Electrical Engineering MCQs

Option A: Above 220 kv

Option B: Above 11kv

Option C: Below 660 v

Option D: Below 115 v

Correct Answer: Below 660 v ✔

Option A: inductance

Option B: voltage

Option C: capacitance

Option D: None of these

Correct Answer: capacitance ✔

Option A: Cost

Option B: Durability

Option C: Compliance with performance criteria as laid down in specifications

Option D: All of the above

Correct Answer: All of the above ✔

Option A: 6×10-19

Option B: 6.25×1018

Option C: 1.6×1019

Option D: 6.25×10-18

Correct Answer: B. 6.25×10¹⁸ ✔

Option A: inlet pressure increase

Option B: speed shoots up

Option C: exhaust gets choked

Option D: steam flow gets clogged

Correct Answer: speed shoots up ✔

A. Wavemeter
B. Viscometer
C. Wattmeter
D. None of these

Submitted by: Rashid Mehmood

A wattmeter is an electrical instrument which is used to measure the electric power (in watts) of any electrical circuit.
Voltmeter – is used to measure electric potential difference between two points,
Wavemeter – is used to measure the wavelength of a radiowave,
Viscometer – is used measure viscosity of liquid.

Correct Answer: C. Wattmeter ✔

Option A: double

Option B: half

Option C: four times

Option D: remains same

Correct Answer: four times ✔

Option A: 9x107N

Option B: 900N

Option C: 9x105N

Option D: 9x106N

Correct Answer: 900N ✔

Option A: 1/4th of its original value

Option B: 1/8th of its original value

Option C: 4 times of its original value

Option D: 8 times of its original value

Correct Answer: 4 times of its original value ✔

Option A: Neutrons

Option B: X-rays

Option C: Both glass rod and silk acquire a negative charge

Option D: None

Correct Answer: None ✔

Option A: The surface is held parallel to the electric field

Option B: The surface is held perpendicular to the electric field

Option C: The surface makes an angle of 45°with the field

Option D: All of the above

Correct Answer: The surface is held perpendicular to the electric field ✔

Option A: imaginary

Option B: physically existing every where

Option C: physically existing near the charges

Option D: depends upon case

Correct Answer: imaginary ✔

Option A: The potential difference remains constant capacittance and energy stored increases

Option B: The potential difference remains constant capacittance decreases and energy increases

Option C: The potential difference decreases but both capacitance and energy increase

Option D: both potential difference and capacitance decrease but energy increases

Correct Answer: The potential difference decreases but both capacitance and energy increase ✔

Option A: 900 volts

Option B: 9000 volts

Option C: 90 volts

Option D: zero

Correct Answer: 9000 volts ✔

Option A: in the direction of electric intensity

Option B: against electric intensity

Option C: in any direction

Option D: in the direction of electric flux

Correct Answer: against electric intensity ✔

Option A: voltage applied

Option B: thickness of the capacitor plates

Option C: geometry of the capacitor

Option D: dinsity of the capacitor plates

Correct Answer: geometry of the capacitor ✔

Option A: 2.5 x 10-8 C

Option B: 10-5 C

Option C: 103 C

Option D: 4 x 103 C

Correct Answer: 10-5 C ✔

Option A: series combination

Option B: parallel combination

Option C: both series and parallel combinations

Option D: none of above

Correct Answer: parallel combination ✔

Option A: 6.2 x 1018

Option B: 1.6 x 1019

Option C: 6.2 x 1021

Option D: 1.6 x 10-27

Correct Answer: 6.2 x 1018 ✔

Option A: Nm2C2

Option B: N-1mC-2

Option C: NmC-1

Option D: N-1m-2C2

Correct Answer: N-1m-2C2 ✔

Option A: Less than unity

Option B: Equal to the unit

Option C: Larger than unit

Option D: No hard and fast rule

Correct Answer: Larger than unit ✔

Option A: F/A

Option B: V/A

Option C: VF/A

Option D: q/VA

Correct Answer: V/A ✔

Option A: 1/4IIɛ q/r

Option B: q/ɛ0

Option C: 1/4IIɛ0. q/r2

Option D: 4IIɛ0

Correct Answer: q/ɛ0 ✔

Option A: V/A

Option B: J/V

Option C: V/m

Option D: A/m

Correct Answer: V/m ✔

Option A: Electrostatics

Option B: Charges in motion

Option C: Capacitors

Option D: Electric fields

Correct Answer: Electrostatics ✔

Option A: Radius decreases

Option B: Balloon bursts

Option C: Radius increase

Option D: Balloon squeezes

Correct Answer: Radius increase ✔

Option A: Remains same

Option B: First increases then decreases

Option C: Decreases then increases

Option D: Increases for a while

Correct Answer: Increases for a while ✔

Option A: Decreases 9 times

Option B: Increases 9 times

Option C: Increases 4 times

Option D: Decreases 4 times

Correct Answer: Increases 4 times ✔

Option A: increases

Option B: decreases

Option C: increases then decreases

Option D: decreases then increases

Correct Answer: increases ✔

Option A: Spiral path

Option B: Straight line

Option C: Curved path

Option D: Circular path

Correct Answer: Straight line ✔

Option A: Semiconductor

Option B: Photodiode

Option C: Light emitting diode

Option D: Capacitor

Correct Answer: Photodiode ✔

Option A: magnetic hield

Option B: electric field

Option C: nuclear field

Option D: gravitational field

Correct Answer: electric field ✔

Option A: direct current

Option B: alternating current

Option C: both for the direct and alternating current

Option D: none of above

Correct Answer: direct current ✔

Option A: 200J

Option B: 100J

Option C: 1000J

Option D: 100 eV

Correct Answer: 100J ✔

Option A: zero

Option B: infinite

Option C: positive

Option D: negative

Correct Answer: zero ✔

Option A: Net torque

Option B: Net force

Option C: both series and parallel combinations

Option D: zero

Correct Answer: both series and parallel combinations ✔

Option A: positively charged

Option B: electrically neutral

Option C: negatively charged

Option D: positively and negatively charged

Correct Answer: electrically neutral ✔

Option A: 4 volts

Option B: 9 volts

Option C: 2 volts

Option D: 1 vol

Correct Answer: 2 volts ✔

Option A: 2 x 106m/sec

Option B: 3 x 106m/sec

Option C: 5 x 106m/sec

Option D: 4 x 106m/sec

Correct Answer: 3 x 106m/sec ✔

Option A: parallel to one another

Option B: non parallel to one another

Option C: intersecting

Option D: circular

Correct Answer: parallel to one another ✔

Option A: charge will flow from A to B

Option B: charge will flow from B to A

Option C: no flow of charge will occur

Option D: both a and b are possible

Correct Answer: charge will flow from A to B ✔

Option A: 9 x 109N

Option B: 9.2 x 104N

Option C: 9 x 109N

Option D: 9 x 107N

Correct Answer: 9 x 109N ✔

Option A: negative

Option B: positive

Option C: zero

Option D: data is insufficient

Correct Answer: zero ✔

Option A: along the direction of force experienced by a unit positive charge

Option B: opposite to the direction of force experienced by a unit positive charge

Option C: perpendicular to the direction of force experienced by a uit positive charge

Option D: any of above

Correct Answer: along the direction of force experienced by a unit positive charge ✔

Option A: only a magnetic field

Option B: only an electric field

Option C: neither electric field nor magnetic field

Option D: both electric and magnetic fields

Correct Answer: only an electric field ✔

Option A: electric flux

Option B: electric intensity

Option C: electric potential

Option D: all of above are same

Correct Answer: electric intensity ✔

Option A: decrease

Option B: increase

Option C: remain constant

Option D: depends upon composition of dielectric

Correct Answer: decrease ✔

Option A: 1.6 x 10-19C

Option B: 3.2 x 10-19C

Option C: 9.1 x 109C

Option D: no definite value exist

Correct Answer: 1.6 x 10-19C ✔

Option A: glass rod acquires negative charge while silk acquires positive charge

Option B: glass rod acquires positive charge while silk acquires negative charges

Option C: both glass rod and silk acquire negative charge

Option D: both glass rod and silk acquire positive charge

Correct Answer: glass rod acquires positive charge while silk acquires negative charges ✔

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 ✔

Option A: 0 V

Option B: 5.97 V

Option C: 6 V

Option D: 597 mV

Correct Answer: 5.97 V ✔

Option A: 459 Hz

Option B: 4,591 Hz

Option C: 999 Hz

Option D: 2,176 Hz

Correct Answer: 4,591 Hz ✔

Option A: 125 Hz

Option B: 1,250 Hz

Option C: 564 Hz

Option D: 5,644 Hz

Correct Answer: 125 Hz ✔

Option A: 333 kHz

Option B: 633 kHz

Option C: 331 kHz

Option D: 60 kHz

Correct Answer: 633 kHz ✔

Option A: 0 Hz to 3.5 kHz

Option B: 0 Hz

Option C: 3.5 kHz

Option D: 7 kHz

Correct Answer: 0 Hz to 3.5 kHz ✔

Option A: 81 µF

Option B: 161 µF

Option C: 0.161 µF

Option D: 220 µF

Correct Answer: 161 µF ✔

Option A: a higher impedance

Option B: a smaller bandwidth

Option C: a higher resonant frequency

Option D: a larger bandwidth

Correct Answer: a larger bandwidth ✔

Option A: 10.60 V

Option B: 0 V

Option C: 21.21 V

Option D: 15 V

Correct Answer: 10.60 V ✔

Option A: 12.73 V peak-to-peak

Option B: 18 V peak-to-peak

Option C: 9 V peak-to-peak

Option D: zero

Correct Answer: 18 V peak-to-peak ✔

Option A: 18 V peak-to-peak

Option B: zero

Option C: 9 V peak-to-peak

Option D: 12.74 V peak-to-peak

Correct Answer: zero ✔