Chemical Engineering - Process Control and Instrumentation
Exercise :: Process Control and Instrumentation - Section 1
| 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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