Under normal conditions, how is the speed of...

Question 1 / 270705eccefa4bacbc34ba4d481f9

Question 1 of 270705eccefa4bacbc34ba4d481f9

Under normal conditions, how is the speed of a two-speed squirrel cage induction motor changed?

Question 1 of 27070

Under normal conditions, how is the speed of a two-speed squirrel cage induction motor changed?

🔍 Key Concepts

• Characteristics of a squirrel cage induction motor • How changing the number of poles affects synchronous speed • Which controls are practical for a built-in two-speed design vs. external speed variation

💭 Think About

• For a motor specifically designed as a two-speed unit, which part of its construction can be switched to give two distinct synchronous speeds? • Which of these options would normally require a different power supply rather than an internal motor change? • Does varying voltage or rotor resistance in a squirrel cage design usually create two definite speeds or just change torque/slip slightly?

✅ Before You Answer

• Identify which option directly determines synchronous speed in an induction motor • Recall that a squirrel cage rotor does not normally allow external resistance changes • Distinguish between effects on speed versus effects on torque/current when changing voltage

Question 1 of 27070

Under normal conditions, how is the speed of a two-speed squirrel cage induction motor changed?

frequency of the applied voltage

resistance in the rotor circuit

number of field poles

amplitude of the applied voltage