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单选题
In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）
A
the temperature of the hydraulic fluid
B
the flow rate of the hydraulic fluid
C
the temperature of the cooling water
D
all of the above
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考题
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考题
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考题
单选题What type of valve is used to direct the flow of hydraulic fluid?（）A
Relief valveB
Direction control valveC
Stop valveD
Pressure control valve
考题
单选题In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）A
molecular fluid vibrationB
energy lossesC
wide pressure variationsD
mechanical damage to control valves
考题
单选题The major source of chemical contaminants in hydraulic fluid is （）.A
microscopic steel shavingsB
abrasive wasteC
anti-oxidant compoundsD
oxidation by-products
考题
单选题The most common contaminate of governor hydraulic fluid is （）.A
moistureB
dirtC
acidD
air
考题
单选题A hydraulic accumulator aboard a ship is designed to（）.A
store fluid under pressureB
act as a fluid reservoirC
provide overpressure reliefD
replenish fluid to a system
考题
单选题If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.A
add fluid that is the same color as the fluid in the reservoirB
add turbine oil because it is always a good substituteC
add any oil that has the same viscosity as the hydraulic fluidD
check the winch manufacturers instruction book
考题
单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）A
drain the accumulators and purge with oxygenB
bleed off all stored energy from the accumulators completelyC
charge the accumulators to prevent system energy lossD
pump the hydraulic fluid into the accumulators to prevent fluid loss
考题
单选题The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）A
CrossB
ParallelC
CounterD
Circular
考题
单选题In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）A
Constant tension mooring winch systemB
Hatch cover systemC
Watertight door systemD
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考题
单选题An orifice-check valve placed in a hydraulic system is used to（）A
regulate the fluid flow in either directionB
restrict movement of hydraulic fluid in one direction, but allow free movement in the other directionC
allow free movement of hydraulic fluid in both directionsD
allow a restricted fluid flow in one direction only
考题
单选题The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）A
dirtB
fuel oilC
governor cooling waterD
fuel oil tars
考题
单选题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
考题
单选题How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）A
clean the fittings before they are disconnectedB
Place drip pans under leaky fittingsC
Seal any cracks in lines with PermatexD
Coat all threads with graphite oil
考题
单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）A
compensate for major leaks in the systemB
maintain the original fluid viscosityC
allow for changes in pressure and temperature within the systemD
assure constant fluid temperature
考题
单选题Which of the following statements is/are true regarding hydraulic pumps in general? （）A
Variable volumes can be obtained with gear pumps only by variation of the pump drive speedB
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaftC
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plateD
All of the above
考题
单选题A hydraulic accumulator is designed to（）.A
store fluid under pressureB
act as a fluid reservoirC
provide overpressure reliefD
replenish fluid to a system
考题
单选题Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.A
fluid frictionB
fluid turbulenceC
component misalignmentD
pressure surges
考题
单选题In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）A
the temperature of the hydraulic fluidB
the flow rate of the hydraulic fluidC
the temperature of the cooling waterD
all of the above
考题
单选题Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.A
hydraulic fluid contaminationB
excessive fluid frictionC
turbulent fluid flowD
fluid pressure surges
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