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Process Control and Instrumentation

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

Bourdon guage
Mcleoid gauge
Alphatron
Ionisation gauge

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Process Control and Instrumentation
Positioning controllers are used for

High loads
Temperature changes
Low loads
Flow rate changes

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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.

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

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Process Control and Instrumentation
A system with transfer function (2S/4S) + 1 is of __________ order.

Zero
2nd
3rd
1st

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Process Control and Instrumentation
The closed loop pole of a stable second order system could be

Both real and negative
Both real and positive
Complex conjugate with positive real parts
One real positive and the other real negative

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Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

1/TS
R/TS
L(TS + l)
R/(TS + 1)

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