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Process Control and Instrumentation
Comments
Question
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
Correct Answer
0, ?/2
Process Control and Instrumentation problems
Search Results
1. 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
2. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.
Options
A. no change
B. decrease
C. increase
D. exponential decrease
Show Answer
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Discuss
Correct Answer: increase
3. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.
Options
A. 0-100
B. < 0
C. > 100.
D. > 50
Show Answer
Scratch Pad
Discuss
Correct Answer: > 100.
4. Concentration of sugar solution can be determined by the
Options
A. polarimetry
B. flame photometry
C. emission spectroscopy
D. oscillometry
Show Answer
Scratch Pad
Discuss
Correct Answer: polarimetry
5. Humidity of air can be determined by a
Options
A. chromatograph
B. sling psychrometer
C. mass spectrometer
D. polarimeter
Show Answer
Scratch Pad
Discuss
Correct Answer: sling psychrometer
6. 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
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Discuss
Correct Answer: Platinum resistance thermometer
7. 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
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Discuss
Correct Answer: fidielity
8. 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
)
9. Flow rate of a river is measured by a/an
Options
A. pitot tube
B. vane meter
C. kennison nozzle
D. open weir
Show Answer
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Discuss
Correct Answer: vane meter
10. 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
Scratch Pad
Discuss
Correct Answer: maximum change in the variable that does not change the reading of the instrument.
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