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Test: Transients in LR Networks - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Transients in LR Networks

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

An RL network is one which consists of ____________

Detailed Solution for Test: Transients in LR Networks - Question 1

An R-L network is a network which consists of a resistor which is connected in series to an inductor.

Test: Transients in LR Networks - Question 2

 At DC, inductor acts as _____________

Detailed Solution for Test: Transients in LR Networks - Question 2

At DC, the inductor acts as short circuit because the inductive resistance is zero. The frequency of a DC circuit is 0. The inductive resistance=(2*pi*f*L). Therefore, if the frequency is 0, the inductive resistance is zero and it acts as an short circuit.

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Test: Transients in LR Networks - Question 3

 In an RL series circuit, when the switch is closed and the circuit is complete, what is the response?

Detailed Solution for Test: Transients in LR Networks - Question 3

In an RL series circuit, the response decays with time because according to the equation, there is an exponential decrease in the response.

Test: Transients in LR Networks - Question 4

 If the switch is closes at t=0, what is the current in the circuit?

Detailed Solution for Test: Transients in LR Networks - Question 4

Initially, when the switch is open, the current in the circuit is 0. As soon as the switch is closes at t=0+, the inductor acts as an open circuit, hence the current in the circuit is zero.

Test: Transients in LR Networks - Question 5

 What is the voltage across the inductor at t=0?​

Detailed Solution for Test: Transients in LR Networks - Question 5

Initially, when the switch is open, the current in the circuit is 0. As soon as the switch is closes at t=0+, the inductor acts as an open circuit, hence the current in the circuit is zero. Since the current in the circuit is zero, there is no voltage drop across the resistor and the voltage across the inductor is equal to the supply voltage, which is equal to 60V.

Test: Transients in LR Networks - Question 6

What is the expression for current in the given circuit?​

Detailed Solution for Test: Transients in LR Networks - Question 6

At t = 0+ the current in the circuit is zero. Therefore at t = 0+, i = 0, 0 = c + 2, c = -2. Substituting the value of c in the current equation, we have i = 2(1-e-2t)A.

Test: Transients in LR Networks - Question 7

 At steady state, inductor acts as ____________

Detailed Solution for Test: Transients in LR Networks - Question 7

At steady state, inductor acts as a short circuit because at steady state maximum current flows across the inductor. Hence it acts as a zero resistance source or an open circuit.

Test: Transients in LR Networks - Question 8

At steady state, the current in the inductor is?

Detailed Solution for Test: Transients in LR Networks - Question 8

At steady state maximum current flows in the inductor because it acts as an open circuit.

Test: Transients in LR Networks - Question 9

Initially, when the switch in a series RL circuit is closed, the inductor acts as?

Detailed Solution for Test: Transients in LR Networks - Question 9

Initially, when the switch in a series RL circuit is closed, the inductor acts as an open circuit. This is because the current gradually increases as the time increases. At t=0, the current in the inductor is zero, hence it acts as an open circuit.

Test: Transients in LR Networks - Question 10

Initially, when the switch in a series RL circuit is closed, the current in the inductor is?

Detailed Solution for Test: Transients in LR Networks - Question 10

Initially, when the switch in a series RL circuit is closed, the inductor acts as an open circuit. Current in an open circuit is zero, hence the inductor current is zero.

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