DC Motors The back emf in a dc motor ______ None of the listed here 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 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 resistance is connected in series with armature Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected parallel to the armature A resistance is connected in series with armature Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected parallel to the armature ANSWER DOWNLOAD EXAMIANS APP
DC Motors Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be Differentially compounded Cumulatively compounded Level compounded Under compounded Differentially compounded Cumulatively compounded Level compounded Under compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors The starting resistance of a DC motor is generally Low Infinitely large Around 500 Ω 1000 Ω Low Infinitely large Around 500 Ω 1000 Ω ANSWER DOWNLOAD EXAMIANS APP
DC Motors When two dc series motor are commected in parallel, the resultant speed is Normal speed Loss than the normal speed More than the normal speed Zero Normal speed Loss than the normal speed More than the normal speed Zero ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking Regenerative Plugging Dynamic braking None of these Regenerative Plugging Dynamic braking None of these ANSWER DOWNLOAD EXAMIANS APP
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