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Questions and Answers

What is the method to check a chain for elongation?

Apply a load, measure chain and use 5% max formula to check extension.

Measure the chain length without any load and compare with standards.

Apply a load, measure chain and use 2% max formula to check extension. (correct)

Hang the chain under its own weight, measure chain and use 2% max formula to check extension.

How should a chain be properly stored?

Stored in a dry environment without any lubrication.

Hanged in a vertical position to prevent tangling.

Lay uncoiled and flat in greaseproof paper.

Oiled and coiled in greaseproof paper. (correct)

Epicyclic gears are primarily used on shafts that are oriented in which manner?

Shafts that are not aligned in any way.

Shafts rotating on offset axis.

Shafts rotating on an axis that is 45 degrees from each other.

Shafts rotating on the same axis. (correct)

What is the primary purpose of a guard where a control chain goes around a sprocket?

Stops the chain from coming off if it goes slack. Signup and view all the answers

Worm drives operate between shafts that are oriented in which direction?

90 degrees to each other and in differing planes. Signup and view all the answers

Which of the following correctly identifies the pattern of a gear?

The path they take when the gear is rotating. Signup and view all the answers

What should not be done when checking a chain for elongation?

Use a formula that exceeds the 2% max threshold. Signup and view all the answers

When laying out a stored chain, what is the recommended storage practice?

Oiled and coiled in greaseproof paper. Signup and view all the answers

What is the appropriate action when a segment of a long chain is found defective?

Replace the whole chain. Signup and view all the answers

What is the typical process for hardening the teeth of a gear?

Case hardening using flame cooling and water spray quenching. Signup and view all the answers

What characteristic defines non-reversible chains?

They can only be moved in one direction. Signup and view all the answers

Which term describes the large diameter on a bevel gear?

Heel. Signup and view all the answers

What method is used to check a chain for elongation?

Lay flat on a table, apply tensile load and measure. Signup and view all the answers

What is the primary alignment of drive planes on an epicyclic gear?

Around a common axis of the plane. Signup and view all the answers

Compared to spur gears, what advantage do spiral gears have?

Reduced stress concentration on gears. Signup and view all the answers

Which type of clutch can overrun the driving member?

Freewheel clutches. Signup and view all the answers

What components make up a gear system, or gear train?

Driven, driver, and idler gears. Signup and view all the answers

What does a gear mesh test involve?

Painting the surface of a gear and running it. Signup and view all the answers

How can the direction of a control chain be changed in two planes?

By using bi-planer blocks. Signup and view all the answers

What characterizes a non-reversible chain?

Every second outer plate is extended in one direction. Signup and view all the answers

Where should a pair of gears sit when not under load?

In the middle. Signup and view all the answers

Which two factors are critical for the proper operation of gears?

Lash and pattern. Signup and view all the answers

What are the teeth on the smaller wheel of a bevel gear called?

Toe. Signup and view all the answers

Where should gear mesh test marks ideally appear on the tooth?

Middle. Signup and view all the answers

What type of gear is typically used in a propeller reduction gearbox?

Epicyclic gears. Signup and view all the answers

Where can the inspection interval for chains typically be found?

Maintenance schedule. Signup and view all the answers

What does a feather key allow for in gear operation?

Axial movement and positive drive. Signup and view all the answers

What does a worm drive create in terms of direction?

A drive in two planes but transmitting in one direction only. Signup and view all the answers

Which process is used to check for stiff links in a chain?

Running the chain over a finger by 180 degrees. Signup and view all the answers

What is typically done to the teeth of a gear for durability?

Case hardening. Signup and view all the answers

On bevel gear teeth, the wear pattern is expected to be?

At the center of the tooth. Signup and view all the answers

Study Notes

Chain Maintenance

Check chain elongation by applying a load and measuring with a 2% maximum formula.
Store chains oiled and coiled in greaseproof paper to prevent wear.
Stiff links in a chain can be checked by running the chain over a finger by 180 degrees.

Gear Systems

Epicyclic gears function on shafts that rotate on the same axis; commonly found in turboprop reduction gearboxes.
Bevel gears have a specific wear pattern; it should be greatest at the center.
The large diameter on a bevel gear is referred to as the heel, while the small diameter is called the toe.
For proper gear operation, elements like lash and pattern must be correctly maintained.

Gear Testing and Inspection

The meshing pattern observable on gear teeth during tests should ideally be in the middle of the tooth.
The teeth of gears usually undergo case hardening to enhance durability and reduce brittleness.
If a defective segment of a chain is found during inspection, the entire chain must be replaced rather than repaired.

Worm Drives and Non-Reversible Chains

Worm drives allow for motion in two planes but transmit in one direction only.
Non-reversible chains are uniquely designed so that every second outer plate extends in one direction, ensuring they can only be fitted in one direction.

Clutch Mechanisms

Freewheel clutches allow overrunning of the driving member, useful in various mechanical applications.

General Knowledge

A gear system consists of driven, driver, and idler gears, working together for effective transmission.
The pattern of gear teeth plays a crucial role in determining the efficiency and reliability of the gear system.

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Description

Test your knowledge on how to check for chain elongation in this quiz. The questions focus on the methods and formulas used to measure chain extension effectively. Perfect for automotive or mechanical engineering students.