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Chemical Engineering
‣
Process Control and Instrumentation
Comments
Question
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
Correct Answer
1/2
Process Control and Instrumentation problems
Search Results
1. Which of the following thermocouple materials does not contain nickel?
Options
A. Alumel
B. Chromel
C. Constantan
D. None of these.
Show Answer
Scratch Pad
Discuss
Correct Answer: None of these.
2. 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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Discuss
Correct Answer: object and surrounding are at almost the same temperature.
3. A non-linear chemical system is exemplified by a/an
Options
A. isothermal CSTR
B. mixer
C. non-isothermal CSTR
D. none of these
Show Answer
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Discuss
Correct Answer: non-isothermal CSTR
4. The time constant of a first order process with resistance R and capacitance C is
Options
A. R + C
B. R - C
C. RC
D. 1/RC
Show Answer
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Discuss
Correct Answer: RC
5. Bode diagram is a plot of
Options
A. log (
AR
)
vs
. log (
f
) and (?) vs. log (
f
).
B. log (
AR
)
vs
.
f
and log ?
vs
.
f
.
C.
AR
vs
. log (
f
) and ?
vs
. log (
f
).
D. none of these.
Show Answer
Scratch Pad
Discuss
Correct Answer: log (
AR
)
vs
. log (
f
) and (?) vs. log (
f
).
6. 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
7. 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
8. A barometer measures the __________ pressure.
Options
A. absolute
B. gauge
C. absolute as well as gauge
D. dynamic
Show Answer
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Discuss
Correct Answer: absolute
9. 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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Discuss
Correct Answer: can measure higher temperature.
10. 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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Discuss
Correct Answer: CSTR can be considered as a distributed parameter system.
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