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A gasoline engine is converted to run on propane. Assume the propane enters the engine at 25?C, at the rate 40 kg/h. Only 90% theoretical air enters at 25?C such that 90% of the C burns to form CO2, and 10% of the C burns to form CO. The combustion products also include H2O, H2 and N2, exit the exhaust at 1000 K. Heat loss from the engine (primarily to the cooling water) is 120 kW. What is the power output of the engine? What is the thermal efficiency?
there are two machines available for cutting corks intended for use in wine bottles. the first produces corks with
To study the velocity profile of motor-oil flow in a circular pipe, it was proposed to conduct a test using water (instead of oil). The oil-conducting pipe diameter is 0.4 m and the expected average velocity is about 1.5 m/s. For the properties of th..
For a tall column resting on the ground, axial stress develops due to the columns weight. (a) Derive the stress as a function of position z measured from the bottom of the column, and the total contraction of the column.
a particle travels along a straight line such that in 2 s it moves from an initial position sa 0.5m to a position sb
a the vacancy formation energy in a particular metal is 0.5 ev. calculate the concentration of vacancies at 400 oc b
a spherical tank aisi 302 stainless steel has an outside diameter of 40cm and a wall thickness of 2cm. it contains
two kilograms of refrigerant134a initially at 2 bar and occupying a volume of 0.12 m3 undergoes a process at constant
A 255V shunt motor has an armature resistance of 0.245 Ohm and a field resistance of 124.9 Ohm. At no load (1200 r/min), the motor draws a current of 2.041 A. At full load, the motor draws 54 A. What's the motor's full load speed (in r/min)?
A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries steam at 4 MPa. Now the valve is opened, and steam is allowed to flow into the tank until the pressure reaches 4 MPa, at which point the va..
A pitching wedge a golfer is using gives the ball a initial angle of 50 degrees, what range of velocities (Vo) will cause the ball to land within 3 ft of the hole?
temperature varies with altitude. the variation in the temperature can be approximated by tt0 -beta z where t0 is the
the lowest temperature that has been achieved is about 1 times 10-6 k. to achieve this an additional stage of cooling
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