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Process Control and Instrumentation

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

12
68
36
54

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

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Process Control and Instrumentation
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

Helium
Nitrogen
Hydrogen
None of these

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Process Control and Instrumentation
Starting temperature of optical radiation pyrometer is __________ °C.

800
1500
400
1200

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Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-D controller
P-controller
P-I controller
P-I-D controller

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Vapor pressure thermometer
Radiation pyrometer
Mercury in glass thermometer
Platinum resistance thermometer

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