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名词解释题
Motor
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Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM
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______ of the following statements is（are）correct regarding motor lifeboats on cargo vessels．① The motor of each lifeboat shall be operated in the ahead and astern position for a period of not more than 5 minutes once in each week；② The fuel tank of all motor-propelled lifeboats shall be emptied and the fuel changed at least once in every year．A.① onlyB.② onlyC.Both ① and ②D.Neither ① nor ②
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Under no circumstances______without looking carefully to the rear.
A.should one back up a motor vehicle
B.a motor vehicle should back up
C.one should back up a motor vehicle
D.should back up a motor vehicle
考题
执行指令（）可实现STR12-280机器人左右平移步进电机向左平移10000步。A、motor_sj_bs（1，10000）；B、motor_zy_bs（1，10000）；C、motor_qh_bs（1，10000）；D、DJ2_XPY（zpy）；
考题
实现STR12-280机器人升降步进电机下降10000步的是（）。A、motor_sj_bs（1，10000）；B、motor_zy_bs（0，10000）；C、motor_qh_bs（1，10000）；D、motor_sj_bs（0，10000）；
考题
下列STR12-280机器人例程函数中调用格式正确的是（）。A、motor_sj_bs（1）B、motor_qh_bs（1，1000）C、motor_sj_bs（1，70000）D、motor_zy_yd（1，1000）
考题
单选题The overcurrent relay （） the motor contactor when the motor exceeds its rated current.A
connectsB
tripsC
foulsD
destructs
考题
单选题操作完后，关掉电动机。（）A
After operation, start the electric motor.B
Before operation, stop the electric motor.C
Before operation, start the electric motor.D
After operation, stop the electric motor.
考题
单选题An AC synchronous transmission type remote steering control system consists of a （）.A
transmitter at the steering station and a receiver at the steering engineB
reversible motor at the steering station geared to the steering pumpsC
small induction motor on the bridge which controls the redder through pulleysD
variable displacement hydraulic pump driven by a reversible DC motor
考题
单选题The （）, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.A
single phaseB
two phaseC
three phaseD
four phase
考题
单选题“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）A
a centrifugeB
an electric motorC
a bowl assemblyD
a driving motor
考题
单选题“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 380B
the armature terminals of the motor should be connected in star formation when voltage of power supply is 220C
both A and B are correctD
the armature terminals of the motor should be connected in reverse ways of A and B
考题
单选题The energy consumed by an AC motor, as strictly reactive power, is （）A
used to do mechanical workB
used to establish the magnetic field of the motorC
lost as heat generated by the windingsD
lost in doing work to turn the motor itself
考题
单选题Ambient temperature is the （）.A
amount of temperature rise with no loadB
temperature of the compartment where the motor is locatedC
normal operating temperature, less the room temperatureD
amount of temperature developed by an operating motor
考题
单选题In a fixed displacement axial piston hydraulic motor, the speed is varied by（）A
regulating the ratio between torque and speed via the torque limiter at the motorB
directing the motor output flow through a bypass lineC
maintaining a constant flow and pressure inputD
controlling the input flow rate
考题
单选题What type of electric motor is most commonly used on board ship?（）A
non-synchronous electric motorB
synchronous electric motorC
fully enclosed electric motorD
watertight electric motor
考题
单选题The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.A
camshaft；fresh airB
camshaft；starting airC
electronic motor which is controlled by a computer；fresh airD
electronic motor which is controlled by a computer；starting air
考题
单选题When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a （）.A
loose expansion valve control bulbB
low differential setting on the H-PcutoutC
blown fuse in the motor circuitD
faulty suction pressure regulator
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