Process Control and Instrumentation MCQs

Question 1

Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

Accepted Answer

Bimetallic thermometer

Answer

Mercury thermometer

Answer

Radiation pyrometer

Answer

None of these

Question 2

A mercury barometer measures the __________ pressure.

Accepted Answer

Atmospheric

Answer

Gauge

Answer

Vacuum

Answer

Absolute

Question 3

Gain margin is equal to the

Accepted Answer

Reciprocal of amplitude ratio

Answer

Amplitude ratio

Answer

Gain in P controller

Answer

Gain in P-I controller

Question 4

Process degree of freedom indicates __________ number of controllers to be used.

Accepted Answer

The maximum

Answer

The minimum

Answer

Both maximum and the minimum

Answer

Nothing about the

Question 5

In a second order under damped system, the

Accepted Answer

Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e

Answer

Time required for the response of first reach its ultimate value is called the response time

Answer

Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot

Answer

None of these

Question 6

Presence of a small amount of water in the organic systems can be determined by the __________ method.

Accepted Answer

Dielectric constant end loss factor

Answer

Electrical conductivity

Answer

Polarimetry

Answer

Emission spectroscopy

Question 7

Dilatometer is used to measure

Accepted Answer

Contraction/expansion due to changes in temperature

Answer

Stress

Answer

Strain

Answer

Deflection

Question 8

The __________ of a vapor pressure thermometer is a secondary element.

Accepted Answer

Bourdon tube

Answer

Pointer

Answer

Bulb

Answer

None ofthese

Question 9

Which of the following can measure temperatures in the range of - 20 to 300°C ?

Accepted Answer

None of these

Answer

Mercury in glass thermometer

Answer

Vapor pressure thermometer

Answer

Resistance thermometer