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Process Control and Instrumentation

Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 51 and 439
- 39 and 350
- 79 and 395
- 10 and 425

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Process Control and Instrumentation
Gain margin is equal to the

Gain in P controller
Reciprocal of amplitude ratio
Amplitude ratio
Gain in P-I controller

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Process Control and Instrumentation
Turbine flow meters are suitable for

Aerospace and in air borne applications
Very limited flow ranges
Both B and C
Cryogenic flow measurements

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Process Control and Instrumentation
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

Mcloid
Ionisation
None of these
Pirani

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Process Control and Instrumentation
Thermistors are made of

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

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Process Control and Instrumentation
Which of the following thermocouples has the least temperature measurement range?

Iron-constantan
Chromel-alumel
Copper-constantan
Platinum-platinum/rhodium

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