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drek231 [11]
3 years ago
8

Consider a cubic block whose sides are 6 cm long and a cylindrical block whose height and diameter are also 6 cm. both blocks ar

e initially at 22°c and are made of granite (k = 2.5 w/m · °c and a = 1.15x 10-6 m^2/s). now both blocks are exposed to hot gases at 550°c in a furnace on all of their surfaces with a heat transfer coefficient of 45 w/m2 · °c. determine the center temperature of each geometry after 10, 20, and 60 minutes.

Engineering
1 answer:
bija089 [108]3 years ago
5 0

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

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A 25 kVA transformer has an iron loss of 200 W and a full-load copper loss of 350 W. Calculate the transformer efficiency for th
Oksanka [162]

Answer:

a. 97.32 percent

b. 97.92 percent

c. 95.91 percent

Explanation:

given parameters

apparent power, S = 25 kVA

Iron Loss, Piron = 200 W

copper Loss at full load, P cufl = 350 W

let the transformer efficiency at full load be E

let the real power be P out

a.

at full load and 0.8 power factor

P out = Scos∅

        = 25 x 10³ x 0.8

        =20000 W or 20 kW

efficiency at full load is

E =  (P out)/(P out + P iron + P cufl) x 100%

   =  (20000)/(20000 + 200 + 350) x 100%

   = 97.32%

b.

at 70% of full load at unity power factor of 1

Pout = 70% x Scos∅

        = 0.7 x 25 x 10³ x 1

        =  17,500W or 17.5kW

copper loss at 70% full load

P cu0.7fl = (70%)² x 350

                 = (0.7)² x 350

                 = 171.5 W

Iron loss remain the same, P iron = 200 W

Efficiency of transformer at 70% of full load

E =  (P out0.7)/(P out0.7 + P iron + P cufl0.7) x 100%

  =  (17500)/(17500 + 200 + 171.5) x 100%

  = 97.92%

c.

at 40% of full load at a power factor of 0.6

P out = 40% x Scos∅

= 0.4 x 25 x 10³ x 0.6

        =  6000 W or 6 kW

copper loss at 40% full load

P cu0.7fl = (40%)² x 350

                 = (0.4)² x 350

                 = 56 W

Iron loss remain the same, P iron = 200 W

Efficiency of transformer at 40% of full load

E =  (P out0.4)/(P out0.4 + P iron + P cu0.4) x 100%

  =  (6000)/(6000 + 200 + 350) x 100%

  = 95.91%

6 0
3 years ago
As Becky was driving "Old Betsy," the family station wagon, the engine finally quit, being worn out after 171,000 miles. It can
andriy [413]

Answer:

1) 4.361 x 10 raised to power 8 revolutions

2) 1.744 x 10 raised to power 9 firings

3) 2.18 x 10 raised to power 8  intake strokes

Explanation:

The step by step explanation is as shown in the attachment

8 0
4 years ago
If a driver must drive when their signal lights or taillights aren't operating properly, they may instead signal by using their
Novosadov [1.4K]

Answer:

Left arm because the driver seat is on the left, so it would be easier, and safer, to use your left arm.

But, if you live in an area in which the driver seat is on the <em>right</em>, then it would be the right arm.

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4 years ago
A large building will need several different types of workmen to install and repair pipes for water, heating,
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Answer:

Plumber and pipefitters

Explanation:

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3 years ago
3. Which instrument measures the height above the ground?
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Altimeters are important navigation instruments for aircraft and spacecraft pilots who monitor their height above the Earth's surface. Skydivers and mountaineers also use altimeters to pinpoint their location in the sky or on the ground.
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