Chemical Engineering · all questions

Process Control And Instrumentation
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Q1

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function

\frac{K ( s + 1 )}{2 ( 2 s + 1 ) ( 3 s + 1 )}

will have a definite number of loci for variation of K from 0 to

\infty

. The number of loci is

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Q2

Phase lag of the frequency response of a second order system to a sinusoidal forcing function

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Q3

Which of the following is not classified as a thermo electric pyrometer?

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Q4

The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

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Q5

__________ are analysed using a polarograph.

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Q6

__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'.

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Q7

Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

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Q8

Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

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Q9

Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

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Q10

Response of a linear control system for a change in set point is called

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Q11

The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

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Q12

Compositional analysis of __________ is done using mass spectrometer.

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Q13

The inverse Laplace transform of the function

f (s) = \frac{1}{S ( S + 1 )}

is

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Q14

Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

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Q15

Measurement of pressure in ammonia reactor is done by

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Q16

With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

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Q17

Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

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Q18

An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

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Q19

The open loop transfer function of a control system is

\frac{KR}{1 + TS} .

This represents

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Q20

A negative gain margin expressed in decibels means a/an __________ system.

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