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A hot fluid passes through a thin-walled tube of 10-mm diameter and 1-m length and a coolant at T8 = 25°C is in cross flow over the tube. When the flow rate is m = 18 kg/h and the inlet temperature is Tm,j = 85°C, the outlet temperature is Tm,o = 78°C. Assuming fully developed flow and thermal conditions in the tube, determine the outlet temperature, Tm,o, if the flow rate is increased by a factor of 2. That is, m = 36 kg/h, with all other conditions the same. The thermo physical properties of the hot fluid are p = 1079 kg/m3, cp = 2637 J/kg · K, µ = 0.0034 N · s/m2, and k = 0.261 W/m · K.
a)How many holes are in the valence band b)If electrons are constantly seeking lower energies and recombining with holes then how can the number of 10billion remain constant.
Design and sketch a band pass filter consisting of an RC high-pass filter with a cutoff frequency of 300 Hz and an RC low-pass filter with a cutoff frequency of 700 Hz. Carefully select the R and C of each filter so that one filter does not load t..
A balanced, 3-phase, 3-wire, 60Hz, wye-connected source isserving a combination of balanced loads in various configurations.Measurement of the source line voltage indicates 480 voltsline-to-line. Measurement of the source line current indicates 23..
A Y-connected load has an impedance of 25+j12 ohms in each phase. It is desired to raise the load power factor to .95 lagging. (a) What size capacitor should be placed in parallel with each phase impedance if frequence = 60 Hz
Two identical 138 kV Y: 13.8 kV DELTA 100 MVA tap changing transformer each with a per unit series impedance of j.1 ohms are operating in parallel and supplying a 180 MVA load at 13.8 kV and .8 lagging pf.
(1) What happens if we connect an integrator and a diffetentiator together in series. What do we get. 2) Explain what is meant by 1nV/rtHz. What is the meaning of this specification.
two charges of equal magnitude 5x10-9 but opposite charge are separated by a distance of 10 meters. Determine the net force on a positive charge q =2x10-9, that is midway between the two charges.
A four-pole, 450-kW, 4.6-kV SHUNT GENERATOR HAS ARMATURE AND FIELD RESISTANCES OF 2 AND 333 Ohms. The generator is operating at the rated speed of 3,600 r/min.
A circular polarized wave in air is incident on glass surface. The angle of incidence equals the Brewster angle. Refractive index of glass, n(glass) is 1.35. Find the following quantities: 1) The Brewster angle. 2) The angle of refraction 2.
When a type of integrated circuit is tested at 185 degrees Celcius, 10% of the circuits fail within two weeks with VDD = 1.0V. Estimate the 10% lifetime at 95 degrees Celcius and 1.0V assuming Ea = 1.0eV.
Convert the decimal number 431 to binary in 2 ways:(a) convertdirectly to binary; (b) convent first to hexadecimal and then from hexadecimal to binary. which method is faster.
A 480 V permanent magnet ae motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 W per phase. Core losses are 100 W. Mechanical losses arc 250 W.
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