Control Systems MCQ Questions & Answers

81

Two identical first order systems have been cascaded non-interactively, the unit step response of system is:

A) over damped B) under damped C) undamped D) critically damped

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

82

Match List-I with List-II and select the correct answer, using the options given below the lists:

List-I	List-II
a. Lag compensation	1. Exterior of unit Circle
b. Lead compensation	2. PD Control
c. Stability	3. Non-minimum phase
d. Instability	4. Left half of s-plane
	5. PI control

A) a-2, b-5, c-1, d-3 B) a-3, b-1, c-2, d-5 C) a-1, b-2, c-3, d-4 D) a-5, b-2, c-4, d-1

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

83

If a zero is added in a forward path of a second order system:

A) rise time will decrease B) rise time will increase C) bandwidth will decrease D) system will be less stable

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

84

The phase margin of a system with the open-loop transfer function $$G\left( s \right)H\left( s \right) = \frac{{\left( {1 - s} \right)}}{{\left( {1 + s} \right)\left( {2 + s} \right)}}$$

A) $${0^ \circ }$$ B) $${63.4^ \circ }$$ C) $${90^ \circ }$$ D) $$\infty $$

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

85

The signal flow graph of a closed-loop system is shown in the figure, where TD represents the disturbance in the forward path: The effect of the disturbance can be reduced by:
Control Systems mcq question image

A) Increasing G₂(s) B) Decreasing G₂(s) C) Increasing G₁(s) D) Decreasing G₁(s)

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

86

A unity feedback system has a forward path transfer function equal to $$\frac{{42.25}}{{s\left( {s + 6.5} \right)}}.$$ The unit step response of this system starting from rest, will have its maximum value at time equal to:

A) 0 sec B) 0.56 sec C) 5.6 sec D) infinity

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

87

A second-order system has a transfer function given by $$G\left( s \right) = \frac{{25}}{{{s^2} + 8s + 25}}.$$ If the system, initially at rest, is subjected to a unit step input at t = 0. the second peak in the response will occur at

A) $$\pi {\text{ sec}}$$ B) $$\frac{\pi }{3}{\text{sec}}$$ C) $$\frac{{2\pi }}{3}{\text{sec}}$$ D) $$\frac{\pi }{2}{\text{sec}}$$

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

88

Given the state variable model {A, B, C} of a single-input, single-output system, the asymptotic stability is determined from:

A) A, B and C matrices B) Non-singular A C) All A D) None of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

89

The transfer function \[\frac{{Y\left( s \right)}}{{U\left( s \right)}}\] of a system described by the state equations \[\mathop {\rm{x}}\limits^ \cdot \](t) = -2x(t) + 2u(t) and y(t) = 0.5x(t) is

A) \[\frac{{0.5}}{{s - 2}}\] B) \[\frac{1}{{s - 2}}\] C) \[\frac{{0.5}}{{s + 2}}\] D) \[\frac{1}{{s + 2}}\]

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

90

Consider the system \[\frac{{dx}}{{dt}} = Ax + Bu\] with \[A = \left[ {\begin{array}{*{20}{c}} 1&0\\ 0&1 \end{array}} \right]\] and \[B = \left[ \begin{array}{l} p\\ q \end{array} \right]\] where p and q are arbitrary real numbers. Which of the following statements about the controllability of the system is true?

A) The system is completely state controllable for any nonzero values of p and q B) Only p = 0 and q = 0 result in controllability C) The system is uncontrollable for all values of p and q D) We cannot conclude about controllability from the given data

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

Control Systems MCQ Questions & Answers | ECE