Process Control and Instrumentation MCQs

Question 1

Bode stability method uses __________ loop transfer function.

Accepted Answer

Open

Answer

Closed

Answer

Either A or B

Answer

Neither A nor B

Question 2

Working principle of disappearing filament type optical pyrometer is based on the

Accepted Answer

Wien's law

Answer

Seebeck effect

Answer

Kirchoff's law

Answer

Peltier effect

Question 3

Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

Accepted Answer

Gold

Answer

Antimony

Answer

Silver

Answer

Nickel

Question 4

Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

Accepted Answer

Alcohol in glass thermometer

Answer

Mercury in glass thermometer

Answer

Mercury in steel thermometer

Answer

Fused metal (Na or K) in steel thermometer

Question 5

Stroboscope is used for the measurement of

Accepted Answer

Rpm of a flywheel

Answer

Frequency of light

Answer

Depression of freezing point

Answer

Liquid level under pressure

Question 6

Liquid levels in autocalves are measued by

Accepted Answer

Differential float type manometer

Answer

Simple float

Answer

Glass gauge

Answer

None of these

Question 7

The operation of a rotameter is based on

Accepted Answer

Variable flow area

Answer

Rotation of a turbine

Answer

Pressure drop across a nozzle

Answer

Pressure at a stagnation point

Question 8

__________ type of element is normally not used in the bimetallic thermometers.

Accepted Answer

Bourdon tube

Answer

Flat spiral

Answer

Single helix

Answer

Multiple helix

Question 9

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

Accepted Answer

Platinum-platinum/rhodium

Answer

Iron-constantan

Answer

Chromel-alumel

Answer

Copper-constantan