ENGR 225
Name ___________________________
October 31, 2007
Please Check One
Recitation: 8:30___;10:15; ___1:15___
Short answer (2 pts. Each, for T/F and multiple choice
circle
the best answer of the choices given
, fill in the blank must be completed
with a meaningful word or phrase)
1.
For flow in a pipe, the mass flow rate is the product of the density of the fluid, the cross sectional area perpendicular to the
direction of flow and the ______________ velocity of the fluid.
2.
T F For steady state flow,
˙
m
in
"
=
˙
m
out
"
is always true.
3.
Flow work
a)
is the same as flow energy
b)
is the product of pressure and volume
c)
has the same units as kinetic energy
d)
all of the above
e)
none of the above
4.
For an open system, energy can be transported into and out of the system by both of the mechanisms that operate for closed
systems. In addition
, for open systems _______________ can transfer energy in or out.
5.
T F The expression,
˙
Q
"
˙
W
=
˙
m
out
#
h
+
V
2
2
+
gz
$
%
&
’
(
)
"
˙
m
in
#
h
+
V
2
2
+
gz
$
%
&
’
(
)
is the first law of thermodynamics applied to
steady flow through an open system.
6.
For flow through an adiabatic throttling valve as illustrated
to the right,
the energy balance given in question 5 simplifies to
2
2
"
#
$
%
&
’
=
˙
m
2
h
2
+
V
2
2
2
"
#
$
%
&
’
7.
A turbine ______________ energy from moving fluid.
8.
T F When a process is cyclic, the cycle is closed only when the fluid returns to its original state.
9.
All heat engines in the real world
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 Fall '08
 Landau
 Dynamics, Fluid Dynamics, Thermodynamics, Energy, Heat, Mass Transfer, Heat engine

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