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Chemical Engineering
‣
Process Control and Instrumentation
Comments
Question
Meleoid gauge measures the __________ pressure.
Options
A. positive
B. sub-atmospheric
C. very high
D. atmospheric
Correct Answer
sub-atmospheric
Process Control and Instrumentation problems
Search Results
1. Cascade control means
Options
A. feed forward control.
B. more than one feed-back loop.
C. on-off control.
D. one feed-back loop.
Show Answer
Scratch Pad
Discuss
Correct Answer: more than one feed-back loop.
2. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?
Options
A. Mercury thermometer
B. Radiation pyrometer
C. Bimetallic thermometer
D. Thermocouple
Show Answer
Scratch Pad
Discuss
Correct Answer: Mercury thermometer
3. Response of a linear control system for a change in set point is called
Options
A. frequency response
B. transient response
C. servo problem
D. regulator problem
Show Answer
Scratch Pad
Discuss
Correct Answer: servo problem
4. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function
G
p
(
s
) = 1/(4
s
+ 1)(2
s
+ 1)(
s
+ 1).
Options
A.
w
= 1/
14
,
K
c
= 45/7
14
B.
w
=
7/6
,
K
c
= 46/3
C.
w
= 1,
K
c
= 13
D.
w
=
7/8
,
K
c
= 45/4
Show Answer
Scratch Pad
Discuss
Correct Answer:
w
=
7/6
,
K
c
= 46/3
5. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.
Options
A. load
B. manipulated
C. controlled
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: controlled
6. Phase margin is equal to
Options
A. 180° - phase lag
B. phase lag - 180°
C. phase lag + 180°
D. phase lag + 90°
Show Answer
Scratch Pad
Discuss
Correct Answer: 180° - phase lag
7. Maximum differential pressure in liquid manometer is __________ psi.
Options
A. 20
B. 30
C. 40
D. 50
Show Answer
Scratch Pad
Discuss
Correct Answer: 30
8. What is the Laplace transform of impulse input having magnitude '
X
'?
Options
A.
X
B.
X
2
C. 1/
X
D. 1
Show Answer
Scratch Pad
Discuss
Correct Answer: 1
9. Which of the following is not classified as a thermo electric pyrometer?
Options
A. Resistance thermometer.
B. Thermocouple.
C. Optical pyrometer (disappearing filament type)
D. Radiation pyrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: Optical pyrometer (disappearing filament type)
10. Liquid flow rate in an open channel can not be measured by a/an
Options
A. orifice meter
B. cipolletti weir
C. rectangular weir
D. V-notch
Show Answer
Scratch Pad
Discuss
Correct Answer: orifice meter
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