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)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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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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