1An ideal transformer has:ACopper losses onlyBIron losses onlyC50% efficiencyDNo losses and 100% efficiencyView AnswerDiscussWorkspaceReportSaveEasy
2Transformer rating is given in kVA rather than kW because:AkW is not a unitBIt is tradition onlyCTransformers produce powerDLosses depend on voltage and current, not on the load's power factorView AnswerDiscussWorkspaceReportSaveEasy
3The open-circuit test on a transformer measures:ACopper lossesBCore (iron) lossesCInsulationDEfficiency directlyView AnswerDiscussWorkspaceReportSaveEasy
4A transformer works on the principle of:AElectrostaticsBMutual inductionCThermionic emissionDSelf induction onlyView AnswerDiscussWorkspaceReportSaveEasy
5Copper losses in a transformer vary with:AVoltage onlyBNothingCFrequency onlyDThe square of the load currentView AnswerDiscussWorkspaceReportSaveEasy