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All Electrical Engineering MCQs

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

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1451Electrical EngineeringMedium

When a transistor is driven to cut off, ideally the output is ________?

AVCC/3

BVCC

DVCC/2

Correct answer

B. VCC

Explanation

The correct answer is VCC.

1452Electrical EngineeringMedium

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is________Vs

A50

B0.05

C500

D20

Correct answer

D. 20

Explanation

The correct answer is 20.

1453Electrical EngineeringMedium

The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ________?

A1000 : 1

B1 : 1

C100 : 1

D40,000 : 1

Correct answer

D. 40,000 : 1

Explanation

The correct answer is 40,000 : 1.

1454Electrical EngineeringMedium

have maximum unbalanced forces________?

ADiesel shunters

BElectric locomotives

CSteam locomotives

DDiesel locomotives

Correct answer

C. Steam locomotives

Explanation

The correct answer is Steam locomotives.

1455Electrical EngineeringMedium

Which of the following device is used to measure vacuum?

AVenturi metre

BBarometer

CHygrometer

DU-tube manometer

Correct answer

D. U-tube manometer

Explanation

The correct answer is U-tube manometer.

1456Electrical EngineeringMedium

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are________?

Afriction and windage losses

Bhysteresis and eddy current losses

Ccopper losses

Dnone of the above

Correct answer

B. hysteresis and eddy current losses

Explanation

The correct answer is hysteresis and eddy current losses.

1457Electrical EngineeringMedium

No-load current in a transformer________?

Alags behind the voltage by about 75°

Bleads the voltage by about 75°

Cleads the voltage by about 15°

Dlags behind the voltage by about 15°

Correct answer

A. lags behind the voltage by about 75°

Explanation

The correct answer is lags behind the voltage by about 75°.

1458Electrical EngineeringMedium

The Op-amp can amplify________?

Aneither d.c. nor a.c. signals

Ba.c. signals only

Cd.c. signals only

Dboth a.c. and d.c. signals

Correct answer

D. both a.c. and d.c. signals

Explanation

The correct answer is both a.c. and d.c. signals.

1459Electrical EngineeringMedium

Hot rolled sheets have ________ value of permeability?

Alow

Bnone of the above

Czero

Dhigh

Correct answer

A. low

Explanation

The correct answer is low.

1460Electrical EngineeringMedium

In Boolean algebra, the bar sign (-) indicates________?

AAND operation

BOR operation

CNOT operation

DNone of the above

Correct answer

C. NOT operation

Explanation

The correct answer is NOT operation.

1451Electrical EngineeringMedium

When a transistor is driven to cut off, ideally the output is ________?

AVCC/3

BVCC

DVCC/2

Correct answer

B. VCC

Explanation

The correct answer is VCC.

1452Electrical EngineeringMedium

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is________Vs

A50

B0.05

C500

D20

Correct answer

D. 20

Explanation

The correct answer is 20.

1453Electrical EngineeringMedium

The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ________?

A1000 : 1

B1 : 1

C100 : 1

D40,000 : 1

Correct answer

D. 40,000 : 1

Explanation

The correct answer is 40,000 : 1.

1454Electrical EngineeringMedium

have maximum unbalanced forces________?

ADiesel shunters

BElectric locomotives

CSteam locomotives

DDiesel locomotives

Correct answer

C. Steam locomotives

Explanation

The correct answer is Steam locomotives.

1455Electrical EngineeringMedium

Which of the following device is used to measure vacuum?

AVenturi metre

BBarometer

CHygrometer

DU-tube manometer

Correct answer

D. U-tube manometer

Explanation

The correct answer is U-tube manometer.

1456Electrical EngineeringMedium

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are________?

Afriction and windage losses

Bhysteresis and eddy current losses

Ccopper losses

Dnone of the above

Correct answer

B. hysteresis and eddy current losses

Explanation

The correct answer is hysteresis and eddy current losses.

1457Electrical EngineeringMedium

No-load current in a transformer________?

Alags behind the voltage by about 75°

Bleads the voltage by about 75°

Cleads the voltage by about 15°

Dlags behind the voltage by about 15°

Correct answer

A. lags behind the voltage by about 75°

Explanation

The correct answer is lags behind the voltage by about 75°.

1458Electrical EngineeringMedium

The Op-amp can amplify________?

Aneither d.c. nor a.c. signals

Ba.c. signals only

Cd.c. signals only

Dboth a.c. and d.c. signals

Correct answer

D. both a.c. and d.c. signals

Explanation

The correct answer is both a.c. and d.c. signals.

1459Electrical EngineeringMedium

Hot rolled sheets have ________ value of permeability?

Alow

Bnone of the above

Czero

Dhigh

Correct answer

A. low

Explanation

The correct answer is low.

1460Electrical EngineeringMedium

In Boolean algebra, the bar sign (-) indicates________?

AAND operation

BOR operation

CNOT operation

DNone of the above

Correct answer

C. NOT operation

Explanation

The correct answer is NOT operation.