When two D.C. series motors are connected in parallel, the resultant speed is

Answer: Option A

When two DC series motor are connected in parallel then the resultant speed is more than the normal speed. If the voltage across each motor is V and current through each motor in parallel connection is $$\frac{I}{2}.$$ So
$$\text{speed}\propto \frac{\text{voltage}}{\text{current}}\propto \left(\frac{\text{V}}{\frac{I_{\text{a}}}{2}}\right)\Rightarrow 2\left(\frac{\text{V}}{I_{{}_{\text{a}}}}\right)$$

Hence the resultant speed is more than normal speed.