When welding stick (SMAW) what is the distance between top of bare end of electrode and base metal?

An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa

mote1985 [20]

Answer:

COP = 3.828

W' = 39.18 Kw

Explanation:

From the table A-11 i attached, we can find the entropy for the state 1 at -20°C.

h1 = 238.43 KJ/Kg

s1 = 0.94575 KJ/Kg.K

From table A-12 attached we can do the same for states 3 and 4 but just enthalpy at 800 KPa.

h3 = h4 = hf = 95.47 KJ/Kg

For state 2, we can calculate the enthalpy from table A-13 attached using interpolation at 800 KPa and the condition s2 = s1. We have;

h2 = 275.75 KJ/Kg

The power would be determined from the energy balance in state 1-2 where the mass flow rate will be expressed through the energy balance in state 4-1.

W' = m'(h2 - h1)

W' = Q'_L((h2 - h1)/(h1 - h4))

Where Q'_L = 150 kW

Plugging in the relevant values, we have;

W' = 150((275.75 - 238.43)/(238.43 - 95.47))

W' = 39.18 Kw

Formula foe COP is;

COP = Q'_L/W'

COP = 150/39.18

COP = 3.828

4 0

3 years ago

Calculate the line parameters ????′, ????′, ????′, and ????′ for a coaxial line with an inner conductor diameter of 0.5 cm and a

kati45 [8]

Answer:

attached below

Explanation:

6 0

3 years ago

Tech A says that the MIL can turn off if the fault doesn’t reappear in a certain number of tests. Tech B says that when an MIL i

DanielleElmas [232]

Answer:

Both Tech A and B are correct

Explanation:

One the three method of turning off the MIL is when Vehicle drive on 3 consecutive trips with warm-up cycle without detecting fault. So, with this statement, Tech A is correct.

The MIL will be acrivated when DTC stored in memory and so, the Tech B is also correct.

4 0

3 years ago

A completely reversible heat pump produces heat at a rate of 300 kW to warm a house maintained at 24 °C. The exterior air, which

trapecia [35]

Answer:

No.

Explanation:

The Coefficient of Performance of the reversible heat pump is determined by the Carnot's cycle:

$COP_{HP} = \frac{T_{H}}{T_{H}-T_{L}}$

$COP_{HP} = \frac{297.15\,K}{297.15\,K-280.15\,K}$

$COP_{HP} = 3.339$

The power required to make the heat pump working is:

$\dot W = \frac{300\,kW}{3.339}$

$\dot W = 89.847\,kW$

The heat absorbed from the exterior air is:

$\dot Q_{L} = 300\,kW - 89.847\,kW$

$\dot Q_{L} = 210.153\,kW$

According to the Second Law of Thermodynamics, the entropy generation rate in a reversible cycle must be zero. The formula for the heat pump is:

$\frac{\dot Q_{L}}{T_{L}} - \frac{\dot Q_{H}}{T_{H}} + \dot S_{gen} = 0$

$\dot S_{gen} = \frac{\dot Q_{H}}{T_{H}} - \frac{\dot Q_{L}}{T_{L}}$

$\dot S_{gen} = \frac{300\,kW}{297.15\,K}-\frac{210.153\,kW}{280.15\,K}$

$\dot S_{gen} = 0.259\,\frac{kW}{K}$

Which contradicts the reversibility criterion according to the Second Law of Thermodynamics.

5 0

3 years ago

From the isometric view orientation resource, what are the four typical characteristics of a front view?

Natasha_Volkova [10]

From an isometric view orientation resource, the four (4) typical characteristics of a front view include the following:

The front view graphically shows the length and height of an object
The front view has the least amount of hidden lines.
The front view must be chosen first.
The front view's orientation influences the other views.

<h3>What is an isometric sketch?</h3>

An isometric sketch is also referred to as an isometric drawing and it can be defined as a graphical (pictorial) representation of a physical object in technical and engineering drawings, especially by drawing all its three dimensions (3D) at full scale.

<h3>The five characteristics of isometric sketches.</h3>

In technical and engineering drawings, the five (5) characteristics of isometric sketches include the following:

The final image isn't distorted.
The image is in three dimensions (3D).
The final image is drawn to full scale.
The image are all uniformly foreshortened.
They are drawn using vertical lines and horizontal lines.

From an isometric view orientation resource, the four (4) typical characteristics of a front view include the following:

The front view graphically shows the length and height of an object
The front view has the least amount of hidden lines.
The front view must be chosen first.
The front view's orientation influences the other views.

Read more on isometric sketches here: brainly.com/question/17275728

#SPJ1

7 0

2 years ago