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Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications Comments
- Question
Power is measured in a three-phase load by using an ammeter.
Options- A. True
- B. False
- Correct Answer
- False
- 1. The stator is the rotating assembly in a generator or motor.
Options- A. True
- B. False Discuss
- 2. In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.
Options- A. True
- B. False Discuss
- 3. Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.
Options- A. True
- B. False Discuss
- 4. Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
Options- A. True
- B. False Discuss
- 5. The superposition theorem is useful for circuit analysis only in ac circuits.
Options- A. True
- B. False Discuss
- 6. A simple three-phase generator consists of three conductive loops separated by 120°.
Options- A. True
- B. False Discuss
- 7. A simple two-phase generator consists of two conductive loops separated by 90°, rotating in a magnetic field.
Options- A. True
- B. False Discuss
- 8. Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.
Options- A. True
- B. False Discuss
- 9. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage.
Options- A. True
- B. False Discuss
- 10. The term squirrel-cage applies to a type of three-phase ac generator.
Options- A. True
- B. False Discuss
Three-Phase Systems in Power Applications problems
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Correct Answer: False
Explanation:
The two main parts of a generator or motor can be described in either mechanical or electrical terms:
Mechanical:
Rotor: The rotating part of an electrical machine
Stator: The stationary part of an electrical machine
Electrical:
Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.
Mechanical:
Rotor: The rotating part of an electrical machine
Stator: The stationary part of an electrical machine
Electrical:
Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.
Correct Answer: True
Correct Answer: False
Correct Answer: True
Correct Answer: False
Correct Answer: True
Correct Answer: True
Correct Answer: True
Correct Answer: False
Correct Answer: True
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