轮机英语船舶动力装置章节练习(2017.12.07)

单项选择题
The compressed air is supplied by （） to the air reservoirs.
A.compressors
B.forced fans
C.ventilators
D.generators
单项选择题
Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.
A.make sure
B.be sure
C.assure
D.believe
单项选择题
The pH value of water in a diesel engine closed cooling water system should be maintained between （）.
A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135
单项选择题
For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A.High oxygen concentration
B.Low pH
C.Proper alkalinity
D.All of the above
单项选择题
Cylinder liner cooling is often referred to as （）.
A.piston cooling
B.sleeve cooling
C.central cooling
D.jacket cooling
单项选择题
Camshafts are usually driven by timing gears or （）.
A.push rods
B.chain drives
C.rocker arms
D.flywheels
单项选择题
Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A.sulfite or hydrazine
B.sulfite or hygroscopic sulfite
C.bromide or hydrazine
D.bromide or hygroscopic sulfite
单项选择题
The indications of a scavenge fire are excessive black smoke, （） and peeling from scavenge trunking.
A.turbo-chargers surge
B.spark seen from the drains
C.paint blistering
D.all above are right
单项选择题
An indication of a diesel engine air intake being partially clogged, is （）.
A.low firing pressure and low exhaust temperatures
B.low firing pressure and normal exhaust temperatures
C.high firing pressure and low exhaust temperatures
D.high firing pressure and high exhaust temperatures
单项选择题
An electric heater built into some smaller diesel engines is used to （）.
A.raise lube oil viscosity for easier starting in cold weather
B.increase air inlet temperature
C.increase compression ratio
D.increase jacket water temperature for easier starting in cold weather