Reciprocating engines

Question 1

The five events of a four stroke cycle engine in the order of their occurrence are

Answer 1

Intake, compression, ignition, power, exhaust

Question 2

On Small aircraft engines, fuel vaporization may be increased by

Answer 2

circulating the fuel and air misture through passages in the oil sump.

Question 3

In addition to causing acceleration wear, dust, or sand ingested by a reciprocating engine may also cause

Answer 3

silicon fouling of spark plugs

Question 4

What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) seperators installed

Answer 4

Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens

Question 5

If a fire starts in the induction system during the engine starting procedure, what should the operator do?

Answer 5

Continue cranking the engine

Question 6

The action of a carburetor airscoop is to supply air to the carburetor, but is may also

Answer 6

increase the pressure of the incoming air by ram effect

Question 7

When will small induction system air leaks have the most noticeable effect on engine operation

Answer 7

at low RPM

Question 8

Which of the following statements regarding volumetric efficiency of an engine is true?

Answer 8

It is possible to exceed 100 percent volumetric efficiency of some engine by the use of superchargers of the proper type

Question 9

The purpose of an engine/inlet anti-ice system is primary to

Answer 9

prevent ice formation in engine and/or inlet areas

Question 10

Anti icing of jet engine air inlets is commonly accomplished by

Answer 10

engine bleed air ducted through the critical areas

Question 11

What part of an aircraft in flight will begin to accumulate ice before any other

Answer 11

Carburator

Question 12

Into what part of a reciprocating engine induction system is deicing alcohol normally injected

Answer 12

the airstream ahead of the carburetor

Question 13

A method commonly used to prevent carburetor icing is to

Answer 13

preheat the intake air

Question 14

Carburetor icing on an engine equipped with constant speed propeller can be detected by

Answer 14

a decrease in manifold pressure with a constant RPM

Question 15

Carburetor icing may be eliminated by which of the following methods?

Answer 15

Alcohol spray and heated induction air

Question 16

Carburetor icing is most servere at

Answer 16

Air tempertures between 30 and 40*F

Question 17

One source commonly used for carburetor air heat is

Answer 17

exhaust gases

Question 18

Where would a carburetor air heater be located in a fuel injection system?

Answer 18

none is required

Question 19

The application of carburetor heat will have which of the following effects

Answer 19

The mixture will become richer

Question 20

The application of carburetor heat during engine operation will

Answer 20

Decrease the weight of the fuel/air charge

Question 21

When operating an engine, the application of carburetor heat will have what effect of the fuel/air mixture

Answer 21

Enriching the mixture until the AMC can make a compensation

Question 22

An increase in manifold pressure when carburetor heat is applied indicates

Answer 22

ice was forming in the carburetor

Question 23

The use of the carburetor air heater when it is not needed causes

Answer 23

a decrease in power and possibly detonation

Question 24

If carburetor or induction system icing is not present when carburetor heat is applied with no change in the throttle setting, the

Answer 24

mixture will become richer

Question 25

When starting an engine equipped with a carburetor air heater, in what position should the heater be placed

Answer 25

cold

Question 26

A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the

Answer 26

loss of power and possible detonation

Question 27

Which of the following would be a factor in the failure of an engine to develop full power at takeoff

Answer 27

Improper adjustment of carburetor heat valve control linkage

Question 28

In an airplane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged, the

Answer 28

system will automatically allow warm, unfiltered air to be drawn into the engine

Question 29

During engine operation, if carburetor heat is applied, it will

Answer 29

decrease the air density of the carburetor

Question 30

Direct mechanical push pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted

Answer 30

before stop at the control lever is reached in both HOt and COLD positions

Question 31

As manifold pressure increases in reciprocating engine, the

Answer 31

density of air in the cylinder increases

Question 32

If fuel/air ratio is proper and ignition timing is correct, the combustion process should be completed

Answer 32

just after top center at the beginning of the power stroke

Question 33

When is the fuel/air mixture ignited in a conventional reciprocating engine?

Answer 33

shortly before the piston reaches the top of the compression stroke

Question 34

Valve overlap is defined as the number of degrees of crankshaft travel

Answer 34

during which both valves are off their seats

Question 35

On which strokes are both valves on a four-stroke cycle reciprocating aircraft engine open

Answer 35

Exhaust and intake

Question 36

When does valve overlap occur in the operation of an aircraft reciprocating engine?

Answer 36

At the end of exhaust stroke and the beginning of the intake stroke

Question 37

Which statement is correct regarding a four stroke cycle aircraft engine

Answer 37

the intake valve closes on the compression stroke

Question 38

If the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in

Answer 38

backfiring into the induction system

Question 39

If the exhaust valve of a four-stroke cycle engine is closed and the intake valve is just closed, the piston is on the

Answer 39

compression stroke