Exam 40: Hybrid and Hydrogen Fuel Cell Drivetrains

Technician A says that PHH, SHH, and all forms of electric drive commercial vehicle are best suited to long distance linehaul operations. Technician B says that PHH and SHH technologies were pioneered by Eaton Corporation and the U.S. Army. Who is correct?

Which of the following powertrains does not use an internal combustion engine (ICE)?

When a diesel-electric hybrid drivetrain uses regenerative braking, retarding energy, which of the following is true? (braking force) is sourced from:

When a hydrogen fuel cell cogenerates waste heat, what happens to its overall thermal efficiency?

When is the ICE most likely to be required to mechanically power a HEV drivetrain?

Which of the following is true of regenerative braking in an HEV commercial vehicle?

When the hydrogen required by a fuel cell is 'reformed' from a gasoline source, what is the undesirable byproduct?

For a fuel cell to convert energy to electricity it should be provided with:

In a series or parallel hybrid hydraulic drivetrain in regenerative braking mode, what energy is produced and stored?

When in regenerative braking mode, what does a diesel electric hybrid drivetrain produce?

Which of the following is true of an HEV powertrain used in a typical urban vehicle?

In an HEV equipped with a blended torque transmission (BTT), what is usually providing torque to the wheels at vehicle launch?

When a blended torque transmission is used in an HEV drivetrain transit bus, which of the following features are possible?

Where are the hydrogen cylinders usually located on a fuel cell powered transit bus?

Technician A says that a blended torque transmission (BTT) provides for continuously variable output ratios. Technician B says that for a planetary gearset such as those used in BTTs to produce an output, one of the three planetary members must be held stationary. Who is correct?

Technician A says that all electrically-driven transit buses use fuel cell technology. Technician B says that current fuel cells can produce thermal efficiencies of up to 60%. Who is correct?

If a fuel cell is to be truly emissions-free, which of the following should be true regarding the source of the hydrogen?

Technician A says that HEV buses can use NG-fueled engines. Technician B says that HEV buses can use diesel engines. Who is correct?

Technician A says that diesel electric hybrid drive technology has been used in railway locomotives for several generations. Technician B says that advantages of both hydraulic and electric hybrid drive systems stem from using small bore diesel engines in much larger vehicles than a small bore engine would normally power. Who is correct?

What results from the electrochemical reaction in a hydrogen fuel cell?