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8. (a) Name any one of the mechanisms shown and describe a suitable application: (i) (ii) (b) Explain the function of any three of the following: (i) Idler gears; (ii) Universal joint; (iii) Solenoid; (iv) Pneumatic flow regulator; (v) Solar panel - Leaving Cert Engineering - Question 8 - 2007
Question 8
8. (a) Name any one of the mechanisms shown and describe a suitable application: (i) (ii) (b) Explain the function of any three of the following: (i) Idler g... show full transcript
Worked Solution & Example Answer:8. (a) Name any one of the mechanisms shown and describe a suitable application: (i) (ii) (b) Explain the function of any three of the following: (i) Idler gears; (ii) Universal joint; (iii) Solenoid; (iv) Pneumatic flow regulator; (v) Solar panel - Leaving Cert Engineering - Question 8 - 2007
Step 1
Name any one of the mechanisms shown and describe a suitable application:
Answer
The mechanism chosen is the Rack and Pinion.
Description: The rack and pinion system converts rotary motion into linear motion. The pinion is a gear that meshes with a flat bar (the rack) to enable movement along a straight line.
Application: This mechanism is widely used in steering systems of cars where the rotational movement of the steering wheel is converted into the linear movement required to turn the vehicle's wheels.
Step 2
Explain the function of any three of the following:
Answer
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Idler gears: Idler gears are used to connect two other gears in a system, helping to maintain the same direction of rotation without affecting the gear ratio. They allow the input gear and output gear to rotate in the same direction while not influencing the speed or torque being transmitted.
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Universal joint: A universal joint allows one shaft to drive another shaft when their axes are not aligned. It accommodates the angle between the shafts, making it essential for connecting drive shafts in vehicles.
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Solenoid: A solenoid is a coil of wire that creates a magnetic field when an electric current passes through it. This magnetic force moves a bar into its center, enabling the solenoid to act as a switch or actuator.
Step 3
Describe, with the aid of a diagram, a mechanism that could be used to automatically open a door.
Answer
A practical solution for automatically opening a door is the rack and pinion mechanism.
Description: This mechanism consists of a motor driving a pinion that meshes with a rack. When the motor is activated, the pinion rotates and moves the rack linearly, pulling the door open.
Diagram:
[ Pinion ]
/|
/ |
---/ |--- [ Rack ]
| |
o |
Motor
Functionality: A light-dependent resistor is employed to detect when a person approaches the doorway. When the light decreases, it triggers a relay that activates the motor, moving the pinion and subsequently the door.