Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 4, Problem 4.21P
To determine
The input torque applied to the shaft of the given generator in the Newton-meters and pound feet.
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The output of a shunt generator is 66A at 100V. Armature resistance is 0.04Ω and the field resistance is 25Ω. if the total efficiency at this load is 88%, determine the core and friction losses
A 10-pole DC generator has a simplex lap-wound armature containing 100 coils of 10 turns each. The resistance of each turn is 0.01 Ω.
1. If the flux per pole is 0.006 Wb and the rotational speed is 900 rpm, what is internally generated voltage of this generator in volts?
2. What is the internal resistance of the armature in ohms?
3. If this generator has flux per pole of 0.006 Wb, rotational speed of 500 rpm and is connected to a load resistance of 5 ohms, what is the current supplied by the generator in amperes?
a dc shunt generator has a generated emf 240v and a constant value of 8, if it is running at 1500 rpm, what is flux (in mwb) is being developed inside the machine?
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- The following questions refer to a 6-pole DC generator has a simplex lap-wound armature containing 288 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.006 Wb. a.How many parallel paths does the armature of the generator have? b.How many turns does each path have? c.What is the resistance of each path in ohms? d.What is the speed of the generator's prime mover in RPM if it is generating an output voltage of 230.4 V? please help me answer this correctly with solution so that I can study it. Thank you!arrow_forwardREVIEW QUESTIONS 1. If a self-excited generator has lost all of its residual magnetism, can it build up an output voltage? O Yes O No 2. How would you get a generator to work after it had lost all of its residual magnetism? 3. Does a generator slowly lose its residual magnetism with time? O Yes O Noarrow_forwardAn 10-pole d.c. generator has 585 armature conductors, and a useful flux of 46 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 960 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Eg Speedarrow_forward
- A 10-pole DC generator has a simplex lap-wound armature containing 100 coils of 10 turns each. The resistance of each turn is 0.01 Ω. Answer the following questions What is the number of conductors (Z) of the armature winding? What is the number of parallel paths of the armature winding? If the flux per pole is 0.006 Wb and the rotational speed is 950 rpm, what is internally generated voltage of this generator in volts? What is the internal resistance of the armature in ohms?arrow_forwardIn a 4 pole DC shunt generator with a shunt field resistance of 100 ohms and an armature resistance of 1 ohm has 378 wave connected conductors in its armature. The flux per pole is 0.02 Wb. If a load resistance of 10 ohms is connected across the load terminals and the generator is driven at 1000 rpm, calculate the power absorbed by the load.arrow_forwardDescribe the similarities in the construction of a DC motor and a DC generator. Please answer in short point wise and dont copy from other sources i will like ltarrow_forward
- An 6-pole d.c. generator has 290 armature conductors, and a useful flux of 12 mWb per pole. What will be the e.m.f. generated if it is lap- connected and runs at 1010 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Generated voltage speedarrow_forwardAn 6-pole d.c generator has 300 armature conductors, and a useful flux of 14 mWb per pole. What will be the em.f. generated if it is lap-connected and runs at 1420 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound?arrow_forwardAn 6-pole d.c. generator has 445 armature conductors, and a useful flux of 46 mWb per pole. What will be the e.m.f. generated if it is lap- connected and runs at 1400 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Eg Speedarrow_forward
- How does a generator play a crucial role in a power generation system?arrow_forwardIf a self-excited generator has lost all magnetism, can it build up an output voltage? Explain. of its residual Does a generator slowly lose its residual magnetism with time? How would you get a generator to work after it had lost all its residual magnetism?arrow_forwardAn 10-pole d.c. generator has 385 armature conductors, and a useful flux of 24 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 1440 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Generated voltage speedarrow_forward
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Working Principle of DC Motor (animation of elementary model); Author: chrvoje engineering;https://www.youtube.com/watch?v=j_F4limaHYI;License: Standard Youtube License