Process Control and Instrumentation MCQs

Question 1

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?

Accepted Answer

Mercury

Answer

Water

Answer

Methyl alcohal

Answer

Carbon-tetrachloride

Question 2

Flapper nozzle is used in a/an __________ controller.

Accepted Answer

Pneumatic

Answer

Electronic

Answer

Hydraulic

Answer

None of these

Question 3

The temperature range for which copper resistance thermometer can be used is __________ °C

Accepted Answer

-200 to 150

Answer

0 to 150

Answer

350 to 750

Answer

500 to 900

Question 4

Gas chromatography is used for the measurement of

Accepted Answer

Concentration

Answer

Temperature

Answer

Pressure

Answer

Flow rate

Question 5

Which of the following thermocouples has the least temperature measurement range?

Accepted Answer

Copper-constantan

Answer

Chromel-alumel

Answer

Platinum-platinum/rhodium

Answer

Iron-constantan

Question 6

Emission spectroscopy is used for

Accepted Answer

Solids and metal analysis

Answer

Determining water purity

Answer

Determination of CO₂ in gases

Answer

NO x determination

Question 7

A barometer measures the __________ pressure.

Accepted Answer

Absolute

Answer

Gauge

Answer

Absolute as well as gauge

Answer

Dynamic

Question 8

Number of poles in a system with transfer function $$\frac{1}{{{{	ext{s}}^2} + 2{{	ext{s}}^2} + 1}}$$ is

Accepted Answer

3

Answer

2

Answer

5

Answer

1

Question 9

Feed forward controller accounts for the __________ changes.

Accepted Answer

Load

Answer

Set point

Answer

Both A & B

Answer

Neither A nor B