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The field current of a separately-excited dc motor operating with a fixed armature voltage and a fixed mechanical load is changed. This causes the speed to increase. The field current has been: Select one: O a. This is not possible because the speed is independent of the field current. Ob. decreased. O c. increased. O d. None of the above.

The field current of a separately-excited dc motor operating with a fixed armature voltage and a fixed mechanical load is changed. This causes the speed to increase. The field current has been: Select one: O a. This is not possible because the speed is independent of the field current. Ob. decreased. O c. increased. O d. None of the above.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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The field current of a separately-excited dc motor operating with a fixed armature voltage and a fixed mechanical load is changed. This causes the speed to increase. The field current has been: Select one: O a. This is not possible because the speed is independent of the field current. O b. decreased. O. increased. O d. None of the above. A single phase transformer is rated at 10KVA, 220/108. If a load resistance 1.5 ohm is connected across 108 V winding, calculate the transformer efficiency (in percent) if the total losses in the transformer is 2746W? Answer: Synchronous generator will produce sufficient electrical power output if it is given: Select one: O a. Ac current. O b. Mechanical power input and dc field current. O. Mechanical power input only. O d. Mechanical power input and Ac filed current.
Transcribed Image Text:The field current of a separately-excited dc motor operating with a fixed armature voltage and a fixed mechanical load is changed. This causes the speed to increase. The field current has been: Select one: O a. This is not possible because the speed is independent of the field current. O b. decreased. O. increased. O d. None of the above. A single phase transformer is rated at 10KVA, 220/108. If a load resistance 1.5 ohm is connected across 108 V winding, calculate the transformer efficiency (in percent) if the total losses in the transformer is 2746W? Answer: Synchronous generator will produce sufficient electrical power output if it is given: Select one: O a. Ac current. O b. Mechanical power input and dc field current. O. Mechanical power input only. O d. Mechanical power input and Ac filed current.
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