16Armature reaction is:AThe effect of armature flux on the main field fluxBVibration of the machineCHeating of the armatureDFriction in the armatureView AnswerDiscussWorkspaceReportSaveEasy
17DC series motors are used in:AGeneratorsBClocksCConstant-speed fansDTraction and cranesView AnswerDiscussWorkspaceReportSaveEasy
18A DC generator without residual magnetism will:AFail to build up voltageBRun as a motorCOverheatDProduce maximum voltageView AnswerDiscussWorkspaceReportSaveEasy