Contents show

Electrical Engineering MCQs with Answers

Electrical Engineering MCQs helps to pass the initial tests of Army Lady Officers who want to join Pak Army through Lady Cadet Corps (LCC), Engineering Branch of PAF or Naval Commission.

If you have a degree in Electrical Engineering, then you may study all questions given below which are very helpful as past experience or past papers of LCC and other initial tests of PAF and Navy.

Welcome

Shaheen Forces Academy

We expect 100% result.

Click on Start Button.

Your time is Ended. Thanks

Electrical Engineering Quiz

In a lead acid cell, hydrogen is liberated at:-

None of them

negative plate

Both a, b

Positive plate

A light dependent resistor is:-

Power resistor

Non metallic resistor

Variable resistor

Specific resistance of a substance is measured in:-

Mhos

Ohms

ohm-cm

A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?

330 Ω

100 kΩ

1 MΩ

1 kΩ

The efficiency of a modern accumulator is of order of;-

33%

50%

70%

100%

In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a D.C. load of _____?

RC + RL

RC || RL

A battery cell having an emf of 2.2 volts and an internal resistance of 0.03 ohms is connected to an external resistance of 0.10 ohms. The short circuit current is:-

55.2 A

73.3 A

66.1 A

____________ is most commonly used for making magnetic recording tape:-

Silver nitrate

Silicon iron

Ferric oxide

Material having electrical conductivity much less than most of the metal but much greater than of typical insulator, are known as:-

Thermistors

Semi conductors

Varistors

A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is____?

200 Ω

1,029 Ω

880 Ω

680 Ω

Power amplifiers generally use transformer coupling because transformer permits______?

Distortion less output

Good frequency response

Cooling of the circuit

Impedance matching

A resistance of 5 ohm is further drawn so that its length becomes double. Its resistance will now be:-

20 ohm

.7.5 ohm

10 ohm

5 ohm

The output power of a transistor amplifier is more than the input power because the additional power is supplied by____?

Biasing circuit

Transistor

Collector supply VCC

None of the above

The switch that has the fastest speed of operation is _____ switch?

Mechanical

Electronic

None of the above

Electromechanical

A source whose no load voltage is 220 V delivers watts to a load when the current is 0.4 A. The maximum power than can be delivered by the source is:-

102 W

242 W

152 W

51 W

In a particular biasing circuit, the value of RE is about ______?

100 kO

1 MO

10 kO

800 O

__________ is the main constituent of glass;-

SiO2

Al2O3

Fe2O3

Voltage dependent resistors are made from:-

Charcoal

Silicon carbide

Graphite

The equivalent resistance of 2 N branches in parallel , each having resistance of N/2 ohms will be:-

1 ohm

1/4 ohm

2 ohm

4 ohm

The disadvantage of impedance matching is that it _____?

Gives low power output

None of the above

Requires a transformer

Gives distorted output

A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?

12 V

10.9 V

1.1 V

1.09 V

One would find a clamping circuit in ____?

Radio Receiver

Receiving Antenna

Television Receiver

Radio Transmitter

Two loads X and Y, are connected in parallel to a 115 V supply. Load X takes 35 watts and the total current is 2.6 A. The resistance of the X is:-

233 ohm

379 ohm

291 ohm

In conductors , conduction of electricity take place due to movement of:-

Electrons

Positive ions

Negative ions

When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read____?

Zero volts

Twice the source voltage

Half the source voltage

the same as the source voltage

Your score is

Check also: Join Pak Army as an Officer through Lady Cadet Course

Electrical Engineering MCQs

Electrical Engineering MCQs (Part-01)

Which of the given motor has insufficient starting torque at full load speed with the same H.P. ratings?

Three-phase Induction motor
Shunt motor
Synchronous motor
Differential compound motor

Answer: Option d.

Which of the given networks are based on the compensation theorem?

Unilateral network
Bilateral network
Linear and non-linear network
Distributed network

Answer: Option c.

The ratio of the Mechanical Impedance is

RMS force to RMS displacement
RMS velocity to RMS acceleration
RMS force to RMS velocity
RMS current to RMS speed

Answer: c

In a two-wattmeter method, the measured power was 40kW At 0.8 lagging power factor. Calculate the reading of each wattmeter

W₁= 34.875 and W₂ = 5.125
W₁= 33.875 and W₂ = 6.125
W₁ = 38.875 and W₂ = 6.125
W₁ = 32.875 and W₂ = 5.125

Answer: b

Under no-load conditions, the transmission line carrying a current because of

Heating effect
Capacitance effect
Chemical effect
Transmission effect

Answer: b

In a synchronous machine, the V curve is drawn between which of the given axis.

Field current on X-axis and no-load current on Y-axis
Armature current on X-axis and the no-load current in Y-axis
Field current on X-axis and armature current on Y-axis
Armature current on X-axis and filed current on Y-axis

Answer: c

The spot welding is used for

Joint thick sheets
Rough surface
Thin metal sheets(10-12mm)
T shape welding

Answer: c

In a 3-Ø induction motor, the starting current is 8 times the rated current, and the rated slip is 6 %, then find the ratio of starting torque to full load torque.

1
1.5
1.75
2

Answer: b

The single-phase reluctance machine works as a generator when the value of ? is

Infinitive
Zero
Unity
Positive

Answer: d

In a series circuit, the value of resistance is 40 ohm, and Inductance is 40mH . If the 100V of an A.C. source is connected to the circuit with 80Hz Frequency, find the value of current flowing through the resistance.

23 A
2.23 A
3.33 A
4.33 A

Answer: b

The Primary reason for D.C. motor Preferred over A.C. motor

Constant speed operation
High-speed operation
Variable speed operation
Low-speed operation

Answer: c

If the five bulbs having power ratings 5W,10W,25W,35W, and 50W, which one will have the highest resistance?

5W bulb
50W bulb
25W bulb
10W bulb

Answer: a

If the number of turns 4 times and length becomes double in a solenoid, and keeping the cross-sectional area are same, then find the ratio of Inductance (Older to newer).

Answer: d

Check also: Join Pakistan Air Force Aeronautical Branch

Electrical Engineering MCQs Book

Electrical Engineering MCQs (Part-02)

Find the term ratio of the bridge rectifier at 20V D.C. output when the supply voltage is 230V, 50Hz.

10:1
20:1
1:15
1:13

Answer: a

In the given 8085 microprocessor, the restart instruction(RST) is 8 instruction. What would be the transfer program execution to a given location?

(0020)_H
(0030)_H
(0040)_H
(0010)_H

Answer: c

The purpose of dummy coil in D.C. machine is

to reduce losses
to Improve machine efficiency
to maintain a mechanical balance of armature
to reduce the cost of the machine

Answer: c

The load factor of a plant is 0.8, and the capacity factor is 0.7. If the maximum demand on the plant is 600 MW, find the reserve capacity of the plan

Answer: b

A bulb of power rating 9kW draws a current 30 A. Find the applied Voltage

220 V
240 V
280 V
300 V

Answer: d

In the MKS system, the value of 3 kW is equal to

013Hp
3.013Hp
4.021Hp
5.021Hp

Answer: c

The resistivity of a conductor depends on

Length
Current
Voltage
Power

Answer: a

A 200 kVA transformer has a full load copper loss of 400 W and iron loss 200 W. The maximum efficiency of the transformer will occur when a total loss is

500 W
600 W
1500 W
1600 W

Answer: b

A 4 pole, three-phase induction motor is supplied by 50Hz frequency by a three-phase source. If the rotor of the motor rotates at 600 rpm, find the sli

Answer: c

TRIAC is operated at

Low Frequencies
Power Frequencies
High frequencies
All of these

Answer: b

Five thyristors each of 2000 V rating are connected in series with a power circuit of 5 V.K. Find the percentage series derating factor?

Answer: b

In an intrinsic semiconductor, the number of holes is ……. the number of electrons.

Equal to
More than
Less than
None of these

Answer: a

Find the value of emitter current of a transistor that has ADC = 0.5 and base current = 120 µA

01 mA
1.24 mA
0.04 mA
0.24mA

Answer: d

Check also: Join PAF Engineering Branch

Electrical Engineering MCQs for NTS

Electrical Engineering MCQs (Part-03)

Which of the given material is used for making light-emitting diodes?

Si
Ge
GaAs
Fe

Answer: c

Noise is a function of which of the given term

Momentum
Acceleration
Voltage
Bandwidth

Answer: d

The displacement measuring Instrument LVDT works on the principle of

Fleming Left-hand rule
Mutual Induction
Linear induction
Linear capacitance

Answer: b

Which of the given material does not change the resistance with varying temperature

Gallium
Manganin
Tungsten
Copper

Answer: b

In a power plant, the maximum demand is 100MW, and the sum of individual maximum demand is 70 M.W. Calculate the diversity factor

Answer: c

Which of the following is a series type unbalanced fault that occurs in a power system

Single line to double line fault
Double line to double line fault
The line to line fault
Open conductor fault

Answer: d

The three-phase oil circuit breaker rated as 2000 MVA, 66 K.V., 6 SEC. Find the making current

44 kA
19.43 kA
22.76 kA
27.55 kA

Answer: b

In a three-phase induction motor, the rotor power output is 20 kW, and the value of the corresponding slip is 8 %. Find the rotor copper loss of the motor

1288 W
1596 W
2033 W
2522 W

Answer: b

Which of the given relays can resist the possible major fault in the transformer

Current relay
Frequency relay
Buchholz relay
Overcurrent relay

Answer: c

In a three-phase transformer, the primary winding is delta connected, and the secondary winding is star connected, and the secondary to primary turn ratio per phase is 15. If 240 V is applied to the transformer’s primary side, find the secondary voltage of the transformer.

5532 V
6625 V
6235 V
7325 V

Answer: c

Which of the given diode is called hot-carrier dioxide?

N. junction diode
Schottky diode
Light-emitting diode
Zener diode

Answer: b

In a transformer, the humming sound is primarily due to

Overflow of oil
Magnetostriction
Flux leakage
Lamination of transformer

Answer: b

When a 20 A current flows for 6 minutes, calculate the amount of electricity transferred.

7200 C
6400 C
8400 C
5400 C

Answer: a

Find the barrier potential for Si junction diode at 100 C, calculate its value at 400 C is 0.9 V

75 V
0.96 V
1.20 V
0.60

Answer: b

Check also: How to prepare ISSB Tests?

Electrical Engineering MCQs for Job Test

Electrical Engineering MCQs (Part-04)

An induction machine is operated with frequencies that are given in the ratio 3:7 without changing the voltage. Find the starting torque of the machine for the given frequencies

Answer: b

The voltage range is non uniform. Its type is

Electrostatic instrument
Potentiometer
Galvanometer
Multimeter

Answer: a

Which of the given test is used for the calculation of the inertia of the rotor?

Sinners test(Back to Backtest)
Low voltage test
High Voltage test
Retardation test

Answer: d

A galvanometer having the value of coil resistance is 120 Ω gives a full-scale deflection when a current of 3mA is passed through it. Find the value of the resistance, which can convert a galvanometer into an ammeter, giving a full-scale deflection for a current of 12 A.

07 Ω
0.09 Ω
0.11 Ω
0.03 Ω

Answer: d

Find the numbers of address lines needed to address a memory size 64K

Answer: d

A 3 phase Induction motor having 70 Hz frequency draws a power of 80 kW from mains. If the stator losses are 4kW and rotor emf oscillates at 120 oscillations per minute, find the rotor copper losses

26 kW
0.54 kW
0.10 kW
0.99 kW

Answer: b

In an induction motor, crawling is caused by

High Voltage
Heavy loads
Harmonic produced in the motor
Improper design of machine

Answer: c

In a ferromagnetic material, the neighboring atomic magnetic moments are

Predominantly unequal in small regions of material.
Predominantly constant in small regions of material.
Predominantly unequal and parallel throughout the material.
Predominantly equal and parallel throughout the material.

Answer: d

N-type and P-type extrinsic semiconductors are formed by adding the impurities of which valency.

Tertavalent and pentavalent
Trivalent and pentavalent
Pentavalent and trivalent
Trivalent and tetravalent.

Answer: b

An 8 pole, 1600 rpm D.C. lap wound generator has 1680 conductors. If the flux per pole is 0.04 weber, find the emf of the generator.

1600 V
1792 V
1982 V
2020 V

Answer: c

The input voltage of a boost regulator is 8V, and the average output voltage is 24V. Find the duty cycle.

Answer: b

In which of the given single-phase motor, the rotor has no teeth or winding?

Shaded pole motor
Capacitor start motor
A permanent capacitor run the motor
Hysteresis motor

Answer: d

1 volt can be expressed as

1 joule/weber
1 joule/ columb
1 joule/ohm
1 watt/ Joule

Answer: b

A single-phase having a rating of 11 kVA, 4400/440 V, 50 Hz, distribution transformer is to be connected as an auto-transformer to get an output voltage of 3260 V. Find its maximum kVA rating as an autotransformer.

Answer: b

The starting current of a three phase induction motor is 3 times the rated current, while the rated slip is 8 %. Find the ratio of starting toque to full load toque

5
0.75
0.72
0.80

Answer: c

The Y_bus matrix of a 200 bus interlinked system is 70 % sparse. Find the number of transmission lines in the system

8100
7200
5900
4700

Answer: c

A negative sequence really is usually used to protect

A transformer
An Alternator
A transistor
A Junction

Answer: b

A potentiometer is usually a

Digital Instrument
Deflection type instrument
Null type instrument
None of these

Answer: c

An amplifier has a gain of 30 without feedback. If 20 % of the output voltage is a feedback using its resistance negative feedback circuit, find the overall gain?

67
4.28
9.85
7.47

Answer: b

Check also: List of Cadet Colleges

Top Preparation Resources for Army Navy PAF and Cadet Colleges

If you want to prepare for Army, Navy, and PAF initial tests online, check the following resources for complete preparation of Pakistan Military forces exams. Access all past papers and PDFs for free, including specialized Army Test Preparation, Navy Test Preparation, and PAF Test Preparation materials.