Engineering, 01.10.2019 05:00 roseemariehunter12
Ay-connected balanced three-phase source is feeding a balanced three-phase load. the voltage and current of the source coil are = 325 sin( + 0.393) [v] = 22.6 sin( + 0.785) [a] calculate the following: a) the rms phase voltage. b) the rms line-to-line voltage. c) the rms current in the source. d) the rms current in the transmission line. e) the frequency of the supply. f) the power factor at the source side, state leading or lagging. g) the three-phase real power delivered to the load. h) the three-phase reactive power delivered to the load. i) if the load is connected in delta configuration, calculate the load impedance. j) in what regions of the world is this a typical residential voltage?
Answers: 3
Engineering, 04.07.2019 18:10
The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody
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Engineering, 04.07.2019 18:10
Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.
Answers: 1
Engineering, 04.07.2019 18:20
Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
Answers: 3
Engineering, 04.07.2019 18:20
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.
Answers: 2
Ay-connected balanced three-phase source is feeding a balanced three-phase load. the voltage and cur...
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