DC Motors In a dc motor if the back emf is absent Motor will run at very high speed Motor will burn Motor will not run at all Motor will run at very slow speed Motor will run at very high speed Motor will burn Motor will not run at all Motor will run at very slow speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors A compensating winding is an auxiliary winding embedded in slots in The armature Partly in pole faces, partly in armature The pole faces of main poles None of the listed here The armature Partly in pole faces, partly in armature The pole faces of main poles None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors The main disadvantage of the Ward-Leonard control method is High maintenance cost High initial cost Low efficiency at high loads All of these High maintenance cost High initial cost Low efficiency at high loads All of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors By putting controller resistance in series with the armature of a dc motor, we can obtain speeds None of the listed here Above the normal speed only Below the normal speed only Above as well as below the normal speed None of the listed here Above the normal speed only Below the normal speed only Above as well as below the normal speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors The dirction of rotation of a dc series motor can be changed by None of the listed here Either of Interchanging field or Interchanging supply Interchanging supply terminals Interchanging field terminals None of the listed here Either of Interchanging field or Interchanging supply Interchanging supply terminals Interchanging field terminals ANSWER DOWNLOAD EXAMIANS APP
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 Can be used for 50°C ambient temperature also 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 Of lower H.P. should be selected Can be used for 50°C ambient temperature also 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 Of lower H.P. should be selected ANSWER DOWNLOAD EXAMIANS APP
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