Electrical Machines 面试题与答案
问题 26. What is the purpose of a governor in a hydroelectric generator?
A governor in a hydroelectric generator controls the flow of water to the turbine, regulating the generator's speed and ensuring stable power output.
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问题 27. Define the term 'crawling' in induction motors.
Crawling is a phenomenon in induction motors where the motor runs at speeds slightly less than the synchronous speed, causing vibrations and noise. It can be mitigated by using skewed rotor slots.
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问题 28. Explain the principle of operation of a universal motor.
A universal motor can operate on both AC and DC power. It has a series-wound armature and is commonly used in applications requiring variable speed.
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问题 29. What is the function of a choke in a fluorescent lamp ballast?
A choke (inductor) in a fluorescent lamp ballast limits the current flowing through the lamp, ensuring proper operation and preventing excessive current.
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