1
How do you pressurize a cooling system?
With a pressurized radiator cap
Tech A says overinflation of a tire causes center wear of the tread
Tech B says under inflation of a tire causes even wear on both sides of the tire.
Who's correct?
Both
Which of the following describe the P.A.S.S. system of fire safety?
Pull, Aim, Squeeze, Sweep
You have liquid leaking on the floorboard of your car. What would cause the sweet smell of this liquid?
Anita Freeze from the leaking heater core
can you put a car on an asymmetrical lift off centered?
Yes. You should not put a car on out of balance and in a dangerous way
You can wear slightly tinted sunglasses in the auto shop. TRUE FALSE
False
What are engine gaskets not made of?
a. rubber b. cork c. composite d. steel e. glass
e. glass
A transmission that uses two pulleys, instead of gears, that change the diameter in response to load and speed
CVT
What is the FIRST step when diagnosing automatic HVAC systems?
Scan for codes
What type of freon is used in modern vehicles?
Modern vehicles (roughly 2014–present) primarily use
R-1234yf, an eco-friendly refrigerant adopted to meet strict environmental standards. For older vehicles (roughly 1994–2013), R-134a is the standard. R-1234yf is standard in new vehicles, with its use nearly universal in U.S. cars by 2021.
You have a water leak in the front passenger side of the vehicle floorboard. What could this be?
A water leak on the front passenger side floorboard is most commonly caused by a clogged A/C condensate drain tube, which forces water to back up into the cabin.
Tech A states that the charcoal canister in vehicles helps cut down emissions.
Tech B states that cat converters help monitor and help emissions.
Who's correct?
Both
What causes a stinky AC vent?
A stinky AC air vent is primarily caused by
mold and mildew buildup from excess moisture, often called "dirty sock syndrome". Common causes include clogged drain lines, dirty air filters, or bacteria on the evaporator coil. The odor is often described as musty, dirty socks, or stagnant water.
Tech A says O2 sensors are usually found in the exhaust pipes after the cat converter
TRUE or FALSE
TRUE
Thermostats are normally located between the cylinder head and radiator
TRUE. FALSE
Viscosity
API governs what of oil?
Quality
Technician A says that section 609 of the Federal Clean Air Act requires A/C technicians to be certified. Technician B says that A/C technicians must obtain a 609 license to handle refrigerants. Who is correct?
Both Technician A and B
A brake pedal that sinks to the floor (brake pedal drop) is a serious safety issue indicating a loss of hydraulic pressure. What could cause this?
.
The primary causes are a leaking brake system, air in the hydraulic lines, or a failed master cylinder,
Which electronic system is NOT an advanced driver assistance system (ADAS) feature used in automobiles?
A) LIDAR B) RADAR C) SONAR D) HYBRID
HYBRID--Correct answer
LIDAR: (Light Detection and Ranging) is a core ADAS sensor that uses laser pulses to create high-resolution 3D maps for functions like obstacle detection and lane-keeping.
RADAR: Is a fundamental ADAS component using radio waves to detect the speed and distance of objects, essential for Adaptive Cruise Control and Collision Avoidance.
SONAR: (Also known as ultrasonic sensors) is used in ADAS for short-range detection, such as Parking Assist and backup sensors, by using high-frequency sound waves.
Hesai Technology +7
Do different vehicles use the same AC Compressor oil?
No, AC compressors on cars and trucks do not always use the same oil. While many modern cars and trucks use the same type of oil (PAG), the viscosity (thickness) of that oil varies significantly based on the manufacturer, the compressor type, and the refrigerant used. Using the wrong viscosity or oil type can lead to poor lubrication, seal failure, or compressor seizure.
What active sensors can adjust suspension system ride height?
Ride height sensors(or suspension position sensors) are the active sensors that measure the distance between the road and the vehicle's chassis, allowing the Electronic Control Unit (ECU) to automatically adjust suspension ride height. They work with air suspension or active hydraulic systems to optimize comfort, aerodynamics, and ground clearance
How do you put a vehicle into service mode?
By using a scan tool or by putting a vehicle into service mode, particularly for electronic parking brake (EPB) maintenance, generally involves engaging the parking brake, turning the ignition on (without starting the engine), and then executing a specific sequence of brake pedal and parking brake switch movements. A flashing brake light or a dashboard message will confirm it is active.
What does the BCM do?
. While TSS sensors (radar/camera) detect threats, the BCM often handles the activation of body-related components like lights and alarms in response to these detections.
What does the Advanced Driver Assistance System (ADAS do)?
Advanced Driver Assistance Systems (ADAS) are electronic technologies designed to increase vehicle safety and comfort by aiding drivers with steering, braking, and monitoring, aiming to reduce traffic accidents. Key features include automatic braking, lane-keeping assist, and adaptive cruise control. However, these systems have limitations, such as potential failure in poor weather, sensor issues, and driver over-reliance.