DC Motors
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

Brake test
Field test
Swinburne's test
Hopkinson's test

ANSWER DOWNLOAD EXAMIANS APP

DC Motors
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit

A high value resistor is connected across the field winding
Armature is temporarily open circuited
A resistance is connected parallel to the armature
A resistance is connected in series with armature

ANSWER DOWNLOAD EXAMIANS APP