Chemical Engineering - Process Control and Instrumentation

36. 

Measurement of sub-zero Celcius temperature in industry is done most commonly by

A. thermocouples
B. resistance thermometers
C. gas thermometers
D. bi-metallic thermometers

Answer: Option B

Explanation:

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37. 

For the block diagram shown below :

The characteristic equation is

A. τl Sps + 1) + Kc . KplS + 1) ed s = 0
B. mS + 1) (τpS + 1) + Km . Kp ed S = 0
C. τl Sm S + 1) (τp S + 1) +Kc . Kp . Kml s + 1) edS = 0
D. ms + 1) (τp s + 1) + Kc . Kp . Km . edS = 0

Answer: Option C

Explanation:

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38. 

Use of I-control along with P-control facilitates

A. elimination of offset
B. reduction of offset
C. reduction of stability time
D. none of these

Answer: Option A

Explanation:

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39. 

Turbine flow meters are suitable for

A. very limited flow ranges.
B. cryogenic flow measurements.
C. aerospace and in air borne applications.
D. both (b) and (c).

Answer: Option D

Explanation:

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40. 

Liquid discharge from a tank or reservoir can not be measured by

A. orificemeters
B. weirs
C. mouthpieces
D. notches

Answer: Option A

Explanation:

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