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Process Control and Instrumentation
Comments
Question
Flow rate of a river is measured by a/an
Options
A. pitot tube
B. vane meter
C. kennison nozzle
D. open weir
Correct Answer
vane meter
Process Control and Instrumentation problems
Search Results
1. The transfer function for a P-D controller is
Options
A.
K
c
(1+?
D
s
)
B.
K
c
(1 +1/?
D
s
)
C.
K
c
?
D
s
D.
K
c
/?
D
s
Show Answer
Scratch Pad
Discuss
Correct Answer:
K
c
(1+?
D
s
)
2. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its
Options
A. speed of response
B. reproducibility
C. fidielity
D. static characteristics
Show Answer
Scratch Pad
Discuss
Correct Answer: fidielity
3. Which of the following can not measure a temperature of 1600°C?
Options
A. Platinum resistance thermometer
B. Thermocouple
C. Photo-electric pyrometer
D. Radiation pyrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: Platinum resistance thermometer
4. The frequency response of a first order system, has a phase shift with lower and upper bounds given by
Options
A. - ?, ?/2
B. -?/2, ?/2
C. -?/2, 0
D. 0, ?/2
Show Answer
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Discuss
Correct Answer: 0, ?/2
5. Specific gravity of a liquid can not be measured by a/an
Options
A. anemometer
B. specific gravity bottle
C. pycnometer
D. hydrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: anemometer
6. Dead zone is the
Options
A. same as time constant.
B. same as transportation lag.
C. maximum change in the variable that does not change the reading of the instrument.
D. none of these.
Show Answer
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Discuss
Correct Answer: maximum change in the variable that does not change the reading of the instrument.
7. Which thermocouple can be used to measure a temperature of around 1400°C?
Options
A. Copper-constantan
B. Aluminium-chromel
C. Platinum-platinum+rhodium
D. None of these
Show Answer
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Discuss
Correct Answer: Platinum-platinum+rhodium
8. Which of the following thermocouples can measure the maximum temperature?
Options
A. Platinum-rhodium
B. Tungsten-molybdenum
C. Chromel-alumel
D. Iron-constantan
Show Answer
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Discuss
Correct Answer: Tungsten-molybdenum
9. Gas chromatography is used for the measurement of
Options
A. temperature
B. pressure
C. concentration
D. flow rate
Show Answer
Scratch Pad
Discuss
Correct Answer: concentration
10. Thermistors are made of
Options
A. ultra pure metals
B. metal oxides
C. iron-copper alloys
D. nickel-chromium alloys
Show Answer
Scratch Pad
Discuss
Correct Answer: metal oxides
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