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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following thermocouples can measure the maximum temperature?

Platinum-rhodium
Tungsten-molybdenum
Chromel-alumel
Iron-constantan

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Process Control and Instrumentation
Which of the following is not a second order instrument?

None of these
Mercury in glass thermometer with covering
Bare mercury in glass thermometer
Pressure gauge with one bellow, two tubes and a tank

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a primary element.

Bourdon tube
Pointer
None of these
Bulb

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Platinum-platinum+rhodium
Chromel-alumel
None of these
Iron-constantan

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

-10
-20
20
10

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

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

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