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Process Control and Instrumentation

Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

45°
90°
0°
180°

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Process Control and Instrumentation
Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

Gold
Antimony
Silver
Nickel

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Process Control and Instrumentation
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

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

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

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

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

0.1
3
13
29

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Process Control and Instrumentation
The operation of a rotameter is based on

Pressure at a stagnation point
Variable flow area
Pressure drop across a nozzle
Rotation of a turbine

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