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A listener increases his distance from a sound source by a factor of 4.11. Assuming that the source emits sound uniformly in all directions, what is the change in the sound intensity level in dB?
A 300 kW, 6600 V, 8-pole, 50 Hz, three-phase, Y-connected, non-salient pole (i.e., cylindrical rotor) synchronous motor has the following parameters: Xs = 72 ohm /phase at 50 Hz, R =10 ohm/phase for operation near base speed, and Efo = 3200 V/phase..
A photoelectric surface has a work function of 4eV. What is the maximum velocity of the photoelectrons emitted by light if frequency 10^15 Hz incident on the surface h = 6.6 * 10^-34 Joules-second e = 1.6 * 10^-19 Coulomb
an electric motor has an armture constant of 140, a flux of 25 mwh, an armuture current of 30 A , and a rotatio?nal speed of 1600 rpm. what is most nearly the power output in watt
An initially uncharged 2 microfarad capacitor is connected in series with a 10 k-ohm resistor and a 12 V battery. Find the charge and voltage on the capacitor after a very long time and find the voltage and charge on the capacitor after one time co..
Suppose host A and the DHCP server are separated by 2 kilometers and are connected by a direct link of R = 2 Mbps. Suppose the propagation speed over the link is 2.5×108 meters/sec. Neglecting the processing and queuing delays and assuming each pa..
Assume the temperature is 300K and mobilities are u_n = 1300 cm^2/Vs and u_p = 450 cm^2/Vs. a. What are the majority and minority carrier concentrations b. What is the resistivity of the sample c. What is the resistance (end-to-end) of the sample
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 at ..
B.) Write an equation for v(t) for t > 0 C.) Write an equation for the power absorbed by resistor for t >= 0 D.) Find how much energy the resistor disspates for t >= 0 E.) How much energy is stored in capacitor at t=0
The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity ?. Prior to rotation, each of the 0.44-kg sliding blocks has the position x = 22 mm with no force in its attached spring.
The power factor of a load connected to a 120-V 60-Hz source is raised from 0.866 lagging to 0.966 leading by connecting a 110.5-?F capacitor in parallel with the load. Determine the load current I1 and the circuit current IT.
A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 load. What is the efficiency of the transformer
A four-pole armature is to generate an average e.m.f. of 2.0V per conducter, the flux per pole being 25mWb. Calculate the speed, in r/min, at which the armature must rotate.
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