Control Systems MCQ Questions & Answers

91

The characteristics equation of a closed loop control system is given as s² + 4s + 16 = 0. The resonant frequency in radian/sec of the system is

A) 2 B) $$2\sqrt 3 $$ C) 4 D) $$2\sqrt 2 $$

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Answer & Solution

Answer: Option D

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92

What is the number of root-locus segments which do not terminate on zeros?

A) The number of poles B) The number of zeros C) The difference between the number of poles and the number of zeros D) The sum of the number of poles and the number of zeros

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Answer & Solution

Answer: Option C

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93

Consider the feedback system shown in the figure. The Nyquist plot of G(s) is also shown. Which one of the following conclusions is correct?
Control Systems mcq question image

A) G(s) is an all-pass filter B) G(s) is a strictly proper transfer function C) G(s) is a stable and minimum-phase transfer function D) The closed-loop system is unstable for sufficiently large and positive k

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Answer & Solution

Answer: Option D

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94

If the initial conditions for a system are inherently zero, what does it physically mean?

A) The system is at rest but stores energy B) The system is working but does not store energy C) The system is at rest or no energy is stored in any of its parts D) The system is working with zero reference input

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Answer & Solution

Answer: Option C

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95

Which of the following statements with respect to the stability of a control system is true?
1. The roots of the characteristic equation are on the left half of the s-plane.
2. The system is bounded input bounded output (BIBO) stable.
3. Stability is independent of the input.
4. The roots of the characteristic equation are on the left half of the s-plane and on the imaginary axis.

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

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Answer & Solution

Answer: Option C

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96

In the Bode diagram of $$H\left( s \right) = 1 + \frac{s}{{10}},$$ phase at ω = 10 is

A) 45° B) -45° C) 90° D) -90°

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Answer & Solution

Answer: Option A

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97

A process is controlled by a PID controller. The sensor has high measurement noise. How can this effect be reduced?

A) By use of a bandwidth limited derivative term B) By use of proportional and derivative terms in the forward path C) By use of high proportional band D) By use of low integral gain

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Answer & Solution

Answer: Option B

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98

In a servo-system, the device used for providing derivative feedback is known as:

A) Synchro B) Servomotor C) Potentiometer D) Tachogenerator

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Answer & Solution

Answer: Option D

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99

The type of system shown in the bode plot here is:
Control Systems mcq question image

A) 3 B) 1 C) 2 D) 0

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Answer & Solution

Answer: Option D

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100

In a feedback system, feedback factor of 0.1 is used with forward gain of 10. The sensitivity of the system with respect to the feedback element is

A) -0.5 B) 0.5 C) -0.9 D) 0.9

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Answer & Solution

Answer: Option A

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Control Systems MCQ Questions & Answers | ECE