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Test: Factors Determining The Inductance Of A Coil - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Factors Determining The Inductance Of A Coil

Test: Factors Determining The Inductance Of A Coil for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Factors Determining The Inductance Of A Coil questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Factors Determining The Inductance Of A Coil MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Factors Determining The Inductance Of A Coil below.
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Test: Factors Determining The Inductance Of A Coil - Question 1

As the number of turns in the coil increases, what happens to the inductance of the coil?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 1

Inductance is directly proportional to the square of the number of turns in the coil, hence as the number of turns increases, inductance also increases.

Test: Factors Determining The Inductance Of A Coil - Question 2

What happens to the inductance when the magnetic field strength decreases?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 2

Inductance is directly proportional to the magnetic field strength in the coil, hence as the magnetic field strength increases, inductance decreases.

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Test: Factors Determining The Inductance Of A Coil - Question 3

What happens to the inductance when the current in the coil becomes double its original value?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 3

The formula for magnetic field strength in a coil is:
H=iN/l
The inductance is: directly proportional to magnetic field strength, hence as the current value doubles, the inductance also doubles.

Test: Factors Determining The Inductance Of A Coil - Question 4

When the coil is wrapped around a ferromagnetic core, why is it difficult to determine the inductance?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 4

 When a coil is wrapped around a ferromagnetic core, it is difficult to determine the inductance because the variation of flux is no longer proportional to the variation of current.

Test: Factors Determining The Inductance Of A Coil - Question 5

 What happens to the inductance as the area of cross section of the coil increases?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 5

The formula for inductance is:
L=4*pi*10-7*A*N2/l, hence as the area of cross section A increases, the inductance also increases.

Test: Factors Determining The Inductance Of A Coil - Question 6

What happens to the inductance as the length of the magnetic circuit increases?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 6

The formula for inductance is:
L=4*pi*10-7*A*N2/l, hence as the length of the magnetic circuit l increases, the inductance decreases.

Test: Factors Determining The Inductance Of A Coil - Question 7

Among the following, which is the right formula for inductance?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 7

The average emf induced is proportional to the current per unit time, the constant of proportionality being L. Hence emf=LI/t. Making L the subject of the formula, we get: L=emf*t/I.

Test: Factors Determining The Inductance Of A Coil - Question 8

The unit for inductance is ___________

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 8

The unit of induction is named after a famous scientist Joseph Henry who independently discovered electromagnetic induction.

Test: Factors Determining The Inductance Of A Coil - Question 9

For a coil having a magnetic circuit of constant reluctance, the flux is ___________ to the current.

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 9

For a coil having a magnetic circuit of constant reluctance, the flux is directly proportional to the current.

Test: Factors Determining The Inductance Of A Coil - Question 10

What is the unit for inductive reactance?

Detailed Solution for Test: Factors Determining The Inductance Of A Coil - Question 10

Inductive reactance is nothing but the impedance. Impedance is the AC equivalent of resistance, hence the unit for inductive reactance is ohm.

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