Electrical Transformers and Rotating Machines
Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 21, Problem 10RQ
To determine

The size of conductor for the branch circuit supply.

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1. Two compound generators are operated in parallel. If generator A has a series-field resistance of 0.0015 ohm and is adjusted to take 20 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 250 kw at 230 volts.
Question 4 A 228 V/ 111 V single-phase transformer has a core loss of 110 W and the no-load current is 0.7 A. The no load power factor is Not yet answered Marked out of O 0.99 1.00 O 1.42 P Flag question O 0.48 O 0.69 Question 5 A 2 kV / 229 V transformer has the secondary turns of 47. The number of Primary turns of a transformer is given by, Not yet answered 63.83 Marked out of 410.48 1.00 O 615.72 P Flag question O 5381.50 Question 6 For the given power transfer, a delta system is associated with larger line currents and a star system is associated with a larger line voltage. Not yet answered Select one: Marked out of O True 1.00 P Flag question O False
Two shunt generators 1 and 2 are operating in parallel. The voltage of generator 1 falls from 240 V at no-load to 220 V at 200 A, while that of generator 2 falls from 245 V at no-load to 220 at 150 A. Determine the current which each generator supplies to n common load of 300 A and the bus-bar voltage at this load. The load characteristics of the generators may be taken as straight lines.
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