Control Systems MCQs with Answers 2027

Q61

A composite R-C network yielded the following transfer function when calculated from its components:

T (s) = \frac{C ( s )}{R ( s )} = \frac{1 + 21 s + 20 s ^{2}}{1 + 11 s + 10 s ^{2}}

This network can be used as which one of the following?

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Q62

Open question

In a synchro error detection, the output voltage is proportional to [ω(t)]ⁿ, where ω(t) is the rotor velocity and n equals to

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Q63

Open question

If the gain of the system is reduced to zero value, the roots of the system in the s-plane:

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Q64

Open question

For a state space representation of a system

{\rm{A}} = \left[ {\begin{array}{*{20}{c}} 0&1\\ { - 3}&{ - 2} \end{array}} \right],\,{\rm{B}} = \left[ \begin{array}{l} 0\\ 1 \end{array} \right]

and C = [1 2] . Then transfer function of system would be:

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Q65

Open question

Consider the following statements regarding the asymptotic Bode plots used for frequency response analysis:
1. The deviation of the actual magnitude response for a zero on real axis is 3 dB at the corner frequency.
2. The phase angle for a pair of complex conjugate poles at undamped frequency depends upon the value of damping ratio.
Which of the statements given above is/are correct?

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Q66

Open question

In root locus method, the value of K is obtained as

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Q67

Open question

Consider a unity feedback system having a transfer function

G (s) = \frac{100}{s ( 0.1 s + 1 )}

is subjected to ramp input. The steady-state error is:

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Q68

Open question

The transfer function of a tachometer is of the form

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Q69

Open question

A unity feedback system has

G (s) = \frac{K ( 2 s + 1 )}{s ( 4 s + 1 ) ( s + 1 ) ^{2}}

What is the value of K if the steady-state value of error is to be less than 0.1 when an input r(t) = 1 + 5t is applied?

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Q70

Open question

If the output of the system at steady state doesn't agree with the input, then the system is said to have . . . . . . . . which determines the . . . . . . . . of the system.

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Q71

Open question

The asymptotic bode plot for the gain magnitude of a minimum phase system G(s) is shown in figure below.
The steady state error for the ramp input is
Control Systems mcq question image

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Q72

Open question

Check the system with characteristic equation F(s) = s⁴ + 3s³ + 2s² + s + 1 for stability.

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Q73

Open question

. . . . . . . . indicate not only whether a system is stable, but also its degree of stability and how stability may be improved if necessary.

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Q74

Open question

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

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Q75

Open question

A system with a unity gain margin and zero phase margin is . . . . . . . .

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Q76

Open question

What is the time response of a system whose poles lie on the right hand side of s-plane?

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Q77

Open question

Consider the mechanical system shown in the given figure. If the system is set into motion by unit impulse force, the equation of the resulting oscillation will be:
Control Systems mcq question image

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Q78

Open question

In position control systems, Tachogenerator feedback is used to:

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Q79

Open question

A tachometer feedback is used as an inner loop in a position control servo-system. What is the effect of feedback on the gain of the sub-loop incorporating tachometer and on the effective time constant of the system?

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Q80

Open question

Which of the following can be used as a tachogenerator in control system?

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