Engines 1 Midterm 2023

Front

Who is correct about torque? Technician A: Movement does not have to occur to have torque. Technician B: Torque is a twisting force.

Back

Both

Front

Knowing that pressure ____ when the volume of a sealed container is _____ will help you to understand the need for sealing the chamber for maximum power.

Back

Rises; reduced

Front

The rate in time and distance at which a force is produced is known as:

Back

horsepower.

Front

Who is correct about compression ignition engines? Technician A: Compression pressures have to be lower. Technician B: Heat of compression ignites the fuel.

Back

Technician B

Front

Typically, if well maintained, an automotive engine will last many years and ______ miles (322,000 kilometers [km]) or more.

Back

200,000

Front

The rapidly expanding gases produced by combustion pressurize the combustion chamber and push down on the piston during the ________, forcing it through the cylinder until it reaches the bottom of its travel.

Back

Power stroke

Front

The ________ is the difference between the volume in the combustion chamber above the piston when the piston is at bottom dead center (BDC) and the volume of the combustion chamber above the piston when the piston is at top dead center (TDC).

Back

Compression ratio

Front

This color exhaust emitting from a vehicle’s engine indicates an excessively rich fuel mixture:

Back

Black

Front

The intake stroke starts with the exhaust valve closed, the intake valve(s) opening, and the piston moving from TDC to BDC.

Back

True

Front

The engine’s so-called top end is the crankcase where the crankshaft, bearings, and connecting rod “big ends” reside.

Back

False