5-Practice Test (50 questions)

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When a hydraulic mechanism is used in a stacker, what is necessary to control the hydraulic mechanism?

• safety valve
• switching valve
• lift valve
• tilt valve

Which of the following accidents can be avoided if employers make sure that no one is under lifting objects?

• Electrification
• Falling
• Falling objects
• Oxygen deficiency

When using an electric stacker, below what percentage of the battery capacity fall should you immediately stop working and charge the battery?

• 0.2
• 0.3
• 0.35
• 0.4

When is the time for the safety inspection of the stacker?

• after the disaster
• before the operation starts
• after the operation is over
• during maintenance

What should every stacker have?

• maintenance application form
• application form for repair
• daily inspection record sheet
• inspection certificate.

In order to save time, workers clean up the table without power cut. What is the potential hazard?

• Electrification induced by pinch
• Oxygen deficiency
• Falling
• Collapse

The stacker must turn right in reverse mode. In which direction should the steering wheel rotate?

• clockwise
• counterclockwise
• do not move
• it must be determined by the steering position of the rear wheels

The hydraulic oil of the stacker is insufficient. What is the correct way to deal with it? 

• continue the operation
• ignore it
• immediately notify maintenance personnel
• add hydraulic oil by yourself