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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 use of bevel gears; (ii) Double-acting cylinder; (iii) Clutch; (iv) The function of an idler gear; (v) Capacitor; (c) Describe, with the aid of suitable diagrams, a mechanism to control the vertical movement of the dental chair shown. - Leaving Cert Engineering - Question 8 - 2010
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 use of bevel gears; (ii) Dou... show full transcript
Worked Solution & Example Answer: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 use of bevel gears; (ii) Double-acting cylinder; (iii) Clutch; (iv) The function of an idler gear; (v) Capacitor; (c) Describe, with the aid of suitable diagrams, a mechanism to control the vertical movement of the dental chair shown. - Leaving Cert Engineering - Question 8 - 2010
Step 1
Step 2
Explain any three of the following: (i) The use of bevel gears
Answer
Bevel gears are used in mechanical systems to allow for the transfer of motion at right angles. They typically have conically shaped teeth that mesh together, enabling a change in direction of the rotational force applied.
Step 3
Explain any three of the following: (ii) Double-acting cylinder
Answer
A double-acting cylinder is designed to utilize both sides of its piston. Compressed air is used to move the piston in either direction, allowing the cylinder to extend and retract. This bidirectional action makes it suitable for various applications where controlled force is necessary.
Step 4
Explain any three of the following: (iii) Clutch
Answer
A clutch is a critical component in a transmission system, used to connect and disconnect the drive between the engine and the wheels. When engaged, it allows for the transfer of power, while disengaging it breaks the connection, enabling the vehicle to change gears smoothly.
Step 5
Describe, with the aid of suitable diagrams, a mechanism to control the vertical movement of the dental chair shown.
Answer
The mechanism for controlling the vertical movement of a dental chair often utilizes a hydraulic ram. This system operates via a control panel that adjusts the pressure within the hydraulic ram, allowing the chair to be raised or lowered smoothly.
- Hydraulic Ram: It is positioned under the chair, fixed to the base.
- Control Panel: This is used to control the upward and downward movements by adjusting the fluid pressure in the ram.
- Positioning: The mechanism allows the chair height to be adjusted either directly or by attaching a separate pedal, making it accessible for the dentist to manage the chair's position.