高压类理论考试题(2008年a2卷)（High voltage theory examination questions (2008, A2 volume)）.docVIP

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高压类理论考试题(2008年a2卷)（High voltage theory examination questions (2008, A2 volume)）.doc

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高压类理论考试题(2008年a2卷)（High voltage theory examination questions (2008, A2 volume)）

高压类理论考试题(2008年a2卷)（High voltage theory examination questions (2008, A2 volume)） The national electrical network operating license examination High class theory exam (2008 A2) A single choice (options for each question, only one of the most to do, 1 points for each question, the wrong election or not is 0 points, a total of 40 points) 1. in the analysis of user load rate, load selection 24h a day for one hour (C) as the highest peak load. A. B. C. calculated load maximum load average load 2. a sudden interruption of power supply caused little loss or not directly caused by the loss of load is the load (C). A class of A. B. two C. three 3. voltage transformer voltage transformer and is measured by use of (C). A. charging voltage transformer B. insulated voltage transformer voltage transformer protection C. 4. in large transformers, the forced oil circulation air cooler, the cooling medium in the cooler is (C). A. B. C. oil water air 5. transformer silicon steel sheet are mainly used (C) and cold two. A. overlapping B. concentric type C. hot rolling 6. current transformer (C) is the current in the current or low pressure system changes in the small current low standard. A. Low voltage system B. DC system C. high voltage system 7. transformer primary winding in rated voltage, two secondary windings with load operation, the voltage two times the size of the load power factor (C) and the size of the change. A. load loss B. excitation impedance C. load current size size 8. transformer (B) is a kind of electrical equipment. A. B. C. static rotating motion 9. pilot projects of transformer oil is generally simplified test, dielectric loss test and (A). A. pressure test of B. lubrication test C. sampling test The provisions of national standards of 10., during the operation of the transformer temperature of its surroundings is the highest (A). 40 C A. B.45 C.50 OC 11. transformer iron core is composed of two parts (B) and iron yoke. A. B. C. iron core coil insulation casing 12