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Process Control and Instrumentation

Process Control and Instrumentation
A pyranometer is an instrument used for measuring the

Beam radiation
Global radiation
None of these
Bright sunshine period

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Is a constant
Grows linearly with time
Decays linearly with time
Grows exponentially with time

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Proportional to
Inversely proportional to the square of
Inversely proportional to the square root of
Proportional to the square root of

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Process Control and Instrumentation
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is

1
43832
2

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Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

√AT
0.5 AT
2 AT
1.5 AT

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

75
25
100

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