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Process Control and Instrumentation
Comments
Question
Pressure of 0.0001 absolute psi can be measured by __________ gauge.
Options
A. Mcloid
B. Pirani
C. thermocouple
D. none of these
Correct Answer
Mcloid
Process Control and Instrumentation problems
Search Results
1. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
Options
A. large area but small mass.
B. high thermal conductivity.
C. small specific heat.
D. all'a', 'b' & 'c'.
Show Answer
Scratch Pad
Discuss
Correct Answer: all'a', 'b' & 'c'.
2. Pressure of 0.01 psi (absolute) can be measured by __________ gauge.
Options
A. ionisation
B. Pirani
C. Mcloid
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: Mcloid
3. On-off controllers are normally used for
Options
A. low loads
B. temperature changes
C. flow rate changes
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: low loads
4. Which of the following is a 'contact' pyrometer?
Options
A. resistance pyrometer
B. optical pyrometer
C. radiation pyrometer
D. infra red pyrometer
Show Answer
Scratch Pad
Discuss
Correct Answer: resistance pyrometer
5. What is the dynamic error in a critically damped second order instrument for a ramp input (At)?
Options
A. 0.5 AT
B. 2 AT
C.
AT
D. 1.5 AT
Show Answer
Scratch Pad
Discuss
Correct Answer: 2 AT
6. For the block diagram shown below :
The characteristic equation is
Options
A. ?
l
S
(?
p
s
+ 1) +
K
c
.
K
p
(?
l
S
+ 1) e
-?
d
s
= 0
B. (?
m
S
+ 1) (?
p
S
+ 1) +
K
m
.
K
p
e
-?
d
S
= 0
C. ?
l
S
(?
m
S
+ 1) (?
p
S
+ 1) +
K
c
.
K
p
.
K
m
(?
l
s
+ 1) e
-?
d
S
= 0
D. (?
m
s
+ 1) (?
p
s
+ 1) +
K
c
.
K
p
.
K
m
. e
-?
d
S
= 0
Show Answer
Scratch Pad
Discuss
Correct Answer: ?
l
S
(?
m
S
+ 1) (?
p
S
+ 1) +
K
c
.
K
p
.
K
m
(?
l
s
+ 1) e
-?
d
S
= 0
7. An ideal PID controller has the transfer function
. The frequency at which the magnitude ratio of the controller is 1, is
Options
A. 0.5/0.2
B. 0.2/0.5
C. 0.2 x 0.5
D. 1/
0.2 x 0.5
Show Answer
Scratch Pad
Discuss
Correct Answer: 1/
0.2 x 0.5
8. Continuous measurement of moisture in paper is done by
Options
A. sling psychrometer.
B. hair-hygrometer.
C. weighing.
D. high resistance Wheatstone's bridge circuit.
Show Answer
Scratch Pad
Discuss
Correct Answer: high resistance Wheatstone's bridge circuit.
9. The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.
Options
A. pressure
B. volume
C. viscosity
D. all (a), (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c)
10. The response of two tanks of same size and resistance in series is
Options
A. under damped
B. critically damped
C. over damped
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: critically damped
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