CHE218_Exam1Key

CHE218_Exam1Key - ChE 218 – Spring 2008 Exam 1 Name Part...

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Unformatted text preview: ChE 218 – Spring 2008 Exam 1 Name: ________________ Part 1 (30 points) CLOSED Book/Notes This part should take not longer then 10 minutes. Do any 5 of the six problems. Mark an ‘X’ through the number you do not wish graded. When complete, turn this page over and commence work on Part 2 . 1. Consider the following three vessels: A, B, and C. Each contains water (from the same source, same temperature, ρ water = 62.3 lbm/ft 3 ) filled to the depth of (h 2 – h ). All three are open to the atmosphere (P 2 = 1 atm). A pressure reading is taken in each vessel at an elevation referenced by h 1 . Which of the following statements would you expect to find to be true? (circle one) a. P A = P B = P C b. P A > P B > P C c. P A < P B < P C (Problems 2-4) large storage tank (vessel A above) contains oil having a SG oil =.92. The vessel is open to the atmosphere (1 atm abs) and filled to elevation h 2 = 10 feet. The elevation h = 0 feet (datum point) and h 1 = 1 foot. 2. What is the density of the oil in lbm/ft 3 ? Work: Ans: uU ¡¢ gG£ ¤ ¥ ¦ § ¨©g ª «¬ ¨©g ­ § ®¯¥°± ª ²¡³´ ­ µ´¡¢ ¶·¸ ¹º » ª uU¡¢ ¶·¸ ¹º » 3. Based upon your density calculation from problem 2, what is the gauge pressure in lbs/in 2 at elevation h ? (Assume ρ oil = 60 lbm/ft 3 if you did not do problem 2) Work: Ans: 3.98 psig ¼ ª §½¾ ª uU¡¢ ¶·¸ ¹º » ­ ¢´¡´ ¹º ¿ À ­ Á² ¹º ­ ¶·¹ ­ ¿ À ¢´¡´ ¶·¸ ­ ¹º ­ ¹º À Á ÃÄ À ª ¢¡³Å ƿý 4. What is the pressure differential (in psi) between the elevations h...
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This note was uploaded on 04/18/2008 for the course CHE 218 taught by Professor Smith during the Spring '08 term at SDSMT.

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CHE218_Exam1Key - ChE 218 – Spring 2008 Exam 1 Name Part...

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