一台绕线转子感应电动机,已知P N =75kW,U N1 =380V,n N =720r/min,I N1 =148A,η N =90.5%,cosΦ N1 =0.85,λ m =2.4,E N2 =213V,I N2 =220A,若采用回馈制动下放负载,已知转子每入电阻为0.04Ω,负载转矩为0.8T N ,求此时电动机的转速。
【简答题】Section 5 Understand Texts P5A.Read the dialogue or passage and choose the best answer. The management of the food and beverage department has been described as the mos...
【单选题】Section 5 Understand Texts P5 A.Read the dialogue or passage and choose the best answer. The management of the food and beverage department has been described as the most...
【单选题】Section 5 Understand Texts P5 A.Read the dialogue or passage and choose the best answer. The management of the food and beverage department has been described as the most...
A.
The purchasing, receiving, storing, issuing and preparing of food.
B.
The training, motivating, and controlling of all food and beverage department staff.
【简答题】Read the first unit of the student handbook and edit a dialogue in groups to introduce each other's basic information. The following information is required: 1. Different types of greeting; 2. Set the...
【简答题】Section 5 Understand Texts P5A.Read the dialogue or passage and choose the best answer. The management of the food and beverage department has been described as the mos...