A) Gear oil
B) Water
C) Gasoline
D) Wine

A) Increased friction and wear on gears leading to potential damage
B) Quieter operation
C) Increased speed
D) Improved efficiency

A) Gear shaft
B) Oil pump
C) Cooling fan
D) Bearing

A) Blowing air
B) Using sand
C) Splash lubrication
D) Applying heat

A) Motor oil
B) Synthetic lubricants
C) Vegetable oil
D) Diesel fuel

A) Increased wear, overheating, and potential damage to the gearbox
B) Improved performance
C) Faster speed
D) Quieter operation

A) To make the gearbox more colorful
B) To increase the flow rate
C) To release a pleasant aroma
D) To allow for expansion and contraction of the lubricant due to temperature changes

A) To make the lubricant smell better
B) To change the color of the lubricant
C) To make the lubricant less effective
D) To enhance the lubricant's performance and protect the gearbox under various conditions

A) Force feed lubrication
B) Drip feed lubrication
C) Mist lubrication
D) Splash lubrication