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1) A 25KW, 250V dc shunt generator has armature and field resistances of 0.06 ohm and 100 ohm respectively, determine the total armature power developed when working (1) as a generator delivering 25KW output and (2) as a motor taking 25KW.
2) A 250v 4 pole wave wound dc series motor has 782 conductors on its armature. It has armature and series field resistance of 0.75 Ohm (armature + series winding). The motor takes a current of 40A. estimate its speed and gross torque developed if it has a flux per pole of 25mWb.
1. A sinusoidal waveform is described by the equation: v(t) = 20V sin(120pit) pi = 3.1416 What is the value of the frequency 2. A sinusoidal waveform is described by the equation
A three-phase substation transformer operating at 34.5kV is loaded to 24 MVA. What is the per-phase current? (assume balanced conditions)
The One river Hydroelectric Project generated power for BPA along the Two River from the early 1800s until 1900, when it was decommissioned due to environmental issues. The maximum flow rate through the system was 25 m3/s, and the hydraulic head w..
If you were the operator for an squirrel cage induction machine, what options could you consider to control speed Describe and mention pluses and minuses of each.
Discuss why phasor analysis can only be performed on single-frequency circuits. For multiple frequencies what type of analysis must be performed Discuss the advantages of transforming time-domain circuits into the corresponding frequency domain.
A three-phase transmission line having a reactance of 120 ohms per phase is connected to a wye-connected load whose resistance is 160 ohms per phase. If the supply volatge is 70kV line-to-line, calculate a) The line-to-neutral voltage per phase.
A 35-year old female worker receives an x-ray exposure of 5.2 rad (whole-body) while carrying out emergency procedures in a nuclear accident. Discuss the health risks assumed by this worker as a result of the radiation exposure.
BJT Amplifiers Sketch an emitter-follower circuit with R1 = R2 = 50kohm ; RE = 2kohm. The collector of the npn transistor is connected to VCC = 5V and the input signal has an internal resistance, RS = 0.5kohm
A telephone switching board can handle 120 phones. Assuming the following, and determine the outgoing traffic intensity and the number of channels
Power Systems Theory Definitions and Formulas, Define, (a) The fault level of a system or unit in a system, (b) base MVA
You are working with a design team on a new product and are assigned to design the power supply. The requirements for the power supply are as follows: Input AC: 115 V AC +- 10%, 50-60 Hz Outputs: +5 V DC at 100 ma, +-12 V DC at 50 ma
Draw the positive, negative, and zero sequence networks for the system. Include all impedance values and determine the bus voltages at midnight? What problem(s) do you detect?
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