hw 2,3,5

Question 1

Energy can be changed into another form but cannot be created or destroyed.

Answer 1

True’.

Question 2

Internal combustion engines convert chemical energy into thermal energy and thermal energy into mechanical energy.

Answer 2

True’.

Question 3

Pressure and temperature are inversely proportional to each other.

Answer 3

False’.

Question 4

A typical pressure gauge will read atmospheric pressure as zero.

Answer 4

‘True’.

Question 5

Vacuum is best defined as any pressure greater than atmospheric pressure.

Answer 5

False’.

Question 6

It takes two complete camshaft revolutions and one revolution of the crankshaft to complete one engine cycle, firing all cylinders once.

Answer 6

‘False’.

Question 7

The American Petroleum Institute is a technical society that has established a classification system that standardizes oil viscosity ratings.

Answer 7

False’

Question 8

A weak valve spring will cause a steady low reading on a vacuum gauge.

Answer 8

False’.

Question 9

The combustion chamber is the space between the top of the piston and the cylinder head.

Answer 9

True’.

Question 10

Oils with a higher viscosity rating should be used in colder temperatures.

Answer 10

False

Question 11

Atmospheric pressure changes with changes in elevation.

Answer 11

True’.

Question 12

A turbocharged engine is called a normally aspirated engine.

Answer 12

False

Question 13

Twenty inches of vacuum would be equivalent to how much pressure absolute?

Answer 13

5 psia

Question 14

The principle that describes using a restriction to increase the speed of a liquid or a gas is called

Answer 14

Venturi principle

Question 15

Technician A says atmospheric pressure increases as altitude increases. Technician B says atmospheric pressure decreases as altitude increases. Who is correct?

Answer 15

Technician B only

Question 16

Barometric pressure of 14.7 psi is equivalent to a.

1 bar
b.

1 atmosphere
c.

100 kpa
d.

All of the above

Answer 16

All of the above

Question 17

If the pressure is increased on a gas in an enclosed container, the temperature of the gas will

Answer 17

Increase

Question 18

The measurement of the rate at which work is performed is measured in:

Answer 18

Horsepower

Question 19

For work to have taken place, a mass can be

Answer 19

Lifted/Moved

Question 20

Vacuum is formed on the

Answer 20

Intake stroke

Question 21

A low steady reading on a vacuum gauge connected to the intake manifold of an operating engine may be caused by;

Answer 21

Retarded ignition timing/Incorrect valve timing

Question 22

A cylinder leakage test is used to determine which of the following

Answer 22

The source of leakage from the cylinder/Measure the percentage of compression lost

Question 23

Technician A says low compression pressures could prevent combustion from occurring inside a cylinder. Technician B says compression pressure is not a factor for complete combustion. Who is correct?

Answer 23

Technician A only

Question 24

The best place to find the emission and tune-up data about a specific vehicle is the;

Answer 24

Under hood decal

Question 25

Black smoke from the exhaust is caused by

Answer 25

A rich air/fuel ratio

Question 26

The purpose of the PCV system is to: a.

Control emissions
b.

Relieve the engine’s crankcase of pressure and vapors
c.

Reduce the formation of oil sludge

Answer 26

All of the above

Question 27

The period of time that the exhaust and intake valves are both open is called valve:

Answer 27

Overlap

Question 28

The component that permits fast warm-up of the engine after it has been started is the:

Answer 28

Thermostat

Question 29

Intake manifold vacuum is the highest during

Answer 29

Deceleration

Question 30

The best way to check the efficiency of individual cylinders is a:

Answer 30

Power balance test

Question 31

Approximately how much of an engine’s energy is used to drive the vehicle?

Answer 31

15%

Question 32

Technician A says an engine with an intake manifold vacuum leak may misfire at idle and lower engine speeds. Technician B says a faster-than-normal idle speed in a fuel-injected engine may be caused by an intake manifold vacuum leak. Who is correct?

Answer 32

Both A and B

Question 33

Technician A says the exhaust gas from the cylinders of a turbocharged engine is directed past the turbine wheel. Technician B says the exhaust gas from the cylinders of a turbocharged engine is directed past the compressor wheel. Who is correct?

Answer 33

Technician A only

Question 34

A partially restricted or blocked exhaust system may result in

Answer 34

A rough ldle/Loss of engine power

Question 35

The supercharger is driven by:

Answer 35

The crankshaft

Question 36

A turbocharger may be damaged by: a.

Lack of oil
b.

Contaminants in the oil
c.

Ingestion of foreign material through the air intake

Answer 36

All of the above

Question 37

The three major automotive pollutants are:

Answer 37

HC, CO, and NOx

Question 38

Oil is found in the air filter housing. What is the most likely cause?

Answer 38

Worn piston rings/Clogged PCV valve

Question 39

Which of the following can be used to locate both exhaust and vacuum leaks?

Answer 39

Smoke, Electronic leak detector

Question 40

Which component is responsible for creating engine vacuum?

Answer 40

All of the above