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Process Control and Instrumentation

Process Control and Instrumentation
The term analogous to the electrical current in a thermal system is the

None of these
Heat flow rate
Temperature difference
Heat content in the system

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Process Control and Instrumentation
Optical activity of a solution can be determined using a

Polarimeter
Refractrometer
Dilatometer
Polarograph

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Process Control and Instrumentation
Thermistors are used in __________ devices.

Temperature compensating
Both B & C
Voltage measuring
Temperature measuring

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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

90°
180°
45°
0°

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

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

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Process Control and Instrumentation
Pirani gauge is used for the measurement of

Liquid level at atmospheric pressure
Very high pressure
Liquid level under pressure
High vacuum

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