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Process Control and Instrumentation

Process Control and Instrumentation
Composition of alloys can be determined by

Refractrometer
Chromatograph
None of these
Polarograph

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Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

< 1.7 and > 30°
< 1.7 and < 30°
> 1.7 and < 30°
> 1.7 and > 30°

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

700
550
350
250

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Process Control and Instrumentation
For an input forcing function, X(t) = 2t², the Laplace transform of this function is

2/s²
4/s³
2/s³
4/s²

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

RC
R - C
R + C
1/RC

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

Rotameter
Hot wire anemometer
Pitot tube
Venturimeter

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