1.   A three phase set of current are differing in phase by :

 

perpendicular to the direction of the current and to the magnetic field.

parallel to the direction of the current and to the magnetic field.

orthogonal to the direction of current but not to the magnetic field.

orthogonal to the direction of current and to the magnetic field.

 

 

 

2.   Which one is true for DC Motor:

 

DC Motor has only one winding.

Armature winding is located on the stator.

Armature winding is located on the rotor.

Field winding is located on the rotor.

 

 

 

3.   It is possible to reverse the direction of rotation of an DC motor by :

 

changing input frequency

changing  the input voltage

changing the number of pole

Reversing the input connection

 

 

 

4.   Which type of DC Motor is called universal motor

 

  Compound Motor

  Shunt Motor

  Series Motor

  None 

 

 

 

5.   The torque in the DC motor is 

Inversely proportional to the speed

Directly proportional to the speed

Twice of the speed

No such relation exist.