400-V dc shunt motor takes a current of 5.6 A on no-load and 68.3 A o – McqOptions

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1.	400-V dc shunt motor takes a current of 5.6 A on no-load and 68.3 A on full-load. Armature reaction weakens the field by 3%. What is the ratio of full-load speed to no-load speed? Given: Ra = 0.18 Ω, brush voltage drop= 2 V, Rf = 200 Ω.
A.	1.2
B.	0.8
C.	1.4
D.	1
Answer» E.

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