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Control Systems

Control Systems
For a unity feedback control system open loop transfer function then position error constant is

 0.
 infinity.
 40.
 20.

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Control Systems
The characteristic equation for closed loop system is given as . The value of k for which the system becomes just stable is

 2
 8
 4
 6

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Control Systems
Accurate and reliable output is possible with which of the following system?

 Closed loop control system
 Both 1 and 2
 Open loop control system
None of these

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Control Systems
By using which of the following elements, mechanical translational systems are obtained?

 mass element
 spring element
 dash-pot
All of these

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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

 -180°
 -90°
 180°
 90°

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

 Oscillatory response.
 Complex and costly.
All of these
 Reduces the overall gain.

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