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84.

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91.

Flame ionisation detector in the gas chromatography is used for the detection of
A) Nitrogen B) Helium C) Sulphur D) Hydrocarbons

If the reading of pH meter changes from 7 to 9, the hydrogen ion concentration of
the solution is

A) Will get halved B) Will get doubled
C) Increases 100 times D) Decreases 100 times

Bolometer measures
A) Air pressure B) Intensity of electromagnetic radiation
C) Fluid velocity D) Specific gravity of liquids

The purpose of the reference electrode in a pH meter is to deliver
A) Aconstant current 8) A constant voltage
C) Temperature compensation D) Both B) and C)

Telemetry system which normally uses self balancing potentiometer at the
receiving end

A) Voltage telemetry system B) Current telemetry system
C) Frequency telemetry system D) Impulse telemetry system

In time division multiplexing

A) Entire bandwidth of the channel is dedicated to one speed channel for a short
period of time

B) Divides a higher bandwidth channel into many individual smaller bandwidth
channel

C) Groups many individual channels to form channel with much higher bandwidth
D) None of these

Recorder which records the relationship between two variables
A) Graphic recorder B) Strip chart recorder
C) Multipoint recorder D) X-Y recorder

The signal selected by a multiplexer is converted into a constant voltage by
A) Voltage doubler B) Filter
C) Sample and hold circuit D) Voltage regulator

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