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Process Control and Instrumentation

Process Control and Instrumentation
For measuring the temperature of a red hot furnace, which is the most suitable instrument?

Thermocouple
Optical pyrometer
Platinum resistance thermometer
Bimetallic thermometer

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

1
2
3
5

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Process Control and Instrumentation
If response of a control system is to be free of offset and oscillation, the most suitable controller is

Proportional-derivative(PD)controller
Proportional controller
Proportional integral-derivative (PID) controller
Proportional-integral (PI) controller

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Process Control and Instrumentation
Measurement of pressure in ammonia reactor is done by

Bourdon gauge
U-tube manometer
Pirani guage
Inclined tube manometer

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

Large area but small mass
High thermal conductivity
All of these
Small specific heat

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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

D⁴
D³
D
D²

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