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3 years ago

The phase sequence of a 3-phase system for which VAN = 120 /90o V and VBN = 120 /210o V is:_______

Engineering

1 answer:

Vadim26 [7]3 years ago

4 0

Answer:

b. abc

Explanation:

The phase rotation and its sequence is order in which voltage is reached to their respective sources. The wave forms of a polyphase flow through AC source to the panel. The three phase system has two possible sequence which can be a-b-c or c-b-a. The correct answer is therefore b.

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Consider a fluid with mean inlet temperature Ti flowing through a tube of diameter D and length L, at a mass flow rate m'. The t

EleoNora [17]

Answer:

$T_m(x) = T_i+\frac{\pi D}{\dot{m}c_p}(ax+\frac{bL}{\pi}-\frac{bL}{\pi}cos(\frac{x\pi}{L}))$

Explanation:

Our data given are:

$T_i =$ Mean temperature (inlet)

D = Diameter

L = Length

$\dot{m}=$ Mass flow rate

Equation to surface flow as,

$q(x) = a+bsin(x\pi/L)$

We need to consider the perimeter of tube (p) to apply the steady flow energy balance to a tube , that is

$q(x)pdx=\dot{m}c_p dT_m$

Where $p=\pi D$

Re-arrange for $dT_m,$

$dT_m = \frac{q(x)pdx}{\dot{m}c_p}$

Integrating from 0 to x (the distance intelt of pipe) we have,

$\int\limit^{T_m(x)}_T_i dT_m = \frac{p}{mc_p}\int_0^x q(x)dx$

Replacing the value of q(x)

$\int\limit^{T_m(x)}_T_i dT_m = \frac{p}{mc_p}\int_0^x (a+bsin(x\pi/L))dx$

$T_m(x)-T_i = \frac{\pi D}{\dot{m}c_p}\int_0^x(a+bsin(x\pi/L))dx$

$T_m(x)-T_i = \frac{\pi D}{\dot{m}c_p}(ax-\frac{bL}{\pi}cos(\frac{x\pi}{L}))^x_0$

$T_m(x) = T_i+\frac{\pi D}{\dot{m}c_p}(ax+\frac{bL}{\pi}-\frac{bL}{\pi}cos(\frac{x\pi}{L}))$

8 0

3 years ago

Suppose that a one-celled organism can be in one of two states – either A or B. An individual in state A will change to state B

xxTIMURxx [149]

Answer:

P{x,y} {x - 1, y + 1} = βy/ αx + βy.

P{x,y} {x + 1, y - 1} = βx/ αx + βy.

Explanation:

The full meaning for the acronym "CTMC" given in the question is known as the continuous-time Markov chain. The continuous-time Markov chain is an important tool or instrument which is used in the dealings with stochastic process.

Hence, Xa(t) is the number of organisms in state A, Xb(t) is the number of organisms in state B. Therefore, we can say that the continuous-time Markov chain(CTMC) is;

{ Xa(t), Xb(t)}.

Thus, b(x,y) = αx + βy.

Therefore, we will have;

P{x,y} {x - 1, y + 1} = βy/ αx + βy.

P{x,y} {x + 1, y - 1} = βx/ αx + βy.

Note that, if we are to use the generation of matrix to get differential equation as below;

I(x)α(ix - 1, iy + 1) (JxJy)(t) + iyβ

P (ix + 2, iy -1) (Jx,Jy) (t) - (ixα + iyβ) P(ix,iy)(JxJy) (t).

t is greater or equals to zero for ix,iy, Jx and Jy.

3 0

3 years ago

What is the foundation

vova2212 [387]

Answer:

foundation is ........see more

7 0

3 years ago

What is the weight of a glider with a mass of 5.3 grams? (Hint: watch your units!)

Vinvika [58]

Answer: 0.053

Explanation:

So, we convert 5.3 grams into kilograms.

5.3g = 0.0053 kg (Since 1kg equals 1000g)

On Earth, gravity is 10 N/kg.

Weight = mass x gravity

Weight = 0.0053kg x 10 N/kg

Weight = 0.053 Newtons (On Earth)

6 0

3 years ago

Thoughts on Anime?<br> Whats your fav

nlexa [21]

Is miraculous ladybug one

5 0

3 years ago

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