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Process Control and Instrumentation

Process Control and Instrumentation
The pressure sensing element of elastic type pressure gauge is never made in the form of a

Diaphragm
Bourdon tube
Strip
Bellow

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Process Control and Instrumentation
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

Seebeck effect
Thomson effect
None of these
Peltier effect

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Process Control and Instrumentation
Non-metallic diaphragm used as pressure sensor in instruments is generally made of

Thick paper
Teflon
Synthetic rubber
Bakelite

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Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

No change
Decrease
Increase
Exponential decrease

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

1/S
1/(S² + 1)
1/S²
1

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 120°
Is 30°
Is 90° at the most
Approaches 180° asymptotically

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