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Process Control and Instrumentation
Comments
Question
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.
Correct Answer
for which the output response is bounded for all bounded input.
Process Control and Instrumentation problems
Search Results
1. 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
2. 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
Scratch Pad
Discuss
Correct Answer: the Laplace transform of integral of exp(at) has finite values only for s > a.
3. Photoelectric pyrometers are suitable in the temperature range of __________ °C.
Options
A. 400-1600
B. 800-1600
C. 800-2500
D. 400-1000
Show Answer
Scratch Pad
Discuss
Correct Answer: 800-1600
4. Which of the following thermocouples is capable of measuring a temperature of -50°C?
Options
A. Platinum - platinum + rhodium
B. Chromel - alumel
C. Iron-constantan
D. Copper - constantan
Show Answer
Scratch Pad
Discuss
Correct Answer: Platinum - platinum + rhodium
5. A non-linear system will have __________ steady state values.
Options
A. one
B. more than one
C. two
D. three
Show Answer
Scratch Pad
Discuss
Correct Answer: more than one
6. 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:
7. 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
8. 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.
9. 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
10. 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
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