Synchronous同步

An AC synchronous transmission type remote steering control system consists of a _____.

A:transmitter at the steering station and a receiver at the steering engine B:reversible motor at the steering station geared to the steering pumps C:small induction motor on the bridge which controls the redder through pulleys D:variable displacement hydraulic pump driven by a reversible DC motor

The function of damper windings in a synchronous motor is to _____.

A:eliminate slippage B:provide excitation C:provide starting torque D:increase efficiency

The most common source of excitation for synchronous motors is a/an _____.

A:low voltage battery B:motor attenuator set C:DC exciter generator D:AC supply

In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in .

A:the pump going to full stroke B:closing of the six-way valve C:driving the rams up against the stops D:a corresponding slowing or increasing of the pumped flow rate

The function of synchronous compensating machine is to .

A:improve power factor B:reduce voltage oscillation C:increase the insulation of circuits D:eliminate regenerated magnetic fields

The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequency 50HzYou can infer that the number of magnetic poles is .

A:2 B:4 C:6 D:8

“380V/220V Y/ △” noted on the nameplate of a non-synchronous motor means that .

A:the armature terminals of the motor should be connected in star formation when voltageof power supply is 380 B:the armature terminals of the motor should be connected in star formation when voltageof power supply is 220 C:both A and B are correct D:the armature terminals of the motor should be connected in reverse ways of A and B

The DC excitation to the field of brushless synchronous is generally produced by .

A:an exciter driven by the same shaft with the generator B:an exciter driven by external prime mover C:generator itself D:either A and B

The frequency of the alternating current generated by a synchronous generator is governed by the speed and the .

A:full excitation B:load C:power factor D:number of poles