Explore topic-wise MCQs in Electrical Engineering.

This section includes 130 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

101.

*/*_In a bipolar transistor, the emitter base junction has?

A. Forward bias
B. Reverse bias
C. Zero bias
D. Zero or reverse bias
Answer» B. Reverse bias
Discussion
102.

*/*_As compared to bipolar junction transistor, a FET?

A. Is less noisy
B. Has better thermal stability
C. Has higher input resistance
D. All of the above
Answer» E.
Discussion
103.

*/*_Piezoelectric quartz crystal resonators find application where?

A. Signal amplification is required
B. Rectification of the signal is required
C. Signal frequency control is required
D. Modulation of signal is required
Answer» C. Signal frequency control is required
Discussion
104.

*/*_Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is?

A. Normal to both current and magnetic field
B. In the direction of current
C. Antiparallel to magnetic field
D. In arbitrary direction
Answer» B. In the direction of current
Discussion
105.

*/*_An electron in the conduction band?

A. Has higher energy than the electron in the valence band
B. Has lower energy than the electron in the valence band
C. Loses its charge easily
D. Jumps to the top of the crystal
Answer» B. Has lower energy than the electron in the valence band
Discussion
106.

_ The dynamic resistance of a forward biased p-n diode$?

A. Varies inversely with current
B. Varies directly with current
C. Is constant
D. Is either constant or varies directly with current
Answer» B. Varies directly with current
Discussion
107.

_ Which of the following has highest resistivity?$?

A. Mica
B. Paraffin wax
C. Air
D. Mineral oil
Answer» D. Mineral oil
Discussion
108.

_ Light dependent resistors are$?

A. Highly doped semiconductor
B. Intrinsic semiconductor
C. Lightly doped semiconductor
D. Either A or B
Answer» D. Either A or B
Discussion
109.

_ In a semiconductor diode, the barrier offers opposition to$?

A. Holes in P-region only
B. Free electrons in N-region only
C. Majority carriers in both regions
D. Majority as well as minority carriers in both regions
Answer» D. Majority as well as minority carriers in both regions
Discussion
110.

_ Which of the following could be the maximum current rating of junction diode by 126?$?

A. 1 A
B. 10 A
C. 20 A
D. 100 A
Answer» B. 10 A
Discussion
111.

_ In which of these is reverse recovery time nearly zero?$?

A. Zener diode
B. Tunnel diode
C. Schottky diode
D. PIN diode
Answer» D. PIN diode
Discussion
112.

_ For a P-N diode, the number of minority carriers crossing the junction depends on$?

A. Forward bias voltage
B. Potential barrier
C. Rate of thermal generation of electron hole pairs
D. None of the above
Answer» D. None of the above
Discussion
113.

_In an ideal diode there is no breakdown, no __________ current, and no forward __________ drop.$?

A. Reverse, voltage
B. Forward, current
C. Forward, voltage
D. Reverse, current
Answer» B. Forward, current
Discussion
114.

_If too large current passes through the diode$?

A. All electrons will leave
B. All holes will freeze
C. Excessive heat may damage the diode
D. Diode will emit light
Answer» D. Diode will emit light
Discussion
115.

_How many free electrons does a p type semiconductor has?$?

A. Only those produced by thermal energy
B. Only those produced by doping
C. Those produced by doping as well as thermal energy
D. Any of the above
Answer» B. Only those produced by doping
Discussion
116.

_Assertion (A): A VMOS can handle much larger current than other field effect transistors.Reason (R): In a VMOS the conducting channel is very narrow.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» D. A is false but R is true
Discussion
117.

_Which one of the following is not a characteristic of a ferroelectric material?$?

A. High dielectric constant
B. No hysteresis
C. Ferroelectric characteristic only above the curie point
D. Electric dipole moment
Answer» D. Electric dipole moment
Discussion
118.

Assertion (A): A JFET can be used as a current source.Reason (R): In beyond pinch off region the current in JFET is nearly constant.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» B. Both A and R are true but R is not a correct explanation of A
Discussion
119.

A thermistor is a$?

A. Thermocouple
B. Thermometer
C. Miniature resistance
D. Heat sensitive explosive
Answer» D. Heat sensitive explosive
Discussion
120.

Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.$?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
121.

An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased$?

A. The number of free electrons increases
B. The number of free electrons increases but the number of holes decreases
C. The number of free electrons and holes increase by the same amount
D. The number of free electrons and holes increase but not by the same amount
Answer» D. The number of free electrons and holes increase but not by the same amount
Discussion
122.

The sensitivity of human eyes is maximum at$?

A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
Answer» C. Red portion of spectrum
Discussion
123.

Forbidden energy gap in germanium at 0 K is about$?

A. 10 eV
B. 5 eV
C. 2 eV
D. 0.78 eV
Answer» E.
Discussion
124.

Permalloy is$?

A. A variety of stainless steel
B. A polymer
C. A conon-ferrous alloy used in aircraft industry
D. A nickel an iron alloy having high permeability
Answer» E.
Discussion
125.

A thermistor is a?

A. Thermocouple
B. Thermometer
C. Miniature resistance
D. Heat sensitive explosive
Answer» D. Heat sensitive explosive
Discussion
126.

An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased?

A. The number of free electrons increases
B. The number of free electrons increases but the number of holes decreases
C. The number of free electrons and holes increase by the same amount
D. The number of free electrons and holes increase but not by the same amount
Answer» D. The number of free electrons and holes increase but not by the same amount
Discussion
127.

Assertion (A): In p-n-p transistor collector current is termed negative.Reason (R): In p-n-p transistor holes are majority carriers.?

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer» C. A is true but R is false
Discussion
128.

Forbidden energy gap in germanium at 0 K is about?

A. 10 eV
B. 5 eV
C. 2 eV
D. 0.78 eV
Answer» E.
Discussion
129.

The sensitivity of human eyes is maximum at?

A. White portion of spectrum
B. Green portion of spectrum
C. Red portion of spectrum
D. Violet portion of spectrum
Answer» C. Red portion of spectrum
Discussion
130.

Permalloy is?

A. A variety of stainless steel
B. A polymer
C. A conon-ferrous alloy used in aircraft industry
D. A nickel an iron alloy having high permeability
Answer» E.
Discussion