
1000 N
[B]
400 N
[C]
100 N
[D]
600 N
(13)
A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be
nearly
[A]
120 N
[B]
50 N
[C]
480 N
[D]
240 N
(14)
Which of the following circuit elements will oppose the change in circuit current ?
[A]
Inductance
[B]
Resistance
[C]
Capacitance
[D]
All of the above
(15)
For a purely inductive circuit which of the following is true ?
[A]
Actual power of the circuit is zero
[B]
Relative power is.zero
[C]
Any capacitance even if present in the circuit will not be charged
[D]
Apparent power is zero
Answer: Actual power of the circuit is zero
(16)
Which of the following is not a unit of inductance ?
[A]
Coulomb/volt ampere
[B]
Volt second per ampere
[C]
Henry
[D]
All of the above
Answer: Coulomb/volt ampere
(17)
The law that the induced e.m.f. and current always oppose the cause producing them is due to
[A]
Lenz
[B]
Newton
[C]
Faraday
[D]
Coulomb
(18)
A laminated iron core has reduced eddy-current losses because
[A]
the laminations are insulated from each other
[B]
the magnetic flux is concentrated in the air gap of the core
[C]
the laminations are stacked vertfcally
[D]
more wire can be used with less D.C. resistance in coil
Answer: the laminations are insulated from each other
(19)
Mutually inductance between two magnetically-coupled coils depends on
[A]
cross-sectional area of their common core
[B]
the number of their turns
[C]
permeability of the core
[D]
all of the above
(20)
The magnitude of the induced e.m.f. in a conductor depends on the
[A]
rate of change of flux-linkages
[B]
amount of flux linkages
[C]
amount of flux cut
[D]
flux density of the magnetic field
Answer: rate of change of flux-linkages
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