DC Motors Excessive sparking at brushes may be caused due to Dirt on the commutator Worn bearings Misaligment of machine Loose coupling Dirt on the commutator Worn bearings Misaligment of machine Loose coupling ANSWER DOWNLOAD EXAMIANS APP
DC Motors Ward-Leonard control is basically a Field control method Field divertor method Voltage control method Armature resistance control method Field control method Field divertor method Voltage control method Armature resistance control method ANSWER DOWNLOAD EXAMIANS APP
DC Motors The iron loss in dc motor depends on Both flux and speed Speed only Flux only None of the listed here Both flux and speed Speed only Flux only None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors The back emf in a dc motor ______ Opposes the applied voltage Aids the applied voltage Aids the armature current None of the listed here Opposes the applied voltage Aids the applied voltage Aids the armature current None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors For starting a dc motor a starter is required because None of the listed here It limits the speed of the motor It limits the starting current to a safe value It starts the motor None of the listed here It limits the speed of the motor It limits the starting current to a safe value It starts the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens 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 Nothing will happen to motor Motor will come to stop 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 Nothing will happen to motor Motor will come to stop ANSWER DOWNLOAD EXAMIANS APP
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