Mechanism: Gears Quiz

What are the advantages of bevel gears?

• Bevel gears provide smooth and efficient power transmission between intersecting shafts, and they can change the direction of rotation.

• Bevel gears are only suitable for straight shafts

• Bevel gears cannot change the direction of rotation

• Bevel gears are noisy and inefficient

Explain how gear ratio is calculated for a pair of gears with different numbers of teeth.

• Driven gear teeth + Driving gear teeth

• Driven gear teeth - Driving gear teeth

• Driven gear teeth * Driving gear teeth

• Driven gear teeth / Driving gear teeth

A gear with 20 teeth is meshed with a gear with 40 teeth. Which of the following is true?

• 40 teeth gear rotates faster

• 20 teeth gear rotates faster

• Both gears rotates at a same speed

• It depends on which gear is the driver gear

In what application is spur gears commonly used?

• oscillating fan

• automatic gate

• weighing machine

• hole puncher

Differentiate between bevel gears and spur gears.

• Bevel gears have teeth cut along the cylindrical surface while spur gears have teeth cut along the cone-shaped surface.

• Bevel gears have teeth cut along the cone-shaped surface while spur gears have teeth cut along the cylindrical surface.

• Bevel gears have teeth cut along the cone-shaped surface while spur gears have no teeth.

• Bevel gears have no teeth while spur gears have teeth cut along the cylindrical surface.

How is gear ratio calculated when the driver gear has 30 teeth and the driven gear has 10 teeth?

• 3

• 20

• 5

• 15

Explain the difference in the tooth arrangement between bevel gears and spur gears.

• The tooth arrangement in bevel gears is along the cylindrical surface, while in spur gears it is along the conical surface.

• Bevel gears have straight teeth, while spur gears have helical teeth.

• Spur gears have teeth that are cut at an angle, while bevel gears have teeth that are cut straight.

• The tooth arrangement in bevel gears is along the conical surface, while in spur gears it is along the cylindrical surface.

Why are spur gears often used in washing machines and hand drills?

• Low efficiency and smooth operation

• High efficiency and rough operation

• Low efficiency and noisy operation

• High efficiency and smooth operation

What is the main difference in the way bevel gears and spur gears transmit motion?

• Spur gears transmit motion between non-parallel shafts at an angle, while bevel gears transmit motion between parallel shafts.

• Bevel gears transmit motion between non-parallel shafts at an angle, while spur gears transmit motion between parallel shafts.

• Bevel gears and spur gears both transmit motion between parallel shafts.

• Bevel gears transmit motion between parallel shafts, while spur gears transmit motion between non-parallel shafts at an angle.

A 10 teeth gear is meshed to a 20 teeth gear. Which of the following is true?

• The 10 teeth gear rotates with smaller torque.

• The 10 teeth gear rotates with larger torque.

• The 10 teeth gear rotates with same torque as the 20 teeth gear

• It depends on which is the driver.