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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Lead
Nickel
Copper
30% iron + 70% nickel

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

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

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Process Control and Instrumentation
A bolometer is

Both A & B Here
An element which senses optical input and delivers thermal output
Neither A nor B Here
Used for the measurement of thermal radiation

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Process Control and Instrumentation
Characteristic equation is the denominator of __________ loop transfer function.

Both A & B Here
Neither A Nor B Here
Open
Closed

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Process Control and Instrumentation
Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.

1261.93
630.74
1064.43
961.93

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Non-linear relation of emf to temperature
Corrosion resistance
Oxidation resistance
Linear relation of emf to temperature

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