Engineering High School

Steam enters an adiabatic turbine at 8 MPa and 500 C with a mass flow rate of 3 kg/s andleaves at 30 kPa.The isentropic efficiency of the turbine is 0.90. Neglecting the kinetic energy change of the steam, determine (a) the tem-perature at the turbine exit and (b) the power output of theturbine

Answers

Answer 1

Answer:

(a) The exit temperature = 69.1°C

(b)  The power output = 8.3 MW

Explanation:

(a) The enthalpy of steam at 8 MPa and 500°C is given (from online sources) as h₁ = 3399 kJ/kg

The exit temperature = The saturation temperature at 30 kPa = T₄ = 69.096 + 273.15 = 342.246 K

The exit temperature = 69.1°C

(b) The mass flow rate = 3 kg/s

The isentropic efficiency = 0.9 = (h₁ - h₂)/(h₁ - h₂[tex]_s[/tex])

s₁ = 6.727 kJ/kgK

h₂[tex]_s[/tex] = 289.229+ 2335.32* (6.8235 - 6.727 )/6.8235 = 322.26 kJ/kg

Therefore, h₂ = h₁ - (h₁ - h₂[tex]_s[/tex])*0.9

h₂ = 3399  - (3399  - 322.26 )*0.9 = 629.934 kJ/kg

The power output = [tex]\dot m[/tex](h₁ - h₂) = 3 *(3399 - 629.934) = 8307.2 kJ/s =

8.3 MW.

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Orthographic projection is a projection method to present three-dimensional shapes in two-dimensional format in which the projection lines are drawn to be orthogonal to the plane of projection, such that each view of the three-dimensional object is translated to a view of the orthographic projection and orthogonal to the view

A multiview projection is the representation of a three-dimensional projection by two or more two-dimensional views

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Answers

Answer:

To increase the friction so we do not slip while walking.

Explanation:

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The ramp on a railway station has a rough surface to increase friction so that we do not slip while walking on it. If the surface is smooth, then the frictional force between the ramp and the feet becomes less and the chances of slipping are greater.

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Answers

Answer:

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Im taking my drivers ed too. :)

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Answers

Answer:

The best way to ensure that OSHA will conduct a site inspection is by the submission a signed (by a current employee or employee representative) Formal Written complaints following OSHA guidelines (which can be found in the  Council of Safety and Health (COSH) website) which will enable the commencement of process for an on site inspection

As such it is advisable to go through the following procedure before, filing a complaint

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2) If you do not belong to a union, talk to your co-workers

3) Inform your employer who has responsibility for on the job safety

4) Speak or have a meeting with OSHA so as to receive guidance before filing a complaint

Explanation:

If you think a hazard is serious, the best way to ensure that OSHA will conduct a site inspection is to file a complaint.

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Answers

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