Principles and Applications of Electrical Engineering
6th Edition
ISBN: 9780073529592
Author: Giorgio Rizzoni Professor of Mechanical Engineering, James A. Kearns Dr.
Publisher: McGraw-Hill Education
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Discussion:-
1. What do you understand by "armature- reaction"? Discuss the effect of armature
reaction in an alternator when it is loaded with resistive, inductive and capacitive
loads.
2. Give the value of voltage regulation for different power factors at full load current
and interpret their values.
8 If we model each winding of a three-phase motor
like the circuit shown in Figure P7.68(a) and connect
the windings as shown in Figure P7.68(b), we have the
three-phase circuit shown in Figure P7.68 (c). The
motor can be constructed so that R1 =R2 = R3 and
L1 = L2 = L3, as is the usual case. If we connect the
motor as shown in Figure P7.68(c), find the currents
ÎR, İw, İg, and În, assuming that the resistances are
40 2 each and each inductance is 5 mH. The frequency
of each of the sources is 60 Hz.
Q9. What is the basic principle that a cage winding can be represented by a three-phase winding?
Give your explanation.
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- 2. The below figure shows the results of magnetic particles inspection experiment. What can you conclude from it? d) Discuss which hysteresis is better to be used with the AC generator in the airplane. e) In general, describe the structural, elasticity and electrical properties of copper and the PVC insulator (polymeric) with reference to their material properties. f) How metals and non-metals (ceramics and polymers) could be degraded?arrow_forwardTwo identical 2,000 kW alternator operates in parallel. The governor of the first machine is such that the frequency drops uniformly from 50 Hz at no-load to 48 Hz at full-load. The corresponding uniform speed drop of the second machine is 50 Hz to 47.5 Hz. What is the maximum load that can be delivered without overloading either machine?arrow_forwardTwo 60MVA, alternators operate in parallel. The setting of the governor are such that the rise in speed from full load to no load is 2% in one machine and 3% in the other, the characteristics being straight lines in both cases. If each machine is fully loaded when the total load is 120MW, what will be the load on the first machine (with 2% speed regulation) when the total load is reduced to 80MW?arrow_forward
- 5. Two shunt generators A and B operate in parallel and their load characteristics may be taken as straight lines. The voltage of A falls from 240 V at no-load to 220 V at 200 A, while that of B falls from 245 V at no-load to 220 V at 150 A. Determine the current which each machine supplies to a common load of 300 A and the bus-bar voltage at this load.arrow_forwardIn 2-pole machines: the wave winding have greater generated voltage than *.the lap winding armatures True False *.For high rotating speed machines the number of poles must be Little True False The reactance voltage is added in the coil undergoing commutation to * reduce the spark True Falsearrow_forwardA 1200 kW,60 Hz synchronous alternator A identical governor droop of 0.0005 Hz/kW.Machine A takes two third of 1000kW bus load at 60 Hz.lf an additional 800 kW load is connected to the bus determine (a) bus frequency (b) load on each machine. is in parallel with a 400 kW,60 Hz alternator B.Both machines have (a) 58.6 Hz (b) 566.67 kW, 433.33 kW. (a) 59.6 Hz (b) 866.67 kW, 133.33 kW (a) 59.8 Hz (b) 666.67 kW, 333.33 kW (a) 58.9 Hz (b) 766.67 kW, 233.33 kWarrow_forward
- Two identical 20 MW three-phase alternators operate in parallel. The governor of first machine is such that the frequency drops uniformly from 50 Hz on no-load to 48 Hz on full load. The corresponding uniform speed drop of the second machine is from 50 Hz to 47.5 Hz. How will the two machines share a load of 30 MW?arrow_forwardDC generator characteristics Please answer and thank you with all my heart...arrow_forwardHow does reactive power compensation improve the efficiency of power transmission?arrow_forward
- The solution is largely correct but for a few errors.. Also note that the generator is represented by a voltage source and an impedance in series. Likewise the motor.please taking into consideration the following comment can you please resolve the questionarrow_forwardIn a Three-phase alternator, a given field current produces an armature current of 250 A on short-circuit and a generated e.m.f. of 1500 V on open-circuit. Calculate the terminal p.d. when a load of 250 A at 6.6 kV and 0.8 p.f. lagging is switched off. Calculate also the regulation of the alternator at the given load. Subject: Electrical engineeringarrow_forwardWhat is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generatorarrow_forward
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