Automotive Service Technician Interprovincial (Red Seal) Review Exam Flashcards

Comprehensive review flashcards based on the Automotive Service Technician Interprovincial (Red Seal) Exam, covering mechanical, electrical, and safety topics.

What kind of order do automotive transmission shift valves operate in?

They operate in a progressive order.

During a lockup converter test, how many rpm should the tachometer drop after the last shift if the lockup converter is working correctly?

It should drop approximately $200$ to $400\,rpm$.

If the bore diameter of a connecting rod is measured at $75.15\,mm$, $75.18\,mm$, and $75.20\,mm$, by how many millimeters is the bore out of round?

By $0.05\,mm$.

Who is responsible for ensuring that all components of a fall protection system are compatible and suited for the work environment?

The employer.

True or False: If one integral cylinder on a block requires boring, all cylinders must be resized to the same dimensions.

True

When counting from A to F on a specific cylinder block diagram, how would the cylinders be numbered?

$6$ to $1$

How much current flow do circuits consisting of a coil allow at the instant the circuit first draws current?

Minimum current flow

The strength of a solenoid is the product of which two factors?

The product of current and number of turns of wire on the coil.

What is required in an automatic transmission torque converter to achieve torque multiplication?

Vortex flow

What does the specific WHMIS pictogram mentioned in the exam represent?

A health hazard.

Which device is defined as changing resistance with varying light levels?

Photoresistor

Who developed the first successful four-stroke cycle piston engine?

Nicholas Otto

What is the area ground away behind the cutting edges on the point of a drill bit called?

The heel.

What is the typical current level found inside a controller?

$$5\,milli\,Amps$$

According to the transcript, where does an inductive sensor mount?

It mounts to the distributor shaft.

In automatic transmissions, what component is the manual valve connected to by mechanical linkage?

The range selector.

Between diesel, gasoline, LPG, and natural gas, which is the cleanest burning fuel?

Natural gas

$1\,lb-ft$ of torque is equal to how many Newton meters ($Nm$)?

$$1.356\,Nm$$

What should a technician use to install a new valve seat in an engine?

A heating source and appropriate driver.

For which type of crankshaft would a harmonic balancer be most suitable?

An inline $8$ crankshaft.

What is the correct method for removing piston rings from a piston?

Use a ring expander to expand the ring just enough to clear the ring lands.

What is the required minimum overlap for extension ladders?

$$1\,meter$$

In automotive electronics, what is pulse width modulation?

The amount of time the voltage is turned on in one on-off cycle.

What type of control system is in use when a PCM ignores a sensor signal?

Open loop

In an automatic transmission, adjusting the pressure regulator spring tension controls what?

The maximum mainline pressure.

In a circuit with $40\,V$ applied and resistors R1=12\,̆, R2=7\,̆, R3=3\,̆, R4=9\,̆, and R5=14\,̆, what is the total current if R3 burns open?

$$0$$

What does the PASS acronym stand for regarding portable fire extinguishers?

Pull the pin, Aim the nozzle, Squeeze the handle, Sweep the nozzle.

What is the safety factor used for wire rope during general rigging and hoisting?

$$5-1$$

How many separate forces determine basic transmission shift valve movement?

$5$ separate forces

What range of clearances is green plastigage designed to measure?

$$0.025 - 0.076\,mm$$

When two gears with external teeth are in mesh, what direction do they rotate?

They will rotate in the opposite direction.

What is the first angle to consider when performing a wheel alignment?

The rear toe.

What is it called when one front wheel is positioned rearward from the other?

Setback

Which type of rack and pinion hydraulic assist has take-off racks mounted high on the firewall?

The centre take-off racks.

What is the maximum puncture diameter most tire shops will repair?

$$6\,mm$$

What benefit does a V-pattern tire block design provide?

It reduces hydroplaning.

What is the most likely cause of a vehicle shuttering when the clutch is engaged?

Damaged Marcel springs.

What type of gears are used to rotate at ninety degrees to each other?

Bevel gears

What system prevents a manual transmission from shifting into two speed ranges at once?

The interlock system.

A waste spark ignition system utilizes one coil for every how many cylinders?

One coil for every two cylinders.

Which adjustment on a steering gear eliminates play in the stub and worm shaft assembly?

The thrust bearing preload adjustment.

What is the specific purpose of using shock absorbers in conjunction with springs?

To control spring oscillation.

What is the centre wire of high voltage spark plug cables usually made of?

Metal

What tools can be used to check end play on the cluster and reverse idler of a manual transmission?

Either a dial indicator or a feeler gauge.

In a multi-plunger diesel fuel injection pump, what part's position determines the amount of fuel delivered on each stroke?

The helix.

In a perimeter type frame, what is the purpose of torque boxes?

They are designed to absorb the energy of a collision.

What is a common result of over-inflating a tire?

It could cause the tire to wear in the center.

On vehicles with automatic transmissions, the ignition lock mechanism is integrated with what?

The transmission shift mechanism.

How is toe adjustment performed on a rack and pinion suspension vehicle?

By adjusting the threaded tie rods.

What happens on an electric assist steering system when a lost sensor signal is detected?

A warning light is illuminated and the electric assist is disabled.

What is a potential cause of dog tracking?

An incorrect thrust angle.

What sensors does an electronic ignition system use to ensure correct timing?

Both crankshaft and camshaft position sensors.

To what value does the pressure regulator on a natural gas vehicle reduce pressure before sending gas to the injectors?

Less than $345\,kPa$

How long should a vacuum pump be used for checking leaks on an air conditioner system?

$$5\,minutes$$

What components are part of an AWD transfer clutch pressure system?

Transfer clutch, transfer duty solenoid, and transfer control valve.

To keep master cylinder motion reasonable, what must the clearance be between pads and the disc?

The clearance must be very small.

True or False: Disc brakes are self-energizing.

False

In an AWD vehicle with transfer clutch control, what duty ratio results in a strong clutch connection?

A small duty ratio.

What happens to the voltage signal as the throttle position is opened in an air conditioner system?

The voltage signal increases.

In terms of chemical properties, what kind of chemicals are Chlorofluorocarbons?

Stable chemicals.

What type of air conditioner system uses a fixed displacement compressor?

Cycling clutch systems.

What is the state of refrigerant as it enters the restriction?

High-pressure liquid.

In what year did tandem master cylinders become standard equipment on North American cars?

$$1967$$

Identify the component often used in conjunction with a quick take up master cylinder.

Low drag caliper

Which sensor measures the density and volume of air entering the air duct?

Mass airflow sensor

What does the term 'shoe cam grind' refer to?

A shoe manufactured slightly smaller in diameter than the drum.

Why can propane forklifts be used in adequately ventilated indoor warehouses?

The amount of $CO$ produced is significantly lower than a gasoline engine.

What happens to hydraulic pressure in the master cylinder once the primary cups move past the vent ports?

It begins to rise.

Which classification of crude oil is best for fuel production?

Paraffin crude

What is the typical cause of a brake pedal slowly sinking to the floor?

A master cylinder problem.

Which type of friction occurs between two surfaces that have relative motion?

Kinetic friction

True or False: For multiplexing to work, each module must have the same signal allowing ICs to manage them.

False

As of what date was charging a passenger vehicle air conditioning system with CFCs prohibited?

September 1, $2000$

When an NV-246 transfer case is in 2HI, where is the transmission input delivered?

Directly to the rear differential.

What is one primary function of an AC compressor regarding pressure change?

To compress low pressure vapour to high pressure vapour.

What Kind of Hydrocarbon ($HC$) result comes from a lean air-fuel ratio?

High $HC$

In an internal sensing expansion valve, where does refrigerant bleed when the operating pin pushes the ball from the seat?

Into the evaporator.

What is the feedback system for an EGR pintle position sensor?

A linear potentiometer.

If R1=12\,̆, R2=12\,̆, R3=6\,̆, R4=12\,̆, and R5=4\,̆, what is the voltage across R5?

$$2.4\,volts$$

Using the values R1=12\,̆, R2=12\,̆, R3=6\,̆, R4=12\,̆, and R5=4\,̆, what is the total current through R4?

$$0.2\,A$$

What class of rubber gloves must be worn when there is a risk of contacting high voltage on a hybrid vehicle?

Class $0$ rubber gloves

What type of test light is recommended for testing automotive electronic circuits?

Digital test light

How often must high voltage rubber gloves be sent for re-certification?

Every six months.

In differentials, how does the torque applied to the wheels relate to the reaction torque from the road?

It is equal.

What is the total resistance of a circuit containing resistors of 4\,̆, 6\,̆, and 6\,̆ in series?

$$16\,ohms$$

What type of bearing is used on a semi-floating axle?

Straight roller bearing type

True or False: Remote axle assemblies should have case bearings completely submerged when filled with oil.

False

Which side of the gear tooth represents the 'drive side' in a typical ring gear pattern?

The convex side of the gear tooth.

What type of final gear is used to turn the power path $90$ degrees?

Beveled spur

In what year was OBD2 legislation introduced to detect small leaks in evaporative emission systems?

$$1996$$

True or False: One of the conditions monitored by an enhanced EVAP system is excess vacuum.

True

At what speeds does a rough wheel bearing produce noise while coasting in neutral?

Low speeds

How many square feet of catalyst surface is found on a monolith catalytic converter?

$$485,000$$

Which component allows a controller to select seven different levels of flow?

Digital valve

What does the acronym ABS stand for?

Anti-lock Braking System

In the SAE oil classification, what does a smaller number indicate?

The oil will flow easier.

What is the function of a diverter valve?

Divert airflow to either the atmosphere or the switching valve.

How is an ammeter connected when testing an electrical circuit?

In series with the circuit.

Which hybrid power flow configuration should avoid using wheel hub motors?

Parallel

What is the correct action when a scan tool indicates a fault in an oxygen sensor circuit?

Follow the diagnostic tree for the fault indicated.