1.Calculate the work done by an engine for one stroke if the heat transferred out of the system is 300 kJ/kg of fluid. The internal energy is decreased by 900 kJ/kg. State whether the work is done on or by the fluid

1.Calculate the work done by an engine for one stroke if the heat transferred out of the system is 300 kJ/kg of fluid. The internal energy is decreased by 900 kJ/kg. State whether the work is done on or by the fluid

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter44: Four- And All-wheel Drive

Section: Chapter Questions

Problem 7RQ: When the plates of a viscous coupling (clutch) rotate at different speeds, the plates ____________...

See similar textbooks

Similar questions

A twin-engine jet aircraft is climbing at a 10 degree angle, measured from the vertical, at 260 ft/s. The thrust developed by an engine is 1000 lb. Calculate the power developed by the whole aircraft.
This is from Chapter 10 of Sustainable Energy second edition by Richard Dunlap Two locations have the same average wind velocity. Location A has a constant wind velocity of 10 m/s, while Location B has a wind velocity of 5 m/s for 12 hours per day and a wind velocity of 15 m/s for 12 hours per day. Compare the total energy produced per day for identical wind turbines at the two locations. The energy is given by the formula E = 0.5*(air density)*(efficiency)*velocity^3*(Turbine area)*time. Keep the answer in terms of (efficiency)*(Area). **Also is v average velocity or regular, non-average velocity?***
An engine developing 40 brake HP must be cooled by a radiator through which water is pumped from the engine. Calculate the required rate of flow in gpm if the heat transferred from the engine to cooling water = 40 HP, water temperature in radiator top water is 200 F and at bottom water is 190 F. One gal of water weighs 8.34 lb.
The volumetric efficiency of a certain piston pump is 97%. If the pump delivers 14 L/min at 1200 rpm, find the Volumetric displacement of the pump. A system requires a pump to deliver 30 gal/min at 1500 lbf/in2 at an engine speed of 2000 rpm. calculate theoretical pump displacement, engine torque to drive the unit, and horsepower. A piston pump operating at 1,150 rpm and 3000 Ibf/in2 delivers fluid at 10 gal/min. If the pump has an overall efficiency of 94%. What is the input torque from the driving unit? A pump operating at 2,000 Ibf/in? and delivering 5 gal/min requires 7 bhp to drive the input shaft. Compute the overall efficiency of the pump.
Consider an automobile with a mass of 5500 lbm braking to a stop from a speed of 55 miles/h.(a) How much energy (Btu) is dissipated as heat by the friction of the braking process?(b) Suppose that throughout the United States, 300,000,000 such braking processes occur in the course of a given day. Calculate the average rate (megawatts) at which energy is being dissipated by the resulting friction.(c) Find a source of information on the average per-capita consumption of electricity (kW) in the United States, France, and India. Roughly how many people in each country would have their electricity needs met if the braking energy calculated in Part (b) could be recovered and used to provide electricity? Show your calculations and identify your information source.
The average wind speed in a proposed wind farm with a horizontal axis wind turbine (HEWT) is 16.2 m/s. The power coefficient of each wind turbine is estimated at 0.462, and the combined efficiency of the gearbox and generator is 86.2%. When the wind velocity at a speed of 16.2 m/s, calculate the required diameter of the wind turbine (impeller or rotor) for each turbine, as it should produce 2.62 MW of electrical power from each turbine. Find the mass flow rate of the air passing over the wind turbine. Take the density of air 1.162 kg/m3. Since 30 turbines installed in the wind farm and a house in the area have an average electrical power consumption of about 1.62 kW, Calculate how many houses of the power requirement. that can be met? For calculation, take into account an additional efficiency of 96.2% for power transmission losses. Solve the problem by making the necessary assumptions and drawing the schematic figure.
1.calculate the pressure in a hydraulic system if the pump delivers 180 liters /min, and the engine has a power capacity of 75kw.2.The engine has a given capacity of 60kw, calculate the power requirement in a hydraulic system tool , to know that the engine is capable to support the hydraulic system if a pump delivers 110 liters per minute and the pressure is 227bar.
A 5-inch diameter centrifugal pump operating at 1000 RPM is geometrically similar to another 7.5 inch diameter pump when operating at 1400 RPM. The working fluid is water for both cases. Calculate the flow rate, head and brake power for the smaller pump if the flow rate, head and brake power for the largest diameter pump is 1000 gal/min, 50 ft and 15 hp respectively considering the point of operation previously described.
1.In the cylinder of an air motor, the compressed air at the beginning of an expansion cycle has an internal energy of 500 kJ/kg and after expansion an internal energy of 150 kJ/kg. Calculate the heat flow from or to the system, when the work done by the air during expansion is 200 kJ/kg 2. The heat loss in a certain non-flow process is 785 kJ. The internal energy increases by 522 kJ. How much work is being done? 3. In the compression stroke of an internal combustion engine the heat rejected to the cooling water is 45 kJ/kg and the work input is 90 kJ/kg. Calculate the change in specific internal energy of the working fluid stating whether it is a gain or a loss. 4.
You and your team are assigned to develop a huge hydroelectric power plant, as shown in Figure Q2b, to supply electric power to the residents. In the plant, 98 m3/s of water will flows from an elevation of 110 m to a turbine, where electric power is generated. The turbine employed in this plant having same inlet and outlet diameter, as well as an overall efficiency of 84 %. Unfortunately, friction is unavoidable when the water flow through the long piping system. In this regard, head loss in this plant is expected to be 21 m. Determine if this hydroelectric plant able to supply sufficient amount of electric power output if the desired electric power output to support the residents’ need is 75 MW.
1. A centrifugal pump delivers 300,000 liters per hour of water to a pressurized tank whose pressure is 280 kPa. The source of water is 5 meter below the pump. The diameter of the suction pipe is 300 mm and the discharge pipe is 250 mm. Calculate the kW rating of the driving motor assuming the pump efficiency to be 72%.
Wind at standard atmospheric pressure and 15°C temperature has a velocity of 20 m/s. The turbine has a diameter of 60 m and its operating speed is 50 rpm at maximum power coefficient (take CP=0.593). Calculate: a. The total power density in the wind stream (kW/m2) b. The maximum power density assuming overall efficiency = 40% c. The total power produced in kW assuming overall efficiency = 40%