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Process Control and Instrumentation

Process Control and Instrumentation
A pyranometer is an instrument used for measuring the

Bright sunshine period
None of these
Global radiation
Beam radiation

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Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Gauge
Vacuum
Absolute
Atmospheric

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Process Control and Instrumentation
Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

Differential pressure gage
External float gage
Gage glass
None of these

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

G/H
H(1 + G)
G/(1 + H)
H/G

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Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Thermocouples
Gas thermometers
Resistance thermometers
Bi-metallic thermometers

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

100
25
75

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