A 200-V Dc generator supplies 4 kW at a terminal voltage of 200 V, the – McqOptions

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1.	A 200-V Dc generator supplies 4 kW at a terminal voltage of 200 V, the armature resistance being 0.5 Ω. If the machine is operated as a motor at the same terminal voltage with the same armature current, find the ratio of the generator speed Ng, to the motor speed Nm .
A.	\(\dfrac{N_g}{N_m}=1.25\)
B.	\(\dfrac{N_g}{N_m}=1.105\)
C.	\(\dfrac{N_g}{N_m}=0.905\)
D.	\(\dfrac{N_g}{N_m}=0.833\)
Answer» C. \(\dfrac{N_g}{N_m}=0.905\)

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