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Questions and Answers
What is the ratio of increase in phase voltage when connected to a delta configuration?
What is the ratio of increase in phase voltage when connected to a delta configuration?
- √3 (correct)
- 2
- 1/√3
- √2
What is the main difference between single-phase and polyphase induction motors?
What is the main difference between single-phase and polyphase induction motors?
- The size of the motor
- The rotation of the stator field (correct)
- The type of voltage used
- The number of windings in the stator
What is the principle behind the rotation of the rotor in a single-phase induction motor?
What is the principle behind the rotation of the rotor in a single-phase induction motor?
- Lenz's law
- Fleming's right-hand rule
- Electromagnetic induction (correct)
- Faraday's law of induction
What would happen to the magnetic field if the rotor is rotated by an outside force?
What would happen to the magnetic field if the rotor is rotated by an outside force?
What is the relationship between the rotor field and the stator field in a single-phase induction motor?
What is the relationship between the rotor field and the stator field in a single-phase induction motor?
What is the main advantage of single-phase induction motors?
What is the main advantage of single-phase induction motors?
What is the angular spacing between individual phase windings around the stator?
What is the angular spacing between individual phase windings around the stator?
What is the direction of the resultant magnetic field rotation during a three-phase cycle?
What is the direction of the resultant magnetic field rotation during a three-phase cycle?
At point 1, what is the characteristic of the magnetic fields in coils 2-2A and 3-3A?
At point 1, what is the characteristic of the magnetic fields in coils 2-2A and 3-3A?
What is the purpose of the left-hand rule in determining the electromagnetic polarity of the poles?
What is the purpose of the left-hand rule in determining the electromagnetic polarity of the poles?
What is the assumption made in explaining rotor movement using the diagram?
What is the assumption made in explaining rotor movement using the diagram?
What is the total angular displacement of the magnetic field after completing one full three-phase cycle?
What is the total angular displacement of the magnetic field after completing one full three-phase cycle?
What is the purpose of the capacitor in the starting circuit of a capacitor start split-phase motor?
What is the purpose of the capacitor in the starting circuit of a capacitor start split-phase motor?
What is the effect of the currents in the main and auxiliary windings being 90° out of phase?
What is the effect of the currents in the main and auxiliary windings being 90° out of phase?
What happens to the starting winding when the motor reaches nearly full speed?
What happens to the starting winding when the motor reaches nearly full speed?
What is the purpose of the centrifugal device in the capacitor start split-phase motor?
What is the purpose of the centrifugal device in the capacitor start split-phase motor?
What is the effect of the inductive reactance (XL) of the main winding?
What is the effect of the inductive reactance (XL) of the main winding?
What is the phase shift between the currents in the main and auxiliary windings?
What is the phase shift between the currents in the main and auxiliary windings?
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