# Thermodynamic Units 3

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 Author: RJVan ID: 236295 Filename: Thermodynamic Units 3 Updated: 2016-04-07 16:54:15 Tags: Heat engineering thermodynamics Folders: Mechanical Engineering Description: Mechanical Professional Engineering Exam Review Show Answers:

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1. Which of these expressions of power is incorrect?
A.BTU
B.Tons
C.Foot-Pound/sec
D.Watts
A.BTU

The correct units is BTU/hr. (BTU is work or energy.)
(this multiple choice question has been scrambled)
2. Which expression of power is incorrect?
A.BTU/hr
B.Watts
C.Tons
D.Foot-Pounds
D.Foot-Pounds

The correct units is ft-lb/sec. (ft-lb is work or energy.)
(this multiple choice question has been scrambled)
3. Which expression of energy is incorrect?
A.kilowatt
B.ft-lb
C.BTU
D.Joule
A.kilowatt

The correct units is kW-hr. (kW is power)
(this multiple choice question has been scrambled)
4. Which expression of energy is incorrect?
A.BTU
B.Joule
C.ft-lb/sec
D.kilowatt-hour
C.ft-lb/sec

The correct units is ft-lb. (ft-lb/sec is power)
(this multiple choice question has been scrambled)
5. What is Joule's constant? How is it used in the definition of enthalpy?

6. What is the conversion between ft-lb/sec and HP?
550 ft/lb/sec = 1 HP
7. What is the specific heat of water?
1 BTU/lbm-F
8. What is the density of air?
0.075 lbm/ft3
9. What units define a Pascal (Pa)?
1Pa = 1 N/m2
10. What is the density of water?
62.4 lbm/ft3
11. What are the units for gc?
ft-lbm/lbf-sec2
12. What is the conversion factor between feet and meters?
1 ft =0.305 m
13. What is the quality of 87% wet steam?
For 87% wet steam, x=0.13
14. What is the definition of "quality" for specific volume?
15. Given hf, hfg, and x, what is h?
h = hf +xhfg

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