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A three-phase, 60-Hz transmission line has a total series impedance of 22.86 62.3° Ω per phase. It delivers 2.5 MW at 13.8 kV to a load connected to its receiving end. Compute the sending-end voltage, current, real power, and reactive power for the following conditions:
(a) 0.8 power factor lagging.
(b) Unity power factor.
(c) 0.9 power factor leading.
For the numerical values I = 10 A,N = 500 turns, g = 5 mm, a = 20 mm, b = 2 mm, and l = 40 mm, find the magnitude of the force. Assume infinite permeability of the core and neglect leakage.
Determine the fraction of load for which the efficiency is a maximum, and calculate the corresponding efficiencies for the power factors of unity, 0.8, and 0.6.
A black body of finite dimension at 1000K is inserted into an infinite medium at 300 K. Given Stefan Boltzman constant as 1.8*10-5 W/m2K4, the radiative heat transfer coefficient is ------
Consider the following information: i. The layer of dead skin on our bodies is sufficient to protect us from most -particle radiation. ii. Plutonium is an -particle producer. iii. The chemistry of Pu4 is similar to that of Fe3. iv. Pu oxidizes..
Calculate the molarity of each of these solutions. a. A 5.623-g sample of NaHCO3 is dissolved in enough water to make 250.0 mL of solution. b. A 184.6-mg sample of K2Cr2O7 is dissolved in enough water to make 500.0 mL of solution.
Then the monkey on the right begins to climb the rope while the monkey on the left simply holds on. When the right monkey has raised himself through height h(relative to the floor), what has been the change in the position of the left monkey?
If the machine is run as a motor while absorbing 10 kW from 230- V mains, find the speed of the motor. Neglect the brush-contact drop.
Calculate the tap pings k on a three-phase autotransformer to limit the starting current to 4 times the full load current. For such a limitation, determine the ratio of starting torque to full-load torque.
The diode's saturation current is given to be 10-12 A and the I-V curve is shown in Figure P7.2.6. Find the current through the diode in the circuit by graphical analysis.
Suppose you discover after the combustion has been carried out that the thermocouple is not functioning properly. Use the final pressure gauge reading of 75.3bar to estimate the adiabatic flame temperature of cyclopentane. Do not assume ideal gas ..
The average energy required to free an electron from the dynode surface is 10 eV. For each incident ectron released from rest, how many electrons are freed at the first dynode? At the last dynode?
Chemical X costs $0.09 per pound. Chemical Y costs $0.04 per pound. Chemical Z sells for $0.80 per pound. If one-half of the selling price for chemical Z is due to costs other than for raw materials, what is the maximum profit obtainable per pound..
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