Explore topic-wise MCQs in Electrical Engineering.

This section includes 147 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

One coulomb of charge is equal to the charge of

A. 1.095 x 10 –19 electrons
B. 1.625 x 10–31 electrons
C. 6.242 x 1018 electrons
D. 6.025 x 10–19 electrons
Answer» D. 6.025 x 10–19 electrons
2.

Specific resistance of a material is

A. Directly proportional to the both area of cross section and length of material
B. Directly proportional to the area of cross section and inversely proportional to the length of material
C. Inversely proportional to the area of cross section and directly proportional to the length of material
D. Inversely proportional to the both area of cross section and length of material
Answer» C. Inversely proportional to the area of cross section and directly proportional to the length of material
3.

In half wave rectifiers, diode conducts during

A. Only positive half cycle
B. Only negative half cycle
C. Both positive and negative half cycle
D. Neither in positive half cycle nor in negative half cycle
Answer» B. Only negative half cycle
4.

Reciprocal of resistance is called

A. Resistivity
B. Conductance
C. Resonance
D. None of the above
Answer» C. Resonance
5.

Resistance of a wire is directly proportional to its

A. Length
B. Diameter
C. Area of cross section
D. All of the above
Answer» B. Diameter
6.

Any charged conductor, which receives electricity from the earth, when connected to it, is said to be

A. Zero potential
B. –ve potential
C. +ve potential
D. None of the above
Answer» C. +ve potential
7.

The ____ is responsible for the current to flow in a closed circuit.

A. Electric charge
B. Potential difference
C. Resistance
D. All of the above
Answer» C. Resistance
8.

One columb is approximately equal to

A. 624 x 10^12
B. 624 x 10^14
C. 624 x 10^16
D. 624 x 10^18
Answer» D. 624 x 10^18
9.

The SI unit for measurement of electric charge is

A. volt
B. columb
C. ohm
D. farad
Answer» C. ohm
10.

-A body contains electrons more than its normal number has

A. +ve charge
B. –ve charge
C. No charge
D. None of the above
Answer» C. No charge
11.

The mechanical losses are about _____ % of full load losses

A. 0 to 10
B. 10 to 20
C. 20 to 30
D. 30 to 40
Answer» C. 20 to 30
12.

Iron or magnetic losses are also called

A. Core losses
B. Field losses
C. Copper losses
D. Armature losses
Answer» B. Field losses
13.

Shaft torque equals to

A. Net torque
B. Friction torque
C. Net torque + Friction torque + Torque lost
D. Net torque – (Friction torque + Torque lost)
Answer» E.
14.

To produce dynamically induced emf, the following is (are) necessary

A. A magnetic field
B. A conductor
C. Motion of conductor with respect to the field
D. All of the above
Answer» E.
15.

A motor converts

A. Mechanical energy into electrical energy
B. Chemical energy into electrical energy
C. Electrical energy into Mechanical energy
D. Electrical energy into chemical energy
Answer» D. Electrical energy into chemical energy
16.

Which of the following generators have two field windings?

A. Series wound generator
B. Shunt wound generator
C. Compound wound generator
D. All of the above
Answer» D. All of the above
17.

-The following is (are) keyed to the shaft

A. Armature core
B. Commutator
C. Cooling fan
D. All of the above
Answer» E.
18.

For larger machines

A. Ball bearings are used at both driving and non driving ends.
B. Ball bearings are used at driving end and roller bearings are used at non driving end.
C. Roller bearings are used at driving end and ball bearings are used at non driving end
D. Roller bearings are used at both driving and non driving ends.
Answer» D. Roller bearings are used at both driving and non driving ends.
19.

The brushes are ____ in shape.

A. Triangular
B. Rectangular
C. Cylindrical
D. Square
Answer» C. Cylindrical
20.

Function of _____ is to collect current from the commutator and supply it to the external load.

A. Field magnet
B. Armature
C. Brushes
D. Yoke
Answer» D. Yoke
21.

The following is (are) the part(s) of a field magnet.

A. Yoke
B. Pole cores
C. Pole shoes
D. All of the above
Answer» E.
22.

The special device which converts AC into DC and vice versa is known as

A. Armature
B. Slip rings
C. Split rings
D. Field magnets
Answer» D. Field magnets
23.

The following magnet is used in large machines to create magnetic flux

A. Permanent magnet
B. Electro magnet
C. Temporary magnet
D. Any of the above
Answer» C. Temporary magnet
24.

-In a DMA write operation the data is transferred

A. From I/O to memory.
B. From memory to I/O.
C. from memory to memory
D. from I/O to I/O
Answer» B. From memory to I/O.
25.

The decimal value for the BCD coded number 000100l0 is

A. 6
B. 10
C. 12
D. 18
Answer» D. 18
26.

A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder?

A. 2K
B. 4K
C. l6K
D. 64K
Answer» D. 64K
27.

Input impedance of MOSSFET is

A. less than of FET but more than BJT
B. More than that of FET and BJT
C. more than that of FET but less than BJT
D. less than that of FET and BJT
Answer» C. more than that of FET but less than BJT
28.

Compared to bipolar transistor, a JFET has

A. Lower input impedance
B. Higher voltage gain –
C. Higher input impedance and high voltage gain
D. Higher input impedance and low voltage gain
Answer» E.
29.

The fastest switching logic family is

A. CMOS
B. TTL
C. DTL
D. ECL
Answer» E.
30.

-In a sample and hold circuit the following statement is false:

A. Sample time is much smaller than hold time.
B. Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes.
C. Acquisition time is the tin-re it takes for the capacitor to charge from one voltage to another voltage
D. The voltage across the hold capacitor changes by 50% during hold time
Answer» B. Aperture time is the delay between the time that the pulse is applied to the switch and the actual time the switch closes.
31.

How many comparators would a 12-bit flash ADC require?

A. 4095
B. 3095
C. 4000
D. 2512
Answer» B. 3095
32.

A 32 to 1 multiplexer has the following features.

A. 32 inputs, one output and 5 control signals
B. 32 outputs, one input and 5 control signals
C. 5 inputs, one control signal and 32 outputs
D. 5 inputs 32 control signals and one output
Answer» B. 32 outputs, one input and 5 control signals
33.

The property due to which the resistance of some metal or compound vanishes under certain conditions is known as

A. Semi conductivity.
B. Magnetostriction.
C. Curie point.
D. Super conductivity.
Answer» E.
34.

Hall effect may be used for which of the following

A. Determining whether the semiconductor is p or n type
B. Determining the carrier concentration
C. Calculating the mobility
D. Al of the above
Answer» E.
35.

Gold and silver are

A. Dielectric materials
B. Low resistivity conducting materials
C. Magnetic materials
D. Insulating materials
Answer» C. Magnetic materials
36.

Which of the following is a low-gain antenna?

A. Dish antenna on a space craft
B. Wi-Fi antenna
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
37.

Maxwell’s equations involve ________.

A. Charge density
B. Current density
C. Magnetic intensity
D. All of these
Answer» E.
38.

The control system design specification for a chemical process is described as short settling time, improved damping and zero steady state error. What control do we choose?

A. P
B. PI
C. ID
D. PID
Answer» E.
39.

Addition of zeros in transfer function causes which of the following?

A. Lead-compensation
B. Lag-compensation
C. Lead-lag compensation
D. None of the above
Answer» C. Lead-lag compensation
40.

Which of the following is the best method for determining the stability and transient response?

A. Root locus
B. Bode Plo
C. Nyquist plot
D. None of the above
Answer» B. Bode Plo
41.

A good control system has all the following features except

A. Good stability
B. Slow response
C. Good accuracy
D. Sufficient power handling capacity
Answer» C. Good accuracy
42.

The steady-state error of a feedback control system with an acceleration input becomes finite in a

A. Type 0 system.
B. Type I system
C. Type 2 system
D. Type 3 system.
Answer» D. Type 3 system.
43.

A chopper can be used on

A. Pulse width modulation only
B. Frequency modulation only
C. Amplitude modulation only
D. both (A) and (C)
Answer» E.
44.

If the capacitor of a single phase motor is short circuited

A. The motor will not start
B. The motor will run
C. The motor will run in reverse direction
D. The motor will run in the same direction at reduced RPM
Answer» B. The motor will run
45.

The generation of harmonics in transformer is mainly due to

A. Fluctuating load
B. Poor insulation
C. Mechanical vibrations
D. Saturation of core
Answer» E.
46.

The number of bits needed to address 4kb memory is

A. 6
B. 8
C. 12
D. 16
Answer» D. 16
47.

Which of the following is the most stable oscillator?

A. Wein’s bridge oscillator
B. Hartley’s oscillator
C. Colpitt’s oscillator
D. Crystal oscillator
Answer» E.
48.

Common Mode Rejection ratio (CMRR) for a differential amplifier is the ratio of

A. Differential gain / Common mode gain
B. Differential gain / Integrated gain
C. Integrated gain / Differential gain
D. Common mode gain / Differential gain
Answer» B. Differential gain / Integrated gain
49.

Which family of logic circuits used FETs?

A. TTL
B. CMOS
C. Both TTL and CMOS
D. None of the above
Answer» C. Both TTL and CMOS
50.

The following amplifier configuration yields the largest power gain of all transistor amplifier configurations.

A. Common base
B. Common emitter
C. Common collector
D. Emitter base
Answer» C. Common collector