A Best Way To Crack Gorenment Job Exams

Electrical Engineering Objective Questions { DC Motors }

43.  Polarity of reversed nY a de generator can
A. increasing field current
B. reversing field current
C. reversing the direction of rotation
D. reversing field current and also the direction of rotation
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44.  The yoke of a dc machine is
A. always made ofmagnetic material
B. sometimes made ofmagnetic material
C. is always made o f nonmagnetic material
D. made ofmagnetic mate rial only for high rpm machines
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45.  The emf induced. n the armature of a de machine is proportional to
A.(c) 0/(0 N)
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46.  The or pitch of lap
C. +1 or ?1 Ni
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47.  A de generator of commutate winding is has 6 poles. A physical shift brush shift of 6?means an eke trical brush
A. 6?
B. 18?
D. none of these
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48.  For wave 2?
A. mu winding, the average pitch
B. must be even
C. may be odd or even
D. must be fractional
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49. The number of armature parallel paths in a triplex pole de generator provided with lap winding win be
A. 10 PN
B. 30 PN
C. 120 PN
D. 180 PN
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