A 400V, 3-phase Induction motor has output of 32HP and operates at power factor of 0.75 lagging with an efficiency of 87%. Calculate the reading on each of the two wattmeter connected to measure the input. Find the following below: The value of  P1 is = The value of  P2 is =

A 12 V generator has an internal resistance of 0.05 ohm. Two loads are connected in parallel to its terminals, one drawing a 12 A current and the other dissipating energy at the rate of 200 W. What is the terminal voltage of the generator with this load? Ans. 0.82 volts

There are 72 slots in a 3-phase, 8-pole, 50 Hz, star connected alternator. There are 2 conductors in each slot and all the conductors in a phase are connected in series. Coil span is 150° electrical and the flux per pole is 0.05 Weber sinusoidally distributed. Calculate the emf induced per phase.

a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.8 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and o =30 degrees. Vp t= 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.8 ms b) Angular frequency =

(b) A 4-pole 3 phase alternator is driven at 1200 rpm. What is the frequency of the output voltage of the alternator? Explain how the same alternator can be used to generate voltage at 50 Hz.

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The output of the 3-phase, 400 V induction motor is 19 kW and operates at power factor of 0.9 lagging with an efficiency of 83%. Calculate the reading on each of the two wattmeter connected to measure the input.find The value of p1 is = The value of p2 is =

10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature coefficient at 15'C is equal to 1/254.5 per °C

A 1000 kVA, 6.6kV, 3-phase, star-connected alternator has a field resistance of 0.50 ohm per phase and an armature resistance of 0.05 ohm per phase. The field current at full load at 0.85 pf lagging is 200A. The stray power loss is 84KW. Calculate the efficiency at full load 0.90 pf lagging. use two decimal places if the answer is not exact and do not include the unit anymore.

An 8-pole alternator runs on 750 rpm and supplied power to a 6 pole induction motor which has a full load slip of 3%. Find the full load speed of the induction motor. Answer: 970 rpm