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Network Theorems

Study 47 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

In a series parallel circuit, any two resistances in the same current path must be in________?

Aparallel with the voltage source

Bseries with the voltage source

Cparallel with each other

Dseries with each other

Correct answer

D. series with each other

Explanation

The correct answer is series with each other.

32Electrical EngineeringMedium

An ideal voltage source has________?

Aterminal voltage in proportion to load

Bopen circuit voltage equal to the voltage on full load

Cterminal voltage in proportion to current

Dzero internal resistance

Correct answer

D. zero internal resistance

Explanation

The correct answer is zero internal resistance.

33Electrical EngineeringMedium

To determine the polarity of the voltage drop across a resistor, it is necessary to know________?

Avalue of resistor

Be.m.fs. in the circuit

Cvalue of current through the resistor

Ddirection of current through the resistor

Correct answer

D. direction of current through the resistor

Explanation

The correct answer is direction of current through the resistor.

34Electrical EngineeringMedium

Choose the incorrect statement: A branch formed by the parallel connection………

AA branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

BA branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

CA branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

DA branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

Correct answer

D. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

Explanation

The correct answer is A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit..

35Electrical EngineeringMedium

Which of the following is the passive element?

AIdeal current source

BAll of the above

CIdeal voltage source

DCapacitance

Correct answer

D. Capacitance

Explanation

The correct answer is Capacitance.

36Electrical EngineeringMedium

A star circuit has element of resistance R/2. The equivalent delta elements will be________?

A2R

B4R

Cfi?

DR/6

Correct answer

C. fi?

Explanation

The correct answer is fi?.

37Electrical EngineeringMedium

Thevenin resistance Rth is found

Abetween any two ‘open’ terminals

Bbetween same open terminals as for Etk

Cby short-circuiting the given two terminals

Dby removing voltage sources along with their internal resistances

Correct answer

B. between same open terminals as for Etk

Explanation

The correct answer is between same open terminals as for Etk.

38Electrical EngineeringMedium

The number of independent equations to solve a network is equal to________?

Athe number of branches

Bthe number of chords

Csum of the number of branches and chords

Dsum of number of branches, chords and nodes

Correct answer

B. the number of chords

Explanation

The correct answer is the number of chords.

39Electrical EngineeringMedium

Kirchhoff s law is applicable to________?

Apassive networks only

Ba.c. circuits only

Cboth a.c. as well d.c. circuits

Dd.c. circuits only

Correct answer

C. both a.c. as well d.c. circuits

Explanation

The correct answer is both a.c. as well d.c. circuits.

40Electrical EngineeringMedium

In Thevenin’s theorem, to find Z

Aall independent voltage sources are short circuited and all independent current sources are open circuited

Ball independent current sources are short circuited and independent voltage sources are open circuited

Call independent voltage sources are open circuited and all independent current sources are short circuited

Dall independent voltage and current sources are short circuited

Correct answer

A. all independent voltage sources are short circuited and all independent current sources are open circuited

Explanation

The correct answer is all independent voltage sources are short circuited and all independent current sources are open circuited.

Choose the incorrect statement: A branch formed by the parallel connection………

AA branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

BA branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

CA branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

DA branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

Correct answer

D. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

Explanation

The correct answer is A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit..

Thevenin resistance Rth is found

Abetween any two ‘open’ terminals

Bbetween same open terminals as for Etk

Cby short-circuiting the given two terminals

Dby removing voltage sources along with their internal resistances

Correct answer

B. between same open terminals as for Etk

Explanation

The correct answer is between same open terminals as for Etk.

In Thevenin’s theorem, to find Z

Aall independent voltage sources are short circuited and all independent current sources are open circuited

Ball independent current sources are short circuited and independent voltage sources are open circuited

Call independent voltage sources are open circuited and all independent current sources are short circuited

Dall independent voltage and current sources are short circuited

Correct answer

A. all independent voltage sources are short circuited and all independent current sources are open circuited

Explanation

The correct answer is all independent voltage sources are short circuited and all independent current sources are open circuited.