final Int
If the fan shroud is removed from a vehicle, _____.
the engine will overheat during prolonged idling
When testing a radiator cap, with the rated pressure applied, the cap should hold that pressure for at least _____.
1 min
The electrical system of a modern automobile runs at _____ volts when the engine is running.
14.0
A four-stroke cycle engine requires at least _____ valves at the top of each cylinder.
2
What is the current in a 12-volt circuit with a 6-ohm resistor connected series?
2
For every 1 pound of pressure put on engine coolant, the boiling point of the coolant is raised about _____ degrees Fahreheit degrees (_____ degrees Celsius).
3, 1.7
The typical recommended mixture of water and antifreeze is ______.
50/50
The voltage in a hybrid vehicle can rang up to _____ volts.
600
How many degrees of crankshaft rotation does it take to complete one complete engine cycle in a 4-stroke engine?
720
Technician A says low-drag calipers retract the pistons and pads farther from the rotor than traditional calipers. Technician B says systems that use low-drag calipers cannot use quick take-up master cylinders. Who is correct?
A only
The purpose of a pressure differential valve is being discussed. Technician A says it alerts the driver if pressure is lost in either portion of a dual braking system. Technician B says it provides the needed pressure balance between the front and rear brakes. Who is correct?
A only
What type of ICE engine listed below is commonly found in a hybrid vehicle.
Atkinson
In what type of engine is the intake valve held open longer than normal during the compression stroke?
Atkinson cycle
After replacing a vacuum booster, the brakes lock up on a road test. Technician A says there is air trapped inside the brake lines. Technician B says the power booster pushrod needs adjustment. Who is correct?
B only
Technician A says cooling system pressure is regulated by the pressure relief valve in the water pump. Technician B says cooling system pressure is regulated by the radiator cap. Who is correct?
B only
Technician A says the conventional theory of current flow states that current flows from negative to positive. Technician B says the electron current flow theory states that electrons move from negative to positive. Who is correct?
B only
Which V-type engine valve train design may use four camshafts?
DOHC
What is the name of the formula E = I x R?
Ohm's law
A simple on/off switch with one input terminal and one output is a _____type switch.
SPST [single pole, single throw]
Which of the statements concerning parallel circuits is NOT true?
The combined voltage drop of all the legs equals the total voltage drop
Technician A disconnects the battery ground cable prior to replacing a fusible link. Technician B uses a fusible link that is larger [lower gauge number] than the circuit it protects. Who is correct?
a only
Technician A says 42-volt automotive electrical systems can use smaller wires to supply the same amount of power to electrical accessories. Technician B says a 42-volt electrical system is very dangerous and can kill you if your skin comes into contact with exposed wiring. Who is correct?
a only
Technician A says high crankcase pressure can be caused by worn piston rings. Technician B says low crankcase pressure can be caused by a faulty PCV system. Who is correct?
a only
Wire sizes are being discussed. Technician A says an AWG 20 gauge wire is larger than an AWG 22 gauge wire. Technician B says a metric 1.0 gauge wire is smaller than a metric .8 gauge wire.
a only
Oil coolers are normally found on _____ vehicles.
a. all answers are correct b. diesel c. turbocharged d. high performance
Which type of resistor is commonly used in automotive circuits?
a. fixed value b. stepped c. variable d. all answers are correct
Which of the following is a function of the engine's lubrication system?
a. holds an adequate supply of oil b. removes contaminants from the oil c. delivers oil to all necessary areas of the engine d. all answers are correct
The amount of electricity produced in the vehicle's generator is dependent on _____.
a. the strength of the magnetic field b. the number of wires that are passed through the magnetic field c. the speed at which the magnetic field passes through the wires ALL OF THE ABOVE
The purpose of the master cylinder is to ______.
a. generate the hydraulic pressure needed to apply the brake mechanisms
The unit for measuring electrical current is _____.
amps
A technician is diagnosing a car that had both front brake hoses replaced 5,000 miles ago. An inspection reveals that the right front brake hose has ruptured. Technician A says the specifications called for DOT 3 fluid; using DOT 4 fluid caused the failure. Technician B says the brake hose was twisted and stressed too much when installed. Who is correct?
b only
What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump?
b. hydraulic-assist
A proportioning valve reduces fluid pressure to ______.
b. the rear brakes during hard braking
Circuit breakers are being discussed. Technician A says after the circuit breaker is tripped, it must be reset by pressing a button on the breaker. Technician B says some circuit breakers automatically reset after the power has been turned off for a few seconds. Who is correct?
both
Front engine, longitudinal layout is being discussed. Technician A says this layout is used in rear-wheel drive vehicles. Technician B says this layout is used in some front-wheel drive vehicles. Who is correct?
both
Technician A says a cooling system pressure tester is used to test for leaks in the radiator, hoses, water pump, thermostat, and engine assembly. Technician B say the cooling system pressure tester is used to check the operation of the relief valve in the radiator cap. Who is correct?
both
Technician A says a dry sump lubrication system eliminates the possibility of oil sloshing and possible oil starvation during hard cornering, braking, and acceleration. Technician B says a dry sump lubrication system allows the engine to be mounted lower in the frame, improving handling. Who is correct?
both
Technician A says an electric cooling fan may come on at any time without warning, even if the engine is not running. Technician B says an electric cooling fan may be controlled by the engine control computer. Who is correct?
both
Technician A says moving magnetic fields are a source of electrical energy in an automobile. Technician B says chemical reaction is a source of electrical energy in an automobile. Who is correct?
both
Two technicians are discussing a vehicle with an overheating problem. There are no leaks, internal or external. The belts are in good condition, and the radiator has been removed and flow tested. Everything appears to be in good condition. A new thermostat was installed, but it did not cure the problem. Technician A says the impeller could be slipping on the water pump shaft. Technician B says the impeller blades could be corroded. Who is correct?
both
Two technicians are discussing diesel engines. Technician A says all diesel engines are fuel injected. Technician B says glow plugs help ignite the fuel when the engine is cold. Who is correct?
both
Two technicians are discussing oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter becomes plugged, oil can flow directly to the bearings. Who is correct?
both
Which of the following is a source of energy in an automobile's electrical system?
both "battery" and "AC generator"
What is the function of the line printed along the length of a brake hose?
c. It indicates whether the hose is twisted.
What color is clean brake fluid?
c. clear or amber
A technician is checking a car with an owner's complaint of poor braking performance and a low brake pedal. The master cylinder is full, and there are no signs of fluid leaks in the brake system. When he holds firm pressure on the brake pedal, the pedal slowly drops. What could be the problem?
c. internally leaking master cylinder
A technician is diagnosing a vehicle with a braking system problem. When she removes the filler cap to check the fluid level in the master cylinder, she notices that the rubber seal on the cap is swollen and has begun to disintegrate. What could be the problem?
c. petroleum-based lubricants in the fluid
Which of the following engine problems may be indicated by good results from a compression test and a cylinder leakage test but poor results from a cylinder power balance test?
collapsed lifter
Both valves are closed on the _____ strokes.
compression and power
The volume of the combustion chamber when the piston is at BDC divided by the volume of the chamber when the piston is at TDC is called _____.
compression ratio
During engine warm-up, when the thermostat is closed, _____.
coolant flows through the bypass passage
In most automotive applications, the water pump is driven by the ______.
crankshaft
The reciprocating movement of the piston is converted into rotary motion by the _____.
crankshaft and connecting rod
The function of a resistor in an electrical circuit is to limit _____.
current [amperes]
A metering valve is found only on cars and trucks with ______.
d. disc front and drum rear brakes
Which of the following is NOT a component of a typical dual master cylinder?
d. pressure relief valve
Which of the following tools can be used to test the operation of the thermostat without removing it from the engine?
digital infrared thermometer
A momentary contact switch is used to operate the _____.
horn
Which one of the following is NOT a stroke of the four-stroke cycle?
ignition
______ friction is generated between the brake pads and rotors when the vehicle is descending a steep hill.
kinetic
Engine oil pressure testing is being discussed. Technician A says that oil pressure should be tested with the engine cold. Technician B says oil with viscosity that is too high may cause lower than specified pressure. Who is correct?
neither
Switches are being discussed. Technician A says that "pole" refers to the number of output circuits. Technician B says that "throw" refers to the number of input circuits. Who is correct?
neither
Technician A says when there is a complete path through the electrical circuit, the circuit is said to be open. Technician B says when the circuit path is broken or interrupted the circuit is said to be closed. Who is right?
neither
What is compression ratio?
none
The unit for measuring electrical resistance is _____.
ohms
Blue exhaust smoke is an indication of ______.
oil entering the combustion chamber
A master cylinder that has a bulge at the rear, near the mounting flange, is a _____type master cylinder.
quick take up
All the following are used as circuit protection EXCEPT:
relay
In the formula E = I x R, R represents_____.
resistance
A _____ is an electromagnet with a movable core that converts electrical current into mechanical movement.
solenoid
Secondary wire is used to power _____.
spark plugs
Which of the following cooling system hoses is normally subjected to the roughest service life?
upper radiator
In the formula E = I x R, E represents _____.
voltage
The unit for measuring electrical pressure (force) is _____.
volts
A wet compression test is performed on an engine after a dry compression test revealed low compression on one cylinder. If the compression on the low cylinder rises, it indicates _____.
worn rings
