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Chemical Engineering
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Process Control and Instrumentation
Comments
Question
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
Correct Answer
P
-controller
Process Control and Instrumentation problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: first order system
2. __________ thermometer can not measure sub-zero (< 0° C) temperature,
Options
A. Mercury in glass
B. Bimetallic
C. Vapor pressure
D. Resistance
Show Answer
Scratch Pad
Discuss
Correct Answer: Bimetallic
3. The unit step response of the transfer function 1/(
s
2
+ 2
s
+ 3)
Options
A. has a non-zero slope at the origin.
B. has a damped oscillatory characteristics.
C. is overdamped
D. is unstable
Show Answer
Scratch Pad
Discuss
Correct Answer: has a damped oscillatory characteristics.
4. Paramagnetism method is not used for the composition determination of __________ in gases.
Options
A. oxygen
B. oxides of nitrogen
C. carbon dioxide
D. any of these
Show Answer
Scratch Pad
Discuss
Correct Answer: carbon dioxide
5. The amplitude ratio for the sinusoidal response of a __________ is 1.
Options
A. first order system
B. second order system
C. transportation lag
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: transportation lag
6. 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
Scratch Pad
Discuss
Correct Answer: differential pressure gage
7. Starting temperature of optical radiation pyrometer is __________ °C.
Options
A. 800
B. 400
C. 1200
D. 1500
Show Answer
Scratch Pad
Discuss
Correct Answer: 800
8. 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.
9. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 2.46 mv
10. 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
Scratch Pad
Discuss
Correct Answer: both (b) and (c).
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