SSC JE Electrical Engineering 2017 Set 4 Paper

Cumulative compound motor is used for intermittent motor, the field is collectively generated by both the series and shunt field winding. Speed control on such motor is a little tough as it may require the varying of supply across the armature and high torque load.
$\left[\mathit{T}\propto \left({\mathit{\varphi }}_{\mathrm{series}}+{\mathit{\varphi }}_{\mathrm{shunt}}\right){\mathit{I}}_{\mathit{a}}\right]$