Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 15SQ
To determine
Explain whether all the motors rotate in the same direction when it is connected to the appropriate phase sequences (L1, L2, and L3) to their appropriate terminals on the motor (T1, T2, and T3).
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i need answer in 20 min
Three shunt generators operating in parallel supply a total load current of 2000
amperes. Each machine has a field resistance of 40 ohms and an armature
resistance of 0.025 ohm. The emfs generated are 240, 245, 250 volts respectively.
Determine the current delivered by each generator.
Chapter 48 Solutions
Electric Motor Control
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- Question 1: Why is the voltage decresed at no-load operation? What is that voltage called? Question 2: Does the voltage increase with the increasing load? Why? Question 3: In which position the voltage decreased with the increasing load? Explain the reason. Question 4: Does the voltage change when a parallel rheostat is connected to the series excitation windings? Explain the reason. Question 5: Sketch the loading curve of the series generator depending on the values recorded.arrow_forwardWhich of the following is/are a general class of single-phase split-phase motor? a) resistance-start induction-run b) capacitor-start induction -run c) capacitor-start capacitor-run d) all of the above B)The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false C)The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above D)The voltages in a 3-phase power system are_____ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above E)Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"arrow_forwardTwo shunt generators are connected in parallel to supply a common load. Generator A has a power rating of 150KW and a voltage of 230 volt. Generator B has a rating of 250KW, 230 volts. Both generators has a no-load voltage 250 volts. Determine 1.) the power deliverd by each generator if the terminal value is 240V 2.) the total power received by the loadarrow_forward
- 16. What is the procedure for shunting down a generator ? (DC GENERATOR QUESTION)arrow_forwardQuestion 5:ls there any voltage drop when the generator is operating at no-load? Explain the reason. Question 6: State your final observations about the experiment.arrow_forwardFor shunt generator which kind of apparatus is used for adjusting the voltage.arrow_forward
- A 230V shunt generator has an armature circuit resistance of 0.05 ohms and shunt field resistance of 57.5 ohms. When the generator operates at rated voltage it has a total core and mechanical losses of 1880W. At what load does the generator operate so as to achieve maximum efficiency?arrow_forwardWhich of the following losses are significantly reduced by laminating the core of a D.C. generator? Windage losses Copper losses Eddy current losses Hysteresis lossesarrow_forward6 shunt generators are running in parallel in a curtain generating station. Each generator supplies a load current of 500 A at 220 V. The shunt field current of each generator is 5 A and the armature resistance of each machine is 0.05 ohm. If one generator is suddenly switched off determine the percentage change in terminal voltage, the total load current being kept uncharged. A: 3%-2%arrow_forward
- Two compound generators are operated in parallel. If generator A has a series-field resistance of 0.0015 ohm is adjusted to take 30 percent of the line load while generator B with a series field resistance of 0.001 ohm takes the remainder of the load, determine the current flow in the two series fields and the equalizer when the load is 230 kw at 230 volts.arrow_forwardC-1. Which of the two stator windings used on single-phase split-phase motors is made up of the larger wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b" C-2. Which of the two stator windings used on single-phase split-phase motors has the higher resistive value? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b" C-3.Which of the following circuit conditions would have the better power factor? a) a circuit with a relatively large amount of resistance b) a circuit with a relatively large amount of inductance c) they should both be the same. d) none of the above C-4.Which of the following circuit conditions would have the poorer power factor? a) a circuit with a relatively large amount of resistance b) a circuit with a relatively large amount of inductance c) they should both be the same. d) none of the abovearrow_forwardDraw a developed winding diagram for a dc machine with 4 poles,26 slots with 4 conductors per slot, duplex lap, double layerarrow_forward
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