Process Control and Instrumentation MCQs

Question 1

Response of a system to a sinusoidal input is called __________ response.

Accepted Answer

Frequency

Answer

Impluse

Answer

Unit step

Answer

None of these

Question 2

The inverse Laplace transform of the function $${	ext{f}}\left( {	ext{s}} ight) = \frac{1}{{{	ext{S}}\left( {{	ext{S}} + 1} ight)}}$$ is

Accepted Answer

1 - e -t

Answer

1 + e t

Answer

1 - e t

Answer

1 + e -t

Question 3

Silver point temperature is __________ °C.

Accepted Answer

960.5

Answer

760.5

Answer

860.5

Answer

1060.5

Question 4

Which of the following is not a composition measuring instrument?

Accepted Answer

Hot wire anemometer

Answer

Thermal conductivity cell

Answer

Mass spectrometer

Answer

Polarograph

Question 5

Which of the following thermocouples is capable of measuring a temperature of -50°C?

Accepted Answer

Platinum - platinum + rhodium

Answer

Chromel - alumel

Answer

Iron-constantan

Answer

Copper - constantan

Question 6

The closed loop pole of a stable second order system could be

Accepted Answer

Both real and positive

Answer

Complex conjugate with positive real parts

Answer

Both real and negative

Answer

One real positive and the other real negative

Question 7

Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Accepted Answer

Vycor (a glass)

Answer

Steel

Answer

Nichrome

Answer

Inconel

Question 8

Paramagnetism method is not used for the composition determination of __________ in gases.

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Oxides of nitrogen

Answer

Any of these

Question 9

Which of the following judges the accuracy of an instrument?

Accepted Answer

Static error

Answer

Dead zone

Answer

Drift

Answer

None of these