PROBLEM 5 What is the pitch factor of a 14 pole alternator that has an armature with 378 slots. The armature is wound with coils spanning 23 slots. ANSWER:
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- The direct axis and quadrature axis reactances of a salient pole alternator are 1.4 per unit and 1.1 per unit respectively the armature resistance is negligible. If the alternator is operating at rated condition at unity power factor then estimate its power angle fast please fast in 10 minutesProblem: A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 Ω, 156 Ω, and 0.465 Ω respectively. If it supplies a load of 9 kW at a terminal voltage of 241 V, calculate the generated emf in volt. *Four decimal places3-phase,50 Hz, delta connected generator, its stator winding having 12 slots per pole pair and 6 conductors in each, if the total air gap flux is 160mwb. Find the terminal voltage. The prime mover speed is 750rpm.
- If Radj can be adjusted as shown, what is the maximum no-load terminal voltage of this generator in volts? What is the setting of Radj in ohms if the generator is operating at its rated conditions (Output power Pout = 10 kW & Terminal voltage VT= 100 V)? (Answer in 2 decimal places)A short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder and series field resistance 0.10 ohm. Armature resistance, shunt field resistance and series field resistance are 0.01 ohm, 52.2 ohms and 0.10 ohm, respectively. If the core friction and windage losses amount to 631 watts, the BHP of the driving engine is nearest toA three-phase alternator, 20 kV, synchronous has a reactance of 10Ω and a negligible resistance. The machine draws an armature current of 150A, 0.80 pf lagging. If the steam admission is constant and field current isadjusted raising the induced emf by 25 %, find the new armature current.
- A 54-slot stator of a synchronous generator is wound for three-phase, 50-Hz, 6-pole applications. Determine (a) the number of coils in a phase group, (b) the slots per pole, (c) the slot span, (d) the coil span, and (e) the speed at which the rotor must be rotated.Q. A 3-phase, star connected, 10 kVA, 400 V, salient pole alternator with direct and quadrature axis reactances of 15 ohm and 8 ohm respectively, delivers full-load current at 0.8 power factor lagging.Neglect the armature resistance. Solve this question to chose the correct answer for the following: Alternator no load voltageProblem: The field current of a 100-kW, 250V shunt generator is 5A when delivering power at rated terminal voltage and rated load current. The combined armature and brush resistance is 0.1 ohm. 1.)Calculate the generated power in kW. 2.)What is the electrical efficiency? * Formatt: given required solution answer
- In a 110 V compound generator, the resistance of armature, shunt and series field winding are 0.06 Ω, 25 Ω and 0.04 Ω respectively. The load consists of 100 lamps, each rated as 55 W at 110 V. Find the total electromotive force and armature current when the machine is connected as (i) long shunt and (ii) short shunt.The result of no-load test on a 3-phase Y-connected induction motor are as follows: line to line voltage =400v; input power= 1770W; input current =18.5A; friction and windage loss = 600W. Determine:1. resistance per phase representing the core loss2. the magnetizing reactance per phase of the core.The synchronous reactance of the direct-axis and quadrature-axis of a three-phase,40-pole, 50 Hz, 13,8 kV, salient-pole synchronous generator is 2,38 Ω and 1,33 Ωrespectively. The resistance of the star-connected stator is negligible. The load angle ofthe machine is 30°e and the excitation is set to induce an emf of 167%. Sketch the phasordiagram and calculate:(a) current(b) power(c) reluctance torque(d) the maximum load angle(e) the maximum power developed