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Process Control and Instrumentation

Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Conductor
Insulator
Liquid semi-conductor
Solid semi-conductor

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Mercury
Methyl alcohal
Carbon-tetrachloride
Water

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Process Control and Instrumentation
A system with transfer function (2S/4S) + 1 is of __________ order.

2nd
1st
Zero
3rd

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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
1064.43
630.74
961.93

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

20
10
-10
-20

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Very high temperatures only
Both high and low temperatures
Liquid temperatures only
Very low temperatures only

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