Control Systems MCQ Questions & Answers

41

The state equation of a system is \[\mathop X\limits^ \cdot = \left[ {\begin{array}{*{20}{c}} 0&1\\ { - 20}&9 \end{array}} \right]X + \left[ \begin{array}{l} 0\\ 1 \end{array} \right]u\]
The poles of this system are located at:

A) -1, -9 B) -1, -20 C) -4, -5 D) -9, -20

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Answer & Solution

Answer: Option C

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42

An automatic washing machine is

A) A single feedback control system B) A multi-feedback control system C) An open loop control system D) None of these

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Answer & Solution

Answer: Option C

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43

The initial slope of a type 2 system is

A) -20db/dec B) -40db/dec C) +40 db/dec D) +20db/dec

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Answer & Solution

Answer: Option B

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44

The system represented by the block diagram in the following figure is a hybrid servo system.
The components labelled 1, 2, 3 and 4 respectively
Control Systems mcq question image

A) Amplifier, demodulator, dc servomotor and load B) Demodulator, amplifier, dc servomotor and load C) Demodulator, dc servomotor, amplifier and load D) Amplifier, dc servomotor, demodulator and load

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Answer & Solution

Answer: Option D

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45

For good response of a second order control system-
1. higher tp (peak time) is needed
2. the maximum or peak overshoot must be less
3. The steady state error(ess) is less
4. The maximum or peak overshoot must be higher
Which of the above statements are correct?

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

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Answer & Solution

Answer: Option D

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46

Which of the following statements concerning the Bode plot are correct?
1. The relative stability can be obtained using Bode plots.
2. For a system with time delay, the phase plot does not reach a minimum value.
3. For a minimal system phase system, the phase plot reaches a minimum value.
4. Gain and phase margin can be used to ascertain the stability of a system using Bode plot.

A) 1, 2, 3 and 4 are correct B) Only 3 and 4 are correct C) Only 1, 2 and 4 are correct D) Only 2, 3 and 4 are correct

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Answer & Solution

Answer: Option A

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47

Consider the following systems:
Which of these systems can be modelled by the differential equation, $${a_2}\frac{{{d^2}y\left( t \right)}}{{d{t^2}}} + {a_1}\frac{{dy\left( t \right)}}{{dt}} + {a_0}y\left( t \right) = x\left( t \right)?$$
Control Systems mcq question image

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

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Answer & Solution

Answer: Option A

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48

For a unity feedback system with open-loop transfer function $$\frac{{25}}{{s\left( {s + 6} \right)}},$$ the resonant peak output M_m and the corresponding resonant frequency ω_m are, respectively

A) 2.6 and 2.67 r/s B) 1.04 and 2.67 r/s C) 2.6 and 4.8 r/s D) 1.04 and 4.8 r/s

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Answer & Solution

Answer: Option B

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49

The relative stability and the transient performance of a closed loop control system are directly related to location of

A) Poles in the left half plane B) Zeros in the right half plane C) Closed-loop roots of the characteristic equation in the s plane D) Open loop poles

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Answer & Solution

Answer: Option C

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50

The output is said to be zero state response because . . . . . . . . conditions are made equal to zero.

A) Initial B) Final C) Steady state D) Impulse response

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Answer & Solution

Answer: Option A

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Control Systems MCQ Questions & Answers | ECE