Control Systems MCQ Questions & Answers

71

The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by
Control Systems mcq question image

A) $$G\left( s \right)H\left( s \right) = K\frac{{s\left( {s + 1} \right)}}{{\left( {s + 2} \right)\left( {s + 3} \right)}}$$ B) $$G\left( s \right)H\left( s \right) = K\frac{{\left( {s + 1} \right)}}{{s\left( {s + 2} \right){{\left( {s + 3} \right)}^2}}}$$ C) $$G\left( s \right)H\left( s \right) = K\frac{1}{{s\left( {s - 1} \right)\left( {s + 2} \right)\left( {s + 3} \right)}}$$ D) $$G\left( s \right)H\left( s \right) = K\frac{{\left( {s + 1} \right)}}{{s\left( {s + 2} \right)\left( {s + 3} \right)}}$$

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Answer & Solution

Answer: Option B

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72

The largest error between reference input and output during the transient period is called:

A) peak error B) transient overshoot C) peak overshoot D) transient deviation

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Answer & Solution

Answer: Option C

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73

The block diagram of a feedback system is shown in the figure.
The transfer function $$\frac{{Y\left( s \right)}}{{X\left( s \right)}}$$ of the system is
Control Systems mcq question image

A) $$\frac{{{G_1} + {G_2} + {G_1}{G_2}H}}{{1 + {G_1}H}}$$ B) $$\frac{{{G_1} + {G_2}}}{{1 + {G_1}H + {G_2}H}}$$ C) $$\frac{{{G_1} + {G_2}}}{{1 + {G_1}H}}$$ D) $$\frac{{{G_1} + {G_2} + {G_1}{G_2}H}}{{1 + {G_1}H + {G_2}H}}$$

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Answer & Solution

Answer: Option C

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74

In a type 2 system, if a pole has been added, it will cause:

A) lag compensation B) no compensation C) lead compensation D) lead-lag compensation

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Answer & Solution

Answer: Option A

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75

A family of constant N circles has the centre as:

A) $$X = 1{\text{ and }}Y = 2N$$ B) $$X = - \frac{1}{4}{\text{ and }}Y = 4N$$ C) $$X = - \frac{1}{2}{\text{ and }}Y = \frac{1}{{4N}}$$ D) $$X = - \frac{1}{2}{\text{ and }}Y = \frac{1}{{2N}}$$

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Answer & Solution

Answer: Option D

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76

In the signal flow graph of figure, $$\frac{{\text{y}}}{{\text{x}}}$$ equals
Control Systems mcq question image

A) 3 B) $$\frac{5}{2}$$ C) 2 D) None of the above

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Answer & Solution

Answer: Option C

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77

A negative-feedback closed-loop system is supplied with an input of 5 V, the system has a forward gain of 1 and a feedback gain of 1. What is the output voltage?

A) 1.0 V B) 1.5 V C) 2.0 V D) 2.5 V

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Answer & Solution

Answer: Option D

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78

For the system $$\frac{2}{{s + 1}},$$ the approximate time taken for a step response to reach 98% of its final value is

A) 1 s B) 2 s C) 4 s D) 8 s

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Answer & Solution

Answer: Option C

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79

Gain cross over frequency is the frequency at which gain is

A) unity B) 0 C) ∞ D) 2

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Answer & Solution

Answer: Option A

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80

Consider the following statements relating to synchros:
1. The rotor of the control transformer is either disc shaped.
2. The rotor of the transmitter is so constructed as to have a low magnetic reluctance.
3. Transmitter and control transformer pair is used as an error detector.
Which of these statements are correct?

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 C

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Control Systems MCQ Questions & Answers | ECE