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How many parts does the flux produced by stator mmf passes through?
Answer: c Explanation: The flux produced by stator mmf passes through 5 parts. They are air gap, rotor teeth, rotor core, stator teeth, stator core.
Answer: c
See lessExplanation: The flux produced by stator mmf passes through 5 parts. They are air gap, rotor teeth, rotor core, stator teeth, stator core.
How is the Magnetizing component with respect to the voltage?
Answer: d Explanation: The magnetizing current component is 90° out of phase with the voltage. The loss component is in phase with the voltage.
Answer: d
See lessExplanation: The magnetizing current component is 90° out of phase with the voltage.
The loss component is in phase with the voltage.
How many components does the no load current characteristics comprise of?
Answer: a Explanation: There are 2 main components under the no load current. They are Magnetizing current and Loss component of current.
Answer: a
See lessExplanation: There are 2 main components under the no load current. They are
Magnetizing current and Loss component of current.
How many methods are present to obtain all the machine performance characteristics?
Answer: b Explanation: There are 2 methods in obtaining all the open circuit characteristics. They are no load characteristics and short circuit characteristics.
Answer: b
See lessExplanation: There are 2 methods in obtaining all the open circuit characteristics. They are no load characteristics and short circuit characteristics.
How is the size of insulation determined?
Answer: d Explanation: Maximum voltage stress and mechanical stress is necessary to determine the size of insulation. In case if two machines operate at the same voltage, large-sized conductors will need thicker insulation
Answer: d
See lessExplanation: Maximum voltage stress and mechanical stress is necessary to determine the size of insulation. In case if two machines operate at the same voltage, large-sized conductors will need thicker insulation
What part of electric machines will the temperature rise mainly affect?
Answer: b Explanation: Temperature rise will affect the life of the insulation. If insulation is affected the life of the machine also decreases. Proper cooling and ventilation must be ensured according to electric machine design to keep the temperature rise within limits.
Answer: b
See lessExplanation: Temperature rise will affect the life of the insulation. If insulation is affected the life of the machine also decreases. Proper cooling and ventilation must be ensured according to electric machine design to keep the temperature rise within limits.
How is the saturation level of ferromagnetic materials determined in electrical machines?
Answer: a Explanation: The maximum allowable flux density helps in determining the saturation level of ferromagnetic materials. More the flux density more will be the excitation.
Answer: a
See lessExplanation: The maximum allowable flux density helps in determining the saturation level of ferromagnetic materials. More the flux density more will be the excitation.
Which of the following circuit is made to insulate one conductor from another?
Answer: c Explanation: A dielectric circuit in electrical machine design has insulation that is used to insulate one conductor from another. They are also used to insulate the windings and the core.
Answer: c
See lessExplanation: A dielectric circuit in electrical machine design has insulation that is used to insulate one conductor from another. They are also used to insulate the windings and the core.
How should be the number of slots in a DC electric machine for better cooling of armature conductors?
Answer: a Explanation: A large number of slots will require fewer conductors per slot and only fewer conductors are bunched together. For better cooling of armature conductors, a large number of slots are needed.
Answer: a
Explanation: A large number of slots will require fewer conductors per slot and only fewer conductors are bunched together. For better cooling of armature conductors, a large number of slots are needed.
See lessWhich of these options are correct for a DC electric machine with a large air gap?
Answer: b Explanation: A DC electric machine with a large air gap has less pulsational loss in pole face, quieter operation of the machine, less distorting effect of armature reaction, and improved ventilation.
Answer: b
See lessExplanation: A DC electric machine with a large air gap has less pulsational loss in pole face, quieter operation of the machine, less distorting effect of armature reaction, and improved ventilation.