External characteristics for all separately DC generators (except series generator) can be summarized as ____________(a) Parabola opening in +x direction(b) Parabola opening in -x direction(c) Parabola opening in +y direction(d) Parabola opening in -y directionThe question was asked in unit test.My doubt stems from External and Armature Characteristics of DC Generator topic in portion DC Generator of DC Machines

External characteristics for all separately DC generators (except seri

1.	External characteristics for all separately DC generators (except series generator) can be summarized as ____________(a) Parabola opening in +x direction(b) Parabola opening in -x direction(c) Parabola opening in +y direction(d) Parabola opening in -y directionThe question was asked in unit test.My doubt stems from External and Armature Characteristics of DC Generator topic in portion DC Generator of DC Machines
Answer» The correct choice is (b) Parabola OPENING in -x direction The explanation: All parabolas for SEPARATELY EXCITED DC generator, shunt generator, compound generator are parabolas which are opening in -x directions, only centres of all parabolas lie at different places DEPENDING on the type of generator.

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