A converging–diverging nozzle is designed to generate an exit
Mach number of 2. The nozzle is supplied with air from a large
reservoir in which the pressure is kept at 6.5 MPa. Assuming
one-dimensional isentropic flow, find
a. The maximum back-pressure at which the nozzle will be
choked
b. The range of back-pressures over which there will be a shock
in the nozzle
c. The design back-pressure
d. The range of back-pressures over which there is supersonic
flow on the...
A converging-diverging nozzle is designed to operate
with an exit Mach
number of 2. The nozzle is supplied from an air reservoir at 600
kPa and temperature
is 300 K. The throat area of the nozzle is 5 cm2
.
Determine:
(a) The ratio of exit-to-throat area and exit area
(b) Given the area ratio in part (a), find the range of back
pressure over which the
nozzle is choked. What is the critical pressure and design
pressure?
Also, calculate...
A converging-diverging nozzle is designed to operate with an
exit Mach number of 2. The nozzle is supplied from an air reservoir
at 600 kPa and temperature is 300 K. The throat area of the nozzle
is 5 cm2.
Determine:
(a) The ratio of exit-to-throat area and exit area.
(b) Given the area ratio in part (a), find the range of back
pressure over which the nozzle is choked. What is the critical
pressure and design pressure?
Also, calculate the...
Helium at 200 kPa, 227 C is expanded in steady flow through a
nozzle to 100 kPa. At these operating conditions the nozzle
efficiency is 76%.
a) Making the usual nozzle assumptions, calculate the actual
velocity at the nozzle exit. Start with the appropriate form of the
first law.
b) Calculate the actual nozzle exit temperature.
A convergent-divergent nozzle operates under out-of-design
conditions, resulting in
formation of a normal shock wave in the diverging section. A large
reservoir
supplies air to the nozzle at 400 kPa and 800 K. The throat of the
nozzle is 0.2 m2. The number
Mach upstream of the shock wave is M1 = 2.44. The nozzle area at
the exit is
0.7 m2. Calculate the area of the nozzle at the location of the
shock wave and the temperature of the...
Explain which policies should be used under the following
conditions to achieve both internal and external balance.
A trade deficit combined with output above potential;
A trade deficit combined with output below potential;
A trade surplus combined with output above potential;
A trade surplus combined with output below potential.
Question 4:
(a) Do you think that macroeconomic policy should be designed to
achieve a measured unemployment rate of zero? Why or why not should
this be the case?
(b) How did the classical economists interpret long-run
unemployment? (2.5 marks)
(c) How does structural and cyclical unemployment differ and how
concerned should policymakers be about these types of unemployment?
(2.5 marks)
Please give Accurate Answers.
A continuous evaporator is operated with a given feed material
under conditions in which the
concentration of the product remains constant. The feed rate at the
start of a cycle after the
tubes have been cleaned has been found to be 5000 kg/h. After 48 h
of continuous operation,
tests have shown that the feed rate decreases to 2500 kg/h. The
reduction in capacity is due to
true scale formation. If the downtime per cycle for emptying,
cleaning, and recharging...
A certain pen has been designed so that true mean writing
lifetime under controlled conditions (involving the use of a
writing machine) is at least 10 hours. A random sample of 18 pens
is selected, the writing lifetime of each is determined, and a
normal quantile plot of the resulting data supports the use of a
one-sample t test.
For all hypothesis test questions follow the following
procedure (1-4) :
1. State the null and alternative hypotheses and your
significance...
A certain pen has been designed so that true average writing
lifetime under controlled conditions (involving the use of a
writing machine) is at least 10 hours. A random sample of 20 pens
is selected, the writing lifetime of each is determined, and a
normal probability plot of the resulting data supports the use of a
one-sample t test. (a) What hypotheses should be tested if the
investigators believe a priori that the design specification has
been satisfied?
(b) What...