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8. (a) Name and describe the operation of any one of the mechanisms shown - Leaving Cert Engineering - Question 8 - 2012
Question 8
8. (a) Name and describe the operation of any one of the mechanisms shown. (i) (ii) (b) Explain any three of the following: (i) The energy conversion that ... show full transcript
Worked Solution & Example Answer:8. (a) Name and describe the operation of any one of the mechanisms shown - Leaving Cert Engineering - Question 8 - 2012
Step 1
Name and describe the operation of any one of the mechanisms shown.
Answer
One mechanism that can be described is the ball bearing. A ball bearing is designed to allow a shaft to rotate smoothly within a housing. It does so by minimizing friction between the rotating shaft and the surrounding structure. The bearing contains small balls that roll between two races, where one is typically stationary while the other rotates. This design significantly reduces friction and wear, allowing for a smoother operation and extending the life of both the shaft and the machinery.
Step 2
Explain any three of the following: The energy conversion that occurs in a car battery;
Answer
In a car battery, energy conversion occurs during the process of chemical energy transforming into electrical energy. When the battery is charged, chemical reactions take place within the lead-acid cells, which generate electrical energy. This energy is then used to power the starter motor and ignition system, enabling the engine to start and run.
Step 3
Explain any three of the following: The function of an idler gear;
Answer
An idler gear is used to change the direction of rotation in a gear system without affecting the gear ratio. It is positioned between two gears and allows both input and output shafts to rotate in the same direction. The idler gear does not have a direct influence over the gearing ratio but maintains smooth operation and proper alignment in mechanical systems.
Step 4
Explain any three of the following: One application of a ratchet and pawl mechanism;
Answer
The ratchet and pawl mechanism is commonly applied in tools such as a socket wrench. In this application, the ratchet allows a user to apply torque in one direction while preventing reverse movement. The pawl engages with the teeth of the ratchet wheel, allowing it to rotate in one direction but locking it in place when attempting to rotate in the opposite direction. This mechanism is vital for tasks requiring incremental adjustments.
Step 5
Describe, with the aid of suitable diagrams, one method of providing independent drive to each wheel of the all-terrain surveillance vehicle shown.
Answer
To provide independent drive to each wheel of the all-terrain surveillance vehicle, the most effective method is to equip each wheel with its own motor. This setup allows each wheel to be controlled separately, enabling the vehicle to traverse rough terrains more effectively. Each motor can be operated independently according to the terrain and traction needs, allowing for enhanced maneuverability. Below is a diagram illustrating this configuration:
[Motor 1] [Motor 2]
| |
[Wheel 1] [Wheel 2]
[Motor 3] [Motor 4]
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[Wheel 3] [Wheel 4]
This configuration allows for efficient energy use and precise control over the vehicle's movement, especially in uneven landscapes.