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Question 8 - Leaving Cert Engineering - Question 8 - 2008
Question 8
Question 8. (a) Name and outline a suitable application for one of the mechanisms shown. (i) (ii) (b) Explain the function of any three of the following: (i) El... show full transcript
Worked Solution & Example Answer:Question 8 - Leaving Cert Engineering - Question 8 - 2008
Step 1
Name and outline a suitable application for one of the mechanisms shown.
Answer
One suitable application for the Bevel gear system is in drill machines. Bevel gears allow the transfer of rotational motion between shafts that are at right angles, effectively changing the direction of the drive. This is crucial in applications like hand drills, where the motor's axis needs to direct power to the drill bit.
Step 2
Explain the function of any three of the following: (i) Electrical relay;
Answer
An Electrical relay is a switch that opens and closes circuits electromechanically or electronically. When a small current passes through the coil, it creates a magnetic field that pulls the switch contacts together, allowing a larger current to be controlled by a smaller one. This is commonly used to control lights and motors.
Step 3
Explain the function of any three of the following: (ii) Clutch;
Answer
The Clutch is a mechanical device used in transmission systems to engage or disengage the engine from the drivetrain. When the clutch is engaged, the pressure plate and friction plate come together, allowing power to be transmitted from the engine to the wheels smoothly.
Step 4
Explain the function of any three of the following: (iii) Shuttle valve;
Answer
A Shuttle valve is a type of control valve that allows a single-acting pneumatic cylinder to receive signal inputs from two different sources. It switches the flow, directing it to one port, while cutting off the other. This function is critical in control applications where the output needs to change direction.
Step 5
Describe, with the aid of appropriate diagrams, a mechanised system that will safely elevate heavy loads.
Answer
To elevate heavy loads safely, a rack and pinion mechanism is used. This system consists of a gear (the pinion) that engages with a linear rack. When the motor turns the pinion, it moves the rack vertically, thus lifting the load. The system must maintain balance by ensuring the center of gravity is aligned properly. Diagrams should illustrate the motor circuit connected to the rack and pinion, showing how the motor drives the system upwards while maintaining stability.