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1.A 220 V, 3-phase, 4-pole, 50 Hz inductor motor of wound rotor type is supplied at ratedvoltage and frequency. The stator resistance, magnetizing reactance, and core loss arenegligible. The maximum torque produced by the rotor is 225% of full load torque and itoccurs at 15% slip. The actual rotor resistance is0.03 / phase. ?The value of externalresistance (in Ohm) which must be inserted in a rotor phase if the maximum torque is tooccur at start
Titan has numerous hydrocarbon lakes containing a mix of methane and ethane in unknown proportions. A small submersible vehicle will exlpore Kraken Mare, the largest lake.
a second instrument is required to measure the input signals up to 100Mz with an amplitude inaccuracy of less than 1% calculate the natural frequency requirements, if the damping retios are 0.3 and 0.6 respectively.
Two parallel connected 10 kV to 120 V 60 Hz single phase transformers supply a varying load. When the total secondary load current is 250 A at 0.85 PF lagging, determine the secondary current and operating PF of each transformer.
show that if n=4, a cell can be split into four smaller cells, each with half the radius and 1/16 of the transmitter power of the original cell. If extensive measurements show that the path loss exponent is three
From what distance must the electron be red if it is to just fail to strike the plate?
An AM transmitter radiates 9 kW of power when the carrier is unmodulated and 10.125 kW when the carrier is sinusoidally modulated. Find the modulation index, percentage of modulation.
Explain why the low value (0) for the 'output' of a digital logic gate is lower than the low value for the 'input' of a digital logic gate (This is the case for CMOS and Bipolar logic). Look at a specsheet.
Extension cords which are designed to carry heavier loads are generally larger in diameter than those which are not. Is this just a matter of adding more insulation, or is there a physical principle at work causing the larger diameter? Explain.
At the point you can check a point or two on the V-I curve and confirm that the plot is equivalent to the linear plot in Part 1. Describe a specific measured point on the curve and what it represents.
how many bits are required to represent the decimal numbers in the range from 0 to 999 using straight binary code?
Heat is added until the final volume is twice the initial volume. Assume that Helium behaves as an ideal gas. Use the table provided to determine the specific heats of helium and determine the following.
A balanced delta connected load of 15 + j18 ohms per phase is connected at the end of a three-phase line. The line impedance is 1 + j2 ohms per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 V rms.
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