DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Can be used for 50°C ambient temperature also Of lower H.P. should be selected Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Can be used for 50°C ambient temperature also Of lower H.P. should be selected ANSWER DOWNLOAD EXAMIANS APP
DC Motors In dc machines fractional pitch winding is used To increase the generated emf To reduce the generated emf To improve cooling To reduce the sparking To increase the generated emf To reduce the generated emf To improve cooling To reduce the sparking ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc motor if the back emf is absent Motor will burn Motor will run at very high speed Motor will run at very slow speed Motor will not run at all Motor will burn Motor will run at very high speed Motor will run at very slow speed Motor will not run at all ANSWER DOWNLOAD EXAMIANS APP
DC Motors By putting controller resistance in series with the armature of a dc motor, we can obtain speeds Above as well as below the normal speed Below the normal speed only Above the normal speed only None of the listed here Above as well as below the normal speed Below the normal speed only Above the normal speed only None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc motor is still used in industrial applications because it Provides fine speed control None of the listed here Is simple in construction Is cheap Provides fine speed control None of the listed here Is simple in construction Is cheap 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 A resistance is connected in series with armature Armature is temporarily open circuited A resistance is connected parallel to the armature A high value resistor is connected across the field winding A resistance is connected in series with armature Armature is temporarily open circuited A resistance is connected parallel to the armature ANSWER DOWNLOAD EXAMIANS APP
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