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Process Control and Instrumentation
Comments
Question
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.
Correct Answer
flow rates of fluids.
Process Control and Instrumentation problems
Search Results
1. 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
2. In a feed-back control system
G
and
H
denote open loop and close loop transfer functions respectively. The output-input relationship is
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
3. A stable system is the one
Options
A. for which the output response is bounded for all bounded input.
B. which exhibits an unbounded response to a bounded input
C. which satisfies the conditions for a servo problem.
D. none of these.
Show Answer
Scratch Pad
Discuss
Correct Answer: for which the output response is bounded for all bounded input.
4. The pressure sensing element of elastic type pressure gauge is never made in the form of a
Options
A. bellow
B. diaphragm
C. strip
D. Bourdon tube
Show Answer
Scratch Pad
Discuss
Correct Answer: strip
5. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
Options
A. the function is exponential.
B. the Laplace transform of integral of exp(at) has finite values only for s > a.
C. the Laplace transform integral of exp(at) has initial values only for s > a.
D. the function exp(at) is piece-wise continuous only for s > a.
Show Answer
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Discuss
Correct Answer: the Laplace transform of integral of exp(at) has finite values only for s > a.
6. 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
7. 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
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Discuss
Correct Answer:
w
=
7/6
,
K
c
= 46/3
8. 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
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Discuss
Correct Answer: servo problem
9. 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
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Discuss
Correct Answer: Mercury thermometer
10. 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
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Discuss
Correct Answer: more than one feed-back loop.
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