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Process Control and Instrumentation

Process Control and Instrumentation
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is

2
1
43832

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Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Of hot junction only
Of cold junction only
Difference between cold junction and atmospheric temperature
Difference between hot and cold junctions

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Process Control and Instrumentation
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

Voltage
Current
Flux density
Light intensity

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Process Control and Instrumentation
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

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

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Process Control and Instrumentation
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?

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

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Process Control and Instrumentation
Flapper nozzle is used in a/an __________ controller.

Electronic
Pneumatic
Hydraulic
None of these

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