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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Time Response Of Second Order Systems - 3 - Electrical Engineering (EE) MCQ

Test: Time Response Of Second Order Systems - 3 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Time Response Of Second Order Systems - 3

Test: Time Response Of Second Order Systems - 3 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Time Response Of Second Order Systems - 3 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Time Response Of Second Order Systems - 3 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Time Response Of Second Order Systems - 3 below.
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Test: Time Response Of Second Order Systems - 3 - Question 1
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What will be the nature of time response if the roots of the characteristic equation are located on the s-plane imaginary axis?

Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 1

Answer: c
Explanation: complex conjugate (non-multiple): oscillatory (sustained oscillations)
Complex conjugate (multiple): unstable (growing oscillations).

Test: Time Response Of Second Order Systems - 3 - Question 2
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Consider a system with transfer function G(s) = s+6/Ks2+s+6. Its damping ratio will be 0.5 when the values of k is: 

Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 2

Answer: c
Explanation: s+6/K[s2+s/K+6/K] Comparing with s2+2Gw+w2
w= √6/K
2Gw=1/K
2*0.5*√6/K =1/K
K=1/6.

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Test: Time Response Of Second Order Systems - 3 - Question 3
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The output in response to a unit step input for a particular continuous control system is c(t)= 1-e-t. What is the delay time Td? 

Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 3

Answer: c
Explanation: The output is given as a function of time. The final value of the output is limn->∞c(t)=1; . Hence Td (at 50% of the final value) is the solution of 0.5=1-e-Td, and is equal to ln 2 or 0.693 sec.

Test: Time Response Of Second Order Systems - 3 - Question 4
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Which one of the following is the most likely reason for large overshoot in a control system?
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 4

Answer: c
Explanation: Large overshoot refers to the maximum peak in the response of the closed loop system and this is mainly due to the high positive correcting torque.

Test: Time Response Of Second Order Systems - 3 - Question 5
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For the system 2/s+1, the approximate time taken for a step response to reach 98% of its final value is: 
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 5

Answer: c
Explanation: C(s)/R(s) = 2/s+1
R(s) = 1/s (step input)
C(s) = 2/s(s+1)
c(t) = 2[1-e-t] 1.96 = 2[1-e-T] T= 4sec.

Test: Time Response Of Second Order Systems - 3 - Question 6
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The unit step response of a second order system is = 1-e-5t-5te-5t . Consider the following statements:
1. The under damped natural frequency is 5 rad/s.
2. The damping ratio is 1.
3. The impulse response is 25te-5t.
Which of the statements given above are correct?
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 6

Answer: d
Explanation: C(s) = 1/s-1/s+5-5/(s+5)^2
C(s) = 25/s(s2+10s+25)
R(s) = 1/s
G(s) = 25/(s2+10s+25 )
w= √25
w = 5 rad/sec
G = 1.

Test: Time Response Of Second Order Systems - 3 - Question 7
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The loop transfer function of controller Gc(s) is :
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 7

Answer: a
Explanation: The transfer function of the controller is 0.1s+1/s
Gc(s) = 0.1s+1/s.

Test: Time Response Of Second Order Systems - 3 - Question 8
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The peak percentage overshoot of the closed loop system is :
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 8

Answer: c
Explanation: C(s)/R(s) = 1/s2+s+1
C(s)/R(s) = w/ws2+2Gws+w2
Compare both the equations,
w = 1 rad/sec
2Gw = 1
Mp = 16.3 %

Test: Time Response Of Second Order Systems - 3 - Question 9
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Consider a second order all-pole transfer function model, if the desired settling time(5%) is 0.60 sec and the desired damping ratio 0.707, where should the poles be located in s-plane?
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 9

Answer: b
Explanation: G = 1/√2
Gw = 5
s = -5+j5.

Test: Time Response Of Second Order Systems - 3 - Question 10
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Which of the following quantities give a measure of the transient characteristics of a control system, when subjected to unit step excitation.
1. Maximum overshoot
2. Maximum undershoot
3. Overall gain
4. Delay time
5. Rise time
6. Fall time
Detailed Solution for Test: Time Response Of Second Order Systems - 3 - Question 10

Answer: d
Explanation: Maximum overshoot, rise time and delay time are the major factor of the transient behaviour of the system and determines the transient characteristics.

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