WIREMAN TRADE THEORY – III SEMESTER

WIREMAN

TRADE THEORY – III SEMESTER

           Questions 1-15 carry 2 marks (15×2)

1.      A generator which convert …………….. into…………………

2.      ………………is used to convert AC into DC

3.      Coil, shaft & slip ring together called as……………

4.      Collection of split ring is called as…………..

5.      Working principle of DC generator is…………..

6.      The emf induced in DC generator is……………. type

7.      Induced emf in DC generator ……………..

8.      ……………….allows the magnetic circuit to complete through it.

9.      ……………..spread out flux uniformly in the air gap.

10.  ………………..made of copper wire.

11.  ………………..which permit axial flow of air in armature core.

12.  Armature conductors are placed in ……………….

13.  Commutator  segments are connected to the armature by means of ……………..

14.  The brush placed in…………………

15.  The brush position to the axis can be set by changing the position of the ……………

Questions 16-19each carry 5 marks(5×4=20)

16.  Write about types of armature winding.

17.  Draw magnetizing characteristics of dc machine.

18.  Derive emf equation of dc generator.

19.  What is residual magnetism ,residual voltage and critical resistance with graph.