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valentinak56 [21]
3 years ago
9

Which of the following is true about ideal standards? a.Ideal standards provide allowance for normal breakdowns and interruption

s. b.Ideal standards can be achieved under efficient operating conditions. c.Ideal standards demand maximum efficiency and no slack is allowed. d.All of these choices are correct. e.None of these choices are correct.
Engineering
1 answer:
marysya [2.9K]3 years ago
8 0

Answer: D. All of the choice A, B and C are correct.

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Pumped-storage hydroelectricity is a type of hydroelectric energy storage used by electric power systems for load balancing. The
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Answer:

A) energy loss E = pgQtH

Where p = density in kg/m3

g = gravity acceleration in m/s2

Q = flow rate in m3/s

t = time taken for flow in sec

H = height of flow in m

B) power required to run pump;

P = pgQH

Explanation:

Detailed explanation and calculation is shown in the image below

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Use the concept that y = c, −[infinity] < x < [infinity], is a constant function if and only if y' = 0 to determine whethe
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attached below

Explanation:

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A cylindrical container is 150mm in diameter and weights 2.25n when empty
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Steam at a pressure of 100 bar and temperature of 600 °C enters an adiabatic nozzle with a velocity of 35 m/s. It leaves the noz
butalik [34]

Answer:

Exit velocity V_2=1472.2 m/s.

Explanation:

Given:

At inlet:

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Properties of steam at 100 bar and 600°C

        h_1=3624.7\frac{KJ}{Kg}

At exit:Lets take exit velocity V_2

We know that if we know only one property inside the dome  then we will find the other property by using steam property table.

Given that dryness or quality of steam at the exit of nozzle  is 0.85 and pressure P=80 bar.So from steam table we can find the other properties.

Properties of saturated steam at 80 bar

   h_f= 1316.61\frac{KJ}{Kg} ,h_g= 2757.8\frac{KJ}{Kg}

So the enthalpy of steam at the exit of turbine  

h_2=h_f+x(h_g-h_f)\frac{KJ}{Kg}

h_2=1316.61+0.85(2757.8-1316.61)\frac{KJ}{Kg}

 h_2=2541.62\frac{KJ}{Kg}

Now from first law for open system

h_1+\dfrac{V_1^2}{2}+Q=h_2+\dfrac{V_2^2}{2}+w

In the case of adiabatic nozzle Q=0,W=0

3624.7+\dfrac{35^2}{2000}+0=2541.62+\dfrac{(V_2)^2}{2000}+0

V_2=1472.2 m/s

So Exit velocity V_2=1472.2 m/s.

4 0
3 years ago
Water is contained in a piston-cylinder assembly undergoes four processes separately, all started from an initial state where th
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Answer:

see pictures

Explanation:

In the pictures you can see the different processes.

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