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1. What are the values of the radiation resistance and the directivity for a half-wave dipole?
2. What is an antenna array?
3. Justify the approximations involved in the determination of the resultant field of an array of two antennas.
temperature can be measured by measuring the resistance of a length of wire since the resistance of many materials
Explain the concept of electric potential, chemical potential, and electrochemical potential and the differences among them.
Discuss the factors that determine transformer efficiency. What are some sources of transformer losses and how can these can be reduced
Two inductors with two separate cores are used in parallel in a circuit to share the current. A customer request a design improve by putting the two windings on to the same core. 1. Draw the two windings and resulting magnetic field; 2. If 10 turns..
A permanent magnet dc motor has two poles and a simplex lap winding of 18 loops and 3 turns per loop. The armature radius is 4 cm and the armature length is 15 cm. The flux density under the poles is 0.74 T.
Consider a portable 20cm2 fuel cell operating at 0.75V, 0.6 A/cm2. Suppose the stoichiometry of the anode is 2.0 and that of the cathode is 2.3. The fuel cell is expected to run for 3 days before being recharged.
Each of the four members of a "jukebox jury" is provided with a pushbutton; the button is pressed if the record played is a "hit" and is not pressed if the record played is a "miss". Design a digital logic system that lights a lamp
Find the Thevenin and Norton equivalent circuits for the circuit. Find the maximum power that this circuit can deliver to a load if the load can have any complex impedance. Repeat if the load must be purely resistive.
Determine the phase margin of the uncompensated and compensated system from the Nichols chart. (The graph on the left is uncompensated, the one on the right is compensated. What is the DC gain of the compensated closed loop system.
A 1φ, 440 V, 80 kW load, having a lagging power factor of0.8 is supplied through a feeder of impedence 0.6 + j1.6 Ω anda 1φ, 100 kVA, 220/440 V, 60 Hz transformer. The equivalent impedance of the transformer referred to the high-voltage side is 1...
Draw the state graph for a car wash controller which has 3 different kinds of washes a simple rinse-only wash, a rinse-soap-rinse wash, and a rinse-soap-rinse-blow dry wash. The first two of these wash types are the same as those in this chapter. Sta..
If the supply frequency is 50 Hz and the line current is 3 A determine (a) the phase voltage and (b) the line voltage.
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