更多"The design specifications for crane"的相关试题:
[单项选择]Annual inspection of vessel cranes shall be conducted by（）.
A. HAS
B. the person in charge
C. a qualified inspector
D. the crane operator
[单项选择]Pedestal cranes have limit switches to restrict movement of which function（s）（）.
A. Hoist upper & lower limits
B. Luff travel limits
C. Rider block hoist upper & lower limits
D. All of the above
[单项选择]Hydraulic cranes must be properly warmed-up before being operated because （）.
A. warm-up allows the hydraulic system to become charged with oil
B. warm-up allows the relief valves to be properly tested
C. hydraulic strainers operate only during the warm-up period
D. hydraulic fluid must be at the proper viscosity
[单项选择]Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[单项选择]For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.
A. principle
B. medium
C. instruction
D. voltage
[单项选择]Some cranes are mounted in pairs on a common platform which can be rotated through（）.
A. 360°
B. 270°
C. 180°
D. 90°
[单项选择]Deck cranes require（） time to prepare for working cargo than derricks.
A. less
B. more
C. many
D. much
[单项选择]Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
A. reduce engine horsepower output
B. aid in silencing the exhaust noise
C. increase the mean effective pressure
D. contribute to effective cylinder scavenging
[单项选择]In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A. improper venting of the cooling system
B. carrying the expansion tank water level too high
C. a totally clogged impeller in the cooling water pump
D. an incorrectly set cooling system temperature control
[单项选择]What is/are the advantage（s）of cranes over conventional cargo booms（）.
A. Cranes are able to pick up and drop loads over a greater spotting area
B. Increased safety because the deck is clear of running and standing rigging
C. Simplicity of operation of the crane by its operator
D. All of the above
[单项选择]25型车集便器的FOU是指（）。
A. 冲洗电磁阀
B. 冲水电磁阀
C. 冲洗控制单元
D. 水增压器
[单项选择]Which statement comparing a shipboard crane to conventional gear is TRUE（）.
A. Cranes are more difficult to secure for sea
B. The spotting area of the conventional gear is larger
C. A crane operator requires more training than the winch operator of a yard and stay rig
D. The yard and stay rig is more flexible in its ability to handle a wider variety of cargoes
[单项选择]The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
A. raise the boom
B. raise the hook
C. raise the boom and hook
D. check the boom stop
[单项选择]How should you signal the crane operator to lower the boom and raise the load?（）.
A. Extend arm and point finger in the direction to move the boom
B. Extend arm with the thumb pointing downward and flex fingers in and out
C. With f rearm vertical and forefinger pointing up,move hand in small horizond circles
D. With arm extended downwards and forefinger pointing down,move hand in small horizontal circles
[单项选择]How should you signal the crane operator to raise the boom?（）.
A. Extend arm with the thumb pointing up and flex the fingers in and out
B. Place both fists in front of the body with the thumbs pointing upward
C. With forearm vertical and forefinger pointing up,move hand in small horizond circles
D. Extend arm with the fingers closed and thumb upward
[单项选择]The crane manufacturer’s operating tables are posted near the（）.
A. crane pedestal
B. wire-rope locker
C. main deck
D. crane controls
[单项选择]In a general cargo crane, three principal movements are （）； （）； （）.
A. hoisting；luffing；slewing
B. lifting；raising；lowering
C. rotating；raising；handling
D. hosting；lowering；moving
[单项选择]The boom stops are installed on an offshore crane to（）.
A. prevent the boom from being raised too high
B. prevent the boom from swinging
C. support the boom when not in use
D. prevent the boom from being lowered
