Process Control and Instrumentation - Chemical Engineering Questions and Answers

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Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

gage glass

external float gage

differential pressure gage

none of these

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Which of the systems having following transfer functions is stable?

1/(s²+ 2)

1/(s²-2s + 3)

1/(s² + 2s + 2)

exp(-20s)/(s² + 2s-l)

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What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?

0.5 AT

2 AT

1.5 AT

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The transfer function for a first order process with time delay is

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An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is

0.5/0.2

0.2/0.5

0.2 x 0.5

1/0.2 x 0.5

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The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

linear

non-linear

parabolic

hyperbolic

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Alphatron measures pressure __________ microns.

< 1

< 3

> 3

< 0.1

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What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?

< 1

none of these

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The unit step response of the transfer functionreaches its final steady state assymptotically after

a monotonic increase.

a monotonic decrease.

initially increasing and then decreasing.

increasing decreasing and then increasing.