Chemical Engineering - Process Control and Instrumentation

46. 

Which of the following controllers has maximum offset ?

A. P-controller
B. P-I controller
C. P-D controller
D. P-I-D controller

Answer: Option A

Explanation:

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47. 

Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

A. ionisation
B. Pirani
C. Mcloid
D. none of these

Answer: Option C

Explanation:

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48. 

High temperature of around 2000°C of incandescent gas mantles is measured by a/an

A. specially designed thermocouple.
B. optical pyrometer.
C. radiation pyrometer.
D. none of these.

Answer: Option C

Explanation:

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49. 

The unit step response of the transfer function 1/(s2 + 2s + 3)

A. has a non-zero slope at the origin.
B. has a damped oscillatory characteristics.
C. is overdamped
D. is unstable

Answer: Option B

Explanation:

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50. 

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

A.
B.
C.
D.

Answer: Option C

Explanation:

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