Two technicians are discussing helical gears. Technician A says the teeth on a helical gear are straight-cut. Technician B says the contact of the gear tooth starts at the tip and rolls down the tooth.

Task 1: Read the text and fill in the blanks with NO MỎRE THAN THREE WORDSSpur gear is the simplest type of gear with teeth projecting towards or away from the centre. The edge of each tooth is straight and aligned parallel to the axis of rotation. Spur gears are used in low-speed applications and in situations where noise control is not a problem. It tends to be noisy at high speed.Helical gears are similar to spur gears except that their teeth are cut in a spiral shape. The angled teeth engage more gradually than spur gear teeth do, helping them run more smoothly and quietly. Helical gears are used in high-speed applications, large power transmission, or where noise control is important.Some helical gears have just one continuous tooth. These are called worms. A worm pairs with a worm gear, which helps reduce speed.A rack and pinion is a type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack), which operate to convert rotational motion into linear motion. In other cases, a machine transmits power at an angle. This requires bevel gears. Bevel gears have a conical form and can be used to transmit rotational power through shafts that are typically at an angle of 90 degrees to each other.Spur gears have teeth projecting towards or away from the centre. They are used in applications and cannot control noise at high speed.Helical gears have their teeth cut in a spiral shape. They are used in high-speed applications, large power and can control noise.Worm and worm gears have just one continuous tooth with a worm gear. They help reduce speed.A consists of a circular gear engaging a linear gear. It can be used to convert rotational motion into linear motion.Bevel gears which have a conical form are used for transmitting rotational power through shafts at an angle of

Technician A says that when the external teeth of two gears are in mesh they rotate in the same direction. Technician B says that when two gears, one with internal teeth and other with external teeth, are in mesh, they rotate in the same direction. Which technician is correct?

Two technicians are discussing automatic transmissions. Technician A says planetary gear sets must always mesh. Technician B says planetary gear sets should have gear lash. Which technician is correct?

Technician A says that there are three types of rear axle ring and pinion gearsets: spiral bevel, hypoid, and amboid. Technician B says gears can be named for their tooth cut type. Which technician is correct?

Complete each sentence with ONE suitable word/ phrase beginning with the given letter.The driving gear in the gearset is called a p_ _ _ _ _. Teeth of spur gears may p_ _ _ _ _ _ towards or away from the center. Some helical gears have just one continuous tooth called w_ _ _ _. They pairs with worm gears.