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单选题
Bottom blow valves are installed on auxiliary water-tube boilers to （）
A
completely drain the boiler in an emergency
B
prevent sludge from forming in the drum
C
remove floating impurities from the boiler water surface
D
remove settled solids from the water drum
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考题
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when the boiler has been secured long enough for most solids to settleB.when the boiler has been cooled to ambient temperatureC.only after raising the water level to within 0.5 inch of the high water cutout onlyD.after bypassing the low pressure
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单选题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.A
seawater contaminationB
frequent surface blowsC
dissolved oxygen deaerationD
frequent bottom blows
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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 cycleB
admit water to the dry pipeC
throttle the forced draft fan output for proper combustionD
reduce excess steam pressure in the boiler
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
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）A
relight the boiler immediately to prevent loss of steam pressureB
relight the fire off the brickwork as the bricks are cherry redC
purge the furnace of any combustible gases before attempting to relight the fireD
speed up the feed pump to prevent dry firing when the burner flame is reestablished
考题
单选题The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A
operating the boiler at less than normal water levelB
installing fins on the firesides of water-tubesC
increasing the amount of excess air to the burnersD
treating the boiler water with chemical oxygen scavengers
考题
单选题In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）A
The safety valve escape piping should be disconnected from the valve body and a blank insertedB
The boiler vent valves should be openedC
All handhole/manhole covers should be tightened up as much as possible to preclude any leaksD
All of the above
考题
单选题The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）A
when the boiler has been secured long enough for most solids to settleB
when the boiler has been cooled to ambient temperatureC
only after raising the water level to within 0~5 inch of the high water cutout onlyD
after bypassing the low pressure
考题
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）A
remove suspended and precipitated solids from the boiler waterB
completely drain the boiler in an emergency situationC
prevent hardened scale deposits in the water drumD
remove floating impurities from the oily water surface
考题
单选题The donkey boiler may be given a bottom blow （）A
to raise water levelB
only while making steamC
to remove scumD
when fire are secured
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Examination of the shell including bottom, side and bow platingB
Examination of sea suctions, overboard discharging valves and sea chestsC
Load testing of lifeboat launching devicesD
Poker gauge of propeller shaft taken
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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Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）A
later and close soonerB
sooner and close laterC
sooner and close soonerD
later and close later
考题
单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A
top of the piston and bottom side of head, with the piston at BDCB
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementD
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
考题
单选题Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）A
clean the flame scanner photocell windowB
Inspect and clean all solenoid valvesC
lift the safety valves by handD
Inspect for oil or water leaks
考题
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）A
double bottom fuel oil tank temperatureB
heater supply steam flowC
pressure of the fuel supplied to the burnersD
attemperator steam flow in the heater discharge circuit
考题
单选题A compound gauge is typically installed on the （）.A
suction side of a bilge pumpB
exhaust manifold of an auxiliary dieselC
discharge line from an air compressorD
chemical feed tank of an evaporator
考题
单选题The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping lossesA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
单选题Starting air valves are held firmly on their seats by（）A
cam rollers on the camshaftB
spring forceC
air pressure on top of the valve differential pistonD
air pressure on the bottom of the valve differential piston
考题
单选题If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）A
low exhaust back pressureB
air in the fuel systemC
gasket blow-by or leakageD
incorrect assembly of idler springs
考题
单选题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A
Clogged air intake faltersB
Piston blow-byC
A defective after-coolerD
Faulty exhaust valves
考题
单选题Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.A
cooling water pumpB
nozzle cooling passagesC
cylinder jacketsD
heat exchanger
考题
单选题If an operating auxiliary boiler has a water pH reading of 7, you should （）.A
bottom blow the boilerB
treat the water with caustic sodaC
treat the water with chemical scavengersD
reduce the water alkalinity to recommended readings
考题
单选题Which action should be taken when an auxiliary boiler in is operation?（）A
Clean all electrical connectionsB
Lift the relief valves by handC
Inspect and clean all solenoid valvesD
Inspect for oil and water leaks
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