PROCESS CONTROL AND INSTRUMENTATION QUIZ

pH meter has

Three cells

One cell

No cell

Two cells

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ is undesirable in thermocouples used in industries,

Non-linear relation of emf to temperature

Linear relation of emf to temperature

Corrosion resistance

Oxidation resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

Mcleoid gauge is used to measure the

Pressure

Point velocity

Flow rate

Vacuum

TRUE ANSWER : ?
YOUR ANSWER : ?

A non-linear system will have __________ steady state values.

More than one

Three

Two

One

TRUE ANSWER : ?
YOUR ANSWER : ?

The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

None of these

Under damped

Over damped

Critically damped

TRUE ANSWER : ?
YOUR ANSWER : ?

The transfer function for a P-D controller is

Kc τD s

Kc(1 +1/τD s)

Kc/τD s

Kc(1+τD s)

TRUE ANSWER : ?
YOUR ANSWER : ?

Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Methyl alcohal

Carbon-tetrachloride

Water

Mercury

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermistors are made of

Nickel-chromium alloys

Iron-copper alloys

Metal oxides

Ultra pure metals

TRUE ANSWER : ?
YOUR ANSWER : ?

A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

Current

Voltage

Light intensity

Flux density

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a desirable characteristic of an instrument?

High drift

High fidelity

High measuring lag

Poor reproducibility

TRUE ANSWER : ?
YOUR ANSWER : ?

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