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Basic Electrical MCQs

Study 121 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

Bulbs in street lighting are all connected in________?

Aparallel

Bend-to-end

Cseries-parallel

Dseries

Correct answer

A. parallel

Explanation

The correct answer is parallel.

12Electrical EngineeringMedium

In the case of direct current________?

Amagnitude and direction of current remains constant

Bmagnitude of current changes with time

Cmagnitude and direction of current changes with time

Dmagnitude of current remains constant

Correct answer

A. magnitude and direction of current remains constant

Explanation

The correct answer is magnitude and direction of current remains constant.

13Electrical EngineeringMedium

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?

A48 Q

B36 Q

C18 Q

D64 Q

Correct answer

B. 36 Q

Explanation

The correct answer is 36 Q.

14Electrical EngineeringMedium

Magnetic flux has the unit of

AAmpere-turn

BWeber

CTesla

DNewton

Correct answer

B. Weber

Explanation

The unit of magnetic flux is called Weber in honor of famous scientist Wilhelm Eduard Weber (1804 – 1891). Magnetic flux has also another unit named Maxwell. 1 Maxwell = 10-8 Weber.

15Electrical EngineeringMedium

The rating of a fuse wire is always expressed in________?

Aampere-volts

Bampere-hours

Camperes

DkWh

Correct answer

C. amperes

Explanation

The correct answer is amperes.

16Electrical EngineeringMedium

When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is________?

A1 n-mho

Bnone of the above

C106 mho

D1 milli-mho

Correct answer

A. 1 n-mho

Explanation

The correct answer is 1 n-mho.

17Electrical EngineeringMedium

Temperature co-efficient of resistance is expressed in terms of________?

Amhos/°C

Bmhos/ohm°C

Cohms/°C

Dohms/ohm°C

Correct answer

D. ohms/ohm°C

Explanation

The correct answer is ohms/ohm°C.

18Electrical EngineeringMedium

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be________?

A80 ohms

B20 ohms

C10 ohms

D160 ohms

Correct answer

C. 10 ohms

Explanation

The correct answer is 10 ohms.

19Electrical EngineeringMedium

A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is________?

A600 Q

B800 Q

C1000 Q

D400 Q

Correct answer

B. 800 Q

Explanation

The correct answer is 800 Q.

20Electrical EngineeringMedium

Which of the following statement is correct________?

AA semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

BA semi-conductor is a material made of alternate layers of conducting material and insulator

CA semi-conductor is one which con¬ducts only half of the applied voltage

DA semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator

Correct answer

A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

Explanation

The correct answer is A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator.

In the case of direct current________?

Amagnitude and direction of current remains constant

Bmagnitude of current changes with time

Cmagnitude and direction of current changes with time

Dmagnitude of current remains constant

Correct answer

A. magnitude and direction of current remains constant

Explanation

The correct answer is magnitude and direction of current remains constant.

Which of the following statement is correct________?

AA semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

BA semi-conductor is a material made of alternate layers of conducting material and insulator

CA semi-conductor is one which con¬ducts only half of the applied voltage

DA semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator

Correct answer

A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

Explanation

The correct answer is A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator.