Automotive Technician Exam Questions PDF

1. Hydrogen is stored in all of the following EXCEPT: Water Lead Organic Matter Natural Gas Technician A states that Grade #1 diesel fuel is best suitable for winter use. Technician B states that Grade #2 is best suitable for winter. Who is correct? Tech A...

1. Hydrogen is stored in all of the following EXCEPT: Water Lead Organic Matter Natural Gas Technician A states that Grade #1 diesel fuel is best suitable for winter use. Technician B states that Grade #2 is best suitable for winter. Who is correct? Tech A Tech B Both Techs Neither Techs Compressed Natural Gas labels are diamond shaped and generally what color? Yellow Red Blue Black 1. Technician A states that CNG costs much higher than gasoline. Technician B states that CNG is compressed under high pressure. Who is correct? Tech A Tech B Both Techs Neither Techs Tech A states that FCHV stands for Fuel Cell Hybrid Vehicle. Tech B states that FCHV stands for Federal Class High Voltage. Who is correct? Tech A Tech B Both Techs Neither Techs Tech A states that propane burns clean. Tech B states that propane can be used in indoor equipment like forklifts. Who is correct Biodiesel fuel can be manufactured from all of the following EXCEPT: Iron ore Restaurant greases Vegetable oils Animal fats Tech A states that diesel engines produce less torque than gasoline engines. Tech B states that diesel engines are built heavier, offering longer service life. Who is correct? Tech A Tech B Both Techs Neither Techs 1. Air in a diesel engine is controlled by the throttle cable. True False  1. Tech A states that diesel fuel is ignited by a spark plug on compression stroke. Tech B states compression ratios of diesel engines are typically 16:1 or higher. Who is correct? Tech A Tech B Both Techs Neither Techs 1. Humidity in a fuel cell is controlled by a fuel cell ______________________________. Ignitor Evaporator Drain valve Humidifier 1. CNG fuel tanks are filled to around ____________________ psi. 15 3600 200 500 Question 16 1. Distributor injection pump systems use one common rail to distribute fuel. True False 1. Hydrogen filling station pumps use pressure and temperature ratings. True False An HEUI diesel injection system uses all of the following EXCEPT:  High pressure oil pump Fuel injectors High pressure fuel injection pump Fuel filter 1. Tech A states that Ford HEUI diesel systems use high pressure oil and engine controller to control injectors. Tech B states that diesel fuel injection pumps use fuel for lubrication. Who is correct? Tech A Tech B Both Techs Neither Techs 1. Since 2007, all production light duty diesels must use ___________________________ fuel. petroleum Ultra low sulfur High sulfer Grade #1 Question 21 1. Diesel fuel is rated by cetane number. True False Natural CNG has all of these properties EXCEPT: Odorless non-flammable  Tasteless Colorless 1. Tech A states that CNG is delivered at the intake manifold at a very high pressure. Tech B states that CNG is delivered at the intake manifold at a very low pressure. Who is correct? Tech A Tech B Both Techs Neither Techs 1. When filling a CNG vehicle, the slow fill method will give the tank its fullest charge. True False Tech A states that liquid petroleum is also know as LPG. Tech B states that it is also know as LP. Who is correct? Tech A Tech B Both Techs Neither Techs 1. Ethyl mercaptan (skunk) is added to CNG and LP to give it a _________________. Higher octane Color Taste Smell Question 27  1. The label identifying propane is usually diamond shaped and colored ______________. Red Black Green Yellow 1. Tech A states that Bi-fuel vehicles use only propane as a fuel. Tech B states a dedicated propane vehicle uses both propane and gasoline as a fuel. Who is correct? Tech A Tech B Both Techs Neither Techs 1. B20 Bio-diesel fuel can generally be used in most diesel vehicles. True False 1. Pure bio-diesel fuel is represented by B1. True False 1. An advantage of diesel fuel over gasoline is that diesel fuel is cheaper. True False Tech A states that the fuel supply system on a diesel only relies on fuel pressure and not volume. Tech B states that both are needed for proper operation. Who is correct? Tech A Tech B  Both Techs Neither Techs 1. The supply fuel pump on a diesel engine is also referred to as a lift pump. True False The water in fuel light is on. Tech A states you need to remove and clean the fuel tank. Tech B states you need to drain the water separator housing. Who is correct? 1. Clean oil on a HEUI system is not real important, just clean fuel. True False 1. A fuel cell is an electromechanical device in which the chemical energy of hydrogen and ________________ is converted into electrical energy. Nitrogen Protons Oxygen Carbon Question 37 1. Once processed, CNG is mostly methane gas. True False 1. The point at which the waxes in the diesel fuel crystalize at low temps and clog the filter is know as _________________. Boiling point Cloud point Crystalizing point  Hard point Question 39 1. Tech A states that CNG is lighter than air and rises when released. Tech B states propane is heavier than air and lays near the ground when released. Who is correct? Tech A Tech B Both Techs Neither Techs Question 40 1. All of the following are DISADVANTAGES of fuel cell vehicles EXCEPT: High costs Lack of refueling structure Cold weather starting issues Zero emmisions