Chapter 39
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Chapter 39
1. What is the fuel required by a fuel cell?
b. Hydrogen and oxygen
2. What results from the electrochemical reaction in a fuel cell?
d. Electricity and water
3. Which type of fuel cell is currently being used in trials in city buses?
a. Proton membrane exchange
4. When a regenerative braking cycle is engaged in an HEV (diesel electric) hybrid drive system, which of the following should be true?
d. The DC motor magnetic field is reversed.
5. Technician A states that an advantage of a parallel hydraulic hybrid (PHH) drive system is that a small diesel engine 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?
a. Technician A only
6. Which type of batteries tends to be used in the most recent generation of HEV transit buses?
d. Lithium-ion (Li-on)
7. When a blended torque transmission is used on an HEV transit bus, which of the following features are possible?
d. All of the above
8. Which of the following is true of a motor/ generator used in an HEV transit bus?
d. All of the above.
9. What type of hydraulic accumulator is used in an Eaton PHH and an SHH drive system?
b. Nitrogen gas loaded at 5,000 psi (345 bar)
10. Technician A says that UCs will sustain up to a million charge and discharge cycles.
Technician B says that UCs can hold large amounts of electrical energy but discharge it more slowly than most types of batteries. Who is correct?
a. Technician A only
11. Which of the following cities has entirely eliminated diesel engines from its transit bus fleet?
d. Los Angeles
12. Technician A says that HEV buses can use NG-fueled engines. Technician B says that blended torque transmissions are used in most HEV city buses. Who is correct?
c. Both A and B
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