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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

0°
45°
180°
90°

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Process Control and Instrumentation
Liquid discharge from a tank or reservoir can not be measured by

Orificemeters
Mouthpieces
Notches
Weirs

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Process Control and Instrumentation
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

Orificemeter
Venturimeter
Hot wire anemometer
Magnetic flow meter

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Process Control and Instrumentation
Bourdon tube is never made of

Cast iron
Monel metal
Stainless steel
Phosphor bronze

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Process Control and Instrumentation
Pressure of 0.0001 absolute psi can be measured by __________ gauge

Thermocouple
Mcloid
Pirani
None of these

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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

Oil
Air
A metal powder or graphite
Mercury

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