Which of the systems having following transfer functions is stable? 1/(s2+ 2) 1/

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Question
Which of the systems having following transfer functions is stable?
Options
A. 1/(s²+ 2)
B. 1/(s²-2s + 3)
C. 1/(s² + 2s + 2)
D. exp(-20s)/(s² + 2s-l)

Correct Answer

1/(s² + 2s + 2)

Process Control and Instrumentation problems

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3. The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below :

The appropriate transfer function of the process is
Options
A.
B.
C.
D.

4. The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system
Options
A. depends only upon the open loop transfer function.
B. determines its stability.
C. is the same for set point or load changes.
D. all 'a', 'b' & 'c'

6. High temperature of around 2000�C of incandescent gas mantles is measured by a/an
Options
A. specially designed thermocouple.
B. optical pyrometer.
C. radiation pyrometer.
D. none of these.

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