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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/3
π/12
π/6

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low thermal conductivity
Low flash point
Low electrical conductivity
High viscosity index

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Process Control and Instrumentation
Which of the following can not measure a temperature of 1600°C ?

Thermocouple
Radiation pyrometer
Platinum resistance thermometer
Photo-electric pyrometer

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Process Control and Instrumentation
Dead zone in an instrument must be less than __________ percent of the scale.

1.5
4
8
0.2

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Process Control and Instrumentation
E.m.f. generated by thermocouples is of the order of

Volts
Microvolts
Millivolts
Kilo volts

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Bourdon guage
Mcleoid gauge
Ionisation gauge
Alphatron

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