ASVAB Practice Test 1

ASVAB Practice Test 1 An induction clutch works by - ☑magnetism If a first class lever with a resistance arm measuring 2 feet and an effort arm measuring 8 feet are being used, what's the mechanical advantage? - ☑Length of Effort Arm ÷ Length of Resistance Arm. MA = 8 ÷ 2 = 4 The force produced when a boxer's hand hits a heavy bag and "bounces" off it is called - ☑recoil If Gear 1 has 25 teeth and Gear 2 has 15 teeth, how many revolutions does Gear 2 make for every 10 revolutions Gear 1 makes? - ☑r = DR/d, r=16.6666 Springs used in machines are usually made of - ☑steel A clutch is a type of - ☑coupling A single block-and-fall is called a - ☑runner The mechanical advantage of the block-and-tackle arrangement shown below is - ☑2. Because this block-and-tackle arrangement merely changes the direction of the pull, it has a mechanical advantage of only 2. If a house key, a wooden spoon, a plastic hanger, and a wool jacket are all the same temperature, which one feels the coldest? - ☑The key will feel coldest because metal is a better conductor than the other materials A way to determine the amount of power being used is? - ☑The formula for determining power is Power = Work ÷ Time. A wood tool, a silver tool, and a steel tool are placed in boiling water for cleaning. Which tool gets the hottest? - ☑Silver is the best conductor, so it becomes hottest If an alternator overcharges the battery, a likely explanation is - ☑The voltage regulator isn't working properly A primary advantage of the electronic ignition system over conventional ignition systems is - ☑The electronic ignition system provides a higher voltage The primary purpose of piston rings is to - ☑seal the combustion chamber and allow the pistons to move freely Connecting rods connect the piston to the - ☑crankshaft In an overhead valve system (OHV), what mechanism opens and closes the valves? - ☑rocker arms The difference between a single-acting and an opposed piston engine is - ☑Single-acting piston engines have one piston per cylinder and opposed piston engines have two A car equipped with limited-slip differential - ☑transfers the most driving force to the wheel with the greatest amount of traction Soft brake-pedal movement can be caused by - ☑air in the hydraulic brake system The safest way to make a hole in sheet metal is to - ☑punch it using a metal punch Nail sets are used to - ☑set nails below the surface of the wood A ripsaw cuts - ☑with the grain of the wood A bucking bar is used to - ☑drive rivets