AED&R pre test

Question 1

Two technicians are discussing “blowby.” Technician A says that “blowby” is gases escaping past the valves. Technician B says that “blowby” is gases escaping past the rings. Which technician is correct?

Answer 1

Technician B

Question 2

Excessive clearance at a connecting rod bearing journal will cause a rod knock.

Answer 2

True

Question 3

Technician A says aluminum heads can be checked for cracks with a process known as magnafluxing. Technician B says a red dye penetrant can be used to check for cracks on cast iron heads. Which technician is correct?

Answer 3

?

Question 4

During a compression test, a cylinder shows lower readings than expected. Technician A squirts a tablespoon of oil into the cylinder and the compression raises. He says this indicates a problem with the rings. Technician B says this indicates a burned intake valve. Which technician is correct?

Answer 4

Technician A

Question 5

Valves will contract as they warm up during use.

Answer 5

False

Question 6

All of the following are timing components EXCEPT _____.

Answer 6

?

Question 7

Technician A says that for each pound of pressure on the cooling system, the boiling point raises one degree Fahrenheit. Technician B says engine rebuilders epoxy heat tabs to the cylinder heads to protect against dishonest warranty claims. Who is correct?

Answer 7

Technician B

Question 8

What instrument can determine the coolant’s conductivity?

Answer 8

?

Question 9

The tenth digit of the VIN code will identify the engine size.

Answer 9

False

Question 10

Oil is being discussed. Technician A says oil never wears out. Technician B says there are many additives in oil that will become depleted during engine operation. Who is correct?

Answer 10

?

Question 11

A thermostat is installed with its temperature bulb facing the radiator.

Answer 11

False

Question 12

Springs that have been overheated will stretch and be longer.

Answer 12

False

Question 13

Technician A says a windage tray helps to keep air pockets out of the oil at high speeds. Technician B says the lubrication system should be primed before starting an engine that has just been rebuilt. Who is right?

Answer 13

Both technicians

Question 14

Of the measuring devices listed below, which is the most accurate in measuring cylinder bore size?

Answer 14

cylinder dial bore gauge

Question 15

An engine has excessive valve guide wear Technician A says to ream the guide and install a new valve with an oversize stem.

Technician B says to knurl the valve stem and reinstall it into the guide. Who is correct?

Answer 15

?

Question 16

Automobile piston pins are either pressed fit or full floating.

Answer 16

True

Question 17

Technician A says springs should be tested for squareness, tension, and height. Technician B says to stack shims under a valve spring until the spring pressure is correct. Who is correct?

Answer 17

?

Question 18

Technician A says that basket-type coil springs are installed with the tighter part of the coil against the head. Technician B says grinding a valve seat will not affect the installed height of the valve spring. Who is correct?

Answer 18

?

Question 19

Technician A says that the top compression ring groove wears more than the other ring grooves. Technician B says that full floating, piston pin lock rings should be installed with their openings facing up. Who is correct?

Answer 19

?

Question 20

Piston rings are made from all these materials, EXCEPT _____.

Answer 20

?

Question 21

Technician A says powder forged rods are not cut; they are fractured (broken). Technician B says some rods have a spit hole to lubricate the cylinder walls at lower rpms. Who is right?

Answer 21

?

Question 22

Technician A says that before a valve guide can be repaired, the valve seat should always be ground. Technician B says the exhaust and intake valves each operate on a separate lobe on the camshaft. Who is correct?

Answer 22

?

Question 23

Modern day engines can have _____ valves per cylinder.

Answer 23

?

Question 24

The engine should be cold before removing the head.

Answer 24

True

Question 25

Turbochargers are driven by _____.

Answer 25

exhaust flow

Question 26

An engine with a turbocharger is a normally aspirated engine.

Answer 26

False

Question 27

Viscosity is a term used to describe the thickness or body of engine oil.

Answer 27

True

Question 28

Technician A says to label the core plugs as they are removed so they can be reinstalled. Technician B says to remove the core plugs before hot tanking the block. Who is correct?

Answer 28

Technician B

Question 29

Technician A says aluminum heads usually have an aluminum shim beneath the valve spring. Technician B says as the valves are removed from the head, they should be kept in order. Who is correct?

Answer 29

?

Question 30

An oil is rated at 10W-40. The “W” means winter grade.

Answer 30

True

Question 31

Cam-in-block engines use pushrods to transmit motion from the lifters to the rocker arms.

Answer 31

True

Question 32

The camshaft controls the rate at which the engine breathes.

Answer 32

True

Question 33

Technician A says there is no need to lubricate the valve stems upon reassembly. Technician B says intake and exhaust seals are the same materials and shapes. Who is correct?

Answer 33

?

Question 34

Technician A says that most automotive gasoline engines have four strokes per cycle. Technician B says that the crankshaft makes four revolutions during the four-stroke cycle. Which technician is correct?

Answer 34

?

Question 35

Water pumps are sometimes driven by the timing belt.

Answer 35

True

Question 36

A 30% water and 70% antifreeze is the maximum mixture that should be used.

Answer 36

True

Question 37

After glaze breaking or cylinder honing, clean the block with _____.

Answer 37

?

Question 38

Undersize bearings have a thinner bearing back.

Answer 38

False

Question 39

What cylinder number is the closest to the front of the engine on almost all V-type engines?

Answer 39

1

Question 40

Technician A says most manufacturers recommend a minimum of 25 psi of oil pressure for every 1000 rpm. Technician B says short trips allow sludge to accumulate. Who is right?

Answer 40

?

Question 41

Technician A says a piston usually has a direction identifying notch that faces the rear of the engine. Technician B says a piston exhibits more wear on its major thrust side. Who is right?

Answer 41

Technician B

Question 42

Technician A says a faulty head gasket can cause the oil to mix with coolant. Technician B says bubbles forming in the coolant during engine operation could indicate a leaking head gasket. Which technician is correct?

Answer 42

?

Question 43

Technician A says that during engine disassembly, all main and rod bearings should be kept in order in case they will be reused. Technician B says that there is no need to keep bearings in order if new parts are to be used. Who is right?

Answer 43

?

Question 44

Technician A says a mushroomed valve can be driven out with a punch and a hammer. Technician B says the mushroomed tip must be dressed with a file before the valve can be removed. Who is right?

Answer 44

Technician B

Question 45

Technician A says valve overlap occurs at the bottom of the intake stroke. Technician B says valve overlap occurs at the top of the intake stroke. Who is correct?

Answer 45

Technician B

Question 46

How many degrees of crankshaft rotation is a complete cycle of a four stroke engine?

Answer 46

?

Question 47

Technician A says on a flat tappet engine, the lifters do not need to be replaced when the camshaft is replaced. Technician B says when replacing a roller camshaft, the lifters must be replaced. Who is correct?

Answer 47

Neither technician

Question 48

Excessive clearance at a main bearing will result in low oil pressure at the rocker arms or valve lifters.

Answer 48

True

Question 49

Two factors of cam lobe profile are called lift and length.

Answer 49

False

Question 50

Another term for mechanical lifter is tappet.

Answer 50

True