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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
75
100

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

Reactants
Product
None of these
Coolant

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Process Control and Instrumentation
A barometer measures the __________ pressure.

Gauge
Absolute
Dynamic
Absolute as well as gauge

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Process Control and Instrumentation
Which of the following is not a variable area flow meter?

Rotameter
Orifice and tapered plug meter
Piston type meter
Magnetic flow meter

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = 1/√14, Kc = 45/7√14
W = √(7/6), Kc = 46/3
W = 1, Kc = 13
W = √(7/8), Kc = 45/4

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

None of these
Routh test
Frequency response methods
Root locus methods

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