单项选择题

The voltage output of an AC generator is controlled by（）

A.varying the DC exciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of the prime mover
D.shorting out part of the armature windings

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热门试题

单项选择题If two AC generators are operated in parallel, the load is distributed evenly by（）

A.a rheostat
B.a balancing coil
C.changing field excitation
D.adjusting the governor settings

单项选择题What would the amps be at 240 volts with an 8 ohm resistance?（）

A.32~5 amps
B.25 amps
C.1~5 amps
D.30 amps

单项选择题The actual rudder angle reading is（）

A.the rudder angle indicator reading
B.the desired rudder angle reading
C.the measured rudder angle reading
D.the intended rudder angle reading

单项选择题According to the passage, during the tests,（）

A.the rudder should be moved through its full extent
B.the rudder should be moved in starboard direction
C.the rudder should be moved with the ship at maximum speed
D.the rudder should be moved with the ship at minimu

单项选择题Which of the following is NOT true according to the passage?（）

A.Both the main steering gear and the auxiliary steering gear should be operated
B.The alarms fitted to the remote control system should be operated
C.The emergency generator compartment should be checked
D.The communication system between the bridge and the steering gear compartment should be operated