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Suppose that we are designing a 1200-rpmdc motor to run from a 240-V source. We have determined that the flux density will be 1 T because smaller fluxes make inefficient use of the iron and larger fluxes result in saturation. The radius of the rotor (and thus, the torque arm for the armature conductors) is 0.1 m. The lengths of the armature conductors are 0.3m. Approximately how many armature conductors must be placed in series in this machine?
There are approximately 109 million TVs in the United States. Each uses, on average, 79 W of power and is turned on for 6.9 hours a day. If electrical energy costs 0.073 dollars per kWh, how much money is spent every day in keeping the TVs turned ..
At 2GHz, a certain material has εr=2.5,μr=1, tanθ=10-2. Calculate the distance a uniform plane wave can travel through the materialbefore a) its amplitude is reduced by 20%, b) the phase shiftsby 180 degrees, c) the power is reduced by 10%.
A family selects two phones from a box containing cellphones: four are Nokia, marked N1, N2, N3, and N4. The other three are Samsung, marked S1, S2, and S3. Two phones are picked randomly in succession without replacement.
Find the Thevenin's Equivalent Circuit between terminals a and b in the circuit
When attached to adirect current supply of 120V. What value of current does each bulb draw What is the total current drawn by the bulbs If one bulb burns out, does the current through eachremaining bulb increase, decrease or remain the same
A 10kVA, 200/400V 50Hz single-phase transformer gave the following test results. O/C test: 200V, 1.3A, 120W, on l.v. side. S/C test: 22V, 30A, 200W on h.v. side. (a) Calculate the magnetizing current and the component corresponding to core loss
The amount of sunshine on a horizontal surface at the equator is 5kWh/m2/day. Suppose a house is to run entirely off grid on solar electricity alone using a high performance silicon photovoltaic module with specifications shown below: Maximum powe..
The two-phase source produces currents given by ia(t) = Im cos( t) and ib(t) = Im cos( ωt- 90° ). Show that the total field rotates. Determine the speed and direction of rotation. Also find the maximum flux density of the rotating field in terms o..
Assume all that youhave a single 1nF capacitor, any number of op amps,and any numberof resistors. Design a circuit that has a port impedance of1uF.
1. If x(t) is periodic with period 2.1 seconds and y(t) is periodic with period 2.4 seconds, is x(t)+y(t) periodic Why or why not 2. If x[n] is periodic with period 15 seconds and y[n] is periodic with period 10 seconds, is x[n]+y[n] periodic
A 60-Hz, single phase source with V= 277 at angle 30 degree volts is applied to a circuit element. Determine the instanaeous power, real power, and reactive power absorbed by determine the source power factor and state lagging or leading.
(a) Determine free electron and hole concentration.(b) Calculate the effective density of states at valence band, Nv. Given that ni = 1x1010 cm3 and kT = 0.026.
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