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Process Control and Instrumentation
Comments
Question
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°
Correct Answer
0° & 80°
Process Control and Instrumentation problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: reciprocal of amplitude ratio
2. 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
Scratch Pad
Discuss
Correct Answer: Thermocouples
3. Flame photometry is used for the determination of compositional analysis of
Options
A. solids
B. alkali metals
C. natural gas
D. isotopes
Show Answer
Scratch Pad
Discuss
Correct Answer: alkali metals
4. 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
)
5. 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
Scratch Pad
Discuss
Correct Answer: proportional integral-derivative (PID) controller.
6. 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
Scratch Pad
Discuss
Correct Answer: Hot wire anemometer
7. 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
8. Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
Options
A. - 39 and 350
B. - 51 and 439
C. - 79 and 395
D. - 10 and 425
Show Answer
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Discuss
Correct Answer: - 39 and 350
9. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?
Options
A. Platinum resistance thermometer
B. Mercury in glass thermometer
C. Vapor pressure thermometer
D. Radiation pyrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: Radiation pyrometer
10. Dome temperature of blast furnace stove is most accurately measured by a
Options
A. radiation pyrometer.
B. platinum-platinum/rhodium ther-mocuple.
C. iron-constantan thermocouple.
D. platinum resistance thermometer.
Show Answer
Scratch Pad
Discuss
Correct Answer: platinum-platinum/rhodium ther-mocuple.
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