Mechanical Comprehension – Test 3 0% 60 Time Expired This subtest has 16 questions and a time limit of 20 minutes 1 / 16 Pressure that is less than normal air pressure is called a: leak vacuum puncture depression Pressure that is less than normal air pressure is called a vacuum. Pressure that is less than normal air pressure is called a vacuum. 2 / 16 A metric system of units means that values can be calculated by factors of: infinity 10 mass one A metric system of units means that values can be calculated by factors of 10. A metric system of units means that values can be calculated by factors of 10. 3 / 16 When two gears of unequal size (meaning an unequal number of teeth) are meshed together, the smaller of the two is usually called a: shaft rack pinion flywheel When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. 4 / 16 An inclined plane permits you to overcome a large: inertia fulcrum friction resistance An inclined plane permits you to overcome a large resistance. An inclined plane permits you to overcome a large resistance. 5 / 16 When two external gears mesh, they always turn in what directions? opposite same upward lower When two external gears mesh, they always turn in the opposite directions. When two external gears mesh, they always turn in the opposite directions. 6 / 16 Pressure is the amount of force within a specific: area container tube fluid Pressure is the amount of force within a specific area. Pressure is the amount of force within a specific area. 7 / 16 In all machines, the actual mechanical advantage equals the resistance divided by the: load friction effort mass In all machines, the actual mechanical advantage equals the resistance divided by the effort. In all machines, the actual mechanical advantage equals the resistance divided by the effort. 8 / 16 What is the benefit of using ball bearings or roller bearings in a machine? sliding friction is less than rolling friction metal is smoother than oil rolling friction is less than sliding friction greater mass equals more friction The benefit of using ball bearings or roller bearings in a machine is that rolling friction is always less than sliding friction. The benefit of using ball bearings or roller bearings in a machine is that rolling friction is always less than sliding friction. 9 / 16 The Law of Conservation of Momentum states: momentum of an open system remains the same Momentum requires opposing forces total mass of a system remains the same total momentum of a closed system cannot change The Law of Conservation of Momentum states that the total momentum of a closed system cannot change. The Law of Conservation of Momentum states that the total momentum of a closed system cannot change. 10 / 16 Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as: torque rotational work axle rotation mass work Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as rotational work. Work done on a rigid body due to the sum of the torques integrated over the angle through with the body rotates is known as rotational work. 11 / 16 What law does the force developed in a spring obey? Hamilton's law Law of Least Resistance Newton's 16th law of motion Hooke's law The force developed in a spring obeys Hooke's Law. The force developed in a spring obeys Hooke's Law. 12 / 16 Equilibrium is achieved when the forces on a system are: inverse net net hyperactive balanced Equilibrium is achieved when the forces on a system are balanced. Equilibrium is achieved when the forces on a system are balanced. 13 / 16 When two gears of unequal size are meshed together, the smaller of the two is usually called a: rack flywheel shaft pinion When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. When two gears of unequal size are meshed together, the smaller of the two is usually called a pinion. 14 / 16 In what type of system does mass remain constant and the net external force on the system is zero? elastic system closed sytem frozen system balanced system In a closed system, mass remains constant and the net external force on the system is zero. In a closed system, mass remains constant and the net external force on the system is zero. 15 / 16 Third-class levers increase speed at the expense of: friction speed mass force Third-class levers increase speed at the expense of force. Third-class levers increase speed at the expense of force. 16 / 16 What can used to change rotary motion into linear motion? worm drive miter bevel cams Cams can used to change rotary motion into linear motion. Cams can used to change rotary motion into linear motion. Your score is 0% Exit