更多"Gear-type flexible couplings are of"的相关试题:
[单项选择]Copper is often used as an electrical conductor because it （）.
A. has high resistance at low temperatures
B. has a highly polished surface
C. is able to pass current with little opposition
D. holds insulation together well
[单项选择]Nylon rope is often used in the makeup of a towline because it（）.
A. floats
B. stretches
C. handles easily
D. resists rot
[单项选择]In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
A. an diesel oil heater
B. a waste heat boiler
C. a fresh water generator
D. all the above
[单项选择]One advantage of dry cylinder liners used in a diesel engine is the（）
A. lower thermal expansion rates than wet liners
B. greater heat transfer rate than wet liners
C. greater wear resistance than wet liners
D. procedure to replace dry liners is simpler than for wet liners
[单项选择]Fire hose couplings（）.
A. are made of bronze，brass，or soft alloy metals
B. should be painted red in order to identify hose lengths
C. are specially hardened to prevent crushing
D. should be greased frequently
[单项选择]The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.
A. in which
B. on which
C. to which
D. by which
[单项选择]Diesel engine fuel oil contamination often results in （）
A. governor malfunctions
B. fuel injection system malfunctions
C. high cylinder lube oil temperatures
D. low intake temperatures
[单项选择]Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A. facilitate bi-directional operation
B. provide the greatest pump efficiency
C. prevent pump clogging from marine growth
D. prevent cavitation at the pump outlet
[单项选择]Flexible hose under pressure in a hydraulic system will （）.
A. tend to twist about its long axis
B. expand in length and in diameter
C. contract in length and expand in diameter
D. flex at right angles to the applied pressure
[单项选择]Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
A. install shoring so the shoring supports the damaged bulkheads without pushing on them
B. install shoring so that it pushes on the damaged bulkhead while supporting it
C. use jacks or chain falls to remove the set before installing shores
D. place sandbags by the bulkhead without installing shores
[判断题]Social changes can often bring about language changes.
[单项选择]Goldfish and hamsters all die.（）.
A. So do us
B. So we do
C. So are we
D. So do we
[单项选择]Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
A. The expansion tank should be topped off
B. The thermostatic water regulating valves should be manually opened
C. The fuel filters should be changed
D. The engine should be turned over slowly with the indicator cocks open
[单项选择]A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.
A. Tehuan tepecer
B. Papagayo
C. Norther
D. Pampero
[单项选择]A fuse that blows often should be replaced only with a fuse of （）.
A. the recommended current and voltage rating
B. higher current and voltage rating
C. higher current and lower voltage rating
D. lower current and higher voltage rating
[单项选择]Mooring winches are often combined with （） units so that one prime mover drives both.
A. crane
B. hatch cover
C. windlass
D. steering gear
