更多"The engine is reversed by axial dis"的相关试题:
[单项选择]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 motor
B. directing the motor output flow through a bypass line
C. maintaining a constant flow and pressure input
D. controlling the input flow rate
[单项选择]For an ordinary modem marine four-stroke engine the inlet valves close （）.
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单项选择]Engine displacement is equal to the cylinder （）.
A. area times the stroke
B. area times the stroke, times the number of cylinders
C. volume times the stroke
D. volume times the stroke, times the number of cylinders
[单项选择]In a diesel engine, a positive displacement type blower is usually （）
A. gear drive by the engine
B. driven by an exhaust gas turbine
C. driven by a camshaft
D. driven by separate motor
[单项选择]Immediately after any diesel engine is started, the engineer should check the （）
A. crankcase pressure
B. lube oil pressure
C. saltwater pressure
D. exhaust temperature
[单项选择]In the construction of a diesel engine, what is the purpose of end plates?（）
A. To provide accessibility to the cylinder liners
B. To add stability to the engine block
C. To add rigidity to the block and a surface for attaching other parts
D. To make a surface for the base
[单项选择]Engine operating conditions may be indicated by the color of the exhaust smoke.Black smoke could indicate（）
A. an insufficient speed droop setting
B. an overloaded engine
C. clogged drain holes in the oil control rings
D. complete combustion
[单项选择]In heavy marine engine the practice is to drive the engine on（）which has previously been stored in starting air reservoirs.
A. electric motor
B. hydraulic motor
C. compressed air
D. turning gear
[单项选择]Displacement refers to the（）.
A. cubic capacity of a vessel
B. deadweight carring capacity of a vessel
C. gross tonnage of vessel
D. number of long tons of water displaced by a vessel afloat
[单项选择]A variable displacement system of hydraulic drives consists of （）.
A. a variable displacement axial piston pump
B. a constant displacement axial piston pump
C. a reciprocating piston pump
D. a centrifugal pump
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[单项选择]The output volume of a positive fixed displacement pump can be changed only by （）.
A. changing the angle of the tilting plate
B. changing the speed of the pump
C. moving the slide block and rotor
D. moving the shaft trunnion block
[单项选择]Positive displacement, helical gear pumps are well suited for pumping oil because （）
A. stuffing boxes eliminate the leakage problems usually associated with other gear pumps
B. it is not necessary to closely maintain design clearances with this pump
C. they are essentially self-priming and produce a high suction lift
D. these pumps are designed with extreme tooth angled
[单项选择]Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid （） pressure.
A. depending on
B. in relative to
C. regardless of
D. because of
[单项选择]Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.
A. open the bypass line
B. cut in the lube oil cooler
C. pressurize the lube oil system
D. top off the expansion tank
[单项选择]Attempts are made to eliminate axial thrust in centrifugal pump by （）.
A. providing the impeller with balancing holes
B. the use of symmetrical impeller
C. neither A nor B
D. either A or B
[单项选择]The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A. slide block
B. tilting box
C. pintle
D. reaction ring
[单项选择]If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
A. at each control station
B. in the chief engineer’s quarters
C. in the captains quarters
D. All of the above are correct
[单项选择]A diesel engine is similar to a gasoline engine except that the former has no （）.
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
