Chapter 26

Question 1

Normal coolant temperature should be about

Answer 1

200 to 220 degrees Fahrenheit

Question 2

The maximum back pressure of an engine at idle should be less than

Answer 2

1.5 Psi

Question 3

If the exhaust system is restricted pressure increases in the exhaust system. This pressure is called.

Answer 3

Back pressure

Question 4

An engine in proper condition should idle with a steady vacuum between

Answer 4

17 and 21 in.Hg

Question 5

When performing a cylinder leakage test, the sender being tested must be at top dead center of the blank stroke.

Answer 5

Compression

Question 6

Most vehicle manufacturers recommend a minimum oil pressure of blank per 1000 rpm.

Answer 6

10 psi

Question 7

Which of the following can cause a clicking noise in an engine

Answer 7

Loose spark plug

Question 8

Which of the following fluid is leaking from an engine if the leakage is yellow or green in color?

Answer 8

Antifreeze

Question 9

Which of the following colors of exhaust smoke indicates that an engine is burning oil

Answer 9

Blue

Question 10

oil pressure test requires that the gauge be installed blank on the engine.

Answer 10

In the place of the sending unit

Question 11

An oil pressure test shows the pressure to be 15 psi at 3000 rpm. What could be the cause of this reading?

Answer 11

Worn rod bearings.

Question 12

Which of the following may indicate antifreeze leak

Answer 12

blue green, watery fluid yellow with a sweet smell.

Question 13

A leaking head gasket can cause combustion gases to who appear in the

Answer 13

Radiator

Question 14

Technician a stated that white smoke is condensed steam.

Answer 14

True

Question 15

Technician be stated that typical causes for blue smoke include a effective throttle, body leaking fuel injector or excessive fuel pump pressure.

Answer 15

False

Question 16

Technician a stated that a murky brown colored leak under a vehicle is caused by leakage of brake or power steering fluid

Answer 16

True

Question 17

technician b stated that a green colored leak is due to a leakage of air conditioning condensate.

Answer 17

False

Question 18

A piston slap is caused by an improperly shaped piston causes a engine knock.

Answer 18

True

Question 19

Technician. A stated that a stuck oil pressure relief valve and cause low oil pressure.

Answer 19

True

Question 20

Technician b stated that a high level of oil more than the required level can also cause low oil pressure.

Answer 20

false

Question 21

The compression pressure of a running engine is much lower than the cranking compression pressure.

Answer 21

True
compression during cranking 125-160psi
compression at idle 60-90psi
compression at 2000rpm 30-60psi

Question 22

Technician. A stated that a running compression test can provide the relative compression valve cylinders in the engine.

Answer 22

True

Question 23

Technician b stated the running compression test is performed by removing one Sparkplug at a time.

Answer 23

True

Question 24

Which of the following parts is assumed to be defective if air is heard escaping from the oil filler cap

Answer 24

Piston rings

Question 25

Vacuum is pressuring below atmospheric pressure and is measured in inches or millimeters of mercury HG

Answer 25

True.

Question 26

If the exhaust system is restricted, pressure increases in the exhaust system.

Answer 26

True

Question 27

Technician a stated that turning on the heater when a coolant temperature light comes on during driving, helps to prevent possible engine damage.

Answer 27

True

Question 28

technician b stated that normal coolant temperature can be about 120 degrees Fahrenheit to 150 degrees Fahrenheit.

Answer 28

False

Question 29

Technician a says that the paper test could detect a burn the valve

Answer 29

True

Question 30

Technician b says the greatest white stain on the engine could be a coolant leak.

Answer 30

True

Question 31

Technician a says that an oil leak can be found using a fluorescent dye in the oil with a black light to check for leaks.

Answer 31

True

Question 32

Technician b says that a white spray powder can be used to locate oil leaks

Answer 32

True

Question 33

A vacuum leak is least likely to cause engine noise

Answer 33

True

Question 34

A good engine should produce how much compression during a running dynamic compression test at idle

Answer 34

30 to 60 psi

Question 35

A smoothly operating engine depends on

Answer 35

Equal compression between cylinders

Question 36

A good reading for a cylinder leak test would be

Answer 36

All cylinders below 20 percent leakage

Question 37

Technician a says that during a power balance test the cylinder that causes the biggest rpm drop is the weak cylinder

Answer 37

true

Question 38

Technician b says that if one spark plug wire is grounded out and the engine speed does not drop a weak or dead, cylinder is indicated.

Answer 38

true

Question 39

Cranking vacuum should be

Answer 39

2..5 Inch hg are higher

Question 40

Technician a says the leaking head gasket can be tested for using a chemical tester.

Answer 40

True

Question 41

Technician b says that a leaking head gasket can be found using a exhaust gas analyzer

Answer 41

True

Question 42

The low oil pressure warning light usually comes on

Answer 42

Whenever oil pressure drops dangerously below 4 to 7 psi.