## Question

## Transcribed Text

1.
Ammonia
passes
through
a
throttling
valve
operating
at
steady
state.
The
flow
at
the
valve
inlet
has
a pressure of 60 lbf/in² and a temperature of 80° F. The flow at the valve outlet has a pressure of 20
lbf/in². Determine the temperature at the valve outlet in °F. Assume the valve is well insulated and
neglect kinetic and potential energy changes.
2.
Refrigerant
134a
passes
through
a
pump
operating
at
steady
state
which
draws
the
refrigerant
up
a
vertical pipe. The flow at the pump inlet has a pressure of 30 bar and a temperature of 20° C. The
flow
at
the
pipe
outlet has a pressure of 30 bar and a temperature of 28° C. The pump supplies a
specific work of 12 kJ/kg to the flow. Determine the height of the pipe outlet relative to the pump
inlet in m. Assume the pump is well insulated and neglect kinetic energy changes.
3. Air passes through a jet engine nozzle operating at steady state. The flow at the nozzle inlet has a
temperature of 900° F. The nozzle inlet has an area of 5 ft². The flow at the nozzle outlet has a
temperature of 875° F, a specific volume of 90 ft³/lb, and a velocity of 600 ft/s. The nozzle outlet has
an
area
of
2
ft².
Model
the
air
as
an
ideal
gas
with
constant
specific
heats.
Evaluate
the
specific
heats
at 900° F. Assume the nozzle is well insulated and neglect potential energy changes. Determine the
velocity in ft/s and specific volume in ft³/lb of the flow at the inlet.
4. Water passes through a turbine operating at steady state. The flow at the turbine inlet has a
pressure of 25 bar and a temperature of 400° C. The flow at the turbine outlet has a pressure of 5
bar.
The
mass
flow
rate
through
the
turbine
is
20
kg/s.
While
passing
through
the
turbine,
the
water
undergoes
a
polytropic
process
with
n=1.2.
Determine
the
power
produced
by
the
turbine
in
MW.
Assume the turbine is well insulated and neglect kinetic and potential energy changes.
5. Propane passes through a diffuser operating at steady state. The flow at the diffuser inlet has a
temperature
of
120°
F,
a
pressure
of
20
lbf/in²,
and
a
velocity
of
750
ft/s.
The
flow
at
the
diffuser
outlet
has
a
pressure
of
20
lbf/in²
and
negligible
velocity. Determine the temperature of the flow at
the diffuser outlet. Assume the diffuser is well insulated and neglect potential energy changes.

## Solution Preview

This material may consist of step-by-step explanations on how to solve a problem or examples of proper writing, including the use of citations, references, bibliographies, and formatting. This material is made available for the sole purpose of studying and learning - misuse is strictly forbidden.

This is only a preview of the solution. Please use the purchase button to see the entire solution