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.

101.

What is the relation between the flux and the magnetizing current when a ferromagnetic core is introduced within the inductor?(a) Directly proportional(b) Inversely proportional(c) Not proportional(d) Current is double of fluxI got this question by my college director while I was bunking the class.The question is from Ferromagnetic Cored Inductor in a DC Circuit in chapter Inductance in a DC Circuit of Basic Electrical Engineering

Answer»

Right option is (C) Not proportional

Easiest explanation: When a ferromagnetic core is introduced within an INDUCTOR the flux changes rapidly, WHEREAS the current changes at the same PACE. Hence the TWO are not proportional.
Discussion
102.

If the current changes from 20A to 10A in 5 seconds and the value of inductance is 1H, calculate the emf induced.(a) 8V(b) 6V(c) 4V(d) 2VI got this question in an interview for job.My question comes from Factors Determining the Inductance of a Coil in section Inductance in a DC Circuit of Basic Electrical Engineering

Answer»

The correct CHOICE is (d) 2V

To EXPLAIN: We know that:

emf=L(i2-i1)/t

Substituting the VALUES from the QUESTION we get emf=2V.
Discussion
103.

The types of inductors are ____________(a) Fixed and variable(b) Only fixed(c) Only variable(d) Neither fixed nor variableI got this question in an interview for job.My doubt is from Mutual Inductance in section Inductance in a DC Circuit of Basic Electrical Engineering

Answer»

Right answer is (a) FIXED and variable

The explanation: The TWO TYPES of inductors are fixed and variable inductors. Fixed inductors are those whose INDUCTANCE value cannot be changed. Variable inductors are those whose VALUES can be changed as and when required.
Discussion
104.

The flux linkage in coil 1 is 3 Wb and it has 500 turns and the current in coil 2 is xA, calculate the value of x if the mutual inductance is 750H.(a) 1A(b) 2A(c) 3A(d) 4AThe question was asked during an online interview.The above asked question is from Mutual Inductance in division Inductance in a DC Circuit of Basic Electrical Engineering

Answer»

The correct option is (B) 2A

The BEST EXPLANATION: We know that mutual inductance is the PRODUCT of the number of TURNS in one coil and the flux linkages of that coil, divided by the current in the other coil.

I=3*500/750 = 2A.
Discussion
105.

What is the total applied voltage in an inductive circuit?(a) V=Ri+Ldi/dt(b) V=Ri+di/dt(c) V=i+Ldi/dt(d) V=R+Ldi/dtI have been asked this question by my school teacher while I was bunking the class.My query is from Analysis of Growth & Decay in chapter Inductance in a DC Circuit of Basic Electrical Engineering

Answer»

Right option is (a) V=Ri+Ldi/dt

To explain: The total VOLTAGE in an inductive CIRCUIT is the sum of the voltage due to the RESISTOR which is Ri and the voltage due to the INDUCTOR which is Ldi/dt. Hence V=Ri+Ldi/dt.
Discussion