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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
A barometer measures the __________ pressure.
Options
A. absolute
B. gauge
C. absolute as well as gauge
D. dynamic
Correct Answer
absolute
Process Control and Instrumentation problems
Search Results
1. Liquid flow rate in a small channel is best measured by a/an
Options
A. weir
B. pitot tube
C. vane meter
D. venturimeter
Show Answer
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Discuss
Correct Answer: pitot tube
2. Which of the following thermometers is not suitable for distant reading upto 60 metres?
Options
A. Vapor pressure thermometer
B. Mercury in glass thermometer
C. Constant volume gas thermometer
D. Resistance thermometer
Show Answer
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Discuss
Correct Answer: Mercury in glass thermometer
3. The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is
Options
A. 0
B. 1/2
C. 1
D. 2
Show Answer
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Correct Answer: 1/2
4. Which of the following thermocouple materials does not contain nickel?
Options
A. Alumel
B. Chromel
C. Constantan
D. None of these.
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Correct Answer: None of these.
5. Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the
Options
A. enhancement or attentuation of redia-tion occurs in the sighting path.
B. object and surrounding are at almost the same temperature.
C. object has varying emissivity.
D. object is transparent.
Show Answer
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Correct Answer: object and surrounding are at almost the same temperature.
6. Radiation pyrometers as compared to thermocouples
Options
A. has a slower speed of response.
B. can measure higher temperature.
C. can't measure the temperature of moving objects.
D. is more affected by corrosive atmosphere.
Show Answer
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Correct Answer: can measure higher temperature.
7. Pick out the wrong statement
Options
A. Proportional controller is normally used for level control in industrial applications.
B. CSTR can be considered as a distributed parameter system.
C. Distributed parameter approach gives partial differential equation.
D. Non-linear behaviour is exemplified by an on-off controller.
Show Answer
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Correct Answer: CSTR can be considered as a distributed parameter system.
8. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?
Options
A. Mercury in glass thermometer
B. Mercury in steel thermometer
C. Alcohol in glass thermometer
D. Fused metal (Na or K) in steel thermometer
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Correct Answer: Alcohol in glass thermometer
9. Range of hydrogen gas constant volume themometer is __________ °C.
Options
A. -10 to 20
B. 0 to 100
C. 100 - 500
D. 400 - 1000
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Correct Answer: 0 to 100
10. A sinusoidal variation in the input passing through a linear first order system
Options
A. becomes more oscillatory (frequency increases).
B. becomes less oscillatory (frequency decreases).
C. gets amplified (magnitude increases).
D. gets attenuated (magnitude decreases).
Show Answer
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Discuss
Correct Answer: gets attenuated (magnitude decreases).
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