1-The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as __________.
A) indicated horsepower
B) brake horsepower *
C) net horsepower
D) friction horsepower
2-Which of the following is an example of a solid bearing?
A) Turbo-generator turbine bearing
B) Thrust bearing
C) Piston pin bushing *
D) Spring bearing
3-The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an __________.
A) automatic follow-up
B) magnetic type coupling
C) muff coupling and release
D) Bendix drive or similar mechanism *
4-Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________.
A) automatically supplied with warmer air on demand
B) automatically supplied with more fuel on demand
C) equipped with standard variable capacity atomizers
D) cycled on and off in response to steam demand *
5-the most common instrument used to measure diesel engine exhaust pressure is the __________.
A) pyrometer
B) bourdon gauge
C) pneumercator
D) manometer *
6-The amount of fuel delivered by a unit injector is controlled by the __________.
A) engine speed
B) main spring
C) camshaft
D) rack position *
7-In a diesel engine lube oil cooler, with sea water cooling the lubricating oil, what statement is true?
A) The lube oil pressure is always kept higher than the sea water pressure, and in case of a lube oil cooler leak, the lube oil sump level will decrease. *
B) The sea water pressure is always kept higher than the lube oil pressure, and in case of a lube oil cooler leak, the lube oil sump level will increase.
C) The sea water pressure is always kept higher than the lube oil pressure, and in case of a lube oil cooler leak, the lube oil sump level will decrease.
D) The lube oil pressure is always kept higher than the sea water pressure, and in case of a lube oil cooler leak, the lube oil sump level will increase.
8-Auxiliary diesel engine electric starting motors use __________.
A) low amperage, high voltage AC power
B) alternating current transformers
C) 400 cycle per second motor-generator power
D) battery power direct current *
9-An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.
A) decrease in maximum cylinder pressure
B) increase in ignition lag
C) decrease in fuel consumption per horsepower-hour *
D) decrease in exhaust manifold pressure
10-Which of the following methods is used to lubricate main propulsion medium-speed diesel engine reduction gears?
A) Oil is sprayed through nozzles at the point of gear mesh. *
B) Oil rings in channels outside the gears dip into oil in the sump and carry it to the gear teeth.
C) The gears run through an open oil sump and oil is carried along on the gear teeth.
D) Oil is pressure fed through internal drilled passages which force oil to the gear's periphery.
11-The tool best suited for cutting pipeline flange gaskets to the correct size is __________.
A) a gasket cutter *
B) a pair of tin snips
C) a jack knife
D) a ball peen hammer
12-What type of bearing is most generally used as an independent main thrust block on merchant ships?
A) Pivoted-shoe thrust bearing. *
B) Split-half journal type bearing.
C) Plain thrust bearing.
D) Single piece bushing.
13-Work that cannot readily be mounted between lathe centers is usually held in a __________.
A) spindle
B) lathe dog
C) crotch center
D) chuck *
14-If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?
A) The refrigerant vapor loses latent heat; the central cooling fresh water loses latent heat.
B) The refrigerant vapor loses sensible heat, the central cooling fresh water gains latent heat.
C) The refrigerant vapor loses latent heat, the central cooling fresh water gains sensible heat. *
D) The refrigerant vapor gains latent heat, the central cooling fresh water loses sensible heat.
15-On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained?
A) Cycling the potable water pump on and off by the action of the potable water hydro pneumatic tank pressure switch in response to system demand changes. *
B) Allowing the potable water pump to run continuously against a shut-off head during periods of zero demand for potable water.
C) Allowing the potable water pump to run continuously while recirculating during periods of zero demand for potable water.
D) Cycling the potable water pump on and off by the action of potable water storage tank level switches in response to system demand changes
16-An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel nozzle because of the __________.
A) high cost of fuel
B) serious fire hazard *
C) pollution hazard
D) poor combustion which will occur in that cylinder
17-Diesel engine jacket water is used in the fresh water distillation process as the __________.
A) means of heating the feedwater *
B) primary means of producing a vacuum within the distiller
C) coolant for the distillate
D) coolant for the brine cooler
18-When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its __________.
A) intake stroke
B) compression stroke
C) power stroke *
D) exhaust stroke
19-Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount?
A) Increased exhaust valve wear *
B) Increased MEP
C) Excessive bearing wear
D) Glazing of the cylinder liners
20-Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oil in sufficient amount, and the __________.
A) cetane number
B) pour point
C) viscosity temperature
D) quality of the oil *
21-Standby, or emergency diesel generator day tanks should always be kept full to reduce the possibility of __________ .
A) sediment contamination
B) fuel filter clogging
C) moisture formation from condensation *
D) inadequate transfer pump suction head
22-When fuel is injected late into a diesel engine cylinder, __________.
A) the exhaust will be clear
B) fuel consumption will be low
C) all the fuel will be burned at top dead center
D) fuel consumption will be high *
23-The function of the after cooler installed between the turbocharger and intake manifold on some diesel engines, is to __________ .
A) increase the density of the intake air *
B) decrease turbocharger power usage
C) reduce exhaust gas temperature
D) compensate for turbocharger RPM fluctuations
24-Sludge formation in a diesel engine lube oil system is caused by __________ .
A) carbonization of oils from the combustion chambers
B) emulsions of lube oil and water
C) coagulation of unburned fuel below the piston rings
D) All of the above. *
25-The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the __________.
A) turbocharger stalls
B) exhaust pressure increases
C) air charge density decreases *
D) scavenge effect increases
26-In diesel engines designed with a crosshead, the motion of the piston rod can be described as __________.
A) reciprocating at the crank pin, rotary at the piston pin
B) straight rotation
C) reciprocating at the piston pin, rotary at the crank pin
D) straight reciprocation *
27-A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.
A) cylinder heads
B) exhaust valves
C) scavenging air *
D) injectors
cevaplar yanlarında yıldız olanlar.göremeyenler dikkatli baksın.
USCG sorularının bazıları zaten tanıdık incelerken farkedeceksiniz zaten.
paylaşıyorum sonra vay ben görmedim duymadım demeyin iyi çalışın sorular hep yenilendi,öyle eskisi gibi ezberle geç olayı bitti, ingilizceye sağlam çalışmak gerekiyo ona göre.
hadi kolay gelsin.
A) indicated horsepower
B) brake horsepower *
C) net horsepower
D) friction horsepower
2-Which of the following is an example of a solid bearing?
A) Turbo-generator turbine bearing
B) Thrust bearing
C) Piston pin bushing *
D) Spring bearing
3-The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an __________.
A) automatic follow-up
B) magnetic type coupling
C) muff coupling and release
D) Bendix drive or similar mechanism *
4-Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________.
A) automatically supplied with warmer air on demand
B) automatically supplied with more fuel on demand
C) equipped with standard variable capacity atomizers
D) cycled on and off in response to steam demand *
5-the most common instrument used to measure diesel engine exhaust pressure is the __________.
A) pyrometer
B) bourdon gauge
C) pneumercator
D) manometer *
6-The amount of fuel delivered by a unit injector is controlled by the __________.
A) engine speed
B) main spring
C) camshaft
D) rack position *
7-In a diesel engine lube oil cooler, with sea water cooling the lubricating oil, what statement is true?
A) The lube oil pressure is always kept higher than the sea water pressure, and in case of a lube oil cooler leak, the lube oil sump level will decrease. *
B) The sea water pressure is always kept higher than the lube oil pressure, and in case of a lube oil cooler leak, the lube oil sump level will increase.
C) The sea water pressure is always kept higher than the lube oil pressure, and in case of a lube oil cooler leak, the lube oil sump level will decrease.
D) The lube oil pressure is always kept higher than the sea water pressure, and in case of a lube oil cooler leak, the lube oil sump level will increase.
8-Auxiliary diesel engine electric starting motors use __________.
A) low amperage, high voltage AC power
B) alternating current transformers
C) 400 cycle per second motor-generator power
D) battery power direct current *
9-An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.
A) decrease in maximum cylinder pressure
B) increase in ignition lag
C) decrease in fuel consumption per horsepower-hour *
D) decrease in exhaust manifold pressure
10-Which of the following methods is used to lubricate main propulsion medium-speed diesel engine reduction gears?
A) Oil is sprayed through nozzles at the point of gear mesh. *
B) Oil rings in channels outside the gears dip into oil in the sump and carry it to the gear teeth.
C) The gears run through an open oil sump and oil is carried along on the gear teeth.
D) Oil is pressure fed through internal drilled passages which force oil to the gear's periphery.
11-The tool best suited for cutting pipeline flange gaskets to the correct size is __________.
A) a gasket cutter *
B) a pair of tin snips
C) a jack knife
D) a ball peen hammer
12-What type of bearing is most generally used as an independent main thrust block on merchant ships?
A) Pivoted-shoe thrust bearing. *
B) Split-half journal type bearing.
C) Plain thrust bearing.
D) Single piece bushing.
13-Work that cannot readily be mounted between lathe centers is usually held in a __________.
A) spindle
B) lathe dog
C) crotch center
D) chuck *
14-If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?
A) The refrigerant vapor loses latent heat; the central cooling fresh water loses latent heat.
B) The refrigerant vapor loses sensible heat, the central cooling fresh water gains latent heat.
C) The refrigerant vapor loses latent heat, the central cooling fresh water gains sensible heat. *
D) The refrigerant vapor gains latent heat, the central cooling fresh water loses sensible heat.
15-On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained?
A) Cycling the potable water pump on and off by the action of the potable water hydro pneumatic tank pressure switch in response to system demand changes. *
B) Allowing the potable water pump to run continuously against a shut-off head during periods of zero demand for potable water.
C) Allowing the potable water pump to run continuously while recirculating during periods of zero demand for potable water.
D) Cycling the potable water pump on and off by the action of potable water storage tank level switches in response to system demand changes
16-An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel nozzle because of the __________.
A) high cost of fuel
B) serious fire hazard *
C) pollution hazard
D) poor combustion which will occur in that cylinder
17-Diesel engine jacket water is used in the fresh water distillation process as the __________.
A) means of heating the feedwater *
B) primary means of producing a vacuum within the distiller
C) coolant for the distillate
D) coolant for the brine cooler
18-When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its __________.
A) intake stroke
B) compression stroke
C) power stroke *
D) exhaust stroke
19-Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount?
A) Increased exhaust valve wear *
B) Increased MEP
C) Excessive bearing wear
D) Glazing of the cylinder liners
20-Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oil in sufficient amount, and the __________.
A) cetane number
B) pour point
C) viscosity temperature
D) quality of the oil *
21-Standby, or emergency diesel generator day tanks should always be kept full to reduce the possibility of __________ .
A) sediment contamination
B) fuel filter clogging
C) moisture formation from condensation *
D) inadequate transfer pump suction head
22-When fuel is injected late into a diesel engine cylinder, __________.
A) the exhaust will be clear
B) fuel consumption will be low
C) all the fuel will be burned at top dead center
D) fuel consumption will be high *
23-The function of the after cooler installed between the turbocharger and intake manifold on some diesel engines, is to __________ .
A) increase the density of the intake air *
B) decrease turbocharger power usage
C) reduce exhaust gas temperature
D) compensate for turbocharger RPM fluctuations
24-Sludge formation in a diesel engine lube oil system is caused by __________ .
A) carbonization of oils from the combustion chambers
B) emulsions of lube oil and water
C) coagulation of unburned fuel below the piston rings
D) All of the above. *
25-The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the __________.
A) turbocharger stalls
B) exhaust pressure increases
C) air charge density decreases *
D) scavenge effect increases
26-In diesel engines designed with a crosshead, the motion of the piston rod can be described as __________.
A) reciprocating at the crank pin, rotary at the piston pin
B) straight rotation
C) reciprocating at the piston pin, rotary at the crank pin
D) straight reciprocation *
27-A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.
A) cylinder heads
B) exhaust valves
C) scavenging air *
D) injectors
cevaplar yanlarında yıldız olanlar.göremeyenler dikkatli baksın.
USCG sorularının bazıları zaten tanıdık incelerken farkedeceksiniz zaten.
paylaşıyorum sonra vay ben görmedim duymadım demeyin iyi çalışın sorular hep yenilendi,öyle eskisi gibi ezberle geç olayı bitti, ingilizceye sağlam çalışmak gerekiyo ona göre.
hadi kolay gelsin.