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Process Control and Instrumentation

Process Control and Instrumentation
Characteristic equation is the denominator of __________ loop transfer function.

Closed
Both A & B Here
Open
Neither A Nor B Here

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Process Control and Instrumentation
Thermistors are made of

Ultra pure metals
Nickel-chromium alloys
Iron-copper alloys
Metal oxides

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Process Control and Instrumentation
Psychrometer determines the

Water of crystallisation
Moisture content of solids
Humidity of gases
Hygroscopic nature of solids

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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
2
43832

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Process Control and Instrumentation
Transfer function of transportation lag is

E-TS
None of these
1/(TS + 1)
ETS

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Vapor pressure thermometer
Platinum resistance thermometer
Radiation pyrometer
Mercury in glass thermometer

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