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Process Control and Instrumentation

Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1/S²
1/(S² + 1)
1/S
1

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Process Control and Instrumentation
Turbine flow meters are suitable for

Aerospace and in air borne applications
Cryogenic flow measurements
Both B and C
Very limited flow ranges

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

Ionisation gauge
Alphatron
Bourdon guage
Mcleoid gauge

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 79 and 395
- 10 and 425
- 51 and 439
- 39 and 350

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Process Control and Instrumentation
Which of the following is an undesirable dynamic characteristic of an instrument?

Time lag
Reproducibility
Dead zone
Static error

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Iron-constantan
Chromel-alumel
None of these
Platinum-platinum+rhodium

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