Welcome to the World Of 

      "Rotating Machines"    

         

  

(1)        Rotating Machine Principle
(2)        Definition  Of Different Motor
(3)        Comparison of the characteristic of AC and DC Motors
(4)        Compression of the Synchronous and Induction Motor
(5)        Induction Motor
(6)        DC Motor
(7)        Synchronous Machine

 

 

               Objective question answer 

               Ref: on  Electrical Machinery Fundamentals, by Stephen J. Chapman.

 

 

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

 

0 degree

45 degree

90 degree

120 degree

 

 

 

 

2.   Which motor can run only at synchronous speed ?

 

DC shunt motor.

DC series motor.

Induction Motor.

Synchronous Motor.

 

 

 

3.   Which motor is highly unstable ?

 

3 phase Induction motor.

1 phase Induction motor

Synchronous motor.

DC motor.

 

 

 

4.   Which motor is most simple and reliable ?

 

Induction motor

Synchronous induction motor.

DC motor

Synchronous motor.

 

 

 

5.   No load speed of DC series motor is ?

 

depend on applied voltage.

less then synchronous speed

synchronous speed

Infinite.

 

 

 

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