Introduction to DC Motor

what is the function of using bearing in DC Motor

• connect the supply          

   

• produce magnetic flux

•   cover the motors parts       

•   reduce friction

   

Which one of the following is an application of DC motor?

• Transformer                                 

•                           ceiling fan

• cordless drill                              

   

•                                Water pump

   

what is name of device  in the figure shown below

• Transformer                                    

•                              DC motor

   

• drill                                             

• electromagnet

   

In DC motor the resistances value of the Shunt and series windings are

• Same

• Shunt winding > series winding

• Shunt winding < series winding

• Shunt winding + series winding = 1

) In the figure shown, part number (1) is

• frame

   

• Stator (field coil)

   

• Shaft

   

• Armature

   

In the figure shown, part number (1) is

• frame

• coil

• Shaft

• Armature

In the figure shown, part number (1) is

• frame

• coil

   

• Shaft

   

• Armature

   

In the figure shown, part number (1) is:

• frame

• coil

• Shaft

• Armuture  

R.P.M stands for

• Rotation Per Meter

   

• Revolutions Per Meter

• Rotation Per Mile

• Revolutions Per Minute

   

In a continuity test for a motor, if the reading of ohmmeter is infinity(∞), then winding is:

• Open-circuited

• Short-circuited

• Grounded

• Not insulated