Direct Current Machine Or DC Machine Objective Questions and Answers

6.  Which of the following is not a part of Dc machine?

   A. Armature

   B. Commutator

   C. Field winding

   D. Damping winding

7.  The ventilating ducts in most of the DC machines are

   A. Radial

   B. Longitudinal

   C. Radial as well as longitudinal

   D. None of the above

8.  What are slot wedges in a DC machine made of?

   A. Mild steel

   B. Silicon steel

   C. Fibre

   D. Cast iron

9.  In a DC machine, the brushes are physically placed in the

   A. Polar axis and electrically connected to the coils lying in the Interpolar axis

   B. Polar axis electrically connected to the coils lying in the polar axis

   C. Interpolar axis and electrically connected to the coils lying in the polar axis

   D. Interpolar axis and electrically connected to the coils lying in the interpolar axis

10.  In lap winding the number of brushes is always........... the number of polls

   A. Double

   B. Same as

   C. Half

   D. None of the above

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