Chemical Engineering - Process Control and Instrumentation

46. 

Thermal wells used in temperature measurements should have

A. very thick walls.
B. low emissivity.
C. polished surface.
D. high transmissivity of radiation.

Answer: Option D

Explanation:

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47. 

Which of the following flow-metering instru-ments is an areameter ?

A. Venturimeter
B. Rotameter
C. Pitot tube
D. Hot wire anemometer

Answer: Option B

Explanation:

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48. 

Out of the following themocouple wire insulating material, the highest temperature rating is for

A. teflon
B. ceramic fibre
C. asbestos
D. fibre glass

Answer: Option B

Explanation:

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49. 

Which is the most suitable instrument for measuring pressure below 3 microns ?

A. Mcleoid gauge
B. Alphatron
C. Ionisation gauge
D. Bourdon guage

Answer: Option C

Explanation:

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50. 

Routh stability method uses __________ loop transfer function.

A. open
B. closed
C. either (a) or (b)
D. neither (a) nor (b)

Answer: Option B

Explanation:

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