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4 years ago

6

One proposed technique to reduce outage probability is to use macrodiversity, where a mobile unit’s signal is received by multip

le base stations and then combined. This can only be done if multiple base stations are able to receive a given mobile’s signal, which is typically the case for CDMA systems. Explain why this might reduce outage probability.

1 answer:

NARA [144]4 years ago

5 0

Answer:

This might reduce outage probability because multiple base stations are able to receive a given mobile signal at a time which lead to signal outage decrease or weakness.

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Carbon dioxide gas enters a pipe at 3 MPa and 500 K at a rate of 2 kg/s. CO2 is cooled at constant pressure as it flows in the p

Viktor [21]

Answer:

a) 0.0629 $m^{3}/s$ ,ρ1=31.76 $kg/m^{3}$ ,0.05688 $m^{3}/s$

b) 0.06171 $m^{3}/s$ ,32.40966 $kg/m^{3}$ 0.05498 $m^{3}/s$

c) 0.004%

given data:

n=2 kg/s

R=188.92 J/kgK

$T_{1}$ =500 K

$T_{2}$ =450 K

solution:

a) as we know ideal gas relation

PV=nRT..........(1)

The volume flow rate of inlet is

$V_{1}= \frac{nRT_{1} }{P}$ ..................(2)

putting the value in eq(2)

$V_{1}$ =0.0629 $m^{3}/s$

to find destiny

ρ1= $\frac{n}{V_{1} }$ ...........................................(3)

putting value of n and V1 is eq 3

ρ1=31.76 $kg/m^{3}$

$V_{2} =\frac{nRT_{2} }{P}$ ............(A)

putting value in eq A

=0.05688 $m^{3}/s$

to find the rates from the compressibility factors we have to find the reduced pressure and temperature in both cases

P(reduced 1)= $\frac{P_{1} }{P_{crit} }$ = $\frac{3.10^{6} }{7.39 . 10^{6}}$ =0.41

T(reduced 1)= $\frac{T_{1} }{T_{crit} }$ = $\frac{500K}{304.25K}=1.64$

b) After looking at the chart we obtain $Z_{1}$ =0.98 now the volume flow rate at the inlet is:

$V_{1} =\frac{nRT_{1} Z_{1} }{P}$ ....................................................(4)

Putting the values in eq(4)

=0.06171 $m^{3}/s$

Now the density is

ρ= $\frac{n}{V_{1} }$

=32.40966 $kg/m^{3}$

now the reduced pressure and compressibility factor in second case will be

T(reduced 2)= $\frac{T_{2} }{T_{crit} }$ = $\frac{450}{304.25}$ =1.48

P(reduced 2)=P(reduced 1)=0.41

$Z_{2}$ =0.97

$V_{2} =\frac{nRT_{2} Z_{2} }{P}$ ............................................(5)

putting value in eq (5)

=0.05498 $m^{3}/s$

c) now find the error

Δn/n=modulus(ρ1 $V_{1}$ -n/n)*100%.....................(6)

putting the value in eq 6

=0.004%

6 0

3 years ago

A satellite orbits the Earth every 2 hours at an average distance from the Earth's centre of 8000km. (i) What is the average ang

AlexFokin [52]

Answer:

i)ω=3600 rad/s

ii)V=7059.44 m/s

iii)F=1245.8 N

Explanation:

i)

We know that angular speed given as

$\omega =\dfrac{d\theta}{dt}$

We know that for one revolution

θ=2π

Given that time t= 2 hr

So

ω=θ/t

ω=2π/2 = π rad/hr

ω=3600 rad/s

ii)

Average speed V

$V=\sqrt{\dfrac{GM}{R}}$

Where M is the mass of earth.

R is the distance

G is the constant.

Now by putting the values

$V=\sqrt{\dfrac{GM}{R}}$

$V=\sqrt{\dfrac{6.667\times 10^{-11}\times 5.98\times 10^{24}}{8000\times 10^3}}$

V=7059.44 m/s

iii)

We know that centripetal fore given as

$F=\dfrac{mV^2}{R}$

Here given that m= 200 kg

R= 8000 km

so now by putting the values

$F=\dfrac{mV^2}{R}$

$F=\dfrac{200\times 7059.44^2}{8000\times 10^3}$

F=1245.8 N

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3 years ago

Ignorance: noun

jarptica [38.1K]

Answer:

A: the condition of living without the benefit of education at some level

Explanation:

As a noun, ignorance is simply defined as the lack of knowledge about a common thing.

For example, he was ignorant about the schemes of his colleagues at the office.

Thus, from the given options, the correct answer is: "the condition of living without the benefit of education at some level".

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3 years ago

Why is it important for engineers to consider both short and long term implications of their work?

polet [3.4K]

The right answer should be A).

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3 years ago

What is engineering

kirill [66]

Answer:

Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings. In other words, Engineering is the use of science and math to design or make things.

Explanation:

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3 years ago

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