Questions 81–90 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 9 of 72

Question 16

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Which one of the following statements is true about the small signal voltage gain of a MOSFET based single stage amplifier?
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Question 17

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Assuming ideal op-amps, the circuit represents a
Diagram for Electrical Engineering question 17

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Question 18

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The I-V characteristics of the element between the nodes X and Y is best depicted by
Diagram for Electrical Engineering question 18

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Question 19

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A nullator is defined as a circuit element where the voltage across the device and the current through the device are both zero. A series combination of a nullator and a resistor of value, R, will behave as a
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Question 20

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Consider a discrete-time linear time-invariant (LTI) system

, where


where

is the discrete-time unit impulse function. For an input signal

, the output

is
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Question 21

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Consider a continuous-time signal

where

is the continuous-time unit step function. Let

be the continuous-time unit impulse function. The value of

is
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Question 22

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Selected data points of the step response of a stable first-order linear time-invariant (LTI) system are given below. The closest value of the time-constant, in sec, of the system is
Time (sec)
0.6
1.6
2.6
10

Output
0.78
1.65
2.18
2.98
3
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Question 23

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The Nyquist plot of a strictly stable

having the numerator polynomial as

encircles the critical point

once in the anti-clockwise direction. Which one of the following statements on the closed-loop system shown in figure, is correct?
Diagram for Electrical Engineering question 23

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Question 24

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During a power failure, a domestic household uninterruptible power supply (UPS) supplies AC power to a limited number of lights and fans in various rooms. As per a Newton-Raphson load-flow formulation, the UPS would be represented as a
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Question 25

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Which one of the following figures represents the radial electric field distribution

caused by a spherical cloud of electrons with a volume charge density,

for

(both

are positive and

is the radial distance) and

for

?
Diagram for Electrical Engineering question 25

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