Control Systems MCQ Questions & Answers

61

Number of state variables of discrete time system, described by $$y\left[ n \right] - \frac{3}{4}y\left[ {n - 1} \right] + \frac{1}{8}y\left[ {n - 2} \right] = x\left[ n \right]$$ is

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

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Answer & Solution

Answer: Option A

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62

The acceleration error constant is given by

A) $$\mathop {\lim }\limits_{s \to 0} G\left( s \right)$$ B) $$\mathop {\lim }\limits_{s \to 0} sG\left( s \right)$$ C) $$\mathop {\lim }\limits_{s \to 0} {s^2}G\left( s \right)$$ D) $$\mathop {\lim }\limits_{s \to 0} {s^3}G\left( s \right)$$

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Answer & Solution

Answer: Option C

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63

The mathematical model of a system is linear, if it obeys the principle of

A) Superposition B) Homogeneity C) Reciprocity D) Superposition and Homogeneity

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Answer & Solution

Answer: Option D

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64

Match List-I with List-II and select the correct answer:

List-I (Scientist)	List-II (Contribution in the area of)
a. Bode	1. Asymptotic plots
b. Evans	2. Polar plots
c. Nyquist	3. Root locus technique
	4. Constant M and N plots

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

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Answer & Solution

Answer: Option D

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65

Consider that in a system loop transfer function, addition of a pole results in the following:
1. Root locus gets pulled to the right-hand side.
2. Steady-state-error is increased.
3. System responses gets slower.
Which of the above statements are correct?

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

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Answer & Solution

Answer: Option C

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66

In Force-Voltage Analogy

A) Force is analogous to current B) Mass is analogous to capacitance C) Velocity is analogous to current D) Displacement is analogous to magnetic flux linkage

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Answer & Solution

Answer: Option C

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67

Which of the following are the features of the breakaway point in the root-locus of a closed loop control system with the characteristic equation 1 + KG₁(s) H₁(s) = 0?
1. It need not always occur only on the real axis.
2. At this point G₁(s) H₁(s) = 0
3. At this point $$\frac{{{\text{dK}}}}{{{\text{ds}}}} = 0$$
Select the correct answer using the options given below:

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

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Answer & Solution

Answer: Option D

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68

From the below figure we can conclude
Control Systems mcq question image

A) r₁r₂ pole, r₃r₄ pole, r₅ zero B) r₁r₂ zero, r₃r₄ zero, r₅ pole C) r₁r₂ pole, r₃r₄ zero, r₅ zero D) r₁r₂ zero, r₃r₄ pole, r₅ pole

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Answer & Solution

Answer: Option A

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69

Consider the following servomotors:
1. AC two-phase servometer
2. DC servomotor
3. Hydraulic servomotor
4. Pneumatic servomotor
The correct sequence of these servomotors in increasing order of power handling capacity is:

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

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Answer & Solution

Answer: Option C

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70

For drawing the root locus plot of a certain closed - loop control system, one needs to know

A) Only the open - loop transfer function of the system B) The closed - loop transfer function C) The closed - loop system pole - zero map D) The open - loop transfer function, gain and phase margins

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Answer & Solution

Answer: Option A

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Control Systems MCQ Questions & Answers | ECE