Chemical Engineering - Process Control and Instrumentation

26. 

Temperature measuring instruments are standardised mostly with __________ points of pure substances.

A. melting
B. boiling
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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27. 

Pick out the first order system from among the following.

A. Damped vibrator.
B. Mercury in glass thermometer kept in boiling water.
C. Interacting system of two tanks in series.
D. Non-interacting system of two tanks in series.

Answer: Option B

Explanation:

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28. 

The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

A. 250
B. 500
C. 750
D. 1000

Answer: Option B

Explanation:

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29. 

Which of the following controllers has the least maximum deviation ?

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

Answer: Option D

Explanation:

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30. 

Volumetric expansion is the working principle of the __________ thermometers.

A. mercury in glass
B. constant volume gas
C. vapor pressure
D. bimetallic

Answer: Option A

Explanation:

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