Control Systems MCQ Questions & Answers

11

There are 2 systems:
1. An automatic washing machine
2. An automatic intensity adjustable light bulb
Which of these systems will be more sensitive to the variation in system's gain?

A) Data is insufficient B) Automatic intensity adjustable light bulb C) Both will be equally sensitive D) Automatic washing machine

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Answer & Solution

Answer: Option D

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12

Find the overall transfer function for the following system
Control Systems mcq question image

A) $$\frac{{Y\left( s \right)}}{{R\left( s \right)}} = \frac{{2s + 4}}{{{s^2}}}$$ B) $$\frac{{Y\left( s \right)}}{{R\left( s \right)}} = \frac{{2s + 4}}{{{s^2} + 2s + 4}}$$ C) $$\frac{{Y\left( s \right)}}{{R\left( s \right)}} = \frac{{4s + 2}}{{{s^2} + 4s + 2}}$$ D) $$\frac{{Y\left( s \right)}}{{R\left( s \right)}} = \frac{{2s + 4}}{{{s^2} + 4s + 2}}$$

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Answer & Solution

Answer: Option B

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13

The transfer function of a phase lead network, as shown in the figure below is $$\frac{{K\left( {1 + 0.3s} \right)}}{{\left( {1 + 0.17s} \right)}}$$
The values of R₁ and R₂ are respectively
Control Systems mcq question image

A) 300 kΩ and 300 kΩ B) 300 kΩ and 400 kΩ C) 400 kΩ and 300 kΩ D) 400 kΩ and 400 kΩ

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Answer & Solution

Answer: Option B

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14

A typical control system is shown in the figure. Assuming $$R\left( s \right) = \frac{1}{s}$$ the steady-state error is given by,

A) $$\frac{1}{{1 + K}}$$ B) K C) Zero D) -19

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Answer & Solution

Answer: Option C

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15

Find the points at which the root locus crosses the jω axis for the unity feedback system with feed forward transfer function.
$$G\left( s \right) = \frac{K}{{\left( {{s^2} + 2s + 2} \right)\left( {{s^2} + 2s + 5} \right)}}$$

A) ±2.1042 B) ±1.8708 C) ±1.3615 D) ±2.6214

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Answer & Solution

Answer: Option B

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16

The characteristic equation of a certain feedback control system is given by s⁴ + 4s³ + 13s² + 36s + k = 0. The range of values of k for which the feedback system is stable, is given by:

A) 0 < k < 4 B) 4 < k < 36 C) 0 < k < 36 D) 13 < k < 36

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Answer & Solution

Answer: Option C

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17

The open loop transfer function $$G\left( s \right) = \frac{{k\left( {s + 10} \right)}}{{\left( {s + 2} \right)\left( {s + 5} \right)}},$$ the break point lies in the root locus in between . . . . . . . .

A) 0 to 2 B) 0 to -2 C) -2 to -5 D) -5 to -10

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Answer & Solution

Answer: Option C

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18

The common range of step size in stepper motor which are interfaced with micro processor based systems is

A) 0° to 10° B) 10° to 29° C) 0.9° to 30° D) 0.3° to 45°

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Answer & Solution

Answer: Option C

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19

A unity feedback system has $$G\left( s \right) = \frac{{K\left( {s + 12} \right)}}{{\left( {s + 14} \right)\left( {s + 18} \right)}}.$$
What is the value of K to yield 10% error in steady state?

A) 672 B) 189 C) 100 D) 21

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Answer & Solution

Answer: Option B

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20

The input to a controller is:

A) sensed signal B) error signal C) desired variable value D) signal of fixed amplitude not dependent on desired variable value

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Answer & Solution

Answer: Option B

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Control Systems MCQ Questions & Answers | ECE