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Explain any two of the following: Worm and wheel drive, Electrical fuse, Morse taper sleeve, Plastic dip coating. - Leaving Cert Engineering - Question 1 - 2010
Question 1
Explain any two of the following: Worm and wheel drive, Electrical fuse, Morse taper sleeve, Plastic dip coating.
Worked Solution & Example Answer:Explain any two of the following: Worm and wheel drive, Electrical fuse, Morse taper sleeve, Plastic dip coating. - Leaving Cert Engineering - Question 1 - 2010
Step 1
Worm and wheel drive
Answer
A worm and wheel drive is a mechanical system composed of two interlocking gears: a worm (which resembles a screw) and a wheel. The worm is fixed to a shaft that rotates and engages with the wheel, transferring motion. The unique setup allows for a high gear reduction; for instance, a single rotation of the worm can result in a 90-degree turn of the wheel. This design provides significant advantages such as increased torque and the ability to drive the wheel at a high speed while preventing reverse motion. Therefore, it is highly valued in applications where space is limited and a compact solution is needed.
Step 2
Electrical fuse
Answer
An electrical fuse is a safety device designed to protect electrical circuits from overloads. It consists of a metal wire encased in a ceramic or glass tube. When normal operating conditions exist, the electrical current flows through the fuse. However, if the current exceeds a predetermined level due to a fault, the wire heats up and melts, breaking the circuit. This 'blowing' action interrupts the flow of electricity, preventing damage to devices and reducing fire hazards. Fuses are essential components in electrical systems, ensuring safety by automatically disconnecting power in harmful situations.