單項(xiàng)選擇題Which of the following pumps is most suitable for an oily water separator?（）

A.reciprocating pump
B.vane pump
C.mono pump
D.axial-flow pump


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1.單項(xiàng)選擇題With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題Which of the following equipment is not pollution prevention equipment?（）

A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator

4.單項(xiàng)選擇題The initial voltage of self-excitation generator set up by（）

A.residual magnetism
B.voltage regulator
C.electrical current for excitation
D.the other running generator

5.單項(xiàng)選擇題“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 voltage of power supply is 380
B.the armature terminals of the motor should be connected in star formation when voltage of 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