Quiz — Eljeddi - Dipôle RL.pdf

Question 1 sur 10 20:00

[{"id":12888,"question":"Quelle est l'unité de l'inductance L dans le SI ?","option_a":"Henry (H)","option_b":"Farad (F)","option_c":"Ohm (Ω)","option_d":"Volt (V)","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'inductance L s'exprime en Henry (H) dans le Système International. 1 H = 1 Wb\/A (Weber par Ampère).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Henry (H)\", \"b\": \"Farad (F)\", \"c\": \"Ohm (Ω)\", \"d\": \"Volt (V)\"}}","_debug_options_count":4},{"id":12889,"question":"En régime permanent, le dipôle RL se comporte comme :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. En régime permanent (après plusieurs constantes de temps), la bobine se comporte comme un fil de résistance nulle (court-circuit idéal).","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":12890,"question":"La tension aux bornes d'une bobine est proportionnelle à :","option_a":"La résistance R","option_b":"La dérivée du courant di\/dt","option_c":"La tension appliquée U","option_d":"La fréquence du courant","option_e":"","option_f":"","bonne_reponse":"b","explication":"","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La résistance R\", \"b\": \"La dérivée du courant di\/dt\", \"c\": \"La","_debug_options_count":4},{"id":12891,"question":"La constante de temps τ d'un circuit RL est égale à :","option_a":"R\/L","option_b":"L\/R","option_c":"R·L","option_d":"1\/(R·L)","option_e":"","option_f":"","bonne_reponse":"b","explication":"La constante de temps τ = L\/R (en secondes) caractérise l'évolution temporelle du courant dans le circuit RL.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"R\/L\", \"b\": \"L\/R\", \"c\": \"R·L\", \"d\": \"1\/(R·L)\"}}","_debug_options_count":4},{"id":12892,"question":"L'énergie magnétique stockée dans une bobine est maximale lorsque :","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. L'énergie magnétique E = ½LI² est maximale lorsque le courant I est maximal (régime permanent).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":12893,"question":"Quelle est la relation entre la tension U aux bornes d'un dipôle RL et le courant I ?","option_a":"U = R·I","option_b":"U = L·I","option_c":"U = R·I + L·di\/dt","option_d":"U = L·di\/dt - R·I","option_e":"","option_f":"","bonne_reponse":"c","explication":"La tension aux bornes d'un dipôle RL est la somme de la tension aux bornes de la résistance (R·I) et de la bobine (L·di\/dt).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"U = R·I\", \"b\": \"U = L·I\", \"c\": \"U = R·I + L·di\/dt\", \"d\": \"U =","_debug_options_count":4},{"id":12894,"question":"Un circuit RL est alimenté par une tension constante. Après combien de τ le courant atteint-il 99% de sa valeur finale ?","option_a":"1τ","option_b":"3τ","option_c":"5τ","option_d":"10τ","option_e":"","option_f":"","bonne_reponse":"c","explication":"Après 5τ, le courant atteint environ 99,3% de sa valeur finale (règle des 5 constantes de temps).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"1τ\", \"b\": \"3τ\", \"c\": \"5τ\", \"d\": \"10τ\"}}","_debug_options_count":4},{"id":12895,"question":"La bobine s'oppose-t-elle aux variations de courant ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. La bobine génère une force électromotrice d'auto-induction qui s'oppose aux variations de courant (loi de Lenz).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":12896,"question":"Quelle est l'expression de la tension aux bornes de la résistance R dans un dipôle RL ?","option_a":"u_R = L·di\/dt","option_b":"u_R = R·I","option_c":"u_R = U - L·di\/dt","option_d":"u_R = ½LI²","option_e":"","option_f":"","bonne_reponse":"b","explication":"La tension aux bornes d'une résistance est donnée par la loi d'Ohm : u_R = R·I.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"u_R = L·di\/dt\", \"b\": \"u_R = R·I\", \"c\": \"u_R = U - L·di\/dt\", \"d","_debug_options_count":4},{"id":12897,"question":"En régime transitoire, le courant dans un circuit RL évolue selon une fonction :","option_a":"Linéaire","option_b":"Exponentielle","option_c":"Logarithmique","option_d":"Parabolique","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le courant dans un circuit RL en régime transitoire suit une évolution exponentielle : I(t) = I_final (1 - e^(-t\/τ)).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Linéaire\", \"b\": \"Exponentielle\", \"c\": \"Logarithmique\", \"d\": \"Par","_debug_options_count":4}]