Direct Current Machine Or DC Machine Objective Questions and Answers

11.  In DC machines the air gap flux distribution in space at no-load is

   A. Sinusoidal

   B. Triangular

   C. Flat topped

   D. Pulsating

12.  In a DC machine the actual flux distribution depends upon

   A. Size of air gap

   B. Shape of pole shoes

   C. Clearance between tips of the adjacent pole shoes

   D. All of the above

13.  In a DC machine the armature mmf is

   A. Stationary with respect to the field pole but rotating with respect to the armature

   B. Rotating with respect to field poles as well as armature

   C. Rotating with respect to field poles

   D. Stationary with respect to armature

14.  In a DC machine the space waveform of the air gap flux distribution affects

   A. Torque only

   B. Voltage only

   C. Both torque and voltage

   D. Neither the torque not the voltage

15.  In a DC machine the number of mechanical and electrical degrees will be same when the number of poles on the machine is

   A. 4

   B. 2

   C. 6

   D. 8

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