In: Electrical Engineering

[BI A 30kVA, 3000/1 1 0 V transfomier, the following
experimental data was obtained:

0.C test: 3000 V, 0.5 A,

350 W

S.C test: 150 V, 10 A,

500 W

Calculate (a) the efficiency at full load, 0.8p.f. (b) the kVA
output at which the efficiency

is ma)cimum (comment on the obtained resu]ts)f 1 5 Marks]

Dear student I hope it will help you. Please don't forget to give thumbs up. Thank you

1.Determine whether S spans V . Justify your answers.
V = C ^0 [−1, 1] (the vector space of continuous functions on
[−1, 1]) and S = {1, t, t2 , t3 , . . . }.
2.Let S be a set in a vector space V and v any vector. Prove
that span(S) = span(S ∪ {v}) if and only if v ∈ span(S).

verify that the function det has the following properties
1. det(... ,v,..., v,...)=0
2. det(...,cv+dw,...)=c*det(...,v,...)+d*det(...,w,...)
3. use the above properties and normalization to prove that
A= det(...,v+cw,...w,...)=det(...,v,...,w,...)
B=det(...,v,...,w,...)= (-1)*det(...,w,...,v,...) and
C= det [diag (λ1, ... , λn ) ] = Πiλi

Heat transfer
In a test in a double tube heat exchanger the following data are
obtained
For hot fluid
Flow = 11.6 gal / sec
Outlet temperature = 30.1 ° C
Inlet temperature = 32 ° C
For cold fluid
Flow 11gal / min
Outlet temperature 25.1 ° C
Inlet temperature 24.2 ° C
For the fluid consider
k = 0.49 w / mK
cp = 3729.95 J / kgK
Prandtl number = 14.29
Density = 1035.02kg / m3
Get:...

Heat transfer
in a test in a double tube heat exchanger the following data are
obtained
For hot fluid
Flow = 11.6 gal / sec
Outlet temperature = 30.1 ° C
Inlet temperature = 32 ° C
For cold fluid
Flow 11gal / min
Outlet temperature 25.1 ° C
Inlet temperature 24.2 ° C
For the fluid consider
k = 0.49 w / mK
cp = 3729.95 J / kgK
Prandtl number = 14.29
Density = 1035.02kg / m3
Get:...

Consider the data set below.
x
22
99
88
44
99
99
y
66
44
88
55
77
11
For a hypothesis test, where ?0:?1=0 and ?1:?1≠0, and using
?=0.01 , give the following:
(a) The test statistic ?=
(b) The degree of freedom ??=
(c) The rejection region |?|>
The final conclustion is
A. There is not sufficient evidence to reject the null
hypothesis that ?1=0 β 1 = 0 .
B. We can reject the null hypothesis that...

4. The following data were obtained from a creep test for a
specimen having an
initial gage length of 2.0 in. and an initial diameter of 0.6
in. The initial stress
applied to the material is 10,000 psi. The diameter of the
specimen after fracture
is 0.52 in.
Length Between Gage Marks ( (in.)
Time (h)
Strain (in./in.)
2.004
0
0.002
2.01
100
0.004
2.02
200
0.006
2.03
400
0.008
2.045
1000
0.012
2.075
2000
0.020
2.135
4000
0.035
2.193...

In a study on air pollution carried out
by an experimental station, we obtained the following amounts of soluble benzene, suspended in
organic in micrograms per m3
, in different samples
of air:
2.28, 1.9, 3.32, 2.68, 2.57, 2.57, 0.928, 1.22
Assuming that the sampled population is approximately normal, construct a confidence interval at the level
90% for the corresponding real average.

For the reaction
A(g) + B(g) + C(g) "
D(g) the following data were
obtained at 25°C.
Exp’t
Initial [A] (M)
Initial [B] (M)
Initial [C] (M)
Initial Rate (mole∙L–1s–1)
1
0.0500
0.0500
0.0100
6.25 x 10–3
2
0.1000
0.0500
0.0100
1.25 x 10–2
3
0.1000
0.1000
0.0100
5.00 x 10–2
4
0.0500
0.0500
0.0200
6.25 x 10–3
5
0.2000
0.3000
0.3000
?????
Which choice gives correct kinetics information for this
reaction? Which choice is closest to the rate
constant for this...

The performance for a power factor of 1 of a 200KVA, 3000/380 V
single phase transformer is 0.98 for both full load and medium
load. The vacuum power factor is 0.2 and the voltage drop at full
load with a power factor of 0.8 is 4%. Determine the parameters of
the equivalent circuit of the transformer referred to the primary
side.

Given a list of positive integers c[0...n − 1], and a positive
integer v, decides whether we can use numbers from c[0...n − 1] to
make a sum of v, allowing any particular number in the list to be
used multiple times. Or, mathematically, this means that there
exists non-negative integer coefficients, x0, x1, ..., xn−1, such
that v = x0c[0] + x1c[1] + ...xn−1c[n − 1].
For example, given c[0...3] = {2, 4, 6, 10}, and v = 17,...

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