Control Systems MCQ Questions & Answers

1

In Routh's-Hurwitz criterion, if there are changes of signs in the elements of the first column, then the number of sign changes indicates

A) The number of roots with negative real parts B) The number of roots with positive real parts C) The number of pair of roots of opposite sign D) The number of pair of roots of same sign

Discuss

Answer & Solution

Answer: Option B

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

2

While forming Routh's array, the situation of a row of zeros indicates that the system

A) Has symmetrically located roots B) Is not sensitive to variation in gain C) Is stable D) Unstable

Discuss

Answer & Solution

Answer: Option A

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

3

If the roots of the characteristic equation s² + a₁s + a₂ = 0 of a network are negative real and unequal, then the system is:

A) Oscillatory B) Critically damped C) Underdamped D) Overdamped

Discuss

Answer & Solution

Answer: Option D

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

4

What is represented by state transition matrix of a system?

A) Free response B) Impulse response C) Step response D) Forced response

Discuss

Answer & Solution

Answer: Option A

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

5

The bode plot is applicable to:

A) Minimum phase network B) All phase network C) Maximum phase network D) None of the above

Discuss

Answer & Solution

Answer: Option A

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

6

In the field-controlled motor, the entire damping comes from:

A) The armature resistance B) The back emf C) The motor friction and load D) Field resistance

Discuss

Answer & Solution

Answer: Option C

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

7

Phase of the transfer function of the following circuit is:
Control Systems mcq question image

A) $${\tan ^{ - 1}}\left( {\frac{1}{{\omega RC}}} \right)$$ B) $${\tan ^{ - 1}}\left( {\omega RC} \right)$$ C) $${\tan ^{ - 1}}\left( {\frac{{RC}}{\omega }} \right)$$ D) $${\tan ^{ - 1}}\left( {\frac{\omega }{{RC}}} \right)$$

Discuss

Answer & Solution

Answer: Option A

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

8

The Bode plot of the transfer function G(s) = s is:
1. Constant magnitude
2. 20 dB/decade
3. Constant phase shift angle
4. Constant phase shift of $$\frac{\pi }{2}$$
Which of these are correct?

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

Discuss

Answer & Solution

Answer: Option D

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

9

What is the transfer function of a phase lead compensator? The values of β and τ are given as β < 1 and τ > 0.

A) $$\frac{{\beta \left( {\tau s + 1} \right)}}{{\left( {\beta \tau s + 1} \right)}}$$ B) $$\frac{{\beta \left( {\beta \tau s + 1} \right)}}{{\left( {\tau s + 1} \right)}}$$ C) $$\frac{{\beta \left( {\beta \tau s - 1} \right)}}{{\left( {\tau s + 1} \right)}}$$ D) $$\frac{{\beta \left( {\beta \tau s - 1} \right)}}{{\left( {\tau s - 1} \right)}}$$

Discuss

Answer & Solution

Answer: Option A

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

10

For the system described by \[\mathop {\rm{X}}\limits^ \cdot \] = AX match List-I with List-II and select the correct answer.

List-I (Matrix A)	List-II (Position of eigen values)
a. \[\left[ {\begin{array}{*{20}{c}} { - 1}&2\\ 0&{ - 2} \end{array}} \right]\]	1. One eigen value at the origin
b. \[\left[ {\begin{array}{*{20}{c}} { - 1}&{ - 2}\\ { - 2}&{ - 4} \end{array}} \right]\]	2. Both the eigen value in the LHP
c. \[\left[ {\begin{array}{*{20}{c}} 0&{ - 1}\\ 1&0 \end{array}} \right]\]	3. Both the eigen values in RHP
d. \[\left[ {\begin{array}{*{20}{c}} 1&0\\ 2&4 \end{array}} \right]\]	4. Both the eigen values on the imaginary axis

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

Discuss

Answer & Solution

Answer: Option B

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

Control Systems MCQ Questions & Answers | ECE