Process Control and Instrumentation MCQs

Question 1

Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

Accepted Answer

Magnetic flowmeter

Answer

Pitot tube

Answer

Flow nozzle type flowmeter

Answer

Turbine flowmeter

Question 2

Bode diagram is a plot of

Accepted Answer

Log (AR) vs. log (f) and (Φ) vs. log (f)

Answer

Log (AR) vs. f and log Φ vs.f

Answer

AR vs. log (f) and Φ vs. log (f)

Answer

None of these

Question 3

Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Accepted Answer

Brass

Answer

Nickel

Answer

Chromel

Answer

Invar

Question 4

__________ is an example of distributed parameter system

Accepted Answer

Tubular reactor

Answer

CSTR

Answer

On-off controller

Answer

None of these

Question 5

Which of the following is not classified as a thermo electric pyrometer?

Accepted Answer

Optical pyrometer (disappearing filament type)

Answer

Resistance thermometer

Answer

Thermocouple

Answer

Radiation pyrometer

Question 6

Positioning controllers are used for

Accepted Answer

High loads

Answer

Low loads

Answer

Temperature changes

Answer

Flow rate changes

Question 7

Which is the most suitable instrument for measuring pressure below 3 microns?

Accepted Answer

Ionisation gauge

Answer

Mcleoid gauge

Answer

Alphatron

Answer

Bourdon guage

Question 8

What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

Accepted Answer

2 AT

Answer

0.5 AT

Answer

$$\sqrt {{	ext{AT}}} $$

Answer

1.5 AT

Question 9

Mercury manometer (U-tube type) exemplifies a __________ order system.

Accepted Answer

Second

Answer

Zero

Answer

First

Answer

Third