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Process Control and Instrumentation

Process Control and Instrumentation
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

-11.9
-80.9
-60.9
-38.9

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Process Control and Instrumentation
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.

Load
None of these
Manipulated
Controlled

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

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

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Process Control and Instrumentation
Stalagmometer is used for the measurement of

Kinematic viscosity
Refractive index
Surface tension
Optical activity

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

Pitot tube
Hot wire anemometer
Venturimeter
Rotameter

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Process Control and Instrumentation
The response of two tanks of same size and resistance in series is

None of these
Critically damped
Over damped
Under damped

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