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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
Flame photometry is used for the determination of compositional analysis of
Options
A. solids
B. alkali metals
C. natural gas
D. isotopes
Correct Answer
alkali metals
Process Control and Instrumentation problems
Search Results
1. Conversion formula for converting amplitude ratio (
AR
) into decibels is
Options
A. Decibel = 20 log
10
(
AR
)
B. Decibel = 20 log
e
(
AR
)
C. Decibel = 20 log
10
(
AR
)
0.5
D. Decibel = 20 log
e
(
AR
)
0.5
Show Answer
Scratch Pad
Discuss
Correct Answer: Decibel = 20 log
10
(
AR
)
2. If response of a control system is to be free of offset and oscillation, the most suitable controller is
Options
A. proportional controller.
B. proportional-derivative(PD)controller.
C. proportional-integral (PI) controller.
D. proportional integral-derivative (PID) controller.
Show Answer
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Discuss
Correct Answer: proportional integral-derivative (PID) controller.
3. A system with transfer function
is of __________ order.
Options
A. zero
B. 1st
C. 2nd
D. 3rd
Show Answer
Scratch Pad
Discuss
Correct Answer: 1st
4. The thermal emf-temperature relationship of most thermocouples is
Options
A. linear
B. parabolic
C. exponential
D. square root
Show Answer
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Discuss
Correct Answer: parabolic
5. Change of angle of refraction with composition comprises the working principle of a
Options
A. polarimeter
B. polarograph
C. spectrometer
D. refractrometer
Show Answer
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Discuss
Correct Answer: refractrometer
6. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?
Options
A. Optical pyrometer
B. Radiation pyrometer
C. Photoelectric pyrometer
D. Thermocouples
Show Answer
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Discuss
Correct Answer: Thermocouples
7. Gain margin is equal to the
Options
A. amplitude ratio
B. reciprocal of amplitude ratio
C. gain in
P
controller
D. gain in
P
-
I
controller
Show Answer
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Discuss
Correct Answer: reciprocal of amplitude ratio
8. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively
Options
A. - 273° & 80°
B. 0° & 80°
C. 32° & 460°
D. 32° & 80°
Show Answer
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Correct Answer: 0° & 80°
9. Which of the following is not a composition measuring instrument?
Options
A. Thermal conductivity cell
B. Mass spectrometer
C. Polarograph
D. Hot wire anemometer
Show Answer
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Discuss
Correct Answer: Hot wire anemometer
10. A control system has the following transfer function
The initial value of the corresponding time function is
Options
A. 1
B. 1/8
C. 7/8
D. -1
Show Answer
Scratch Pad
Discuss
Correct Answer: 1
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