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SSC JE Electrical Engineering 2015 Paper

Question : 179 of 199

Marks: +1, -0

The Ta Vs Ia graph of a dc series motor is a

Solution:

Torque in DC series motor

(T) \propto \phi I_a

field is series with armature winding then

I_a \propto \phi

So Torque ∝

I_a^2

, if field saturate and flux become constant

T \propto I_a

So, Torque

V_a I_a

graph in DC series motor is pardoloa up to full load and straight line after saturation.

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