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ZanzabumX [31]
3 years ago
7

What are the four processes of the Carnot cycle? Sketch the Carnot cycle (a) on T-s (temperature - entropy) and P-V (pressure -

volume) diagrams and calculate the thermal efficiency of the Carnot cycle if it operates between 800°C and 15 °C

Engineering
1 answer:
Tanya [424]3 years ago
5 0

Answer:

\eta = 0.7315

Explanation:

Carnot cycle

Carnot cycle have four process

1. Iso thermal expansion

2.Reversible adiabatic expansion

3. Iso thermal compression

4.Reversible adiabatic compression

 This is ideal cycle for all work producing devices.All devices have efficiency less than Carnot cycle. Because in Carnot cycle all process is reversible process.

Efficiency of Carnot cycle given as

\eta =1-\dfrac{T_1}{T_2}

But temperature must be in Kelvin

So

\eta =1-\dfrac{288}{1073}

\eta = 0.7315

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Wittaler [7]

Answer:

battery life in year = 9 years and 48 days

Explanation:

given data

Battery Ampere-hours = 1.5

Pulse voltage = 2 V

Pulse width = 1.5 m sec

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Current drain on the battery = 1.25 µA

to find out

battery life in years

solution

we get first here duty cycle that is express as

duty cycle = \frac{width}{period}      ...............1

duty cycle = 1.5 × 10^{-3}

and applied voltage will be

applied voltage = duty energy × voltage    ...........2

applied voltage = 1.5 × 10^{-3} × 2

applied voltage = 3 mV

so current will be

current = \frac{applied\ voltage}{resistance}   ................3

current = \frac{3}{150}

current = 20 µA

so net current will be

net current = 20 - 1.25

net current = 18.75 µA

so battery life will be

battery life = \frac{1.5}{18.75*10^{-6}}

battery life = 80000 hours

battery life in year = \frac{80000}{8760}

battery life in year = 9.13 years

battery life in year = 9 years and 48 days

4 0
3 years ago
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Answer:

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pav-90 [236]

Answer:

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Explanation:

Assuming the point of the question is that the engineers want to focus on using energy efficiently when starting and stopping, they would likely want to consider a regenerative braking system. Such a system can store energy during braking so that it can be used during starting, reducing the amount of energy that must be supplied by an outside power source.

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