Chemical Engineering - Process Control and Instrumentation

6. 

Pick out the wrong statement.

A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
B. CO2 is the strongest paramagnetic gas.
C. Paramagnetic susceptibility of gases decreases with temperature.
D. Paramagnetic susceptibility of gases permits the measurement of their concentration.

Answer: Option B

Explanation:

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7. 

The __________ of a vapor pressure thermometer is a functioning element.

A. pointer
B. bourdon tube
C. bulb
D. none of these

Answer: Option A

Explanation:

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8. 

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

A. stable
B. unstable
C. critically damped
D. none of these

Answer: Option B

Explanation:

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9. 

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

A. insulator
B. conductor
C. solid semi-conductor
D. liquid semi-conductor

Answer: Option C

Explanation:

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10. 

Flapper nozzle is used in a/an __________ controller.

A. electronic
B. hydraulic
C. pneumatic
D. none of these

Answer: Option C

Explanation:

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