Electromagnetic Induction MCQs

Option A: ωB/r22-r12/Δt

Option B: ωB(r2-r1)2/Δt

Option C: ωB(r22-r12)/Δt

Option D: ωB(r22+r12)/Δt

Correct Answer: ωB(r22-r12)/Δt ✔

Option A: μoN2A

Option B: μoN2/A

Option C: μoN2

Option D: BA

Correct Answer: μoN2A ✔

Option A: 1Hzs

Option B: 1.5Hzs

Option C: 106sec

Option D: 1sec

Correct Answer: 1Hzs ✔

Option A: current flowing

Option B: number of turns per unit length

Option C: voltage produce

Option D: all

Correct Answer: all ✔

Option A: LI2

Option B: L2I/2

Option C: LI2/2

Option D: IL2

Correct Answer: LI2 ✔

Option A: A D.C source

Option B: an A.C source

Option C: any source

Option D: all of the above

Correct Answer: A D.C source ✔

Option A: carbon brushes

Option B: coil

Option C: commutator

Option D: magnetic field

Correct Answer: commutator ✔

Option A: Vs/Vp = Np/Ns

Option B: Vs/Vp = Ns/Np

Option C: Vp/Vs = Ns/Np

Option D: Vp/Vs = Np/Ns

Correct Answer: Vs/Vp = Ns/Np ✔

Option A: 0 volt

Option B: 3.125 volt

Option C: 31.25 volt

Option D: 0.03125 volt

Correct Answer: 0.03125 volt ✔

Option A: Decreases the resistance of the solenoid

Option B: Reduces the effect of eddy current

Option C: Improves the flux linkage between the turns of the coil

Option D: Increases the mutual inductance between the solenoid and the core

Correct Answer: Improves the flux linkage between the turns of the coil ✔

Option A: 150msec-1

Option B: 384msec-1

Option C: 38.4msec-1

Option D: 200msec-1

Correct Answer: 384msec-1 ✔

Option A: Mutual inductance

Option B: Self inductance

Option C: Magnetic fields

Option D: Heating effect

Correct Answer: Self inductance ✔

Option A: Galvanometer

Option B: Ammeter

Option C: Voltmeter

Option D: Transformer

Correct Answer: Transformer ✔

Option A: Step down

Option B: Input voltage and output voltage remain same

Option C: Step up

Option D: Amplifier is used

Correct Answer: Step up ✔

Option A: Retaintivity

Option B: Permeability

Option C: Flux

Option D: Hysteresis

Correct Answer: Hysteresis ✔

Option A: Maximum

Option B: Zero

Option C: Intermediate values

Option D: No back emf

Correct Answer: Maximum ✔

Option A: Lenzs law

Option B: Faradays law

Option C: Mutual induction

Option D: Law of conservation of power

Correct Answer: Mutual induction ✔

Option A: Induced current

Option B: Eddy current

Option C: Back emf

Option D: None of the above

Correct Answer: Eddy current ✔

Option A: 3-Jan

Option B: 3

Option C: 1

Option D: 6

Correct Answer: 3 ✔

Option A: D.C voltage

Option B: A.C voltage

Option C: Half A.C voltage

Option D: Half D.C voltage

Correct Answer: A.C voltage ✔

Option A: Static charge

Option B: Soft iron

Option C: Semi-conductor

Option D: Accelerating charge

Correct Answer: Accelerating charge ✔

Option A: producing heat

Option B: producing light

Option C: Magnetizing iron

Option D: Producing magnetic field

Correct Answer: Magnetizing iron ✔

Option A: A torque about horizontal axis

Option B: A torque about vertical axis

Option C: An upward force along the axis

Option D: No resultant force

Correct Answer: No resultant force ✔

Option A: Magnetic flux density

Option B: Torque

Option C: Mutual induction

Option D: Motional emf

Correct Answer: Magnetic flux density ✔

Option A: ms-1A

Option B: ms-2A-1

Option C: kgms2A-1

Option D: kgm2s-1A-1

Correct Answer: kgm2s-1A-1 ✔

Option A: Small output

Option B: Eddy currents and magnetic hysterias

Option C: Soft iron core

Option D: Back emf

Correct Answer: Eddy currents and magnetic hysterias ✔

Option A: effect in charging a capacitor

Option B: effect in charging a battery

Option C: effect while passing through an inductance

Option D: heating effect through a resistance

Correct Answer: heating effect through a resistance ✔

Option A: transformer

Option B: motor

Option C: D.C generator

Option D: A.C generator

Correct Answer: transformer ✔

Option A: AC

Option B: DC

Option C: Both A and B

Option D: none of these

Correct Answer: DC ✔

Option A: decrease

Option B: become zero

Option C: remain the same

Option D: increase

Correct Answer: increase ✔

Option A: galvanometer

Option B: ammeter

Option C: voltmeter

Option D: all of the above

Correct Answer: all of the above ✔

Option A: producing heat

Option B: producing light

Option C: magnetizing and electroplating

Option D: all the above

Correct Answer: magnetizing and electroplating ✔

Option A: galvanometer

Option B: ammeter

Option C: voltmeter

Option D: all of above

Correct Answer: all of above ✔

Option A: fluctuates off and on

Option B: varies in magnitude alone

Option C: changes its direction again and again

Option D: changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

Correct Answer: changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals. ✔

Option A: maximum magnetic flux

Option B: rate of change of magnetic flux

Option C: change in magnetic flux

Option D: initial magnetic flux

Correct Answer: rate of change of magnetic flux ✔

Option A: Magnetic field intensity

Option B: magnetic induction

Option C: magnetic flux

Option D: self-inductance

Correct Answer: magnetic flux ✔

Option A: producing heat

Option B: producing light

Option C: magnetizing and electroplating

Option D: all the above

Correct Answer: magnetizing and electroplating ✔

Option A: mechanical energy into electrical energy

Option B: electrical energy into mechanical energy

Option C: magnetic energy into mechanical energy

Option D: magnetic energy into electrical energy

Correct Answer: mechanical energy into electrical energy ✔

Option A: number of turns in the coil

Option B: magnetic field strength

Option C: frequency of rotation

Option D: all of above

Correct Answer: all of above ✔

Option A: A.C current

Option B: D.C current

Option C: induced current

Option D: mean square current

Correct Answer: induced current ✔

Option A: A.C generator

Option B: D.C dynamo

Option C: induction coil

Option D: transformer

Correct Answer: transformer ✔

A. Yes
B. No

Correct Answer: Yes ✔

A. Yes
B. No

Correct Answer: Yes ✔

A. Yes
B. No

Correct Answer: No ✔

Option A: Resistance only

Option B: Inductance only

Option C: Capacitance only

Option D: Inductance and capacitance

Correct Answer: Inductance only ✔

Option A: variation in coil current

Option B: variation in voltage to the coil

Option C: change of number of turns of coil

Option D: the resistance of magnetic path

Correct Answer: variation in voltage to the coil ✔

Option A: unchanged inductance

Option B: increased inductance

Option C: zero inductance

Option D: reduced inductance

Correct Answer: reduced inductance ✔

Option A: self-inductance of two coils only

Option B: mutual inductance between two coils only

Option C: mutual inductance and self inductance of two coils

Option D: none of the above

Correct Answer: mutual inductance and self inductance of two coils ✔

Option A: 5 mH

Option B: 10 mH

Option C: 5 H

Option D: 10 H

Correct Answer: 5 H ✔

Option A: 3500 mH

Option B: 350 mH

Option C: 250 mH

Option D: 150 mH

Correct Answer: 350 mH ✔

Option A: 100 N

Option B: 400 N

Option C: 600 N

Option D: 1000 N

Correct Answer: 100 N ✔

Option A: 20 Wb

Option B: 2 Wb

Option C: 0.2 Wb

Option D: 0.02 Wb

Correct Answer: 2 Wb ✔

Option A: 300 uH

Option B: 600 uH

Option C: 150 uH

Option D: 75 uH

Correct Answer: 300 uH ✔

Option A: Air core

Option B: Laminated iron core

Option C: Iron core

Option D: Powdered iron core

Correct Answer: Air core ✔

Option A: 0.01 s

Option B: 0.1 s

Option C: 0.5 s

Option D: 5 s

Correct Answer: 0.5 s ✔

Option A: 50 ohms

Option B: 500 ohms

Option C: 1000 ohms

Option D: 5000 ohms

Correct Answer: 5000 ohms ✔

Option A: 50 N

Option B: 120 N

Option C: 240 N

Option D: 480 N

Correct Answer: 120 N ✔

Option A: 10 V

Option B: 15 V

Option C: 25V

Option D: 50V

Correct Answer: 25V ✔

Option A: 6 H

Option B: 8 H

Option C: 12 H

Option D: 24 H

Correct Answer: 12 H ✔

Option A: induced current

Option B: charge

Option C: energy

Option D: induced e.m.f.

Correct Answer: energy ✔

Option A: 2.0

Option B: 1.0

Option C: 0.5

Option D: zero

Correct Answer: 1.0 ✔

Option A: 6 mH

Option B: 14 mH

Option C: 24 mH

Option D: 48 mH

Correct Answer: 48 mH ✔

Option A: 4 mH

Option B: 5 mH

Option C: 6 mH

Option D: 12 mH

Correct Answer: 6 mH ✔

Option A: voltage across the inductance

Option B: magnetic field

Option C: both A. and B.

Option D: neither (A) nor (B)

Correct Answer: magnetic field ✔

Option A: Apparent power is zero

Option B: Relative power is.zero

Option C: Actual power of the circuit is zero

Option D: Any capacitance even if present in the circuit will not be charged

Correct Answer: Actual power of the circuit is zero ✔

Option A: 64 A/s

Option B: 32 A/s

Option C: 16 A/s

Option D: 4 A/s

Correct Answer: 4 A/s ✔

Option A: 32 mH

Option B: 38 mH

Option C: 40 mH

Option D: 48 mH

Correct Answer: 38 mH ✔

Option A: 3 mH

Option B: 12 mH

Option C: 24mH

Option D: 48mH

Correct Answer: 3 mH ✔

Option A: Ohm

Option B: Henry

Option C: Ampere turns

Option D: Webers/metre

Correct Answer: Henry ✔

Option A: Capacitance

Option B: Inductance

Option C: Resistance

Option D: All of the above

Correct Answer: Inductance ✔

Option A: more wire can be used with less D.C. resistance in coil

Option B: the laminations are insulated from each other

Option C: the magnetic flux is concentrated in the air gap of the core

Option D: the laminations are stacked vertfcally

Correct Answer: the laminations are insulated from each other ✔

Option A: flux density of the magnetic field

Option B: amount of flux cut

Option C: amount of flux linkages

Option D: rate of change of flux-linkages

Correct Answer: rate of change of flux-linkages ✔

Option A: Henry

Option B: Coulomb/volt ampere

Option C: Volt second per ampere

Option D: All of the above

Correct Answer: Coulomb/volt ampere ✔

Option A: permeability of the core

Option B: the number of their turns

Option C: cross-sectional area of their common core

Option D: all of the above

Correct Answer: all of the above ✔

Option A: Faraday

Option B: Lenz

Option C: Newton

Option D: Coulomb

Correct Answer: Lenz ✔

Option A: aid the increasing current

Option B: tend to decrease the amount of cur-rent

Option C: produce current opposite to the in-creasing current

Option D: aid the applied voltage

Correct Answer: produce current opposite to the in-creasing current ✔

Option A: hysteresis losses

Option B: eddy current losses

Option C: both (A) and (B)

Option D: none of the above

Correct Answer: both (A) and (B) ✔

Option A: self-inductance

Option B: mutual inductance

Option C: series aiding inductance

Option D: capacitance

Correct Answer: self-inductance ✔

Option A: Laplace’s law

Option B: Lenz’s law

Option C: Fleming’s right hand rule

Option D: Kirchhoff s voltage law

Correct Answer: Lenz’s law ✔

Option A: zero resistance and inductance

Option B: infinite resistance and zero inductance

Option C: infinite resistance and normal inductance

Option D: zero resistance and high inductance

Correct Answer: infinite resistance and zero inductance ✔

Option A: when more length for the same number of turns is provided

Option B: when the number of turns of the coil increase

Option C: when more area for each turn is provided

Option D: when permeability of the core increases

Correct Answer: when more length for the same number of turns is provided ✔

Option A: lies perpendicular to the magnetic flux

Option B: lies in a magnetic field

Option C: cuts magnetic flux

Option D: moves parallel to the direction of the magnetic field

Correct Answer: cuts magnetic flux ✔

Option A: increase

Option B: decrease

Option C: remain the same

Option D: initially increase and then decrease

Correct Answer: decrease ✔

Option A: unaffected

Option B: doubled

Option C: halved

Option D: quadrupled

Correct Answer: doubled ✔

Option A: lesser its weber-turns

Option B: lower the e.m.f. induced

Option C: greater the flux produced by it

Option D: longer the delay in establishing steady current through it

Correct Answer: longer the delay in establishing steady current through it ✔

Option A: Inductance

Option B: Condenser

Option C: Variable resistor

Option D: Resistance

Correct Answer: Inductance ✔