Learn more about our help with Assignments: Engineering
Search
Mechanical Engineering
The radiation shape factor of the circular surface of a thin hollow cylinder of 10 cm diameter and 10 cm length is 0.1716. What is the shape factor of the curved surface of the cylinder with respect to itself?
Mechanical Engineering
A 39 kW delta-connected motor with a lagging power factor of 0,85 is supplied by a threephase star-connected alternator having a line output of 380 V at 50 Hz. The motor has an efficiency of 78 %. Calculate the phase currents for the load and the alternator. Determine the new line current of the motor, if the supply frequency is changed to 60 Hz
Electrical Engineering
Two 12-V batteries with internal resistance of 0.20 ohms and 0.25 ohms respectively are joined in parallel and a resistor of 1.0 ohms resistor is placed across the terminals. Find the current ?
Electrical Engineering
A battery of 10 volts emf and points internal resistance of 0.50 ohms is connected in parallel with another battery of 12 volts and internal resistance of 0.80 ohms. The terminals are connected to an external load resistance of 20 ohms. What is the load current?
Mechanical Engineering
Two parallel rectangular surfaces 1m x 2m are opposite to each other at a distance of 4 m. The surfaces are black and at 100 °C and 200 °C, respectively. Calculate the heat exchange by radiation between the two surfaces.
Electrical Engineering
Three resistors A, B and C are connected in parallel and take a total of 7.9 amp. Resistor A takes 2.5 amp and has a resistance of 48 ohms; also, the current through B is twice as much as that through C. Calculate (a) la and Ic, (b) the line voltage and (c) Rs and Rc.
Mechanical Engineering
A 12-by-12 in. open pan containing water at 140 °F is placed in the exact center of a 16-by-20 ft room having a ceiling temperature of 75°F. If the distance from the water surface to the ceiling is 10 ft and the ceiling is painted with an oil paint, what is the net radiant-heat exchange between the water surface and the ceiling?
Mechanical Engineering
A horizontal metal plate which is completely insulated except for one exposed surface of 100 sq. ft. is heated electrically to maintain a temperature of 200 °F on the exposed surface. Heat is transferred from this surface by both radiation and conduction through air (assumed to be without motion) to a second plate of similar size maintained at a surface temperature of 100 °F. The distance between the parallel plates is 0.25-in., and each plate has an imissivity of 0.20. What is the watts input to the warmer plate?
Mechanical Engineering
Determine net radiant-heat exchange between the closed ends of a hollow cylinder 12-in. in diameter and 4-in. long. The ends are of Cr-Ni alloy with one end heated electrically to a temperature of 1900 °F and the other end maintained at 125 °F. The side wall of the cylinder is substantially nonconducting and reradiating.
Mechanical Engineering
A 6-in bare oxidized steel pipe (6.625 in O.D) carries steam at a temperature of 540°F and is loacted in a large room having wall temperatures of 80 °F. Determine the net radiant-heat exchange in BTU/(hr)(ft) between the pipe and the room, (a) if the surface temperature of the pipe is assumed to be the same as the steam temperature; (b) if the pipe is covered with a single layer of asbestos paper and the temperature of the outer surface of the paper is 530 °F; (c) if the asbestos paper painted with aluminum paint containing 26 percent aluminum and the surface temperature is 530 °F.
Finding a professional expert in "partial differential equations" in the advanced level is difficult.
You can find this expert in "Assignmentexpert.com" with confidence.
Exceptional experts! I appreciate your help. God bless you!
#340153 on Dec 2023
#340153 on Dec 2023