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Control Systems

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

 20.
 50.
 0.
 infinity.

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Control Systems
Transfer function of zero order hold response is

 (1 / s) × (1 - est).
 (1 / s) × e-st.
 (s) × (1 - est).
 (1 / s) × (1 - e-st).

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Control Systems
A proportional plus integral controller

 increases the stability of the system
 both 2 and 3
 has high sensitivity
 it increases rise time

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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).u(t-1)
 c(t)u(t)
 c(t-1).u(t)

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Control Systems
Type and order of transfer function G (s) = K / {s(s + 2)}

 1, 2.
 2, 1.
 0, 2.
 1, 1.

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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°
 180°
 -90°
 90°

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