1. A 3-phase, 50-Hz, star-connected, 2,000 kVA, 2,300-V alternator gives a short-circuit current of 600 A for a certain field excitation. With the same excitation, the O.C. voltage was 900 V. The resistance between a pair of terminals was 0.12 ohms. The field loss is 8500 W, Iron loss = 9100 W, friction and windage loss = 7600 W Find full-load efficiency and regulation at (a)Unity p.f. (b) 0.8 p.f.lagging

Q: V at a frequency of 500 Hz. Determine the following: a. current b. power consumed and c. equation…

A:

Q: * Magnetic flux of D=0.0033 Wb induces 216 V in the phase of an induction motor stator winding with…

A: In this question we will find no of turns in winding....

Q: An rms ac voltmeter and a peak-to-peak-reading ac voltmeter are to be used to determine whether…

A: The given peak to peak reading should be converted into peak value and then convert it into RMS…

Q: in lab winding schemes, The-2 induced emf in a coil is emf in .coil for wave winding a) greater than…

A:

Q: A 3– phase 8 pole alternator having delta connected winding is supplying at a frequency of 50 Hz.…

A: Given a 3-phase alternator having delta connected winding with, Number of pole, P = 8 Frequency, f =…

Q: A 3-phase, 16 pole alternator has a wye connected armature winding with 144 slots, 10 conductors per…

A:

Q: Q1/ Calculate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors…

A: Eph = 4.44 kpkdϕf Tphkp = pitch factor = cos α2α -short pitch angle kd = Distribution factor = sin…

Q: QI/ Caleulate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors…

A:

Q: A long shunt d.c. compound generator delivers 110 kW at 220 V. If r = 0.01 ohm, r = 0.002 ohm, and…

A: We have been given an long shunt dc compound generator as shown in figure.  Given data, Voltage (V)…

Q: 8A (L 2A

A: In source transformation, one source works at a time. When 8 A is OC , 9 ohm and 3 ohm resistors…

Q: A three-phase generator is connected to three 90 Q load resistors. Each coil generates 120 V ac. A…

A: We need to tell the current value through the neutral line.

Q: The terminal voltage of an alternator changes with the increase in load due to voltage drop on…

A: Given that terminal voltage in a alternator  change with respect to.load  with respect to voltage…

Q: 8-pole 3-phase star-connected alternator with 144 grooves in its armature rotates at 900 rpm. There…

A: Given values are - P=8Phase=3GroovesSlotsS=144NS=900rpmConductors per groovesSlots=12Flux per…

Q: Q5) An alternator has 36 slots per pole. One coil lies in the slots number 1 and 31. Calculate the…

A: The question is about winding pitch.

Q: In alternators is rotating part. ............... Answer:

A: Alternators are basically AC generators. The main parts of an alternator are Stator, Rotor, Armature…

Q: In a series AC resistive circuit: O a) voltage leads current by 90°(degrees). b) current leads…

A: Option c Current and voltage are in phase

Q: 1. A load of 50 ohms resistance and 0.4 H inductance are connected in series to 100 volts, 60 hz a-c…

A: we have to calculate capacitance.

Q: An altemator is required to generate a line voltage of 415 V on an open circuit. If the machine is a…

A: Given,  An 3 phase star connected alternator has, Line to line generated voltage (EL)=415 Volts…

Q: circuit connection diagram on how to synchronize an alternator to the grid using lab volt. using…

A: The purpose of the synchronization is to ensure that during the circuit breaker closure (closing the…

Q: The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9…

A: We will find the pitch factor in each case as shown below.

Q: The rotating part in an alternator is ................

A: Alternator converts mechanical energy into electrical energy.

Q: A 3-phase,50Hz, 4-pole, Y-connected alternator has 6 slots per pole per phase. The armature has…

A:

Q: What are the main effects of losses on the performance of the alternator?

A: There are various effects of losses on the performance of alternator. To calculate the efficiency of…

Q: EXPLAIN BRIEFLY THE SYCHRONOUS ALTERNATOR WHEN OPERATING AT NO LOAD

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Q: Calculate the speed and open-circuit line and phase voltages of a 4-pole, 3phase, 50 Hz star-…

A:

Q: In induction type energy meter, load current I produces an alternating flux f1. In this case l, is…

A: Current and flux are in phase .here pase difference is zero degrees

Q: Q1/ Calculate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors…

A:

Q: Make a general statement on the effect of increasing excitation to the power factor of the…

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Q: n 8.2kW seriesd generator has an armature resistance is 0.25 ohms with a generated voltage equal to…

A: The above question is based on the DC generator. The major classification of DC generators is as…

Q: Fae number of parallel paths and the number of series conductrs required for a given kW reting are…

A: Number of parallel path and number of series conductor are required to?

Q: The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9…

A: pitch factor can be calculated using the following relation Pitch factor = cos(alpha) / 2

Q: A 4-pole DC generator runs at 650 rpm and generates an EMF of 200 V. The armature is wave wound and…

A: Given data, Number of poles P = 4 Speed of motor N = 650 rpm EMF E = 200 V Wave winding A =2 Number…

Q: he power supplied to a three-phase induction motor is 20KW and the stator losses are 1000W. If ¤ ip…

A: Power input = 20kW Stator losses = 10000W If the slip =4% then copper losses?

Q: Ru 10 V ms RL 3.3k 100 µF alle

A: Given V2rms = 26 V Frequency F = 60 Hz To find Vdc o/p PIV

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.