ASVAB practice test 1 An induction clutch works by - Correct Answer magnetism If a first class lever with a resistance arm measuring 2 feet and an effort arm measuring
- feet are being used, what's the mechanical advantage? - Correct Answer Length of
- Correct Answer recoil
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
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? - Correct Answer r = DR/d, r=16.6666 Springs used in machines are usually made of - Correct Answer steel A clutch is a type of - Correct Answer coupling A single block-and-fall is called a - Correct Answer runner The mechanical advantage of the block-and-tackle arrangement shown below is - Correct Answer 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? - Correct Answer 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? - Correct Answer 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? - Correct Answer Silver is the best conductor, so it becomes hottest If an alternator overcharges the battery, a likely explanation is - Correct Answer The voltage regulator isn't working properly A primary advantage of the electronic ignition system over conventional ignition systems is - Correct Answer The electronic ignition system provides a higher voltage The primary purpose of piston rings is to - Correct Answer seal the combustion chamber and allow the pistons to move freely Connecting rods connect the piston to the - Correct Answer crankshaft 1 / 2
In an overhead valve system (OHV), what mechanism opens and closes the valves? - Correct Answer rocker arms The difference between a single-acting and an opposed piston engine is - Correct Answer Single-acting piston engines have one piston per cylinder and opposed piston engines have two A car equipped with limited-slip differential - Correct Answer transfers the most driving force to the wheel with the greatest amount of traction Soft brake-pedal movement can be caused by - Correct Answer air in the hydraulic brake system The safest way to make a hole in sheet metal is to - Correct Answer punch it using a metal punch Nail sets are used to - Correct Answer set nails below the surface of the wood A ripsaw cuts - Correct Answer with the grain of the wood A bucking bar is used to - Correct Answer drive rivets Washers that have teeth all around the circumference to prevent them from slipping are called - Correct Answer shakeproof washers Ohm's law states - Correct Answer Voltage = Current × Resistance. V=IR An electromagnetic-induction device usually has which of the following materials in its core - Correct Answer iron How many diodes should you expect to find in a bridge rectifier? - Correct Answer A bridge rectifier is also known as a full wave rectifier, usually containing 4 diodes
Another name for cycles per second is: - Correct Answer hertz
When current flows through a wire, the following influences are present - Correct Answer voltage, ohms, amperes Millihenries are related to - Correct Answer inductors Radar can operate at frequencies as high as - Correct Answer 100,000 MHz Radio waves travel - Correct Answer at the speed of light Changing alternating current to direct current is called - Correct Answer AC to DC is a process called rectification
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