Explore topic-wise InterviewSolutions in .

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

51.

Inductor does not allow sudden changes in?(a) Voltage(b) Current(c) Resistance(d) InductanceThe question was asked in a job interview.Asked question is from Mechanical Analogy, Current and Voltage in an Inductive Circuit topic in division Single Phase Series Circuits of Basic Electrical Engineering

Answer» RIGHT answer is (B) CURRENT

The explanation: The inductor does not allow sudden CHANGES in current because if current changes in the inductor occur in zero time, the voltage becomes zero which is not possible.
Discussion
52.

The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is?(a) i = Vm(sint)/XL(b) i = Vm(cost)/XL(c) i = -Vm(sint)/XL(d) i = -Vm(cost)/XLThis question was addressed to me during an interview.My question is from Alternating Current in a Resistive & Inductive Circuit topic in portion Single Phase Series Circuits of Basic Electrical Engineering

Answer» RIGHT answer is (d) i = -VM(COST)/XL

Explanation: V=Vm*sint

I=V/XL = -Vm(cost)/XL(since current lags VOLTAGE by 900 in inductive circuit).
Discussion
53.

The power for a purely resistive circuit is zero when?(a) Current is zero(b) Voltage is zero(c) Both current and voltage are zero(d) Either current or voltage is zeroI have been asked this question during an online interview.I'd like to ask this question from Alternating Current in a Resistive & Inductive Circuit topic in chapter Single Phase Series Circuits of Basic Electrical Engineering

Answer»

The correct OPTION is (d) EITHER current or voltage is zero

To EXPLAIN: P=VIcosϕPower in a circuit is the PRODUCT of voltage, current and the cosine of the phase ANGLE. Phase angle is 00 for purely resistive circuit so, P=VI. Hence if either voltage or current is zero, the power is zero.
Discussion
54.

Find the value of the instantaneous voltage if the resistance is 2 ohm and the instantaneous current in the circuit is 5A.(a) 5V(b) 2V(c) 10V(d) 2.5VI had been asked this question in unit test.My query is from Alternating Current in a Resistive & Inductive Circuit in section Single Phase Series Circuits of Basic Electrical Engineering

Answer»

The CORRECT choice is (C) 10V

Explanation: We know that,

v=iR, SUBSTITUTING the given VALUES from the question, we get v=10V.
Discussion
55.

Calculate the resistance in the circuit if the rms voltage is 20V and the rms current is 2A.(a) 2 ohm(b) 5 ohm(c) 10 ohm(d) 20 ohmThis question was addressed to me in an international level competition.My question comes from Alternating Current in a Resistive & Inductive Circuit in portion Single Phase Series Circuits of Basic Electrical Engineering

Answer»

Correct OPTION is (C) 10 ohm

To explain I would SAY: We KNOW that:

R=V/I

Substituting the given values from the question, we get R=10 ohm.
Discussion