Thermodynamics Units and Properties.

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Presentation transcript:

Thermodynamics Units and Properties

1. An atmospheric pressure of 15.0 psia is equivalent to... 30.0 psig. 29.4 psig. 14.7 psig. 0.0 psig. P72 Correct Answer: D

2. Assuming a standard atmospheric pressure of 15 psia, 5 inches of mercury (Hg) vacuum is equivalent to... 2.5 psia 5.0 psia 10.0 psia 12.5 psia P473 Correct Answer: D

3. Which one of the following is arranged from the lowest pressure to the highest pressure? 8 psia, 20 inches Hg absolute, 2 psig 8 psia, 2 psig, 20 inches Hg absolute 20 inches Hg absolute, 2 psig, 8 psia 20 inches Hg absolute, 8 psia, 2 psig P1273 Correct Answer: A

4. Which one of the following is the approximate condenser vacuum when condenser pressure is 16 inches Hg absolute? 4 inches Hg vacuum 8 inches Hg vacuum 12 inches Hg vacuum 14 inches Hg vacuum P2173 Correct Answer: D

5. A water storage tank is vented to atmosphere 5. A water storage tank is vented to atmosphere. The tank is located at sea level and contains 100,000 gallons of 80oF water. A pressure gauge at the bottom of the tank reads 5.6 psig. What is the approximate water level in the tank? 13 feet 17 feet 21 feet 25 feet P3173 Correct Answer: A

6. Which one of the following is arranged from the lowest pressure to the highest pressure? 2 psig, 12 inches Hg absolute, 8 psia 2 psig, 18 inches Hg absolute, 8 psia 12 psia, 20 inches Hg absolute, 2 psig 12 psia, 30 inches Hg absolute, 2 psig P2073 Correct Answer: D

A water storage tank is vented to atmosphere A water storage tank is vented to atmosphere. The tank is located at sea level and contains 100,000 gallons of water at 80°F. A pressure gauge at the bottom of the tank reads 9.0 psig. What is the approximate water level in the tank? 13 feet 17 feet 21 feet 25 feet P4537 Correct Answer: C

If a main steam line pressure gauge reads 900 psig, what is the absolute pressure? 870 psia 885 psia 915 psia 930 psia P873 Correct Answer: C

Which one of the following is equivalent to 5 psia? 20 psig 10 psig 10 inches of mercury (Hg) vacuum 20 inches of mercury (Hg) vacuum P1173 Correct Answer: D

10. Condenser air inleakage has caused condenser vacuum to drop from 28 inches Hg to 26 inches Hg. What is the new absolute pressure in the condenser? 8 psia 6 psia 4 psia 2 psia NEW Question Correct Answer: D