Process Control and Instrumentation MCQs

Question 1

For measuring the temperature of a red hot furnace, which is the most suitable instrument?

Accepted Answer

Optical pyrometer

Answer

Platinum resistance thermometer

Answer

Thermocouple

Answer

Bimetallic thermometer

Question 2

Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

Accepted Answer

Fidielity

Answer

Speed of response

Answer

Reproducibility

Answer

Static characteristics

Question 3

The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

Accepted Answer

Linear

Answer

Non-linear

Answer

Parabolic

Answer

Hyperbolic

Question 4

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

Accepted Answer

Pointer

Answer

Bourdon tube

Answer

Bulb

Answer

None of these

Question 5

The second order system with the transfer function $$\frac{4}{{{{	ext{s}}^2} + 2{	ext{s}} + 4}}$$ has a damping ratio of

Accepted Answer

0.5

Answer

2

Answer

1

Answer

4

Question 6

Routh test

Accepted Answer

Cannot be used to test the stability of a control system containing transportation lag

Answer

Criterion provides information about the actual location of roots

Answer

Criterion is not applicable to systems with polynomial characteristic equation

Answer

Can not determine as to how many roots of the characteristics equation have positive real roots

Question 7

Radiation pyrometers as compared to thermocouples

Accepted Answer

Can measure higher temperature

Answer

Has a slower speed of response

Answer

Can't measure the temperature of moving objects

Answer

Is more affected by corrosive atmosphere

Question 8

Hot wire anemometer is used for the measurement of

Accepted Answer

Flow rates of fluids

Answer

Flow rates of granular solids

Answer

Very high temperature

Answer

Thermal conductivity of gases

Question 9

__________ are analysed using a polarograph.

Accepted Answer

Solids

Answer

Isotonic solutions

Answer

Liquids

Answer

Gases