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AE & JE EE Quiz: Electrical Machine Booster Quiz-2

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Question 1

In a DC compound motor operating at rated voltage & rated torque. If the series winding is shorted, then what will be effect on speed of motor?

Question 2

Which one of the following statements is not correct regarding lap and wave winding ?

Question 3

Which of the following is incorrectly method?

Question 4

Consider the following factors for a dc machine:
1) Interpole
2) Armature resistance
3) Reduction in field current
Which of the above factors are responsible for decrease in terminal voltage of a shunt generator?

Question 5

A self-excited d.c. shunt generator, driven by its prime-mover at the rated speed fails to build up voltage across its terminals at no-load. What reason can be assigned for this?

Question 6

In a dc machine running with a heavy load, and with the brushes located on the geometrical neutral axis sparking occurs
at the brushes during commutation, because of

Question 7

What is the condition of retrogressive winding in dc machines?

Question 8

Match List-I (DC motor) with List-II (Characteristic) and select the correct answer using the code given below the lists :
List-I
A) Cumulatively compound motor
B) Differentially compound motor
C) Series motor
D) Shunt motor
List-II
1) Fairly constant speed irrespective of the load
2) It may start in reverse direction
3) Define no-load speed
4) Is never started without load

Question 9

The wave form of the armature m.m.f. in DC machine is _____.

Question 10

In a DC machine, the current in the armature winding is:

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AE & JE Exams

Nov 28AE & JE Exams