In a 6 pole dc machine,90 mechanical degrees corresponds to ......... electrical degrees.

In a 6 pole dc machine,90 mechanical degrees corresponds to ......... electrical degrees.

A. 30
B. 180
C. 45
D. 270


Explanatory answer:

The relationship between mechanical and electrical degrees is

1 degree mechanical = (P/2) electrical degrees

i.e. for 1 deg of mechanical revolution of conductor inside a magnetic field produces (P/2) degree electrical output.

Given, P=6

90 deg mechanical = 90 (P/2) electrical

                             = 90*(6/2)
                             = 270 degree electrical

i.e. for 90 deg mechanical revolution ,it produces 270 deg electrical output.