Quiz — corrigé_Oscillations électriques forcées_Série_4.pdf

Question 1 sur 10 20:00

[{"id":15529,"question":"Dans un circuit RLC série en régime forcé, quel dipôle impose la phase du courant ?","option_a":"La résistance R","option_b":"Le condensateur C","option_c":"La bobine L","option_d":"Aucun dipôle","option_e":"","option_f":"","bonne_reponse":"a","explication":"La résistance R est le seul dipôle dont la tension est en phase avec le courant. Le condensateur et la bobine introduisent un déphasage.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"La résistance R\", \"b\": \"Le condensateur C\", \"c\": \"La bobine L\", ","_debug_options_count":4},{"id":15530,"question":"La résonance dans un circuit RLC série se produit lorsque :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La résonance se produit lorsque la fréquence de la tension excitatrice est égale à la fréquence propre du circuit, c'est-à-dire 1\/(2π√(LC)).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":15531,"question":"Quelle est l'expression de l'impédance totale Z d'un circuit RLC série ?","option_a":"Z = R + Lω + 1\/(Cω)","option_b":"Z = R² + (Lω - 1\/(Cω))²","option_c":"Z = √(R² + (Lω - 1\/(Cω))²)","option_d":"Z = R - (Lω - 1\/(Cω))","option_e":"","option_f":"","bonne_reponse":"c","explication":"L'impédance Z d'un circuit RLC série est donnée par Z = √(R² + (Lω - 1\/(Cω))²), où ω = 2πf.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Z = R + Lω + 1\/(Cω)\", \"b\": \"Z = R² + (Lω - 1\/(Cω))²\", \"c\": ","_debug_options_count":4},{"id":15532,"question":"Le déphasage φ entre la tension et le courant dans un circuit RLC série est donné par :","option_a":"tan(φ) = (Lω - 1\/(Cω))\/R","option_b":"tan(φ) = R\/(Lω - 1\/(Cω))","option_c":"tan(φ) = (Lω + 1\/(Cω))\/R","option_d":"tan(φ) = R\/(Lω + 1\/(Cω))","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le déphasage φ est donné par tan(φ) = (Lω - 1\/(Cω))\/R, où φ est positif si Lω \u003E 1\/(Cω) (circuit inductif).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"tan(φ) = (Lω - 1\/(Cω))\/R\", \"b\": \"tan(φ) = R\/(Lω - 1\/(Cω))\",","_debug_options_count":4},{"id":15533,"question":"À la résonance, l'impédance du circuit RLC série est minimale.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"À la résonance, l'impédance du circuit RLC série est minimale et égale à R, car Lω = 1\/(Cω).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":15534,"question":"Quelle est la fréquence de résonance f₀ d'un circuit RLC série ?","option_a":"f₀ = 1\/(2π√(LC))","option_b":"f₀ = 1\/(2πL)","option_c":"f₀ = 1\/(2πC)","option_d":"f₀ = √(LC)\/(2π)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La fréquence de résonance f₀ d'un circuit RLC série est donnée par f₀ = 1\/(2π√(LC)).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"f₀ = 1\/(2π√(LC))\", \"b\": \"f₀ = 1\/(2πL)\", \"c\": \"f₀ = 1\/(2","_debug_options_count":4},{"id":15535,"question":"Dans un circuit RLC série, si la fréquence de la tension excitatrice est inférieure à la fréquence de résonance, le circuit est :","option_a":"Inductif","option_b":"Capacitif","option_c":"Résistif","option_d":"En court-circuit","option_e":"","option_f":"","bonne_reponse":"b","explication":"Si f \u003C f₀, alors 1\/(Cω) \u003E Lω, le circuit est capacitif et le courant est en avance sur la tension.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Inductif\", \"b\": \"Capacitif\", \"c\": \"Résistif\", \"d\": \"En court-cir","_debug_options_count":4},{"id":15536,"question":"Le facteur de qualité Q d'un circuit RLC série est défini par :","option_a":"Q = Lω₀\/R","option_b":"Q = R\/(Lω₀)","option_c":"Q = 1\/(R√(LC))","option_d":"Q = √(L\/C)\/R","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le facteur de qualité Q est donné par Q = Lω₀\/R = 1\/(R√(LC)\/L) = √(L\/C)\/R.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Q = Lω₀\/R\", \"b\": \"Q = R\/(Lω₀)\", \"c\": \"Q = 1\/(R√(LC))\", \"d","_debug_options_count":4},{"id":15537,"question":"La bande passante Δf d'un circuit RLC série est donnée par :","option_a":"Δf = f₀\/Q","option_b":"Δf = Q\/f₀","option_c":"Δf = R\/(2πL)","option_d":"Δf = 1\/(2πRC)","option_e":"","option_f":"","bonne_reponse":"a","explication":"La bande passante Δf est donnée par Δf = f₀\/Q, où Q est le facteur de qualité.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Δf = f₀\/Q\", \"b\": \"Δf = Q\/f₀\", \"c\": \"Δf = R\/(2πL)\", \"d\": \"","_debug_options_count":4},{"id":15538,"question":"Dans un circuit RLC série, l'énergie stockée dans la bobine et le condensateur est maximale à la résonance.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"À la résonance, l'énergie stockée dans la bobine et le condensateur est maximale car les réactances s'annulent et l'énergie oscille entre L et C.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]