Practice questions and answers for single girder crane operation exam

1. When the crane is not working, the time allowed for heavy objects to hang in the air is. (D)

A, 1 minute B, 3 minutes C, 5 minutes D, not allowed

2. How long the crane wire rope needs to be greased according to the standard. (A)

A, 1 month B, 3 months C, half a month D, on demand

3. The following are not part of the single-girder crane structure. (C)

A. Drum operation structure B, trolley operation structure C, electrical system D, transmission structure

4. In the lifting and installation, the basis for selecting the lifting point of the equipment is the equipment. (B)

A. Weight; B. Center of gravity; C. Material; D. Dimensions

5. Fires caused by the following combustibles cannot be extinguished with co2 fire extinguishers. (A)

A, solid combustibles B, gas combustibles C, liquid combustibles D, electrical combustibles

6. The fire extinguishers equipped for cable line fire are mainly. (B)

A, foam fire extinguisher B, CO2 fire extinguisher C, dry powder fire extinguisher D, others

7. The wire rope whose surface wear reaches the diameter (B) should be scrapped.

A, 5% B, 15% C, 25% D, 40%

8. When lifting, the heavy object shall not exceed the surface where the object is placed. (A)

A, 50cm B, 80cm C, 100cm D, 120cm

9. When lifting objects, what should someone do next? (D)

A. It doesn’t matter. B. People don’t have to avoid when the lift is light.

C. At work, focus on work. D. In any case, no one should be below

2. Fill in the blank questions: (9×2=18 points)

1. During the lifting process, the operating position of the personnel is on the ___side___ of the crane hoisting object, and the height shall not be higher than 2M.

2. When lifting, the lifting height standard is about 50___cm above the surface where the object is placed.

3. The lifting of wooden boxes shall not exceed __2__ boxes.

4. Before hoisting, first during the hoisting process __ check the records of the brakes, hooks, wire ropes and safety devices according to the requirements of the crane inspection table. If abnormal phenomena are found, they should be eliminated, and the operator must first confirm and go Turn on the main power only when there is no one on the platform or track. When a warning sign is hung on the power switch, the main power can be turned on only after the original relevant personnel have removed it.

5. Fire alarm call __119____, emergency call _____120_____.

6. The lifting limit of the company's single beam crane is ___3, 5____ tons.

3. True or False: (5×1=5 points)

1. During normal lifting, multiple people are not allowed to command, but when any person initiates an emergency stop signal, the emergency stop should be stopped immediately. ()

2. Reversing can be used instead of braking, limit can be used instead of parking, and emergency switch can be used instead of ordinary switch. ()

3. The operator must be able to operate after receiving the command signal, and the bell should be sounded when the vehicle starts. ()

4. Crooked pull and diagonal hanger belong to the normal operating range. ()

5. Crane operation must have a certificate to work, except for those who are skilled in operation without a certificate. ()

4. Short answer questions: (2×15=30 points)

1. Briefly describe the daily inspection contents of single beam cranes. (Write at least ten items, more points will be added)

wheel

1. Whether there is abnormal sound The rolling bearing does not produce noise, the bearing is lubricated well, and there is no heat

2. Whether the screws are loose and the spring pads are compressed

Gearbox

1. Check the source of the sound (gears, bearings) with a screwdriver for abnormal sound

2. Whether the lubrication is good, there is no intermittent hoarse sound, and the reducer does not heat up

3. Whether the screw is loosened or not The screw is not loosened

結合

1. There is no abnormal sound, no serious wear of the teeth, no movement of the transmission shaft, no abnormal sound

2. Whether the screw is loosened or not The screw is not loosened

ブレーキ

1. Whether there is oil leakage in the hydraulic pusher, and whether the lifting action is smoothly lifted into place, and the lift is smooth

2. Whether the screws are loose or not. The screws are well forbidden and the brake wheel is not bounced or loose.

3. Whether the brake wheel bounces, the brake frame has no swing, and the brake wheel has no axial movement

4. Whether the adjustment is suitable for flexible opening and closing, stable and reliable braking, and no slippage

フック

1. Observe carefully the appearance of the hook screw for cracks

2. Whether the hook is fixed firmly, the shaft end baffle is not loose, and the nut fastening pin is not broken

buffer

1. Visual inspection of the bearing for cracks

2. Is the cushioning performance good? The spring has good elasticity and no breaks.

Hanging beam

1. Whether the beam has cracked welding and the bending and twisting beam has no cracked welding deformation (check carefully)

2. Regular replacement of rings for cracks (check carefully)

3. Whether the card board is loose, the screws are not loose, and the card board has not fallen off

Pulley block

1. Whether the rim is defective or cracked

2. Whether the outer cover is damaged, deformed, or welded

3. Whether the pulley shaft is fixed tightly and the round nut is tightly tightened

Wire rope (spreader)

1. Whether there are broken wires, broken strands, knots, the number of broken wires shall not exceed 12 within the length of 75mm; no broken strands

2. Whether the wire rope pressure plate is loose and the compression screw is not loose

3. Check carefully whether the lubrication is good

reel

1. Check carefully if the connecting screws are loose

2. Whether there is any abnormal phenomenon in the bearing seat, no abnormal sound, no heat, no vibration

Stopper

1. Whether the shape of the stopper is intact and the shape is intact without damage

2. Check whether the stopper is effective

2. Silently write the content of "Ten Do Not Hang".

① The command signal is unknown or the command is not suspended;

②Do not hoist when the lifting capacity exceeds the rated capacity;

③Unreasonable use of slings or inadequate hanging of objects;

④There are people or other floating objects on the hanging objects.

⑤If the brake or other braking safety device fails, do not hang;

⑥ Do not hang heavy objects when they are directly processed by crane;

⑦Hanging slantingly without hanging;

⑧ Do not hang explosive objects;

⑨ Objects buried in the ground shall not be pulled out;

⑩ Objects with edges and corners are not hung if they are not properly cushioned;

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