FCTC Written Study Guide Questions & Answers Solved 100%

Classes of Levers - Answer Class 1, Class 2, Class 3 Class 1 Levers - Answer Fulcrum is in the middle, with the effort (input) force on one side of the fulcrum and resistance (output) on the other side .Mechanical Advantage greater or less than 1 Ex: Seesaw, Crowbar, Pair of Scissors. Class 2 Levers - Answer Resistance is in the middle, the effort is applied on one side of the resistance and the fulcrum on the other side .Mechanical Advantage is always greater than 1 Ex: Wheelbarrow, nutcracker, bottle opener, or the brake pedal of a car. Class 3 Levers - Answer Effort in the middle, the resistance is on one side of the effort and the fulcrum is located on the other side. Mechanical Advantage is always less than 1 Ex: Pair of tweezers, human mandible Lever Definitions - Answer Lever machine consisting of a beam or rigid rod pivoted at a fixed hinged, or fulcrum. Input Force = Effort Output Force = Load or Resistance What does "fre, 123" mean? - Answer Fulcrum is in the middle for Class 1 LeversResistance (output) in middle for Class 2Effort (input) in the middle for Class 3 Formula for Determining the head pressure difference between an intake and output - Answer 1 vertical foot = 0.433 psi 1 psi = 2.31 vertical feet Overall Test Overview: - Answer 1) 30-minute period to read 2 essays- 2-hour time limit begins to answer (100 questions). 2) Watch 2 short videos and answer (20 questions) based on the scenarios. 3) Apply mechanical reasoning (25 questions, i.e. Fluid Dynamics, levers, belt and pulleys, gears) 4) Mathematical Problems (20 questions, i.e. addition, division, angles, area, volume, decimals, ratios, percentages) 5) Recall and Comprehend Technical Information (35 questions, recall from first two essays, in addition to one or two more at this time) Be mindful of questions with absolutes. What are some absolutes and why watch out for them? - Answer Examples of absolutes are "absolutely, always, forever, completely, infinite, never, only, sole, undeniable, or wholly".Absolutes or any sort of broad statements should be suspected as wrong. Recall and Comprehend Technical Information - Answer - Read one to four essays -35 questions total (including questions for essays in back of the test booklet) - notes can be written on the essay packet, NOT any other testing material. - 15 - 20 questions from these essays were handed out in the first 30 minutes. Gear Train, or commonly called "Transmission" - Answer Two or more gears working in a sequence, producing mechanical advantage through a gear ratio. Relationship between Speed, Torque, and Power: - Answer Power = 2pi x Speed (w) x Torque (nm)/ 60 Torque = 60 x Power (kW)/2pi x Speed (Rpm) Belt and Pulley Systems - Answer Two or more pulleys in common to a belt. If the pulleys are of differing pitch diameters, a mechanical advantage is realized. Doesn't depend on ratio of teeth as with gears and sprockets, only pitch diameter. What is a pulley (also called a "sheave" or "drum") - Answer A pulley is a wheel on an axle or shaft that is designed to support movement and change in direction of a belt or cable along its circumference. For a Rope and Pulley System that is a Block and Tackle, is characterized by: - Answer * If the rope does not dissipate or store energy, then its mechanical advantage is the number of parts of the rope that act on the load.- if the anchor knot is at the load ("A", "D", and "E") then the mechanical advantage will be odd. (1:1, 3:1, 5:1, etc.)- if the anchor knot is at the anchor ("B", "C") then the mechanical advantage will be even. (2:1, 4:1, 6:1, etc.)- to calculate haul distance, multiply the distance need to go by the mechanical advantage. (3:1 ratio, 20 ft to haul, multiply 3 x 20 ft to get a total of 60ft) How much water can be held in engine 17 water tank - Answer 105 feet Sq How many gallons with a tank of 12 ft diameter hold if it is 5 feet deep - Answer 4320 Engine carries lots of hose. 4" was removed - Answer 30% left How many acres were burned - Answer 6.88 acres How many cubic feet of water can a captain expect the tank to hold - Answer 1385 What is the total percentage of the body burned - Answer 22..5 What is the minimum length of ladder to reach the roof of a 3 story house - Answer 40ft Total chain that crew cuts - Answer 6 chains each