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单选题
What is meant by the term TOPPING THE BOOM?（）
A
Lowering the boom
B
Raising the boom
C
Spotting the boom over the deck
D
Swinging the boom athwartships
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单选题Stress on the topping lift of a swinging boom can be reduced by（）.A
rigging a back stayB
raising the boomC
increasing the mechanical advantage of the cargo purchaseD
taking all slack out of the preventer
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单选题What is meant by the term“luffing the boom”of a crane（）．A
Stopping the boomB
Topping or lowering the boomC
Moving the boom left or rightD
All of the above
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单选题A band or collar on the top end of a boom which the topping lift, midships guy, and outboard guys are secured, is called the（）.A
collar bandB
guy bandC
pad eye collarD
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单选题What is meant by the term “broaching to”? （）A
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Running before a seaC
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Cover the fire with foamC
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单选题A tackle by which the outer end of a boom is raised and lowered is the topping（）.A
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单选题The tackle that raises and lowers the boom is（）.A
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单选题The boom indicator tells the operator at what angle the boom is compared to the（）.A
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单选题Sudden starts or stops of the boom is likely to cause all of the following except（）.A
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carrying away a blockD
overheating the resistors and eventually burning out
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单选题With a given load on the cargo hook，tension in a single span topping lift（）.A
increases as the boom's angle to the horizontal increasesB
is at a maximum when the boom is at a 45° angle to the horizontalC
increases as the boom's angle to the horizontal decreasesD
decreases as the boom's angle to the horizontal decreases
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multiple layers of firewallingB
a method of operating firewalls from multiple vendorsC
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an architecture in which all traffic between firewalls goes through application-specific serversE
an architecture in which all traffic between firewalls goes through application-specific gateways
考题
单选题What is meant by spotting the boom?（）A
Lowering it into a cradleB
Placing it in a desired positionC
Spotting it with wash primer and red leadD
Two-blocking it
考题
单选题What does “evel-luffing” accomplish during crane operations（）.A
It prevents the load from swinging when the boom level is adjustedB
Less power is needed when topping the boom with a load on the hookC
It maintains the height of the load above the deckD
All of the above
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单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.A
vertical positionB
horizontal positionC
boom stop angleD
minimum radius angle
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