Ch 67
Choose the correct statement with respect to a fuel cell. It produces higher emissions than biodiesel-powered vehicles. It combines hydrogen and oxygen to produce water and in the process it produces electricity and heat. A fuel cell produces a voltage of about 1000 volts. Fuel cells are heavy and increase vehicle load.
It combines hydrogen and oxygen to produce water and in the process it produces electricity and heat.
Alternative fuels advance all of the following
energy security. environmental concerns economy
Bio-alcohol is used primarily:
as a blend with gasoline.
Vapor lock is caused by fuel that does not vaporize easily in hot weather.
false
Technician A says the DPFE [differential pressure feedback EGR] sensor determines the amount of gas flowing through the EGR valve by measuring the pressure drop across an orifice. Technician B says some EGR valves have an NTC thermistor that measures exhaust gas temperature at the outlet of the EGR valve. Who is correct?
both
Technician A says the biggest disadvantage of using CNG as a fuel is that the large amount space occupied by fuel cylinders limits the driving range of the vehicle. Technician B says bi-fuel vehicles are equipped to store both CNG and gasoline and will run on either.Who is correct?
both
When compared to petrodiesel, biodiesel: has a lower ocetane rating. has a lower cloud point and pour point. produces significantly fewer emissions. produces more harmful emissions.
produces significantly fewer emissions
What happened to most of the early battery electric vehicles (BEVs) from the 1990s?
recalled and crushed
Which of the following hybrid drive configurations is where the ICE only drives a generator to charge the batteries, which then power the electric motor to drive the wheels?
series hybrid
Hybrid vehicles are being discussed. Technician A says in a series hybrid the engine is there only to extend the vehicle's driving range. Technician B says in a parallel hybrid the electric motor and batteries are the main power source during normal driving conditions. Who is correct?
tech a
Tech A says that E85 vehicles are designed to use 85% ethanol efficiently. Tech B says that hydrogen cars are not zero-emission vehicles. Who is correct?
tech a
Tech A says that some hybrid battery packs are cooled by a cooling system. Tech B says that regenerative braking in a hybrid vehicle uses electricity from the high-voltage battery to slow the vehicle. Who is correct?
tech a
Technician A says CO emissions increase as the air/fuel ratio becomes richer. Technician B says CO emissions increase as the air/fuel ratio becomes leaner. Who is correct?
tech a
Technician A says if the EVAP system is purging vapors from the charcoal canister while the engine is idling, rough engine operation will occur. Technician B says the system should not have more than 0.5 liter of flow during the 240 seconds of an I/M 240 test. Who is correct?
tech a
Tech A says that biodiesel mixed with diesel fuel does not reduce emissions. Tech B says that a 1% or more blend of biodiesel extends the life of injectors. Who is correct?
tech b
Technician A says a lean mixture burns faster than a rich mixture. Technician B says advanced ignition timing induces knock. Who is correct?
tech b
Biomass fuels are those derived from nonfossil sources and produced from plant or animal products or wastes.
true
Compressed natural gas (CNG) is one of the cleanest alternative fuel.
true
Most diesel fuel currently available at the pump has a octane rating of ______.
40-55
If a flex fuel vehicle has half a tank of E85 onboard and the driver then fills the tank up with regular gasoline what will happen?
The system will automatically adjust and run normally
An I/M 240 test lasts _____ minutes.
4 mins
Choose the correct statement. CNG is compressed and stored at low pressures. The volume of space required for LNG storage tanks is almost twice that required for CNG tanks for delivering the equivalent mileage range. Because CNG is a gas, not a liquid, it does not matter whether the container is standing up or lying down. CNG cylinders come in two types (heavy and light).
Because CNG is a gas, not a liquid, it does not matter whether the container is standing up or lying down.
All the following statements concerning E85 automotive fuel are true EXCEPT: E85 produces less CO2 E85 produces less emissions than gasoline E85 keeps the fuel system cleaner E85 is more fuel efficient
E85 is more fuel efficient
All of the following statements are true with respect to servicing hybrid and electric vehicles except: Pierce a high-voltage wire when testing for voltage. Avoid working on the high-voltage areas of a hybrid vehicle without first having the proper training. Disconnect the main high-voltage battery pack before service is performed on or around the high-voltage components. Never assume that the vehicle is turned off because it is silent or still.
Pierce a high-voltage wire when testing for voltage.
All the following statements are correct EXCEPT: During a Reid vapor test, fuel is heated to 100 degrees Fahrenheit (38 degrees Celsius) Vapor pressure is measured in psi The more volatile a fuel is, the easier it will vaporize Tetraethyl lead is added to gasoline to decrease the vapor pressure
Tetraethyl lead is added to gasoline to decrease the vapor pressure
Choose the correct statement.
because CNG is a gas not a liquid it does not matter whether the container is standing up or lying down
Crankcase pressure forcing crankcase gases through the clean air hose and into the air cleaner is being discussed. Technician A says the cause may be an excessive amount of blowby. Technician B says the cause may be a restricted PCV valve. Who is correct?
both
Tech A says that CNG fuel tanks hold 3600 psi (24,800 kPa). Tech B says that CNG engines tend to emit white smoke, which is water vapor. Who is correct?
both
Tech A says that a CAT III meter is required when working on the EV or HEV high-voltage system. Tech B says that a HEV can start the ICE on its own if the "Ready" indicator is on. Who is correct?
both
Tech A says that high-voltage wires in hybrid and electric vehicles are usually a special color. Tech B says that special high-voltage gloves should be worn when working on high-voltage vehicles. Who is correct?
both
Tech A says that lithium-ion batteries currently have the highest energy density of batteries used in HEVs. Tech B says that nickel-metal hydride batteries are less expensive than lithium-ion batteries. Who is correct?
both
Technician A says a motor converts electrical energy into mechanical energy. Technician B says an engine converts chemical energy into mechanical energy. Who is correct?
both
Technician A says cylinder misfiring causes a significant increase in HC emissions. Technician B says a dirty air filter may cause high CO emissions. Who is correct?
both
Technician A says that the main high-voltage battery pack must be disconnected before service is performed on or around the high-voltage components. Technician B says that most vehicles use a service plug or battery module switch to disconnect the high-voltage battery. Who is correct?
both
Using gasoline with high levels of sulfur can cause ______.
damage to engine bearings exhaust valve pitting rotten egg smell from the exhaust
manufactured gas
derived from other forms of fuel such as wood or coal
Alternative fuels advance all of the following except: energy security. environmental concerns. economy. elegance.
elegance.
The volatility of gasoline affects all the following performance characteristics or driving conditions EXCEPT: cold starting and warm up vapor lock performance at higher altitudes fuel line freeze up
fuel line freeze up
Excessively high CO emissions may be caused by a ______.
higher than normal fuel pressure
What chemical is added seasonally to gasoline as an anti-icing agent to prevent fuel line freeze-up in cold weather? benzene xylene isopropyl alcohol MTBE [methyl tertiary butyl ether]
isopropyl alcohol
Which of the following is a rechargeable battery with the highest energy density currently in use?
lithium ion
Tech A says that fuel cells only emit CO2 to the atmosphere. Tech B says that fuel cells run on water. Who is correct?
neither
Tech A says that prior to working on a hybrid vehicle, make sure the "Ready" indicator is on. Tech B says that once the service plug is removed, you can immediately start working on the high-voltage system. Who is correct?
neither
Which of the following is NOT a major factor affecting fuel performance? antiknock quality sulfur content volatility nitrogen content
nitrogen content
