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Process Control and Instrumentation

Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

0° & 80°
- 273° & 80°
32° & 80°
32° & 460°

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H/G
G/(1 + H)
H(1 + G)
G/H

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Process Control and Instrumentation
Liquid flow rate in an open channel can not be measured by a/an

Orifice meter
Rectangular weir
Cipolletti weir
V-notch

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Process Control and Instrumentation
If response of a control system is to be free of offset and oscillation, the most suitable controller is

Proportional-derivative(PD)controller
Proportional integral-derivative (PID) controller
Proportional controller
Proportional-integral (PI) controller

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Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

54
36
12
68

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Process Control and Instrumentation
A stable system is the one

Which exhibits an unbounded response to a bounded input
None of these
Which satisfies the conditions for a servo problem
For which the output response is bounded for all bounded input

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