Inductance Quiz | Inductance Multiple Choice Questions and Answers

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

Answer: Zero
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

Answer: 750H
4 Practical application of mutual inductance is ____________
A Transformer
B Capacitor
C AC generator
D DC generator

Answer: Transformer
5 The capacitor doesn’t allow sudden changes in ___________
A Capacitance
B Voltage
C Current
D Resistance

Answer: Voltage
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

Answer: 506.25W
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

Answer: 5.9 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

Answer: 0.5 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

Answer: 0.02 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

Answer: 100 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

Answer: 120 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

Answer: Inductance
15 For a purely inductive circuit which of the following is true ?
A Actual power of the circuit is zero
B Relative power
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

Answer: Lenz
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

Answer: 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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