Control Systems MCQ Questions & Answers

51

Consider the following statements about a proportional plus derivative controller
1. The maximum or peak overshoot is less
2. The stability of the system is less
3. The stability of the system is increased
4. The settling time is increases
Which of the above statements are correct?

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

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Answer & Solution

Answer: Option D

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52

In hydraulic controllers, the advantage of flapper valve over piston valve is the:

A) High sensitivity B) Better rigidity C) Higher hydraulic power control D) Control action being immune to friction and dirt

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Answer & Solution

Answer: Option B

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53

The ac motor used in servo applications is a

A) Single-phase induction motor B) 2-φ induction motor C) 3-φ induction motor D) Synchronous motor

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Answer & Solution

Answer: Option B

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54

Overall transfer function of a system is given as $$G\left( s \right) = \frac{{2s + 1}}{{{s^2} + 2s + 5}}.$$ The system is characterized as

A) Underdamped system B) Undamped system C) Critical damped system D) Overdamped system

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Answer & Solution

Answer: Option A

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55

Consider a unity feedback control system whose open loop transfer function is $$G\left( s \right) = \frac{K}{{s\left( {Js + F} \right)}}$$
Then for unit ramp input steady state error is given as

A) $${e_{ss}} = K$$ B) $${e_{ss}} = \frac{K}{F}$$ C) $${e_{ss}} = \frac{K}{{JF}}$$ D) $${e_{ss}} = \frac{F}{K}$$

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Answer & Solution

Answer: Option D

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56

If the characteristic equation of a closed-loop system is s² + 2s + 2 = 0, then the system is

A) overdamped B) critically damped C) underdamped D) undamped

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Answer & Solution

Answer: Option C

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57

What are the gain and phase angle of a system having the transfer function G(s) = (s + 1) at a frequency of 1 rad/sec?

A) 0.41 and 0° B) 1.41 and 45° C) 1.41 and -45° D) 2.41 and 90°

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Answer & Solution

Answer: Option B

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58

Consider a system described by the state model \[\mathop X\limits^. = \left[ {\begin{array}{*{20}{c}} 2&1\\ { - 1}&2 \end{array}} \right]X + \left[ \begin{array}{l} 1\\ 1 \end{array} \right]U{\rm{ and }}Y = \left[ {1\,\,1} \right]X\]
The system is:

A) Controllable but not observable B) Uncontrollable and observable C) Both controllable and observable D) Neither controllable nor observable

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Answer & Solution

Answer: Option C

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59

The signal flow diagram for a certain feedback control system is shown in figure
Now consider the following set of equations for the nodes
1. x₂ = a₁x₁ + a₉x₃
2. x₃ = a₂x₂ + a₈x₄
3. x₄ = a₃x₃ + a₅x₂
4. x₅= a₄x₄ + a₆x₂
Which of the following are correct?
Control Systems mcq question image

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

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Answer & Solution

Answer: Option D

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60

Consider an open - loop transfer function $$G\left( s \right) = \frac{1}{{\left( {s + 2} \right)\left( {s + 4} \right)\left( {{s^2} + 6s + 25} \right)}}.$$ What is the value of k which causes sustained oscillation in the closed - loop system?

A) 555.25 B) 666.25 C) 999.25 D) 1111.25

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Answer & Solution

Answer: Option B

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Control Systems MCQ Questions & Answers | ECE