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Questions and Answers
What is the synchronous speed of a 220-V, 8-pole, 50 Hz induction motor?
What is the synchronous speed of a 220-V, 8-pole, 50 Hz induction motor?
- 1500 rpm
- 1800 rpm
- 1200 rpm (correct)
- 3000 rpm
What is the rotor frequency of a 400-V, 50 Hz, three-phase induction motor at rated load?
What is the rotor frequency of a 400-V, 50 Hz, three-phase induction motor at rated load?
- 0 Hz
- 2 Hz (correct)
- 50 Hz
- 20 Hz
In a four-pole, 50 Hz induction motor supplying 12 kW to a load at 1450 rpm, what is the slip?
In a four-pole, 50 Hz induction motor supplying 12 kW to a load at 1450 rpm, what is the slip?
- 2.5%
- 8%
- 12%
- 5% (correct)
What happens to the maximum torque of a motor if the rotor resistance is doubled?
What happens to the maximum torque of a motor if the rotor resistance is doubled?
What is the output power of a 400-V, 50 Hz, 40-hp induction motor if its input power includes 1.8 kW of copper losses?
What is the output power of a 400-V, 50 Hz, 40-hp induction motor if its input power includes 1.8 kW of copper losses?
Flashcards
Synchronous Speed
Synchronous Speed
The speed at which the magnetic field rotates in an induction motor, calculated using the frequency and number of poles.
Slip
Slip
The difference between the synchronous speed and the rotor speed, expressed as a percentage of the synchronous speed. It indicates how much the rotor is lagging behind the rotating magnetic field.
Air-Gap Power (Pag)
Air-Gap Power (Pag)
The power transferred from the stator to the rotor through the air gap. It represents the energy that makes the rotor spin.
Power Converted (Pconv)
Power Converted (Pconv)
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Output Power (Pout)
Output Power (Pout)
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