Question 4 It is required to design a squared, four stroke, twelve cylinder, and spark ignition engine to propel an airplane. The following data can be used to decide some of the engine parameters. The airplane Mach No 0.5 ambient conditions 0.54 bar, 255 K Thrust 5.5 KN The piston Engine Brake power 1000 kW bmep 10 bar Bsfc 0.26 (kg/hr)/kW f 0.05 Engine speed 3000 rpm Calculate 1. Propeller efficiency 2. Bore and stroke dimensions 3. Actual fuel and air consumption

in the picture given, moist air properties for an HVAC unit are seen. examine the numbers and explain why there is at least one value that is incorrect ( a value that doesn't make sense)

QUESTION 7 A model tow-tank test is conducted on a bare hull model at the model design speed in calm water. Determine the effective horsepower (hp) for the ship, including appendage and air resistances. The following parameters apply to the ship and model: Ship 1,100 Model Length (ft) Hull Wetted Surface Area (ft2) Speed (knots) 30 250,000 15 Freshwater Water Seawater 50°F 70°F Projected Transverse Area (ft²) Cair 7,500 0.875 Appendage Resistance (% of bare hull) 10% Hull Resistance (Ibf) 20

B) An engine with an indicated thermal efficiency of 50% and mechanical efficiency of 45% consumes 15kg/h of a fuel at a fixed speed. The brake mean effective pressure is 6.5 bar and the mean piston speed is 13m/s. Assuming it is a four cylinder four- stroke square engine, determine the crank radius and the speed in rpm. Take the heating value of the fuel =42MJ/kg and combustion efficiency 100%.

please dinot copy paste from other web i need urgent   A petrol engine produces 250 kW while using 1.014 kg of fuel per minute. The fuel has a lower heating value of 45000 kJ/kg, and the engine has bore of 100 mm and the stroke-to-bore ratio of 1.2. The clearance volume of the cylinder is 1.178×105 mm3. The friction power is found to be 10% of the power that engine produces. Sketch (your own) the simple neat and clean block diagram of the engine, clearly indicating the control volume and control surface, with all the given data displayed on it. For air take the value of g = 1.4. Determine the following: The brake thermal efficiency (hb, th ). The indicated thermal efficiency (hind,th ). The mechanical efficiency (hmech ). The brake engine efficiency (hb ). The indicated engine efficiency (hind ). (Hint: Engine efficiency is a function of how the ideal work or power is calculated. Frequently, the air-standard cycle is used for calculating the theoretical work.) Use standard symbols…

Q1/ Convert each of the following data: 1. 4.5 ft/s SI units (Km/h) U.S. Customary system of units (FPS) SI units kN/ m 2. 1500 N.S 3. 450 Ib/ft 4. 1.94 slug/ft 5. 45 MN/ 900 Gg. » SI units kN°kg

As a mechanical engineer, you were asked by your supervisor to monitor the operation of 4-stroke engine; as a result you got the following readings: > Imep = 780 kN/ m2 > Engine speed = 800 rpm > Brake Power 30 kW %3D %3D > nm = 85 % > B/S 0.7 You noticed also, that the inlet valve opens 10° before TDC and closes40° after BDC and it takes 0.0035 second after ignition for the charge to gain maximum pressure. Depending on the above readings, find the following engine parameters: a. The crank angle when the spark occursfor the maximum pressure to be at TDC b. The time period in second of inlet valve opening during one cycle c. The diameter of the engine d. The average piston speed 1 Upload file

1 The following observations are recorded during a test on a four-stroke petro engine, F.C = 25cc of fuel in 10 sec, speed of the engine is 2600 rpm, B.P = 22 kW, Qair 0.00134 m, piston diameter 90 mm, density of the fuel = 0.85gm/cc , compression ratio = 7.5, CV of fuel = 42000KJ/Kg, room temperature = 24 °C %3D = 140mm, stroke length = %3D %3D %3D 2 A six-cylinder 4-stroke cycle petrol engine is to be designed to develop 250 kW of (b.p) at 2200 rpm the stroke / bore ratio is to be 1.3:1. Assuming nm =80% and an indicated mean effective pressure of 9.5 bar, determine the required bore and stroke. If the compression ratio of the engine is to be 7.5 to 1, determine consumption of petrol in kg/h and in kg/bp.hr. Take the ratio of the indicated thermal efficiency of the engine to that of the constant volume air standard cycle as 0.65 and the calorific value of the petrol as; 44770KJ/kg.

1. An 8-cylinder, 4-stroke diesel engine was given a test for 30 minutes. The test results are as follows: Generator Rated Capacity 950 hp 91% Electrical efficiency Fuel quantity Fuel temp Air quantity Atmospheric temperature Exhaust gas temperature Cooling water quantity inlet temperature 30 gal 77 F with SG = 0.922 88600 ft³ 65 F 750 F 18000 ft³ 95 F outlet temperature 115 F Conduct an engine heat balance based on the above data.

OBB Occ ODD QUESTION 7 What is the entropy change for an energy reservoir at 700°C that transfers 1500KJ of heat to a heat engine? (5 Points) Please include your calculations in the PDE submission and mark your answer on Blackboard. QUESTION 8 Calculate the entropy change, in kJ/K, of 10 kg of silver when its temperature increases from 20°C to 100°C (cy of silver 0 235 kJkgk) (5 Points) Please include your calculations in the PDE submission and mark your answer.on Blackboard. QUESTION 9 An engineer claims that they designed a nozzle that increases the velocity of air flow from 50 m/s to 100 m/s. However, due to unforeseen issues, the exit velocity is measured as 75 m/s Find the isentropic efficiency of this nozzle. (5 Points) Please include your calculations in the PDF submission and mark your answer on Blackboard, QUESTION 10 Steam enters in an adiabatic turbine steadily at 4 MPa and 85% quality, Steam leaves the turbine as saturated vapor at 10°C If the mass flow rate of the steam is…