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Explain any two of the following: Variable resistor, Rack and pinion, Compressive force, Hand vice. - Leaving Cert Engineering - Question 1 - 2013
Question 1
Explain any two of the following: Variable resistor, Rack and pinion, Compressive force, Hand vice.
Worked Solution & Example Answer:Explain any two of the following: Variable resistor, Rack and pinion, Compressive force, Hand vice. - Leaving Cert Engineering - Question 1 - 2013
Step 1
Variable resistor
Answer
A variable resistor is a type of resistor that allows for the adjustment of resistance between its terminals. This adjustment is typically achieved by turning a spindle, which can change the resistance value from zero up to a maximum specified by the design of the component. Variable resistors are frequently used in applications where voltage and current need precise control. For example, a Light Dependent Resistor (LDR) or a Thermistor can also function as a variable resistor by varying their resistance based on light intensity or temperature, respectively.
Step 2
Rack and pinion
Answer
The rack and pinion mechanism is utilized to convert rotary motion into linear motion. The assembly consists of a flat, toothed rack and a pinion gear, which is typically round and rotates to engage with the rack. When the pinion gear is rotated, it moves the rack either horizontally or vertically, depending on the orientation of the setup. This mechanism is prevalent in various applications including drills, where the drill's motion is guided in a straight line by the interaction of the pinion rotating and moving the rack.