PROCESS CONTROL AND INSTRUMENTATION QUIZ

Which of the following judges the accuracy of an instrument?

None of these

Static error

Drift

Dead zone

TRUE ANSWER : ?
YOUR ANSWER : ?

Bourdon tube is never made of

Monel metal

Phosphor bronze

Cast iron

Stainless steel

TRUE ANSWER : ?
YOUR ANSWER : ?

Liquid discharge from a tank or reservoir can not be measured by

Notches

Orificemeters

Weirs

Mouthpieces

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermistors are used in __________ devices.

Voltage measuring

Temperature measuring

Temperature compensating

Both B & C

TRUE ANSWER : ?
YOUR ANSWER : ?

The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/12

5π/12

π/6

π/3

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the one which is a first order instrument.

Bare metallic thermometer

Mercury in glass thermometer (without any covering or air gap)

Bare vapor pressure thermometer

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 90° at the most

Is 30°

Is 120°

Approaches 180° asymptotically

TRUE ANSWER : ?
YOUR ANSWER : ?

The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system

Is the same for set point or load changes

Determines its stability

Depends only upon the open loop transfer function

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Platinum-platinum/rhodium

Copper-constantan

Iron-constantan

Chromel-alumel

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following thermometers is not suitable for distant reading upto 60 metres?

Constant volume gas thermometer

Resistance thermometer

Mercury in glass thermometer

Vapor pressure thermometer

TRUE ANSWER : ?
YOUR ANSWER : ?

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