Network Theory And Analysis MCQ Questions & Answers

31

In the circuit shown below, the switch is closed at t = 0. What is the initial value of the current through the capacitor?
Network Theory and Analysis mcq question image

Network Theory and Analysis mcq question image

A) 0.8 A B) 1.6 A C) 2.4 A D) 3.2 A

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Answer & Solution

Answer: Option A

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32

The voltage induced in a coil by a changing flux will be of such a polarity that if a current could flow as a result of that induced voltage, the flux established by that current would oppose the causing or original flux change. It is known as

A) Faraday's law B) Lenz's law C) Biot-Savart law D) Ampere's circuital low

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Answer & Solution

Answer: Option B

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33

According to maximum power transfer theorem, maximum power transfer occurs when

A) Load R is equal to the half the R of network B) Load R is equal to twice the R of network C) Load R is equal to the R of network looking back at it from voltage terminal D) Load R is equal to the R of network looking back at it from load terminals with all sources being replaced by their respective internal resistance

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Answer & Solution

Answer: Option D

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34

A two-terminal network consists of a coil having inductance L and resistance R shunted by a capacitance C. The poles and zeros of the driving-point impedance function Z(ω) are located as poles at $$ - \frac{1}{2} \pm {\text{j}}\frac{{\sqrt 3 }}{2}$$ and zero at -1. If Z(0) = 1, the values of R, L and C are

A) 1Ω, 1H and 1µF B) 1Ω, 1H and 1F C) 1Ω, 1µH and 1F D) 1kΩ, 1H and 1F

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Answer & Solution

Answer: Option B

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35

If V = V_msinωt is the voltage across the capacitor, then the current is:

A) $${I_m}\sin \left( {\omega t + \frac{\pi }{2}} \right)$$ B) $$\frac{{{I_m}}}{{\sqrt 2 }}$$ C) $${I_m}\sin \omega t$$ D) $${I_m}\sin \left( {\omega t - \frac{\pi }{2}} \right)$$

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Answer & Solution

Answer: Option A

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36

Consider the following statements:
1. Voltage across a capacitor cannot change abruptly.
2. Voltage across an inductor cannot change abruptly.
3. Current through a capacitor cannot change abruptly.
4. Current through an inductor cannot change abruptly
Which of these statements are correct?

A) 1 and 2 only B) 2 and 3 only C) 3 and 4 only D) 1 and 4 only

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Answer & Solution

Answer: Option D

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37

Which one of the following is the transfer function of an electrical low-pass filter using R and C elements?

A) $$\frac{{RCs}}{{\left[ {1 + RCs} \right]}}$$ B) $$\frac{1}{{\left[ {1 + RCs} \right]}}$$ C) $$\frac{{RC}}{{\left[ {1 + RCs} \right]}}$$ D) $$\frac{s}{{\left[ {1 + RCs} \right]}}$$

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Answer & Solution

Answer: Option B

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38

The steady-state response of a network to the excitation Vcos(ωt + φ) may be found in three steps. The first two steps are as follows:
1. Determining the response of the network to the excitation e^jωt.
2. Multiplying the above response by $$\overline {\text{V}} $$ = Ve^jφ.
The third step is

A) finding the complex conjugate of the expression after step 2 B) finding the magnitude of the expression after step 2 C) finding the real part of the expression after step 2 D) finding the imaginary part of the expression after step 2

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Answer & Solution

Answer: Option C

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39

What is the phase angle between the capacitor current and the applied voltage in a parallel RC circuit?

A) 90° B) 0° C) 45° D) 180°

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Answer & Solution

Answer: Option A

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40

The resonance frequency for the given circuit is

A) 1 rad/s B) 2 rad/s C) 4 rad/s D) 4.5 rad/s

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Answer & Solution

Answer: Option B

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Network Theory And Analysis MCQ Questions & Answers | ECE