Electrical Machines perguntas e respostas de entrevista
Pergunta 21. What is the role of the armature in an electric generator?
The armature in an electric generator is the rotating part that cuts across magnetic lines, inducing an electromotive force (EMF) in the coils and generating electrical power.
Pergunta 22. Explain the concept of torque-speed characteristics in DC motors.
Torque-speed characteristics depict the relationship between the torque developed by a DC motor and its speed. These curves are essential for motor selection and performance analysis.
Pergunta 23. What is the role of brushes in a DC motor?
Brushes in a DC motor maintain electrical contact between the rotating armature and the stationary part (stator), allowing current to flow into the armature windings.
Pergunta 24. Define the term 'horsepower' in the context of electrical machines.
Horsepower is a unit of power measurement, equivalent to 745.7 watts. It is commonly used to express the power output of motors and engines.
Pergunta 25. Explain the role of the main field winding in a synchronous generator.
The main field winding in a synchronous generator produces the magnetic field necessary for inducing voltage in the stator windings as the rotor rotates.
Mais uteis segundo os usuarios:
- What is the significance of the term 'slip' in induction motors?
- What is the purpose of laminations in the core of a transformer?
- What is the difference between a motor and a generator?
- What is the function of the stator in an electric motor?
- Define torque in the context of electrical machines.