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Process Control and Instrumentation

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
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Mercury thermometer
Bimetallic thermometer
Thermocouple
Radiation pyrometer

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Process Control and Instrumentation
Bimetal strips are not used in

Bimetallic thermometers
Thermostats
Relays for opening & closing of electrical circuits
Thermocouples

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Process Control and Instrumentation
Dead zone is the

None of these
Same as time constant
Same as transportation lag
Maximum change in the variable that does not change the reading of the instrument

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Process Control and Instrumentation
Bourdon tube is never made of

Phosphor bronze
Monel metal
Cast iron
Stainless steel

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Process Control and Instrumentation
Measurement of pressure in ammonia reactor is done by

U-tube manometer
Pirani guage
Inclined tube manometer
Bourdon gauge

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