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 boomB.Extend arm with thumb pointing downward and flex fingers in and outC.With forearm vertical and forefinger pointing up，move hand in small horizontal circlesD.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
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 thumb pointing downward and flex fingers in and out
C.With forearm vertical and forefinger pointing up，move hand in small horizontal circles
D.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
相关考题：
On 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
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 boomB.raise the hookC.raise the boom and hookD.check the boom stop
How should you signal the crane operator to hoist ________．A.With forearm vertical and forefinger pointing up，move hand in small horizontal circlesB.With arm extended downwards and forefinger pointing down，move hand in small horizontal circlesC.Extend arm with fingers closed and thumb pointing upwardD.Place both fists in front of body with the thumbs pointing upward
How should you signal the crane operator to move slowly ________．A.Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signaB.Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desiredC.First tap your elbow with one hand and then proceed to use regular signalsD.First tap the top of your head with your fist and then proceed to use regular signals
The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the ______．A.Maximum counter weight requiredB.Minimum horsepower requiredC.Hoist rope strengthD.Allowable load
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
When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．A.winch speedB.boom strengthC.load radiusD.cable strength
How should you signal the crane operator to lower the boom?______.A.With arm extended and fingers closed, point thumb downwardB.With arm extended downwards and forefinger pointing down, move hand in small horizontal circlesC.Extend arm with the palm down, and hold this position rigidlyD.With hands clasped in front of your body
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 outB.Place both fists in front of the body with the thumbs pointing upwardC.With forearm vertical and forefinger pointing up，move hand in small horizontal circlesD.Extend arm with fingers closed and point thumb upward
How should you signal the crane operator to stop?______.A.Place both fists in front of your body with thumbs pointing pointing outwardB.With both arms extended out and palms down, move arms back and forthC.Extend arm with the palm down and hold this position rigidlyD.Clasp hands in front of your body
单选题How should you signal the crane operator to raise the boom?（）.AExtend arm with the thumb pointing up and flex the fingers in and outBPlace both fists in front of the body with the thumbs pointing upwardCWith forearm vertical and forefinger pointing up,move hand in small horizond circlesDExtend arm with the fingers closed and thumb upward
单选题The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.Araise the boomBraise the hookCraise the boom and hookDcheck the boom stop
单选题On a ship’s crane，the load chart relates the allowable load to the combination of the boom length and（）.Awinch speedBboom strengthCload radiusDcable strength
单选题How should you signal the crane operator to move slowly（）.AUse one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signaBExtend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desiredCFirst tap your elbow with one hand and then proceed to use regular signalsDFirst tap the top of your head with your fist and then proceed to use regular signals
单选题How should you signal the crane operator to swing?（）.AWith both arms extended out and palms to down, move arms back and forthBWith arm ertended downwards and forefinger pointing down,move hand in small horizontal creclesCExtend arm and point finger in the direction to move boomDPlace both fists in front of the body with the thumbs pointing outward
单选题How should you signal the crane operator to lower the boom and raise the load（）.AExtend arm and point finger in the direction to move the boomBExtend arm with thumb pointing downward and flex fingers in and outCWith forearm vertical and forefinger pointing up，move hand in small horizontal circlesDWith arm extended downwards and forefinger pointing down，move hand in small horizontal circles
单选题How should you signal the crane operator to stop in an emergency?（）AExtend arm with the palm down and hold this position rigidlyBPlace clasped hands in front of your bodyCExtend arm and move hand rapidly right and left with the palm downDPlace both fists in front of the body with the thumbs pointing outward
单选题How should you signal the crane operator to stop?（）.APlace both fists in front of the body with the thumbs pointing outwardBWith both arms extended out and palms to down, move arms back and forthCExtend arm with the palm down and and hold this position rigidlyDClasp hands in front of you body
单选题How should you signal the crane operator to dog everthing?（）.APlace both fists in front of the body with the thumbs pointing outward each otherBClasp hands in front of your bodyCExtend arm with the palm down and and hold this position rigidlyDExtend arm with the thumb pointing up, and flex the finger s in and out
单选题The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.Amaximum counter weight requiredBminimum horsepower requiredChoist rope strengthDallowable load
单选题How should you signal the crane operator to raise the boom and lower the load?（）.AExtend arm with the palm down and and hold this position rigidlyBPlace both fists in front of the body with the thumbs pointing outward each otherCClasp hands in front of you bodyDExtend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired
单选题The boom indicator tells the operator at what angle the boom is compared to the（）.Ahorizontal position of the boomBvertical position of the boomChorizontal position of the load being liftedDvertical position of the load being lifted
单选题The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the（）.Amaximum counter weight requiredBminimum horsepower requiredChoist rope strengthDallowable load
单选题In a general cargo crane, （） is fitted to raise or lower the jib.Athe slewing motorBthe luffing motorCthe hoisting motorDnone of the above
单选题What does “evel-luffing” accomplish during crane operations（）.AIt prevents the load from swinging when the boom level is adjustedBLess power is needed when topping the boom with a load on the hookCIt maintains the height of the load above the deckDAll of the above
单选题0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.Avertical positionBhorizontal positionCboom stop angleDminimum radius angle
单选题On a ship crane，the load chart relates the allowable load to the combination of boom length and（）.Aboom angleBboom strengthCload radiusDcable strength