内河轮机电气试题精选,专门针对大管轮的（The inland river turbine electrical examination question selects, specially aims at the big pipe wheel）.doc

内河轮机电气试题精选,专门针对大管轮的（The inland river turbine electrical examination question selects, specially aims at the big pipe wheel） 1. to expand the range of ammeter shunt resistance increases, the measurable range of current ______. A. decreases B., increases C., and D. remains unchanged Answer A 2. wattmeter voltage coil number ______, thinner wires, and the load ______. A. less / less series B. / parallel C. more / series D. more / parallel Answer D 30 thousand meter is composed of ______ etc.. A. header, measuring line and switch B. head, measuring circuit and shell C. header, switch, and shell D. header, measuring line, switch and shell Answer D 4. rotor windings of three-phase asynchronous motor, when winding winding is ______, squirrel cage winding is ______. A. open / closed B. closed / closed C. open / open D. closed / open circuit Answer B 5. asynchronous motor using Y - conversion method of starting, starting current and direct current when starting is ______, starting torque and starting torque direct ratio ______. A. 1/3, 1/3 B. 1/3, 1 C. 1, 1/ D., Answer A 6. asynchronous motor in the motor working state, the slip S for ______. A. S1 B. S=0 C. 0S1 D. S0 Answer C 7. single-phase capacitor induction motor in order to obtain the large starting torque, in ______. A. starting winding series capacitor B. working winding upper series capacitor Series resistance of D. starting winding on C. working winding Answer A 8. three-phase asynchronous motor at light load, three power line broke a root, then there will be ______ phenomenon. A. energy consumption braking, until the stop B. motor continues to run, but the current increases, the motor is seriously fever C. reverse braking, motor reversal D., due to mechanical friction exists, the motor slowly stop Answer B 9. when the synchronous generator with inductive load (such as motor), the armature reaction ______. A. only has direct axis demagnetization reaction, B. only has cross axis reaction C. only has the direct axis