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Control Systems

Control Systems
A second order control system has a transfer function 16/(s² + 4s + 16). Find the settling time for 2% tolerance?

 2 sec
 5 sec
 10 sec
 4 sec

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

 All
 Hydraulic motor
 Pneumatic motor
 Electric motor

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Control Systems
Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

 c(t-1).u(t-1)
 c(t-1).u(t)
 c(t).u(t-1)
 c(t)u(t)

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Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (-2,0)
 (1,0)
 (2,0)
 (-1,0)

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Control Systems
The phase of lead compensator of the system G ( s ) = ( s + a ) / ( s + b ) is at its maximum at:

  √( ab ).
 √( a / b).
  ab.
  a / b.

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Control Systems
A transfer function has a zero at s = -1 and poles at s = -1 ± j1. The multiplier being unity, if the input is step function, the steady state response is given by

 0.5∠0°
 0.5∠10°
 2∠90°
 1∠0°

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