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Process Control and Instrumentation
Comments
Question
Out of the following themocouple wire insulating material, the highest temperature rating is for
Options
A. teflon
B. ceramic fibre
C. asbestos
D. fibre glass
Correct Answer
ceramic fibre
Process Control and Instrumentation problems
Search Results
1. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.
Options
A. load
B. manipulated
C. controlled
D. none of these
Show Answer
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Discuss
Correct Answer: load
2. Thermal wells used in temperature measurements should have
Options
A. very thick walls.
B. low emissivity.
C. polished surface.
D. high transmissivity of radiation.
Show Answer
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Discuss
Correct Answer: high transmissivity of radiation.
3. Which of the following is not a second order instrument?
Options
A. Mercury in glass thermometer with covering.
B. Bare mercury in glass thermometer.
C. Pressure gauge with one bellow, two tubes and a tank.
D. None of these.
Show Answer
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Correct Answer: Bare mercury in glass thermometer.
4. Flow rate of sludge is not measured by a/an
Options
A. orificemeter
B. open weir
C. kennison nozzle
D. both(b)&(c)
Show Answer
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Discuss
Correct Answer: both(b)&(c)
5. __________ type of element is normally not used in the bimetallic thermometers.
Options
A. Flat spiral
B. Bourdon tube
C. Single helix
D. Multiple helix
Show Answer
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Discuss
Correct Answer: Bourdon tube
6. Which of following error integral is considered as the best criterion in controller settings?
Options
A.
B.
C.
D. none of these
Show Answer
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Discuss
Correct Answer:
7. Thermistors are used in __________ devices.
Options
A. voltage measuring
B. temperature measuring
C. temperature compensating
D. both(b)&(c)
Show Answer
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Discuss
Correct Answer: both(b)&(c)
8. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to
Options
A. d
B. d
2
C. d
3
D. d
4
Show Answer
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Discuss
Correct Answer: d
4
9. Stalagmometer is used for the measurement of
Options
A. kinematic viscosity
B. surface tension
C. refractive index
D. optical activity
Show Answer
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Discuss
Correct Answer: surface tension
10. Phase lag of the frequency response of a second order system to a sinusoidal forcing function
Options
A. is 30°
B. is 90° at the most
C. approaches 180° asymptotically
D. is 120°
Show Answer
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Discuss
Correct Answer: approaches 180° asymptotically
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