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4 years ago

Define centrifugal pump. Give the construction and working of centrifugal pump.

1 answer:

7 0

Centrifugal pump is a hydraulic machine which converts mechanical energy into hydraulic energy by the use of centrifugal force acting on the fluid. These are the most popular and commonly used type of pumps for the transfer of fluids from low level to high level.

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As a general rule of thumb, in-line engines are easier to work on than the other cylinder arrangements.

siniylev [52]

Answer:

The general rule of thumb is that the SMALLER a substance's atoms and the STRONGER the bonds, the harder the substance. Two of the strongest forms of chemical bonds are the ionic and covalent bonds.

Explanation:

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3 years ago

How does the clearance volume affect the efficiency of the Otto cycle?

eduard

Answer:

Explanation:

A smaller clearance volume means a higher compression. A higher compression means better thermal efficiency. However a compression ratio too high might be troublesome, as it can cause accidental ignition of the fuel-air mix. This is the reason why Otto cycle engines have lower compressions that Diesel engines. In a Diesel engine the mix ignites by compression instead of a spark.

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3 years ago

If a person runs a distance of 0.7 km in 3 min, what is his average speed in kilometres/hour

SVEN [57.7K]

Answer:

14 km/hour

Explanation:

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3 years ago

An inventor claims to have developed a food freezer that at steady state requires a power input of 0.25 kW to extract energy by

Snowcat [4.5K]

Answer:

The claim is false. ( $COP_{real} > COP_{ideal}$ ).

Explanation:

The real coefficient of performance of the food freezer is:

$COP_{real} = \frac{\dot Q_{L}}{\dot W}$

$COP_{real} = \frac{3\,kW}{0.25\,kW}$

$COP_{real} = 12$

The ideal coefficient of performance, that is, when freezer has a reversible process, is:

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

$COP_{ideal} = \frac{270\,K}{293\,K-270\,K}$

$COP_{ideal} = 11.739$

A real freezer has a coefficient of performance lesser than or equal to ideal coefficient of performance. Since supposed real coefficient of performance is greater than ideal coefficient of performance. The claim is proved to be false.

7 0

4 years ago

Calculate the time taken to completely empty aswimming pool 15

user100 [1]

Answer:

Time needed to empty the pool is 401.35 seconds.

Explanation:

The exit velocity of the water from the orifice is obtained from the Torricelli's law as

$V_{exit}=\sqrt{2gh}$

where

'h' is the head under which the flow of water occurs

Thus the theoretical discharge through the orifice equals

$Q_{th}=A_{orifice}\times \sqrt{2gh}$

Now we know that

$C_{d}=\frac{Q_{act}}{Q_{th}}$

Thus using this relation we obtain

$Q_{act}=C_{d}\times A_{orifice}\times \sqrt{2gh}$

Now we know by definition of discharge

$Q_{act}=\frac{d}{dt}(volume)=\frac{d(lbh)}{dt}=Lb\cdot \frac{dh}{dt}$

Using the above relations we obtain

$Lb\times \frac{dh}{dt}=AC_{d}\times \sqrt{2gh}\\\\\frac{dh}{\sqrt{h}}=\frac{AC_{d}}{Lb}\times \sqrt{2g}dt\\\\\int_{1.5}^{0}\frac{dh}{\sqrt{h}}=\int_{0}^{t}\frac{0.62\times 0.3}{15\times 9}\times \sqrt{2\times 9.81}\cdot dt\\\\$

The limits are put that at time t = 0 height in pool = 1.5 m and at time 't' the height in pool = 0

Solving for 't' we get

$\sqrt{6}=6.103\times 10^{-3}\times t\\\\\therefore t=\frac{\sqrt{6}}{6.103\times 10^{3}}=401.35seconds.$

4 0

3 years ago

Define centrifugal pump. Give the construction and working of centrifugal pump. ​

Define centrifugal pump. Give the construction and working of centrifugal pump.