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1. Discuss how the cutoff condition arises in a waveguide.
2. Explain the relationship between the cutoff wavelength and the spacing between the plates of a parallel-plate waveguide based on the phenomenon at cutoff.
The secondary's of a step-down, three-phase transformer bank are delta connected and supply a three-phase 240v moter that draws 12A through each line. What is the current in each transformer winding If the turn ratio of the transformers
Calculate vC, iC, and vR1 at 0.5 s and 1 s after the switch makes contact with position 1.- How much longer will it take for vC to drop to 10 V?
The total friction and core losses may be assumed to be constant at 403 Watts, independent of load. For a slip of 2% , compute the speed, output torque, and power and stator current, power factor and efficiency when the motor is operated at rated ..
(a) If the excitation volatge Eo is equal to the terminal voltage ( 4kv ), what is the maximum real power which the motor can deliver without losing synchronism (b) What is the rotor pole shift in electrical degrees
To calculate the decrease in bandwidth of a n-stage amplifier in comparison to a single-stage one, the -3 dB high and low frequencies are needed. Derive a formula for the low-frequency cutoff of a n-stage amplifier, if the single-stage low-frequen..
Calculate Cy at high temperatures (500 K) by using the quantum mechanical equation derived by Einstein. Assume an Einstein temperature of 250 K, and convince yourself that Cy approaches the classical value at high temperatures.
Determine the antenna current when the percentage of modulation changes to 0.8.
A transformer has its maximum efficiency of 0.98 at 20-kVA at unity power factor.
A uniform surface current density of Js(r) = Jo*sin(/phi)(/phi hat) A/m (Jo is a constant) is spread over a disc defined by 0
A stream of air at 80 °F and 1.2 atm absolute flowing at a rate of 200 ft3/h is blown through ducts that pass through the interior of a large industrial motor. The air emerges at 500 °F. Calculate the rate at which the air is removing heat generat..
a) Under equilibrium conditions and T>0 K what is the probability of an electron state being occupied if it is located at the Fermi level b) If Ef is positioned at Ec, determine numerically the probability of finding electrons in states Ec-kT
design a 3-bit synchronous counter (using only D-flip flops and NAND gates) that produces the sequence 000, 010, 011, 001, 101, 100, 000, etc. whenever the single input is 1. The counter retains its current value whenever the input bit is 0.
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