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Process Control and Instrumentation

Process Control and Instrumentation
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.

50
10
100
1

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of __________ is < 1.

First order system
Transportation lag
None of these
Second order system

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Process Control and Instrumentation
Which of the following thermocouples has the least temperature measurement range?

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

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Process Control and Instrumentation
Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

Carbon monoxide in
Temperature of
Carbon dioxide in
Oxygen in

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Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

Increase
No change
Exponential decrease
Decrease

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Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D³
D²
D
D⁴

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