Process Control And Instrumentation(Chemical Engineering ) Questions and answers for exam Preparation

Question 1. Polarograph is meant for the analysis of

Gaseous mixture
Miscible liquids
Solids
Isotopes

Explanation:-

Answer: Option C. -> Solids

Question 2. Which of the following judges the accuracy of an instrument?

Dead zone
Drift
Static error
None of these

Explanation:-

Answer: Option C. -> Static error

Question 3. Typical specifications for design stipulates the gain margin and phase margin to be respectively

> 1.7 and > 30°
< 1.7 and > 30°
< 1.7 and < 30°
> 1.7 and < 30°

Explanation:-

Answer: Option A. -> > 1.7 and > 30°

Question 4. In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.

Load
Manipulated
Controlled
None of these

Explanation:-

Answer: Option A. -> Load

Question 5. 0n-off control which is a special case of proportional control, has a band width of about __________ percent.

100
75
25
0

Explanation:-

Answer: Option D. -> 0

Question 6. An aneroid barometer measures the __________ pressure.

Atmospheric
Absolute
Vacuum
Gage

Explanation:-

Answer: Option B. -> Absolute

Question 7. Meleoid gauge measures the __________ pressure.

Positive
Sub-atmospheric
Very high
Atmospheric

Explanation:-

Answer: Option B. -> Sub-atmospheric

Question 8. Which of the following thermocouples is capable of measuring a temperature of -50°C?

Platinum - platinum + rhodium
Chromel - alumel
Iron-constantan
Copper - constantan

Explanation:-

Answer: Option A. -> Platinum - platinum + rhodium

Question 9. Which of the following is not a variable area flow meter?

Piston type meter
Rotameter
Magnetic flow meter
Orifice and tapered plug meter

Explanation:-

Answer: Option C. -> Magnetic flow meter

Question 10. A manometer measures the __________ pressure.

Atmospheric
Absolute
Gauge
None of these

Explanation:-

Answer: Option C. -> Gauge