Exam 40: Hybrid and Hydrogen Fuel Cell Drivetrains

When electricity is used to directly power traction motors, what is the highest rate of thermal efficiency in current vehicles?

In a hydrogen fuel cell commercial vehicle, where is the DC electricity stored?

Technician A says that a series hybrid electric vehicle (SEV) technology is used in some transit buses. Technician B says that rang-extended electric vehicles (REEV) are designed to primarily use electric drive. most commercial hybrid hydraulic vehicles use a diesel engine as the primary power source. Technician B says that most commercial hybrid electric vehicles use a diesel engine as the primary power source. Who is correct?

During which of the following operating modes is the electrical section of a blended torque transmission (BTT) most likely to generate electricity?

What principle do the Hydrogenics Ballard type fuel cells use?

Technician A states that an advantage of a parallel hydraulic hybrid (PHH) drive system is that a small bore ICE can be used in place of a larger one. Technician B states that a PHH system can only impart hydraulic drive torque, so that in the event of a leak, the vehicle would be crippled. Who is correct?

Which of the following electro-chemical reactions could be considered to 'reverse' fuel cell principle?

In current hybrid electric vehicle (HEV) buses, what type of batteries tend to be used?

If the ICE failed in an PHEV vehicle with a BTT, which of the following would be true?

Which of the following accounts for the significantly lower emissions produced by the small bore ICE used in an HEV?

What effect does cryo-compression have on the hydrogen that is used to power fuel cells?

When a fuel cell is functioning, it produces:

Technician A says that in a parallel hybrid hydraulic (PHH) drivetrain, drive torque is provided exclusively by a hydraulic motor. Technician B says that in a series hybrid hydraulic (SHH) drivetrain, drive torque is provided exclusively by a hydraulic motor. Who is correct?

Technician A says that a series hydraulic hybrid (SHH) drive options either direct mechanical or full hydraulic motor drive. Technician B says that the Eaton HLA is a parallel hydraulic hybrid (PHH) system. Who is correct?

Technician A says that a key to making hybrid technology work is the blended torque transmission. Technician B says that a blended torque transmission can provide output using all-mechanical source torque, all-electric source torque, or any combination of either. Who is correct?

If a drive technology is described as parallel hybrid (PH) what is the minimum number of drive sources required?

Which type of fuel cell is currently favored by commercial vehicles?

What type of hydraulic accumulator is used in Eaton PHH and SHH drive systems?

Which of the following is required for a hydrogen fuel cell to produce electricity?

What is the consequence of reforming natural gas (NG) to produce hydrogen?