Inductance Quiz | Inductance Objective Type Questions and Answers

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Questions
21 The direction of induced e.m.f. can be found by
A Laplace’s law
B Lenz’s law
C Fleming’s right hand rule
D Kirchhoff s voltage law

Answer: Lenz’s law
22 If current in a conductor increases then according to Lenz’s law self-induced voltage will
A produce current opposite to the in-creasing current
B aid the applied voltage
C tend to decrease the amount of cur-rent
D aid the increasing current

Answer: produce current opposite to the in-creasing current
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23 Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
A doubled
B halved
C quadrupled
D unaffected

Answer: doubled
24 An open coil has
A infinite resistance and zero inductance
B infinite resistance and normal inductance
C zero resistance and inductance
D zero resistance and high inductance

Answer: infinite resistance and zero inductance
25 In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
A remain the same
B increase
C decrease
D initially increase and then decrease

Answer: decrease
26 Higher the self-inductance of a coil,
A longer the delay in establishing steady current through it
B greater the flux produced by it
C lower the e.m.f. induced
D lesser its weber-turns

Answer: longer the delay in establishing steady current through it
27 The inductance of a coil will increase under all the following conditions except
A when more length for the same number of turns is provided
B when the number of turns of the coil increase
C when more area for each turn is provided
D when permeability of the core increases

Answer: when more length for the same number of turns is provided
28 Which of the following circuit element stores energy in the electromagnetic field ?
A Inductance
B Resistance
C Variable resistor
D Condenser

Answer: Inductance
29 As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
A moves parallel to the direction of the magnetic field
B cuts magnetic flux
C lies perpendicular to the magnetic flux
D lies in a magnetic field

Answer: cuts magnetic flux
30 The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
A self-inductance
B mutual inductance
C series aiding inductance
D capacitance

Answer: self-inductance
31 The four factors determining inductance are the number of turns, coil length, coil area, and:
A permeability
B reluctance
C counter emf
D coefficient of coupling

Answer: permeability
32 What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?
A 150 turns
B 1920 turns
C 900 turns
D 75 turns

Answer: 150 turns
33 Which two values are plotted on a B-H curve graph?
A flux density and magnetizing force
B magnetizing force and permeability
C permeability and reluctance
D reluctance and flux density

Answer: flux density and magnetizing force
34 A magnetic field has:
A lines of force
B magnetomotive force
C polar fields
D lines of reluctance

Answer: lines of force
35 Electromagnetism is the:
A current in the coil
B action between a permanent and an artificial magnet
C magnetic field action with a current-carrying wire
D magnetic field caused by a permanent magnet

Answer: magnetic field action with a current-carrying wire
36 What is the permeability of transformer iron?
A 5,500
B 1,500
C 450
D 50

Answer: 5,500
37 The polarity of induced voltage while a field is collapsing is:
A opposite to the force creating it
B independent of the force creating it
C identical to the force creating the field
D present only if the force is stationary

Answer: opposite to the force creating it
38 What does Faraday's law concern?
A a magnetic field cutting a conductor
B a magnetic field in a conductor
C a magnetic field in a coil
D a magnetic field hystersis

Answer: a magnetic field cutting a conductor
39 A henry value divided by a circuit resistive value provides the:
A induced voltage amplitude
B quality factor of the coil
C counter emf value
D rise or decay time constant

Answer: induced voltage amplitude
40 Faraday's law states that the:
A emf depends on the rate of cutting flux
B emf is related to the direction of the current
C direction of an induced current produces an aiding effect
D direction of the induced voltage produces an opposition

Answer: emf depends on the rate of cutting flux

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