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3 years ago

Source of energy in wind power

1 answer:

3 0

The energy in which wind is used to generate electricity is known as wind energy. Wind turbines convert the kinetic energy in the wind into mechanical power. This mechanical power is then used for various purposes. Wind energy is a free and renewable resource. It is a clean and non-polluting source of energy.

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Which step in the engineering design process most likely broke down in the following scenario?

yawa3891 [41]

The Tacoma narrows project required a bridge to be buiilt over the columbia river.

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3 years ago

Which of the following is not a task electricians typically do when maintaining a building’s electrical system?

Scorpion4ik [409]

Answer:replace insulation to help control...

Explanation:

Thats a insulation workers job

4 0

3 years ago

A thick aluminum block initially at 26.5°C is subjected to constant heat flux of 4000 W/m2 by an electric resistance heater whos

Yanka [14]

Given Information:

Initial temperature of aluminum block = 26.5°C

Heat flux = 4000 w/m²

Time = 2112 seconds

Time = 30 minutes = 30*60 = 1800 seconds

Required Information:

Rise in surface temperature = ?

Answer:

Rise in surface temperature = 8.6 °C after 2112 seconds

Rise in surface temperature = 8 °C after 30 minutes

Explanation:

The surface temperature of the aluminum block is given by

$T_{surface} = T_{initial} + \frac{q}{k} \sqrt{\frac{4\alpha t}{\pi} }$

Where q is the heat flux supplied to aluminum block, k is the conductivity of pure aluminum and α is the diffusivity of pure aluminum.

After t = 2112 sec:

$T_{surface} = 26.5 + \frac{4000}{237} \sqrt{\frac{4(9.71\times 10^{-5}) (2112)}{\pi} }\\\\T_{surface} = 26.5 + \frac{4000}{237} (0.51098)\\\\T_{surface} = 26.5 + 8.6\\\\T_{surface} = 35.1\\\\$

The rise in the surface temperature is

Rise = 35.1 - 26.5 = 8.6 °C

Therefore, the surface temperature of the block will rise by 8.6 °C after 2112 seconds.

After t = 30 mins:

$T_{surface} = 26.5 + \frac{4000}{237} \sqrt{\frac{4(9.71\times 10^{-5}) (1800)}{\pi} }\\\\T_{surface} = 26.5 + \frac{4000}{237} (0.4717)\\\\T_{surface} = 26.5 + 7.96\\\\T_{surface} = 34.5\\\\$

The rise in the surface temperature is

Rise = 34.5 - 26.5 = 8 °C

Therefore, the surface temperature of the block will rise by 8 °C after 30 minutes.

5 0

3 years ago

A pure metal can be strengthening by addition of impurities. Identify strengthening mechanism that utilize impurities and discus

tiny-mole [99]

Explanation:

Strengthening is the method to improve the strength of material because different type of material property requires for different requirement .Some times requires more ductility,some time requires more strength.

When impurities are mixed with the pure metal then the strength of metal will increases and this is called the strengthening of metal.

The methods of strengthening are as follows

1.Solid solution strengthening and alloying

2.Work hardening

3.Transformation hardening

4.Grain boundary strengthening

5.Precipitation hardening

6 0

4 years ago

Analyze the following ideal transistor circuit. Can use general rule of thumbs for analyzing transistors b-base, c- collector, a

wlad13 [49]

Answer:

a) Vout= 5V

b) Vout= 5V

c) Vbase= 0.6V

d) Vbase= 0.6V

Explanation:

Consider the circuit shown in attachment

a) When Vin is 0V, the base circuit is not turned, so

Ib=0 and Ic=∞ as transistor is not turned on so

Vout =5V

b) When Vin= 5 V,

Ib= (Vin-Vb)/Rb

Ib=(5-0.6)/1000= 0.0044A

Ic= 0.0044×10=0.044A

Vout= 5- 0.044×1000= not real value

Vout= Vce= 5V

c) voltage drop across Vbase= 0.6V

d) Vbase= 0.6V

In all the above cases, the transistor will not be turned on biasing base voltage and resistor values are very high compared to VCC which is 5V in the given circuit

8 0

3 years ago

Read 2 more answers

Source of energy in wind power ​

Source of energy in wind power