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Question 8 - Leaving Cert Engineering - Question 8 - 2009
Question 8
Question 8. (a) Name any one of the mechanisms shown and describe a suitable application. (i) (ii) (b) Explain any three of the following: (i) The advantages of... show full transcript
Worked Solution & Example Answer:Question 8 - Leaving Cert Engineering - Question 8 - 2009
Step 1
Name any one of the mechanisms shown and describe a suitable application.
Answer
One mechanism shown is the ratchet and pawl.
Application
This mechanism is used in devices such as socket wrenches. The ratchet allows the socket to turn and lock in either direction due to the design of the locking pawl. This enables continuous operation in one direction while preventing backward movement.
Step 2
The advantages of helical gears;
Answer
Helical gears offer several advantages:
- Smooth Operation: They have a slanted tooth design which allows for multiple teeth to engage simultaneously, resulting in smoother and quieter operation compared to straight gears.
- Stronger Gear Setup: The diagonal teeth can handle larger loads due to their gradual engagement.
- Better Alignment: The helix angle helps with load distribution, reducing stress on individual teeth.
Step 3
One method of preventing slip in a pulley-belt system;
Answer
A common method to prevent slip in a pulley-belt system is to use a jockey wheel.
Description
A jockey wheel helps maintain the tension of the belt, ensuring that it remains tight around the pulleys. By applying proper tension, the likelihood of the belt slipping is significantly reduced, improving overall efficiency.
Step 4
Crank and slider mechanism;
Answer
The crank and slider mechanism is a device used to convert rotational motion into linear motion.
Example
An air compressor uses this mechanism, where a motor drives a crankshaft. As the crank rotates, it moves a piston inside a cylinder, compressing air as it moves up and down, which is then stored or used for various applications.
Step 5
Integrated circuit;
Answer
An integrated circuit (IC) is a compact assembly of electronic components, including transistors, resistors, and capacitors, all mounted on a single piece of semiconductor material.
Features
- Size and Efficiency: ICs allow for miniaturization of electronic devices while increasing reliability.
- Common Usage: Used in a variety of applications from simple electronic toys to complex computing systems, showing their versatility and essential role in modern technology.
Step 6
Describe, with the aid of suitable diagrams, a mechanism to activate a rotating jewellery display as shown.
Answer
The jewellery display can be automated using a worm and gear mechanism.
Description
- Components: The system consists of a worm, a gearwheel, and a motor. The worm is connected to the motor and drives the gear, which in turn rotates the display platform.
- Operation: The motor activates the mechanism, causing the worm to turn, which rotates the gearwheel. This action enables the jewellery display to rotate smoothly.
This setup is advantageous as it provides precise control over the rotation speed, ensuring an even display of the jewellery.