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A shunt-field dc machine has a field winding with Nf = 280 turns, all in series and wound on four poles. Each pole then has the same turns Nf/4. The winding has a current of If = 50.0 A. Each field pole has dimensions of 200 mm and 250 m. The air-gap length g = 5.00 mm. Calculate the magnetic field intensity H (hint: use Ampere's law), the flux density B, and the flux per pole f. Use the correct SI unit for each quantity. The iron parts have a permeability that is about 4000 fo, so the iron may be neglected in Ampere's law. Assume the flux under each field pole is uniformly distributed.
a cost to produce, P, of $4.00. If we were able to reduce this to $3.55 through greater attention in the design, and if the cost to improve the design (in NRE) is $35,000, how many units must we sell to recover the increased design cost
A 22-kw load is powered by a 68-hz, 480-V(subscript rms) line with a power factor of 0.8 lag . Calculate the parallel capacitance required to correct the power factor to 0.9 .
Two amplifiers are cascaded, one with a voltage gain of 6.02 db and the other with a voltage gain of 12. If 10 mV is measured at the input of the second amplifier, what is the voltage at the input of the first amplifier
Design a uniform ordinary end-fire array to have a half power bandwidth (HPBW) no greater than 100°, namely : i- find the number of elements N, take the inter-element spacing d=λ/8. ii- find the relative side lobe level.
Calculate the minimum value of Vd if the power flow through the converter is 5 kW (a) from the ac to the dc side and (b) from the dc to the ac side.
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
1.write down the electrical status equation for the circuit with serial connection of RLC- elements in vector form and darw diagram for this circuit. 2. Describe the work of electrical source in the voltage generator regime. and what is the working..
Basic boost converter that takes in 600VDC and boost the voltage to 900VDC with an output power of 8KW and a switch with a frequency of 250KHZ. One inductor one switch one capacitor and one resistor.
Each pole of a 100kW, 250v flet-compound generator has a shunt field of 2000 turns and a series field of 7 turns. If the total shunt field resistance is 100 ohms, calculate mmf when the machine operates at rated voltage.
An input signal x(t) = cosωct is sampled by an ideal sampling function with ωs= 1.5 ωc. The sampled signal is then filtered with an ideal low pass filter H(ω)= rect(ω/1,5ωc) to form an output signal y(t) a. Sketch the fourier transform of the sampl..
Suppose a car of mass m moving on a straight west-east highway at velocity v(t) (positive for motion from west to east) experiences aerodynamic drag force with magnitude v(t) opposing its motion.
a thermocouple is a heat-sensing device that typically outputs a signal in microvolts, such as 10 microvolts.if the signal transmitted to the controller needed to be 10 volts, what approximate amplification would the transmitter need to supply
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