DC Motors
D.C. generators are normally designed for maximum efficiency around

All of these
Rated voltage
Rated r.p.m.
Full load

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DC Motors
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens

Motor will come to stop
Nothing will happen to motor
This will make armature to take heavy current, possibly burning it
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

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