DC motor converts

• Electrical Energy into chemical energy

• Electrical energy to Mechanical Energy

• Mechanical Energy to Electrical Energy

• None of the above

How do u relate the DC motor speed?

• DC motor speed is directly proportional to armature voltage and inversely proportional to flux in field winding.

• DC motor speed is directly inversely proportional to armature voltage and inversely proportional to flux in field winding.

• DC motor speed is directly proportional to armature voltage and flux in field winding.

• DC motor speed is directly proportional to armature voltage and proportional to flux in field winding.

How do u obtain desired speed of an armature controlled DC motor ?

• by varying armature current

• by varying the armature voltage

• by varying emf

• by varying transformer voltage

In DC motor, back

emf is directly proportional to speed ( say true/false )

• TRUE

• FALSE

Which factors not

affecting the speed of dc motors?

• Flux

• Current

• Applied voltage.

• Voltage across the armature

In which method ,

speed control will be done by changing the resistance?

• Flux control method

• Armature control method

• Armature Voltage control method

In flux control

method, variable resistance is connected series with ____ winding

• Shunt filed winding

• Armature winding

• Both armature and field winding

What does the Thumb indicates?

• current direction

• motion of conductor

• direction of Field flux

The DC motor Works on the principle of

• Mutual Induction

• Electro magnetic Induction

• Self Induction

• all of the above

The Direction of force in DC motor is identified by

• Fleming's Left hand Rule

• Fleming's Right hand Rule

• Lenz's Law

• Faraday's law