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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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1801Electrical EngineeringMedium

A change in the value of the emitter resistance Re in a differential amplifier?

Adoes not effect either Ad and Ac

Baffects the common mode gain Ac

Caffects the difference mode gain Ad

Daffects both Ad and Ac

Correct answer

B. affects the common mode gain Ac

Explanation

The correct answer is affects the common mode gain Ac.

1802Electrical EngineeringMedium

In thermal-electrical analogy charge is considered analogous to________?

Atemperature

Breciprocal of temperature

Cnone of the above

Dheat flow

Ereciprocal of heat flow

Correct answer

A. temperature

Explanation

The correct answer is temperature.

1803Electrical EngineeringMedium

An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit’s critical frequency is________?

A633 kHz

B331 kHz

C60 kHz

D333 kHz

Correct answer

A. 633 kHz

Explanation

The correct answer is 633 kHz.

1804Electrical EngineeringMedium

The pressure coil of a wattmeter should be connected on the supply side of the current coil when________?

Asupply voltage is low

Bload impedance is high

Cnone of the above

Dload impedance is low

Correct answer

B. load impedance is high

Explanation

The correct answer is load impedance is high.

1805Electrical EngineeringMedium

The square waveform of current has following relation between r.m.s. value and average value?

Anone of the above

Br.m.s. value of current is less than average value

Cr.m.s. value is equal to average value

Dr.m.s. value of current is greater than average value

Correct answer

C. r.m.s. value is equal to average value

Explanation

The correct answer is r.m.s. value is equal to average value.

1806Electrical EngineeringMedium

A forward biased pn junction diode has a resistance of the order of________?

AkO

BNone of the above

DMO

Correct answer

C. O

Explanation

The correct answer is O.

1807Electrical EngineeringMedium

A closed loop system is distinguished from open loop system by which of the following?

AInput pattern

BOutput pattern

CFeedback

DServomechanism

Correct answer

C. Feedback

Explanation

The correct answer is Feedback.

1808Electrical EngineeringMedium

In an automatic control system which of the following elements is not used?

AError detector

BOscillator

CSensor

DFinal control element

Correct answer

B. Oscillator

Explanation

The correct answer is Oscillator.

1809Electrical EngineeringMedium

In which of the following base systems is 123 not a valid number?

ABase 3

BBase8

CBase 16

DBase 10

Correct answer

A. Base 3

Explanation

The correct answer is Base 3.

1810Electrical EngineeringMedium

The efficiency of an induction motor can be expected to be nearly________?

A60 to 90%

B80 to 90%

C99%

D95 to 98%

Correct answer

B. 80 to 90%

Explanation

The correct answer is 80 to 90%.

1801Electrical EngineeringMedium

A change in the value of the emitter resistance Re in a differential amplifier?

Adoes not effect either Ad and Ac

Baffects the common mode gain Ac

Caffects the difference mode gain Ad

Daffects both Ad and Ac

Correct answer

B. affects the common mode gain Ac

Explanation

The correct answer is affects the common mode gain Ac.

1802Electrical EngineeringMedium

In thermal-electrical analogy charge is considered analogous to________?

Atemperature

Breciprocal of temperature

Cnone of the above

Dheat flow

Ereciprocal of heat flow

Correct answer

A. temperature

Explanation

The correct answer is temperature.

1803Electrical EngineeringMedium

An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit’s critical frequency is________?

A633 kHz

B331 kHz

C60 kHz

D333 kHz

Correct answer

A. 633 kHz

Explanation

The correct answer is 633 kHz.

1804Electrical EngineeringMedium

The pressure coil of a wattmeter should be connected on the supply side of the current coil when________?

Asupply voltage is low

Bload impedance is high

Cnone of the above

Dload impedance is low

Correct answer

B. load impedance is high

Explanation

The correct answer is load impedance is high.

1805Electrical EngineeringMedium

The square waveform of current has following relation between r.m.s. value and average value?

Anone of the above

Br.m.s. value of current is less than average value

Cr.m.s. value is equal to average value

Dr.m.s. value of current is greater than average value

Correct answer

C. r.m.s. value is equal to average value

Explanation

The correct answer is r.m.s. value is equal to average value.

1806Electrical EngineeringMedium

A forward biased pn junction diode has a resistance of the order of________?

AkO

BNone of the above

DMO

Correct answer

C. O

Explanation

The correct answer is O.

1807Electrical EngineeringMedium

A closed loop system is distinguished from open loop system by which of the following?

AInput pattern

BOutput pattern

CFeedback

DServomechanism

Correct answer

C. Feedback

Explanation

The correct answer is Feedback.

1808Electrical EngineeringMedium

In an automatic control system which of the following elements is not used?

AError detector

BOscillator

CSensor

DFinal control element

Correct answer

B. Oscillator

Explanation

The correct answer is Oscillator.

1809Electrical EngineeringMedium

In which of the following base systems is 123 not a valid number?

ABase 3

BBase8

CBase 16

DBase 10

Correct answer

A. Base 3

Explanation

The correct answer is Base 3.

1810Electrical EngineeringMedium

The efficiency of an induction motor can be expected to be nearly________?

A60 to 90%

B80 to 90%

C99%

D95 to 98%

Correct answer

B. 80 to 90%

Explanation

The correct answer is 80 to 90%.