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Process Control and Instrumentation
Comments
Question
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
Correct Answer
Mercury thermometer
Process Control and Instrumentation problems
Search Results
1. 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
2. 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
3. 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
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Discuss
Correct Answer: controlled
4. Hot wire anemometer is used for the measurement of
Options
A. flow rates of fluids.
B. flow rates of granular solids.
C. very high temperature.
D. thermal conductivity of gases.
Show Answer
Scratch Pad
Discuss
Correct Answer: flow rates of fluids.
5. Bourdon tube is never made of
Options
A. phosphor bronze
B. monel metal
C. stainless steel
D. cast iron
Show Answer
Scratch Pad
Discuss
Correct Answer: cast iron
6. 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.
7. Meleoid gauge measures the __________ pressure.
Options
A. positive
B. sub-atmospheric
C. very high
D. atmospheric
Show Answer
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Discuss
Correct Answer: sub-atmospheric
8. 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
9. 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
10. 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
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