文档介绍：修高压电机、高压电机修理、维修高压电机质量信得过维修有保证
(Repair high voltage motor, high voltage motor repair and
maintenance, high voltage motoso as to save the cooling water. What are the advantages of the 7~8 B multi effect evaporation operation? (A) increasing output
, saving heating steam and cooling water (C), saving equipment cost (D) and saving vacuum cost. When the 7-9 B three effect evaporator is operated, what is the pressure of each effect? (A) first effect 二 second effect 二 third effect ⑻ first effect > second effect > third effect (C) first effect < second effect 〈 third effect (D) not necessarily, visual situation change. When the 7-10 B three effect evaporator opera tes, where does the second effec t hea t come from? (A) st earn boiler (B), the first effective stearn generator (C), the third effect of stearn generation (D), the second effect of st earn generation. 7-11 C the following description is correct? (A) plan to concentrate into concentrated sugar cane, to be
dist订led (B) alcohol aqueous solution to increase the alcohol concentration, available for evaporation (C) hydrogen chloride gas producing hydrochloric acid, must use the absorption operation (D) isolated from soybean oil in bulk, must use dist订lation (E) none of the above. When 7-12 A evaporates, the vacuum pump is usually connected at the evaporating vapor outlet. What is the purpose of the vacuum pump? (A) increased with the increase of temperature in the heating pipe, so as to increase the heat transfer rate (B) to reduce the temperature in the heating pipe, so as to increase the heat transfer rate
of the solution viscosity decreased, which increases the heat transfer rate (D) of the solution viscosity decreased, to prevent the generation of bubbles (E) to make the power required for evaporator the (pump) to reduce. What are the advantages of a 7~13 E vertical tube evaporator over a horizontai tube evaporator? (A) has better heat transfer rate ⑻ better convection effect solution (C) fouling in the tube,