ECE · all questions

Control Systems
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Q41

DC tachogenerator can be used in

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Q42

A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

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Q43

Which dc servomotor requires strongest permanent magnet?

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Q44

Which of the following is used to obtain output position in a position control system?

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Q45

Temperature is analogous to

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Q46

If any term in the first column of a Routh array becomes zero, then

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Q47

The charge q in the electrical system is analogous to which thermal system quantity?

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Q48

For open loop transfer function of a unit feedback is

G (s) = \frac{1}{s ( s + 2 )},

having peak overshoot 10%. Find damping ratio.

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Q49

Match List-I with List-II and select the correct answer, using the options given below:

List-I	List-II
a. Synchro	1. Amplifier
b. Amplidyne	2. Actuator
c. Servo motor	3. Compensator
d. RC network	4. Transducer

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Q50

The characteristic equation of a control system is given as s⁴ + 4s³ + 4s² + 3s + K = 0
What is the value of K for which this system is marginally stable?

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Q51

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?

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Q52

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

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Q53

The ac motor used in servo applications is a

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Q54

Overall transfer function of a system is given as

G (s) = \frac{2 s + 1}{s ^{2} + 2 s + 5} .

The system is characterized as

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Q55

Consider a unity feedback control system whose open loop transfer function is

G (s) = \frac{K}{s ( J s + F )}

Then for unit ramp input steady state error is given as

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Q56

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

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Q57

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?

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Q58

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:

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Q59

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

Control Systems mcq question image

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Q60

Consider an open - loop transfer function

G (s) = \frac{1}{( s + 2 ) ( s + 4 ) ( s ^{2} + 6 s + 25 )} .

What is the value of k which causes sustained oscillation in the closed - loop system?

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