432 Q7 Performance

To improve the intake of air in sports engines, they are typically designed with 2 intake valves per cylinder.

• True.
• False.

Which of these statements is true?

• Supercharging improves the volumetric efficiency.
• Supercharging reduces the volumetric efficiency.
• The volumetric efficiency is not affected by supercharging.

The indicated power can be measured directly.

• True.
• False.

The "in-cylinder" power is the

• indicated power
• brake power
• friction power
• none of these options

Friction power is primarily a function of

• engine speed
• air-fuel ratio
• compression ratio
• fuel type

An ICE drives an electricity generator that needs 120 kW to operate. This "120" means the

• engine indicated power
• engine brake power
• engine friction power
• heat released during combustion inside the engine

Which efficiency is constant over the normal rpm range?

• volumetric efficiency
• mechanical efficiency
• brake efficiency
• indicated efficiency

The brake efficiency is

• the actual efficiency of your engine
• a measure of the engine ability to pack its cylinders with air
• an ideal efficiency of a frictionless engine
• a measure of how fast the car stops when you hit the brake pedal