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Control Systems

Control Systems
Which of the following is/are the example of actuator?

 Electric motor
 Pneumatic motor
 Hydraulic motor
 All

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Control Systems
The second order system defined by 25/(s2 + 5s + 25) is given a step input. The time taken for the output to settle with in 2 % of input is

 1.6 sec.
 2 sec.
 1.2 sec.
 0.4 sec.

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Control Systems
Which of the following controller is also known as anticipatory controller?

 integral controller
 both 1 and 3
 derivative controller
 proportional controller

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Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 -90°
 180°
 -180°
 90°

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Control Systems
A proportional plus derivative controller

 improves the steady state accuracy
 increases the stability of the system
 has high sensitivity
 both 1 and 2

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Control Systems
Sparking between the contacts can be reduced by inserting

  a capacitor in parallel with the contacts.
 a reactor in the line.
 a capacitor in series with the contacts.
 a resistor in the line.

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