PROCESS CONTROL AND INSTRUMENTATION QUIZ

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/6

π/12

π/3

5π/12

TRUE ANSWER : ?
YOUR ANSWER : ?

A negative gain margin expressed in decibels means a/an __________ system.

Unstable

None of these

Critically damped

Stable

TRUE ANSWER : ?
YOUR ANSWER : ?

Positioning controllers are used for

High loads

Flow rate changes

Temperature changes

Low loads

TRUE ANSWER : ?
YOUR ANSWER : ?

Emission spectroscopy is used for

Solids and metal analysis

Determining water purity

Determination of CO₂ in gases

NOxdetermination

TRUE ANSWER : ?
YOUR ANSWER : ?

Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

p/nRT

nRT/V

nRT/P

V/nRT

TRUE ANSWER : ?
YOUR ANSWER : ?

Stability of a control system containing a transportation lag can be best analysed by

None of these

Root locus methods

Frequency response methods

Routh test

TRUE ANSWER : ?
YOUR ANSWER : ?

Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

None of these

Radiation

Photoelectric

Optical

TRUE ANSWER : ?
YOUR ANSWER : ?

The transfer function of a first order system is

1/(Ts + 1)

None of these

S/(Ts + 1)

1/Ts

TRUE ANSWER : ?
YOUR ANSWER : ?

Change of angle of refraction with composition comprises the working principle of a

Spectrometer

Polarimeter

Refractrometer

Polarograph

TRUE ANSWER : ?
YOUR ANSWER : ?

A pyrheliometer is an instrument used for measuring the

Beam radiation

None of these

Diffuse radiation

Bright sunshine period

TRUE ANSWER : ?
YOUR ANSWER : ?

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