How is the speed of a squirrel-cage,...

Question 1 / 205eccefa4bacbc34ba4d481fc

Question 1 of 205eccefa4bacbc34ba4d481fc

How is the speed of a squirrel-cage, multi-speed, induction motor, as used aboard ship, typically changed?

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Question 1 of 20

5eccefa4bacbc34ba4d481fc

How is the speed of a squirrel-cage, multi-speed, induction motor, as used aboard ship, typically changed?

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🔍 Key Concepts

• Synchronous speed of an AC induction motor depends on frequency and number of poles ((N_s = 120 f / P)). • A squirrel‑cage rotor has fixed bars and is not designed for adding external resistance. • A multi‑speed motor is usually built to change speed in steps (two‑speed, four‑speed, etc.), not by smoothly varying supply conditions.

💭 Think About

• Which of the listed methods matches how a ship’s power system normally operates (constant frequency or variable frequency)? • For a squirrel‑cage motor, which part of the motor is practical to reconfigure from outside: the rotor circuit or the stator windings? • Which option explains how you can get distinct speed ‘steps’ (low, medium, high) within the same motor frame?

✅ Before You Answer

• Check which option uses the basic synchronous speed formula: (N_s = 120 f / P). • Verify which choice would not apply to a squirrel‑cage rotor because you cannot conveniently add or change rotor resistance. • Confirm which method is commonly used in multi‑speed shipboard motors without changing the ship’s main power frequency.

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Question 1 of 20

How is the speed of a squirrel-cage, multi-speed, induction motor, as used aboard ship, typically changed?

changing the number of connected poles in the stator

changing the frequency to the motor

changing the excitation voltage

changing the resistance of the rotor circuit

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Question 1 / 205eccefa4bacbc34ba4d481fc

Question 1 of 205eccefa4bacbc34ba4d481fc

How is the speed of a squirrel-cage, multi-speed, induction motor, as used aboard ship, typically changed?

Back

Question 1 of 20

5eccefa4bacbc34ba4d481fc

How is the speed of a squirrel-cage, multi-speed, induction motor, as used aboard ship, typically changed?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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