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Process Control and Instrumentation

Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

5π/12
π/6
π/3
π/12

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Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Helium
None of these
Hydrogen
Nitrogen

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Pressure
Volume
Viscosity
All of these

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Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Hydrometer
Both A and C
Contact-type electric indicators
Displacement meter

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Process Control and Instrumentation
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

Nitrogen in steel thermometer
Mercury in glass thermometer
Fused metal (Na or K) in steel thermometer
Alcohol in glass thermometer

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Process Control and Instrumentation
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

Water
Paraffin
Carbon tetrachloride
Ethylene glycol

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