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Process Control and Instrumentation

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

25
100
75

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Process Control and Instrumentation
Strain gage pressure transducers are used to measure __________ pressures.

Absolute as well as differential
Gage as well as vacuum
Neither A nor B
Both A & B Here

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Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 + et
1 - et
1 + e-t
1 - e-t

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Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Coolant
Reactants
Product
None of these

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Process Control and Instrumentation
Which of the following is not the triple point of water?

32°F
492°R
273°K
32°R

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

45°
180°
0°
90°

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