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Process Control and Instrumentation

Process Control and Instrumentation
Which of the systems having following transfer functions is stable?

1/(s²-2s + 3)
1/(s² + 2s + 2)
1/(s²+ 2)
Exp(-20s)/(s² + 2s-l)

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Thomson effect
Joule heating effect
Peltier effect
Seebeck effect

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Process Control and Instrumentation
Which of the following can not measure a temperature of 1600°C ?

Platinum resistance thermometer
Radiation pyrometer
Photo-electric pyrometer
Thermocouple

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

None of these
Transportation lag
Second order system
First order system

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

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

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Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Bellows
U-tube
Diaphragm
Bourdon tube

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