DC Motors
Which D.C. motor is generally preferred for cranes and hoists?

Cumulatively compounded motor
Differentially compounded motor
Series motor
Shunt motor

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

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

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