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Process Control and Instrumentation
Comments
Question
The calibration data of a thermocouple with its cold junction at 0°C are given below.
The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple?
Options
A. 3.26 mv
B. 0.80 mv
C. 2.46 mv
D. 2.43 mv
Correct Answer
2.46 mv
Process Control and Instrumentation problems
Search Results
1. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their
Options
A. low thermal conductivity.
B. low electrical conductivity.
C. high viscosity index.
D. low flash point.
Show Answer
Scratch Pad
Discuss
Correct Answer: low electrical conductivity.
2. Starting temperature of optical radiation pyrometer is __________ °C.
Options
A. 800
B. 400
C. 1200
D. 1500
Show Answer
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Discuss
Correct Answer: 800
3. Liquid argon level in a pressurised storage tank (at 3 kg/cm
2
) is measured by a/an
Options
A. gage glass
B. external float gage
C. differential pressure gage
D. none of these
Show Answer
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Discuss
Correct Answer: differential pressure gage
4. Which of the following controllers has maximum offset?
Options
A.
P
-controller
B.
P
-
I
controller
C.
P
-
D
controller
D.
P
-
I
-
D
controller
Show Answer
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Discuss
Correct Answer:
P
-controller
5. The amplitude ratio for the sinusoidal response of __________ is < 1.
Options
A. transportation lag
B. first order system
C. second order system
D. none of these
Show Answer
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Discuss
Correct Answer: first order system
6. Turbine flow meters are suitable for
Options
A. very limited flow ranges.
B. cryogenic flow measurements.
C. aerospace and in air borne applications.
D. both (b) and (c).
Show Answer
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Discuss
Correct Answer: both (b) and (c).
7. Which of the systems having the following transfer function is stable?
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
8. Use of
I
-control along with
P
-control facilitates
Options
A. elimination of offset
B. reduction of offset
C. reduction of stability time
D. none of these
Show Answer
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Discuss
Correct Answer: elimination of offset
9. The transfer function for a first order process with time delay is
Options
A.
B.
C.
D.
Show Answer
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Discuss
Correct Answer:
10. Liquid discharge from a tank or reservoir can not be measured by
Options
A. orificemeters
B. weirs
C. mouthpieces
D. notches
Show Answer
Scratch Pad
Discuss
Correct Answer: orificemeters
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