Process Control and Instrumentation MCQs

Question 1

Which of the following is not a second order instrument?

Accepted Answer

Bare mercury in glass thermometer

Answer

Mercury in glass thermometer with covering

Answer

Pressure gauge with one bellow, two tubes and a tank

Answer

None of these

Question 2

High temperature of around 2000°C of incandescent gas mantles is measured by a/an

Accepted Answer

Radiation pyrometer

Answer

Specially designed thermocouple

Answer

Optical pyrometer

Answer

None of these

Question 3

Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Accepted Answer

Chromel-alumel

Answer

Iron-constantan

Answer

Platinum-platinum+rhodium

Answer

None of these

Question 4

Flow rate through an orifice is __________ the pressure differential.

Accepted Answer

Proportional to the square root of

Answer

Proportional to

Answer

Inversely proportional to the square root of

Answer

Inversely proportional to the square of

Question 5

Pyrometry refers to the measurement of temperature

Accepted Answer

Which is of higher magnitude

Answer

With the mercurial thermometer upto 350°C

Answer

Directly

Answer

All of the above

Question 6

Which of the following is not a speed measuring instrument?

Accepted Answer

Psychrometer

Answer

Stroboscope

Answer

Tachometer

Answer

All of the above

Question 7

__________ controller has the maximum stabilising time.

Accepted Answer

PI

Answer

P

Answer

PD

Answer

PID

Question 8

A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Accepted Answer

Helium

Answer

Hydrogen

Answer

Nitrogen

Answer

None of these

Question 9

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

Accepted Answer

Bulb

Answer

Pointer

Answer

Bourdon tube

Answer

None of these