Exam 3: Basic Theories and Math

What is a mechanical advantage?

The fixed pivot point that a lever rotates on is called the ____________________.

A force acting over a large area will exert less pressure per square inch than the same force acting over a smaller area.

What is tensile strength?

Friction can be reduced only by lubrication.

A galvanized part is made of iron or steel that has been coated with _____.

Motion is being discussed. Technician A says the inertia of an object at rest is called static inertia. Technician B says dynamic inertia refers to an object in motion. Who is correct?

Iron combines with hydrogen to form rust.

How much horsepower is generated by an engine running at 5800 rpm while producing 265 lbs./ft. of torque.

What is the thermal efficiency of a vehicle that produces 34,000 BTU of work for each 100,000 BTU of fuel it uses?

Heat measurement is being discussed. Technician A says a BTU is the amount of heat it takes to raise the temperature of one gram of water one degree Fahrenheit. Technician B say a calorie is the amount of heat it takes to raise one pound of water one degree Celsius. Who is correct?

The volume of an engine's cylinders determines its size, which is expressed as ____________________.

All materials have a unique resonant or natural vibration frequency.

The _____ of an engine expresses how much the air and fuel mixture will be compressed as the cylinder moves from BDC to TDC.

All the following are properties of metals EXCEPT:

Technician A says kinetic energy in the crankshaft is converted into electrical energy by the generator. Technician B says electrical energy in the generator is converted into chemical energy in the battery. Who is correct?

Technician A says materials that absorb fluids are impermeable substances. Technician B says that materials that adsorb fluids are permeable substances

Forces are being discussed. Technician A says centrifugal force tends to pull things toward the center of a circle. Technician B says centripetal force tends to push things away from the center of a circle. Who is correct?

If the tooth on the driving gear is pushing against the tooth of a driven gear with a force of 15 pounds and the radius of the driving gear is 1 foot, how much force will be applied to the driven gear?

When fuel burns in the engine cylinders, ____________________ energy is converted to ____________________ energy.