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AlladinOne [14]

2 years ago

5

The terms batten seam, standing seam, and flat seam all describe types of:

1 answer:

abruzzese [7]2 years ago

5 0

Answer:

<em> (A) architectural sheet metal roofing</em>

Explanation:

By the <em>name itself we can judge</em> that the <em>'Architectural sheet metal roofing'</em> is a <em>kind of metal roofing</em>.

And these type of metal roofing is primarily used for small and big houses, small buildings and as well as in a building that is for commercial use they can be totally flat as well as little bit sloped.

And the words similarly like<em> </em><em>batten and standing seam</em>, and <em>flat seam all tells us that these are the types of</em> architectural sheet metal roofing.

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A dc shunt motor rated at 240 V has a field winding resistance of 120 Ω and an armature resistance of 0.12 Ω. The motor is suppl

patriot [66]

Answer:

a) see attached pic

b) No-load speed: 1368 rpm

c) IL at 1% below no-load speed = 22.4 A

Explanation:

a)

(See attached pic)

b) The No- Load Speed:

Since, Ea = KФn [ Ea=Internal Generated Voltage, k=Machine constant,Ф=flux, n=speed]

As the Vt (terminal voltage) and field resistance (Rf) is constant, If (field current is constant. Assuming negligible armature reaction, the following relationship can be written,

Ea2 / Ea1 = K Ф n2 / K Ф n1

Since K and flux is contant,

Ea2 = (n2 / n1) x Ea1

Or, n2 = (Ea2 / Ea1) x n1 -------- (1)

Since, Ea = Vt - IaRa

But at no load, Ia = 0, therefore,

Ea = Vt

At load condition, IL = 29 A

Therefore,

Ia = IL - Vt/Rf

Ia = 29 - 240/120

Ia = 27 A

Therefore, Ea at this load will be,

Ea = Vt - IaRa

Ea = 240 - (27)(0.12)

Ea = 236.76 V

The No-Load speed of motor can be calculated using equation (1),

n2 = (Ea2 /Ea1 ) x n1

1350 = (236.76/240) x n1

n1 = 1368 rpm = No-load Speed

c)

Now, if the speed is 1% below the no-load speed, which is,

n1 = no load speed = 1368 rpm

n2 = 1% less speed = 1354 rpm [ 1368 - (0.01)(1368) ]

Using equation (1),

n2 = (Ea2/Ea1) x n1

1354 = (Ea2/240) x 1368

Ea2 = 237.5 V

Since, Ea = Vt - IaRa

Ia = (Vt - Ea)/ Ra

Ia = (240-237.5)/(0.12)

Ia = 20.4 A

Now,

IL = Ia + If

IL = 20.4 + 240/120

<em>IL = 22.4 A</em>

When, Speed = 1368 rpm, IL = 4.75 A

When , Speed = 1354 rpm, IL = 22.4 A

When, Speed = 1350 rpm., IL = 29 A

<em>(See attached pic) </em>

7 0

3 years ago

A long rod of 60-mm diameter and thermophysical properties rho=8000 kg/m^3, c=500J/kgK, and k=50 W/mK is initally at a uniform t

Monica [59]

Answer:

Tc = 424.85 K

Explanation:

Given that,

$D = 60 mm = 0.06 m$

$\rho = 8000 kg/m^3$

$k = 50 w/m . kc = 500 j/kg.k$

$h_{\infty} = 1000 w/m^2t_{\infity} = 750 kt_w = 500 K$

$surface area = As = \pi dL \\\frac{As}{L} = \pi D = \pi \timeS 0.06$

HEAT FLOW Q is

$Q = h_{\infty} As (T_[\infty} - Tw) = 1000 \pi\times 0.06 (750-500)$

= 47123.88 w per unit length of rod

volumetric heat rate

$q = \frac{Q}{LAs}$

$= \frac{47123.88}{\frac{\pi}{4} D^2 \times 1}$

$q = 1.66\times 10^{7} w/m^3$

$Tc = \frac{- qR^2}{4K} + Tw$

$= \frac{ - 1.67\times 10^7 \times (\frac{0.06}{2})^2}{4\times 50} + 500$

= 424.85 K

3 0

2 years ago

Help me with this for brainiest:)

kirza4 [7]

Gsvshhenejwnbbwbdbdhebwn

3 0

3 years ago

3 examples of technology transfer pls

OLEGan [10]

Answer: electrical, mathematical, and geographical

Explanation: Yee

- Cash Nasty

3 0

2 years ago

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All aspects of the Kirby-Bauer test are standardized to assure reliability. What might be the consequence of pouring the plates

EleoNora [17]

Answer:

it would affect the distance the antiantibodies diffuse from the disk

Explanation:

7 0

2 years ago