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单选题
The purpose of the safety relief valves installed on an auxiliary boiler is to （）.
A
relieve excess fuel oil pressure during the “off” fire cycle
B
admit water to the dry pipe
C
throttle the forced draft fan output for proper combustion
D
reduce excess steam pressure in the boiler
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How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?A.With gooseneck ventsB.With warning signsC.With flame screensD.With pressure-vacuum relief valves
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All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves
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单选题What is the purpose of pressure-vacuum relief valves? （）A
Regulation of discharge pressure from cargo pumpsB
Maintaining constant velocity in cargo linesC
Regulation of suction head on cargo pumpsD
To maintain a tank or void at atmospheric pressure
考题
单选题Cargo pump relief valves are piped to the（）.A
cargo pump pressure gaugesB
crossover lines interconnecting two pumpsC
suction side of pumpsD
atmosphere through pump vents
考题
单选题Most hydraulic steering gears are fitted with relief valves which（）A
function when the rudder is amidshipsB
relieve excess whip pressure from the hydraulic oil systemC
protect the piping assembly from external rudder shockD
relieve excessive telemotor pressure
考题
单选题The safety valves should be tested and adjusted when the boiler survey is （）A
completedB
carried outC
cleanedD
steamed
考题
单选题The safety valves are mounted in pairs to （） the boiler against overpressure.A
useB
releaseC
protectD
effect
考题
单选题Blow-off of the relief valves of the main cylinders during operation indicates （）.A
the cylinder cover is crackedB
the injector holes is cloggedC
the cams are not properly setD
fuel pump is leaking
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单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）A
Plugged injector nozzlesB
Excessive fuel injectionC
Very late injection timingD
Incorrect crankshaft clearance
考题
单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.A
set the relief valveB
check the lubrication systemC
vent the pump casingD
open the pump suction and discharge valves
考题
单选题Overload protection on hydraulic system is provided by the use of （）.A
stop valvesB
pressure relief valvesC
balance valvesD
regulating speed valves
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单选题Blow-off of the relief valves of the engines cylinders may be caused by （）.A
too low leadB
water in fuelC
too tight springD
leakage
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单选题What is the purpose of the intake/exhaust valves in a diesel engine? （）A
They regulate the combustion cycleB
They supply cooling waterC
They synchronize the ignition sparkD
They supply and regulate the lubricant flow
考题
单选题Before the oily water is installed on board ships, it must have （）A
IOPPB
type approval certificateC
cargo ship safety equipment certificateD
cargo ship safety certificate
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单选题If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）A
backfire through the air intakesB
develop less power under loadC
have high firing pressuresD
lift its cylinder relief valves
考题
单选题Safety valves on a boiler vent to the （）.A
fuel tankB
bilgeC
atmosphereD
auxiliary exhaust line
考题
单选题A relief valve for a cargo pump is generally installed（）.A
after the discharge valveB
between the pump and discharge valveC
after the suction valveD
between the pump and suction valve
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单选题When air becomes trapped in the hydraulic fluid of a steering system, the （）.A
rudder will respond sluggishlyB
hydraulic rams will over-speedC
sight glass will show bubblesD
ram relief valves will lift
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单选题（） supplies pilot air to control the cylinder air start valves.A
An air compressorB
An indicator cockC
An air distributorD
A safety valve
考题
单选题（） should be tested and adjusted when the boiler survey is carried out.A
The boiler oil tankB
The steam pipeC
The fire sideD
The safety valves
考题
单选题What is the purpose of a relief valve?（）A
to fill 2 tanks at the same timeB
to use pump at a higher pressureC
to return liquid to suction side if discharge valve is closedD
All of the above are true
考题
单选题In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）A
fuel valves；exhaust valveB
exhaust valves；inlet valveC
fuel valves；inlet valveD
exhaust valves；fuel valve
考题
单选题The purpose of the GMDSS is to（）safety of life and property at sea all over the world.A
promoteB
improveC
guaranteeD
bothA and B
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