Unit-9 Maintaining Motors and Generators

Affect the casing and electrical connections of a DC Motor, which of these is true.

•   The exposure to explosive, abrasive or conducting dust.

• The supply current to the motor

• The level of operating hours only

• When the servicing maybe required

Which device takes an electrical input and produces a mechanical output.    

• Transformer

• Rotary Synchronous Actuator

• AC Generator

• Motor

Which one is a valid weekly inspection that would be recommended for maintenance on generators.    

• General Inspection of Electrical Connections

• Drain and top up any Coolant.

• Lubrication of the stator windings

• Changing any fuel filters

Which of these is a genuine type of rotor construction used in AC motors.

 

• Permanent magnetic motor

• Shunted wound rotor.

• An Insulated Stator

• Squirrel Cage Rotor

What generator develops its charge generated from the tribo electric effect as an option.

• Brushless Generator

• Stepper motor

• PMDC Generator

• Electrostatic Generator

The motor converts ____energy to_______ energy.  

• Electrical Energy to Mechanical Energy

• Mechanical to Electrical

•    Light to mechanical

•    Mechanical to sound

The generator converts ____energy to_______ energy.    

• Electrical to Mechanical

• Mechanical to electrical

• Mechanical sound

• Electrical to light

What type of device used in an electrical fan 

• Generator

• Motor

• Alternator

• Carburetor

In consideration of Torque and power of DC motors, ARMATURE torque is proportional to    

• Distance of each conductor from the center of the axis

• Iron losses and supply voltage

• The friction loss of the bearings and the commutator

• The material of the pole pieces

When comparing three phase induction motors to single phase motors, which statement is true.  

• The efficiency of a single-phase motor is greater.

• A powerful motor, a smaller frame than a single-phase motor

• 3-Phase motors have lower torque

• A brushed motor requires less maintenance.