輪機英語船舶電氣與船舶安全單項選擇題每日一練(2019.01.17)

單項選擇題
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
A.permanent loss of pump suction
B.worn shaft seals
C.high level in the oil sump
D.low motor RPM
單項選擇題
The in the steering gear move the rudder to the required angel（）
A.control equipment
B.power unit
C.transmission mechanisms
D.fittings and pipeline
單項選擇題
This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.
A.a manual closed loop
B.a manual opened loop
C.an automatic closed loop
D.an automatic opened loop
單項選擇題
What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）
A.Crankshaft revolution
B.Type of engine (diesel or gasoline)
C.Distance a piston travels during a stroke
D.Number of pistons
單項選擇題
The （）is used to measure power.
A.ammeter
B.voltmeter
C.wattmeter
D.frequency meter

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