By what means is the frequency of an AC...

Question 1 / 270705eccefa4bacbc34ba4d48159

Question 1 of 270705eccefa4bacbc34ba4d48159

By what means is the frequency of an AC generator adjusted?

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Question 1 of 27070

Q

By what means is the frequency of an AC generator adjusted?

🔍 Key Concepts

• Relationship between AC generator frequency and rotational speed • What a governor controls on a prime mover (engine or turbine) • Difference between controlling voltage (field rheostat) and controlling frequency

💭 Think About

• Ask yourself: Is AC frequency mainly determined by how strong the magnetic field is, or by how fast the generator is turning? • Which device in the options directly affects shaft speed of the generator set? • Which devices in the options are normally used to control voltage rather than frequency?

✅ Before You Answer

• Confirm the formula for AC frequency: f = (P × N) / 120 where P = poles, N = rpm • Identify which choice directly changes rpm under load • Eliminate any options that are primarily used for voltage regulation rather than speed control

Question 1 of 27070

Q

By what means is the frequency of an AC generator adjusted?

A

main alternator field rheostat

B

exciter field rheostat

C

prime mover governor control

D

equalizing reactor

Question 1 / 270705eccefa4bacbc34ba4d48159

Question 1 of 270705eccefa4bacbc34ba4d48159

By what means is the frequency of an AC generator adjusted?

Back

Question 1 of 27070

Q

By what means is the frequency of an AC generator adjusted?

🔍 Key Concepts

• Relationship between AC generator frequency and rotational speed • What a governor controls on a prime mover (engine or turbine) • Difference between controlling voltage (field rheostat) and controlling frequency

💭 Think About

• Ask yourself: Is AC frequency mainly determined by how strong the magnetic field is, or by how fast the generator is turning? • Which device in the options directly affects shaft speed of the generator set? • Which devices in the options are normally used to control voltage rather than frequency?

✅ Before You Answer

• Confirm the formula for AC frequency: f = (P × N) / 120 where P = poles, N = rpm • Identify which choice directly changes rpm under load • Eliminate any options that are primarily used for voltage regulation rather than speed control