1. If we decrease the input voltage of an asynchronous motor and the load is not changed, then its rotation speed will (). A. decrease B. stay unchanged C. increase
1. If we decrease the input voltage of an asynchronous motor and the load is not changed, then its rotation speed will (). A. decrease B. stay unchanged C. increase
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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![Multiple choicequestions
1. If we decrease the input voltage of an asynchronous motor and the load is not changed, then
its rotation speed will ().
A. decrease
B. stay unchanged
C. increase
2. If a single phase transformer (rated voltage:220V, rated frequency: 50Hz) is mistakenly
connected to a source (220V, 60Hz), then the main flux at the rated load in the transformer will ().
A. become larger
B. become smaller C. stay the same
3. The method to alter the rotation direction of a three-phase induction motor is ().
A. changing the frequency of the input voltage
B. changing the input voltage
C. changing the order of the phases in the field windings
D. changing the number of poles](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0484e7dc-463b-4f43-805a-5a3161a48807%2F63a339f7-9ed5-449a-bdbc-d3e4fe4e3a43%2Fr3js9cj_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Multiple choicequestions
1. If we decrease the input voltage of an asynchronous motor and the load is not changed, then
its rotation speed will ().
A. decrease
B. stay unchanged
C. increase
2. If a single phase transformer (rated voltage:220V, rated frequency: 50Hz) is mistakenly
connected to a source (220V, 60Hz), then the main flux at the rated load in the transformer will ().
A. become larger
B. become smaller C. stay the same
3. The method to alter the rotation direction of a three-phase induction motor is ().
A. changing the frequency of the input voltage
B. changing the input voltage
C. changing the order of the phases in the field windings
D. changing the number of poles
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