Automotive Service Technician Red Seal Review Exam Practice Flashcards

Practice questions and answers based on the Automotive Service Technician Interprovincial (Red Seal) Review Exam transcript.

Why does a bearing shell have a small lug on the end?

It has it so that it will be put in the proper location during assembly.

What is the remedy for drill chatter?

use heavier set up

What is the function of detent pressure in relation to a transmission?

It prevents what is known as hunting condition.

A break at the crankshaft web at the nose end is usually caused by __________.

over tightened drive belts

What do voltmeters measure?

potential difference or pressure between two points

An automatic transmission stall test should never exceed how many seconds?

It should not last longer than $5\,seconds$.

What is the primary function of a solenoid?

changes electrical energy into linear motion.

How many litres are equivalent to $31\,gallons$?

$$140.9\,litres$$

What is the average pressure change for each turn of a throttle pressure adjusting screw?

Most average $2-3\,psi$ for each turn of the adjusting screw.

The minimum ultimate load for a chain is how many times its working load limit?

It must be $4\,times$ the chain's working load limit.

What is the decimal form of the fraction $8/12$?

$$0.66$$

What is indicated if automatic transmission fluid is dark brown or black with an acrid burned odor?

It could be an indication that there is clutch/band failure or severe overheating.

What does the acronym CPU stand for?

Central Processing Unit

When is the primary runner used on a tuned intake manifold?

It is used during low and moderate engine rpm operation.

Tappet noise ticking occurs at what speed?

It is at camshaft speed.

What color are hoses generally used to supply oxygen?

They are generally $green$.

Which WHMIS hazard group is NOT valid according to the notes?

An Emotional Hazard.

Automatic transmission fluid normally contains what percentage of performance additives?

$$15\,\%$$

What term describes measuring source voltage with no load connected?

open circuit voltage

How many separate forces determine basic transmission shift valve movement?

It is determined by $5\,separate\,forces$.

What are the two current styles of thermostats used on modern vehicles?

The reverse poppet design and the balanced sleeve design.

What is the most common reason for rejecting a cylinder head during an engine rebuild?

The most common reason is that it has some cracks in it.

What type of metering system is used by a multi-plunger fuel injection pump?

It uses a port and helix metering system.

Why must tapered roller bearings always be installed in pairs?

Because a taper roller bearing only provides support in one direction.

Most tire shops repair punctures up to a maximum of how many mm?

To a maximum of $6\,mm$.

Which system prevents a manual transmission from jumping out of gear?

The detent system.

What setting would a technician use for each wheel if the total toe setting is $1.5\,mm$ out?

The technician would set each wheel to read $0.75\,mm$ out.

True or False: Gears in a transmission can be used to increase horsepower.

False

How many degrees of rotation are required for systems using sensors on the harmonic balancer and camshaft to provide firing info?

$$720\,degrees$$

What is the maximum voltage applied to spark plug cables?

It can be as high as $50,000\,volts$.

Diesel fuel contains approximately what percentage of more heat energy per litre than gasoline?

It contains approximately $12\,\%$ more heat energy per litre.

What material are natural gas vehicle fuel lines made of?

High pressure annealed seamless stainless steel

What should be done during refrigerant recovery when the accumulator shows signs of frost?

It is necessary to warm the accumulator with a hot wet cloth.

Which sensor measures the density and volume of incoming air?

The mass airflow sensor.

What does a diagnostic fault code of C0550 indicate?

It would be an ECU malfunction.

At what Celsius temperature does the cooling fan typically turn on for an AC system?

When it exceeds $100\,^{\circ}C$.

Air conditioner hoses are designed to withstand pressure in excess of how many psi?

In excess of $500\,psi$.

Between Tungsten, Silver, Copper, and Gold, which is the best conductor of electricity?

Silver

Which type of test light must only be used in de-energized circuits?

Self-powered test light

What is the voltage across $R_5$ if $R_1=12\,\Omega$, $R_2=12\,\Omega$, $R_3=6\,\Omega$, $R_4=12\,\Omega$, and $R_5=4\,\Omega$?

$$2.4\,volts$$

In a reduction type converter, what is the coating mixture for the pellets?

It has a mixture of $30\,\%$ platinum and $70\,\%$ rhodium.

What is the coating used in an oxidizing catalyst with a monolith design?

It is $70\,\%$ platinum and $30\,\%$ palladium.

What is the typical measurement range for ring gear backlash?

$0.10\,mm$ to $0.30\,mm$

What percentage of a lead-acid battery electrolyte is sulphuric acid by mass?

It is approximately $36\,\%$.

A fully charged $12\,volt$ battery should read how many volts at the terminals?

It should read $12.6\,volts$.

According to the exam, a baud rate of $125\,Kbps$ is the same as how many bytes per second?

It is the same as $125,000\,bytes$ per second.

What color is a $20\,GA$ fuse link?

blue

With $20\,Amps$ of current, what is the acceptable volt drop between the battery post and the clamp?

It should be $0.2\,volts$.

What is the intake air temperature range seen with a scan tool?

$-40$ to $150\,^{\circ}C$

Audio system ground circuit resistance should be less than how many ohms?

It should be less than $0.05\,ohms$.