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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

None of these
Temperature changes
Flow rate changes
Low loads

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Process Control and Instrumentation
__________ type of element is normally not used in the bimetallic thermometers.

Bourdon tube
Flat spiral
Multiple helix
Single helix

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc(1+τD s)
Kc τD s
Kc(1 +1/τD s)
Kc/τD s

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

1/S²
1/(S² + 1)
1
1/S

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Process Control and Instrumentation
Starting temperature of optical radiation pyrometer is __________ °C.

400
1500
800
1200

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Process Control and Instrumentation
Which of the following flow-metering instru-ments is an areameter?

Rotameter
Venturimeter
Pitot tube
Hot wire anemometer

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