Answered: Water vapor enters a continuous flow…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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37 -

Water vapor enters a continuous flow adiabatic nozzle at a temperature of 350ºC and a pressure of 4.5 MPa. What is the specific volume at the inlet?

a)	0.07343 m³/kg

B)	0.05784 m³/kg

NS)	0.06647 m³/kg

D)	0.05842 m³/kg

TO)	0.05197 m³/kg

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Steam flows isentropically through a nozzle from 1550 kPa, 288°C to 980kPa. For 453 g/s determine a) t2 in K b) A v in m³/s c) A H in kj/kg d) Draw T-S and Pv diagram.
33 - The refrigerant 134a, with an entropy of 0.79 kJ/kgK, is at a pressure of 700 kPa. What is the internal energy of R-134a? a) 251.7 kJ/kg B) 235.6 kJ/kg NS) 220.3 kJ/kg D) 209.9 kJ/kg TO) 245.8 kJ/kg
None
40 - A 1.7 m³ constant volume container initially contains air at a pressure of 98 kPa and a temperature of 21ºC. From a tank with a pressure of 610 kPa, air is provided to flow into the container through a valve. The valve is closed when the vessel pressure is equal to the tank pressure. If the temperature inside the container is 85°C, which of the following is the mass of the air entering the container? a) 11.5kg B) 9.2kg NS) 10.2kg D) 11.1 kg TO) 8.1 kg
12-The saturated vapor refrigerant - 134a (refrigerant, R-134a) is compressed in a compressor from a temperature of 28°C to a pressure of 0.9 MPa. If the compressor efficiency is 89%, which of the following is the compression power? A) 13,57 kJ/kg B) 14,63 kJ/kg C) 3,90 kJ/kg D) 4,92 kJ/kg E) 4,38 kJ/kg
8 - The refrigerant R-134a enters a 29 cm diameter pipe at a speed of 4 m/s. Since the flow is continuous, which of the following is the inlet volumetric flow rate of the refrigerant R-134a? a) 0,3303 m³/h B) 0.3079 m³/h NS) 0.2642 m³/h D) 0.3217 m³/h TO) 0.3619 m³/h
10 - What is the specific volume of air leaving a continuous flow adiabatic diffuser at 159°C and 100 kPa? a) 1.1532 m³/kg B) 0.4409 m³/kg NS) 0.4563 m³/kg D) 1.2398 m³/kg TO) 1.0532 m³/kg
s) 3) Consider a Pelton Turbine system. Two jets, they are exactly the same, strike the bucets of it. Pelton Wheel has a shaft power as 13500 kW. Each jet (other name nozzle) has a same diameter as 200 mm. Determine de overall efficiency of the Pelton Turbine if the net head is 400 m. (pw = 998 kg/m³)
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A heat exchanger enters 25 kg of water vapor per minute as saturated steam at a pressure of 800 kPa and gives heat to the surrounding air at constant pressure, all of which comes out as saturated liquid. Accordingly, what is the change in the entropy of water in unit time? a) -2.523 kW/K b) -1.923 kW/K c) -4.616 kW/K d) -0.978 kW/K (please can you help quickly) thank you everything
Air enters the engine of the aircraft with a mass flow rate of 50 kg/sec and with a speed of 250 m/sec. The air leaves the aircraft engine with a speed of 1200 m/sec. Determine the force (thrust) supplied to the engine? a)60000 N b)45000 N c)47500 N d)12500 N e)33300 N
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