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An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25cm X 25cm square aluminum plate and blowing air at 35 C over the plate with a fan at a velocity of 4m/s. The average temperature of the plate is not to exceed 65 C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate.
piston and flywheelconsider the one-cylinder four-stroke engine assembly shown in figure 1. the mass of the piston p is
a household refrigerator with a cop of 1.8 removes heat from the refrigerator space at a rate of 90 kjmin. determine
determine the maximum pressure across a 10 hp pump that has an inlet diameter of 1.0 inches and velocity of 10 fps. the
a mass of 5 lbm is released when it is just in contact with a spring of stiffness 25 lbfft that is attached to the
a linear bearing supports a load w has a contact area a and travels at a maximum velocity v. what expression will be
Starting from the energy equation and using the one-dimensional heat conduction derivation as an example
1. steam is supplied dry saturated at 40 bar to a turbine and the condenser pressure is 0.035 bar. if the plant
20 kg of water at 200 kpa with a quality 25 is heated under a constant volume process until its pressure reaches 400
If the maximum temperature in the cycle is not to exceed 2200 K, determine the thermal efficiency and the mean effective pressure.
what is the difference between ideal materials and real materials? is there a difference in strength and why do we see
a heat pump with refrigerant-134a as the working fluid is used to keep a space at 25degc by absorbing heat from
an object whose mass is 50 lb attached to a rope wound around a pulley. the radius of the pulley is 3 in. if the mass
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