ESE-2018 Electrical Engineering Quiz 22

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Question 1

Consider that in a system loop transfer function, addition of a pole results in the following:
1) Root locus gets pulled to the right-hand side.
2) Steady-state error is increased.
3) System responses gets slower.
Which of the above statements are correct?

• A1, 2 and 3
• B1 and 2 only
• C1 and 3 only
• D2 and 3 only

Question 2

A phase lead compensating network has its transfer function  
The maximum phase lead occurs at a frequency of __

• A50 rad/s
• B25 rad/s
• C10 rad/s
• D4 rad/s

Question 3

Match List- I(Components) with List- II (Function) and select the correct answer using the code given below the lists:
List-I
A) Servomotor
B) Amplidyne
C) Potentiometer
D) Flapper valve
List-II
1) Error detector
2) Transducer
3) Actuator
4) Power amplifier

• AA-2; B-4; C-1; D-3
• BA-3; B-1; C-4; D-2
• CA-2; B-1; C-4; D-3
• DA-3; B-4; C-1; D-2

Question 4

In a feedback control system, phase margin (PM) is
1) Directly proportional to
2) Inversely proportional to
3) Independent of
4) Zero when = 0
Which of the above statements are correct?

• A1 and 2
• B2 and 3
• C3 and 4
• D1 and 4

Question 5

For a unity feedback control system, if its open-loop transfer function is given by then its gain margin will

• A20 dB
• B40 dB
• C60 dB
• D80 dB

Question 6

What is the value of the damping ratio of a second order system when the value of the resonant peak is unity?

• A√2
• BUnity
• C1/√2
• DZero

Question 7

If a feedback control system has its open- loop transfer function

the coordinates of the centroid of the asymptotes of its root-locus are.

• A–1 and 0
• B1 and 0
• C0 and –1
• D0 and 1

Question 8

Where are the K =0 points on the root loci of the characteristic equation of the closed loop control system located at?

• AZeros of G(s) H(s)
• BPoles of G(s) H(s)
• CBoth Zeros and Poles of G(s) H(s)
• DNeither at Zeros nor at Poles of G(s) H(s)

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