HOMEWORK 8
Hydrogen gas in a rigid tank (volume 3 m"3) is cooled from 250kPa and 550K to 300K. Find the following:
(a) Can hydrogen be assumed to behave as an ideal gas here? Must justify for credit.
(b) What is the mass of hydrogen in the tank?
(c) What

Student Name:
MEGR 3111 -Test‘2.Spring 2016
Closed book, closed notes. Only use the supplied tables and equation sheet. No programmable calculators permitted.
A. Conceptual Questions (10points total) — 2 pts/each
1. Steady flow devices that result in a dr

HOMEWORK #6
A number of small weights are placed on the head of a piston in a frictionless piston cylinder. The initial pressure,
P1=200kPa. The initial volume of the gas within is 0.04m"3.
(a) If heat is added in such a way such that the volume of the ga

Single phase
General penalties:
*1 pt for each math error
*1 pt for not including units (more if there is a conversion error)
*At least 1 pt for not listing assumption assumption (s)
Ex. For problem 1d, you need to assume that (1) v=constant because (2) m

*5 points for give,
find, assumptions
and solution
*30 points for
showing air
behaves as IG
(15points for state 1
and 15 points for
state 2)
*65 points for (b)
-35 points for
applying ideal gas
law to state 1 and 2
(10 points out of
this 35 if do not
expl

HOMEWORK 7
A frictionless piston cylinder. ﬁlled with water. is initially at 1MPa and 400C with a volume of 2.5m"3. The steam is
cooled at a constant pressure until the water is a saturated vapor. Find the following:
a. Mass of the steam
b. Final temperat

A reversible power cycle whose thermal efficiency is 40% receives 50kJ of heat transfer from a hot reservoir at 600K and rejects
energy by heat transfer to a cold reservoir at temperature T L.
(a) How much heat energy is rejected to the cold temperature r

HOMEWORK l 1
Steam enters a well—insulated turbine at 5 MPa and 525C. 10% ofthe steam is extracted at 0.8MP21 and 400C and the
rest ofthe steam (90%) exits the turbine at IOOkPa with a quality of89% (see diagram). If the steam enters the turbine
with a vo

Problem 1:
*5 points for given,
find, assumptions,
solution
*45 points for v
(10pts for vf, 10pts
for vg, 15points for
equation)
Problem 2:
*5 points for given,
find, assumptions,
solution
*45 points for P
(may be awarded 5
points out of 45 if
did not int

Home UQOV l< io:
Steam enters a well-insulated nozzle operating at steady state. Steam enters at 500C, loom/s. and 2kg/s. It
exits at 300°C. Pressure drops across the nozzle from 4MPa to 1MPa. Find the following:
(8) Exit velocity [m/s]
(b) Inlet cross se

MEGR 3 111 Homework
Air enters an insulated turbine operating at steady state at 17C, lOOkPa, and exits at 330kPa.
Assuming the air behaves as an ideal gas with constant speciﬁc heats (taken at 300C for convenience)
and that kinetic and potential energy c

———'_F'-m*———F—'_
- meet: aw " HM) W
“a-
Problem 1: Saturated wateris compressed in an insulated pump operating at steady state from 250kPa to 2500kPa ‘
isentropically. Assuming negiigible changes in kinetic and potential energy, evaluate the work for the

ﬂbMéuJOVK lg? ' ‘ i
Air enters a 2 inlet, 1 outlet, insulated mixing chamber operating at steady state as shown below. Ignoring kinetic and
potential energy changes across the tank, determine the temperature at the exit and the rate of entropy produced [k

Student Name:_
MEGR 3111 Practice Test 1
Closed book, closed notes. Only use the supplied tables and equation sheet. Only non-programmable calculators allowed.
Conceptual Questions (10points total). Choose the best answer:
1. The following can cross the b

Student Name:_
MEGR 3111 Practice Test 3 Part I
Closed book, closed notes. Only use the supplied tables and equation sheet. Draw a box around each of your answers with the associated
problem number/letter beside of the box. Clearly state all assumptions.

Student Name:_
MEGR 3111 Practice Test 2 Spring 2016
Closed book, closed notes. Only use the supplied tables and equation sheet. No programmable calculators permitted.
A. Conceptual Questions (10points total) 2 pts/each
1. _ is the work associated with th

*5 points for given, find, assumptions, solution
*(a) 22 points
(b) 23 points
(c) 25 points (minus up to 10 if not labeled)
(d)25 points (minus up to 10 if not labeled)

GlVE'IlI Initial measurements to he converted to the specied units. Mass of steam in tank
Volume of steam.
Find: Initial measurements to he convened. Find and convert the given parameters. Find the
specic volume contained in the'tahlc Is this a closed or

Student Name:_
MEGR 3111 Test 3 Key Closed book, closed notes.
A. Conceptual Questions (10points total) 2 pts/each, bonus is 1pt
1. (2pt) Flow work is the work associated with the fluid pressure as mass enters (and thus
displaces an amount of mass of the

NAME He.
MEGR3111, s ring 2017
Closed book, closed notes. Nonprogrammable lcalculators only. You MUST SHOW WORK for credit.
CONCEPTUAL QUESTIONS
1. (2pt) A gage measuring the pressure of lair contained within a piston cylinder reads 30 psi. The surroundin

NAME_
MEGR 3111 PRACICE TEST 1, Fall 2016
Closed book, closed notes. Non-programmable calculators only. You MUST SHOW WORK for credit.
CONCEPTUAL QUESTIONS
1. (2pt) As a pure substance goes through a constant pressure phase change from a liquid to a gas,

Student Name:_
MEGR 3111 Test 1 Spring 2017
Closed book, closed notes. Only use the supplied tables and equation sheet. No programmable calculators permitted.
A. Conceptual Questions (10points total) 2 pts/each, bonus is 1pt
1. (2pt) A gas fills a piston