AUT-150-101 Final || 100% Verified Solutions.
Technician A says that natural gas can be obtained from crude oil. Technician B says that
gasoline can be obtained from crude oil. Who is correct? correct answers C)
Both A and B.
Technician A says that gasoline with a low octane rating can reduce an engine's power
efficiency. Technician B says that gasoline with a low octane rating can lower an automotive
engine's fuel economy. Who is correct? correct answers C)
Both A and B.
Technician A says that the camshaft lobe shown on the left on page 179 will provide better
torque at lower engine speeds than the lobe shown on the right on page 179. Technician B
says that the camshaft lobe shown on the right will provide better power at higher engine
speeds than the lobe shown on the left. Who is correct? correct answers C)
Both A and B.
All of the following are general grades of gasoline currently sold in the US except: correct
answers leaded
Technician A says that normal combustion occurs in a gasoline engine when a single flame
spreads evenly and uniformly away from the spark plug electrodes. Technician B says that
normal combustion occurs in a gasoline engine when dual flames spread evenly and
uniformly away from the spark plug electrodes. Who is correct? correct answers A)
A only.
Technician A says that preignition occurs when the last unburned portion of the fuel mixture
almost explodes in the combustion chamber. Technician B says that preignition occurs when
a hot spot ignites the fuel mixture in the combustion chamber before the spark plug fires.
Who is correct? correct answers B)
B only.
Surface ignition can be caused by a(n) _____.
A)
sharp edges in the combustion chamber
B)
overheated spark plug
C)
glowing piece of carbon in the combustion chamber
D)
All of the above. correct answers D)
All of the above.
Technician A says that under certain circumstances engine detonation can crack an engine's
cylinder head. Technician B says that under certain circumstances engine detonation can
actually melt an engine's piston. Who is correct? correct answers C)
Both A and B.
, Technician A says that ignition timing can affect the quality of engine combustion.
Technician B says that intake manifold pressure can affect the quality of engine combustion.
Who is correct? correct answers C)
Both A and B.
A customer complains of engine overheating, but only at idle. The system is full of coolant
and the belt has the proper tension. Technician A notices a missing fan shroud and says that
could be the cause of overheating. Technician B says the thermostat stuck closed could cause
the problem. Who is correct? correct answers A)
Technician A.
An electric engine fan fails to turn on when the engine warms up. Technician A says the first
step is to remove and test the fan motor. Technician B says simply apply battery voltage
directly to the motor at the fan switch. Who is correct? correct answers B)
Technician B.
Technician A says that an automotive engine's operating temperature is normally between
220°F and 250°F (105°C and 120°C). Technician B says that an engine's operating
temperature is normally between 180°F and 195°F (80°C and 90°C). Who is correct? correct
answers B)
B only.
Technician A says that a liquid-cooled system is better than an air-cooled system because it
improves the efficiency of the passenger compartment heater. Technician B says that a liquid-
cooled system is better than an air-cooled system because engine temperature is more
precisely controlled. Who is correct? correct answers C)
Both A and B.
A closed cooling system has a (n) _____ to prevent excess coolant from draining onto the
ground. correct answers coolant reservoir & overflow tube
All of the following will cause an automotive engine to overheat except: correct answers C)
a locked fan clutch.
Technician A says that when the engine is cold, coolant should flow through the radiator.
Technician B says that when the engine is hot, coolant should not flow through the radiator.
Who is correct? correct answers D)
Neither A nor B.
Technician A says that a 10W-30 engine oil has the properties of a 10 weight oil when it is
hot. Technician B says that a low-viscosity engine oil is thin and flows easily. Who is
correct? correct answers B)
B only.
All of the following are causes of low engine oil pressure except: correct answers C)
restricted oil gallery.
When performing an oil pressure test, the pressure gauge should be attached to the _____.
correct answers B)
oil pressure sending unit hole
Technician A says that natural gas can be obtained from crude oil. Technician B says that
gasoline can be obtained from crude oil. Who is correct? correct answers C)
Both A and B.
Technician A says that gasoline with a low octane rating can reduce an engine's power
efficiency. Technician B says that gasoline with a low octane rating can lower an automotive
engine's fuel economy. Who is correct? correct answers C)
Both A and B.
Technician A says that the camshaft lobe shown on the left on page 179 will provide better
torque at lower engine speeds than the lobe shown on the right on page 179. Technician B
says that the camshaft lobe shown on the right will provide better power at higher engine
speeds than the lobe shown on the left. Who is correct? correct answers C)
Both A and B.
All of the following are general grades of gasoline currently sold in the US except: correct
answers leaded
Technician A says that normal combustion occurs in a gasoline engine when a single flame
spreads evenly and uniformly away from the spark plug electrodes. Technician B says that
normal combustion occurs in a gasoline engine when dual flames spread evenly and
uniformly away from the spark plug electrodes. Who is correct? correct answers A)
A only.
Technician A says that preignition occurs when the last unburned portion of the fuel mixture
almost explodes in the combustion chamber. Technician B says that preignition occurs when
a hot spot ignites the fuel mixture in the combustion chamber before the spark plug fires.
Who is correct? correct answers B)
B only.
Surface ignition can be caused by a(n) _____.
A)
sharp edges in the combustion chamber
B)
overheated spark plug
C)
glowing piece of carbon in the combustion chamber
D)
All of the above. correct answers D)
All of the above.
Technician A says that under certain circumstances engine detonation can crack an engine's
cylinder head. Technician B says that under certain circumstances engine detonation can
actually melt an engine's piston. Who is correct? correct answers C)
Both A and B.
, Technician A says that ignition timing can affect the quality of engine combustion.
Technician B says that intake manifold pressure can affect the quality of engine combustion.
Who is correct? correct answers C)
Both A and B.
A customer complains of engine overheating, but only at idle. The system is full of coolant
and the belt has the proper tension. Technician A notices a missing fan shroud and says that
could be the cause of overheating. Technician B says the thermostat stuck closed could cause
the problem. Who is correct? correct answers A)
Technician A.
An electric engine fan fails to turn on when the engine warms up. Technician A says the first
step is to remove and test the fan motor. Technician B says simply apply battery voltage
directly to the motor at the fan switch. Who is correct? correct answers B)
Technician B.
Technician A says that an automotive engine's operating temperature is normally between
220°F and 250°F (105°C and 120°C). Technician B says that an engine's operating
temperature is normally between 180°F and 195°F (80°C and 90°C). Who is correct? correct
answers B)
B only.
Technician A says that a liquid-cooled system is better than an air-cooled system because it
improves the efficiency of the passenger compartment heater. Technician B says that a liquid-
cooled system is better than an air-cooled system because engine temperature is more
precisely controlled. Who is correct? correct answers C)
Both A and B.
A closed cooling system has a (n) _____ to prevent excess coolant from draining onto the
ground. correct answers coolant reservoir & overflow tube
All of the following will cause an automotive engine to overheat except: correct answers C)
a locked fan clutch.
Technician A says that when the engine is cold, coolant should flow through the radiator.
Technician B says that when the engine is hot, coolant should not flow through the radiator.
Who is correct? correct answers D)
Neither A nor B.
Technician A says that a 10W-30 engine oil has the properties of a 10 weight oil when it is
hot. Technician B says that a low-viscosity engine oil is thin and flows easily. Who is
correct? correct answers B)
B only.
All of the following are causes of low engine oil pressure except: correct answers C)
restricted oil gallery.
When performing an oil pressure test, the pressure gauge should be attached to the _____.
correct answers B)
oil pressure sending unit hole
