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Process Control and Instrumentation

Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

nRT/V
p/nRT
V/nRT
nRT/P

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Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

500
1000
250
750

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Process Control and Instrumentation
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

Parabolic
Non-linear
Linear
Hyperbolic

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

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

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

None of these
Elimination of offset
Reduction of stability time
Reduction of offset

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Process Control and Instrumentation
Platinum resistance thermometer is the international standard for temperature measurement between

Both A and B
Triple point of hydrogen and freezing point of antimony
13.81°K to 903.9°K
Neither A nor B

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