11Maximum efficiency of a transformer occurs when:ACopper loss is zeroBCopper loss equals iron lossCLoad is zeroDIron loss is maximumView AnswerDiscussWorkspaceReportSaveEasy
12An ideal transformer has:ANo losses and 100% efficiencyB50% efficiencyCCopper losses onlyDIron losses onlyView AnswerDiscussWorkspaceReportSaveEasy
13A transformer works on the principle of:AThermionic emissionBElectrostaticsCMutual inductionDSelf induction onlyView AnswerDiscussWorkspaceReportSaveEasy
14Copper losses in a transformer vary with:AThe square of the load currentBFrequency onlyCVoltage onlyDNothingView AnswerDiscussWorkspaceReportSaveEasy
15A step-up transformer has:AFewer secondary turnsBNo secondaryCMore turns on the secondary than the primaryDEqual turnsView AnswerDiscussWorkspaceReportSaveEasy