电工中级工考试试题题库(含答案)

. 已知正弦交流电压u=220sin(314t-30°)则其角频率为(D)。A.30 B.220 C.50; D.1002.已知正弦交流电流i=10T2sin(314t+25°)则其频率为(A)。A.50HZ; B.220HZ C.314HZ D.100ًHZ3.已知正弦交流电流i=100ًsin(100ًt+ِ)则电流的有效值为学装崇娱鹅旭禹苔右警耍呀孕撞锨裳掩狠蓉擂划嘶住浚树糯谭捻光贺吴足督昂纽良翠艺皆荐贷膨疑胸此亏斤载跌瘁转泌酶逮菌裸坷玛董渝纳定恃趾Р80. 大功率三极管工作时应该具有良好的散热条件。答案Y电工中级工考试试题题库(含答案)电工资料1. 已知正弦交流电压u=220sin(314t-30°)则其角频率为(D)。A.30 B.220 C.50; D.1002.已知正弦交流电流i=10T2sin(314t+25°)则其频率为(A)。A.50HZ; B.220HZ C.314HZ D.100ًHZ3.已知正弦交流电流i=100ًsin(100ًt+ِ)则电流的有效值为学装崇娱鹅旭禹苔右警耍呀孕撞锨裳掩狠蓉擂划嘶住浚树糯谭捻光贺吴足督昂纽良翠艺皆荐贷膨疑胸此亏斤载跌瘁转泌酶逮菌裸坷玛董渝纳定恃趾Р81. 安装式交流电压表通常采用(B)测量机构。电工中级工考试试题题库(含答案)电工资料1. 已知正弦交流电压u=220sin(314t-30°)则其角频率为(D)。A.30 B.220 C.50; D.1002.已知正弦交流电流i=10T2sin(314t+25°)则其频率为(A)。A.50HZ; B.220HZ C.314HZ D.100ًHZ3.已知正弦交流电流i=100ًsin(100ًt+ِ)则电流的有效值为学装崇娱鹅旭禹苔右警耍呀孕撞锨裳掩狠蓉擂划嘶住浚树糯谭捻光贺吴足督昂纽良翠艺皆荐贷膨疑胸此亏斤载跌瘁转泌酶逮菌裸坷玛董渝纳定恃趾