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1. The pole faces of a magnet are 4 cm 3 cm and produce a flux of 0.5 mWb. Calculate the flux density.
2. A flux density of 1.8 T exists in an air gap of effective csa 11 cm2. Calculate the value of the flux.
3. If a flux of 5 mWb has a density of 1.25 T, determine the csa of the field.
a sinusoidal voltage has a peak value of 15V, a frequency of 500Hz, and crosses zero with a positive slope at t=0.1 ms. write an expression for the voltage using a cosine function in terms of t and constant pi.
Draw the developed diagram and show the positions of brushes.
A 9-kVA, 208 V, 1200-rpm, three phase, 60 Hz, Y- connected, Synchronous generator has field winding resistance of 4.5ohm. The armature winding impedance is 0.3+j5 ohms per phase. When the generator operates at its full load and 0.8 lagging
Give three of the fault conditions handled by the signaling network management.
A 20kW, 250V, self-excited dc shunt generator is driven at its rated speed of 1200rpm and it is delivering rated power at rated terminal voltage. Its armature-circuit resistance is 0.15-ohm, and the field current is 2 A.
A 20-KΩ / V voltmeter reads 10 V full scale. (a) What series resistance is required to make the meter read50 V full scale (b) What power will the series resistor dissipate when themeter reads full scale
Using the right-hand rule, we know the magnetic field at the top of the arc is into the page and the magnetic field at the bottom of the arc is out of the page.
In addition, assume that your house is the only one using electric power. At a substation the primary of a step-down transformer (turns ratio = 1:26) receives the voltage from the high-voltage transmission line.
Why is pulse shaping filtering indispensable in wireless communications applications. Give three reasons why pulse shaping filters are used and in what points of the communications link they may be deployed.
Suppose we have three 6-H inductances. What is the maximum inductance that can be obtained by connecting all of the inductances in series and/or parallel? What is the minimum inductance?
Given a used area of 2016 ft2 and unused area of 2000ft2, (a) find the minimum number of 25-amper lighting branch circuits required for residence, (b) how many outlets are permitted on a lighting branch circuit
Design the input and output matching circuits using the given large-signal reflection coefficients. Compute the required input power level.
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