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Process Control and Instrumentation

Process Control and Instrumentation
Photoelectric pyrometers are suitable in the temperature range of __________ °C.

800-1600
400-1000
800-2500
400-1600

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Process Control and Instrumentation
Thermocouple is suitable for measuring

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

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Process Control and Instrumentation
Dead zone is the

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

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Process Control and Instrumentation
Thermistors are made of

Iron-copper alloys
Ultra pure metals
Nickel-chromium alloys
Metal oxides

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Mercury
A metal powder or graphite
Air
Oil

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Platinum-platinum+rhodium
None of these
Aluminium-chromel
Copper-constantan

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