MAE 91 Fall 2016 Professor Rangel Quiz 6
Name: 1D:
1) In your own words, write down the Kelvin-Planck Statement of the 2nd Law of
Thermodynamics
Mm its at kaimyqj 1,) W In NM (/1 aid/cfw_ca which
watch/3M. 9341 WWWQ Mvaan/vii Wait
dexmyhj W (MU wait a M13
A cylinder fitted with a frictionless piston contains water initially
at 0.7 bar and quality of 0.35, occupying a volume of 800 cc '
(1000 cc = 1 liter = 10'3 mg). The water is then heated in a quasi~
equilibrium process to a temperature of 220 0C.
(3) Sk
MAE 91 SPRING 2017 Professor Rangel Quiz 4
Name: ID:
Circle one: I (have) (have not) watched Lectures 7 and 8 on line.
1.8 g of air initially at 280K and 1.2 bar undergo a polytropic process with n=-1 to a pressure of 1.9 bar. The
universal gas constant i
Consider the cylinder shown in the figure which contains 2.1 g of air initially at
300K and 100 kPa. Heat is then added to the air thus making the piston rise.
The piston first touches the spring when the air occupies a volume of 2.9 liters
(1 l = 10" m3.
MAE 91 FALL 2016 Professor Rangel ' Quiz 2
Name: ID:
Circle one: I (have) (have not) watched Lectures 3 and 4 on line.
A cylinder fitted with a frictionless piston contains water initially
at 160 oC and 0.7 bar, occupying a volume of 800 cc (1000 cc = 1
l
MAE 120 Homework #2 Solutions
Problem 1: Following the development in Section 3.2, we have () = (). Since we have
() = 0.12 /5 , = 60.5/ , then 0 102 /5 = 60.5/ () 0 ).
Integrating the left hand side, we have
501 ( 5 1) = 60.5/ () 400)
Since we must have
MAE 120 Homework #5 solutions
Problem 1: A 100-long pipe of inner radius 0.4 has constant heat flux of = 20/2 on
its surface. Air enters the pipe with an unknown mass flow rate, and an inlet mean temperature
, = 300. Find the minimum possible value for if
Homework #1 solutions
Problem 1: a) The temperature varies linearly between ( = 0) = 36 and
( = 1.5 = 0.015) = 10. Therefore,
() = 36 + (10 36) 0.015 = 36 3.073/ , so from Fouriers law
=
= 3.073/ = 5 2/ 3.073/ = 153.33/2
b) From Newtons law of cooling,