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pplant finals Flashcards

1
Q

The temperature of the gases within the cylinder of four stoke engine during the power stoke will:

A

Decreased

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2
Q

The number of revolutions of the crankshaft required to complete a full cycle in a four stroke engine is:

A

2

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3
Q

The inlet valve opens before T.D.C in the exhaust stoke to:

A

Induce a greater amount of mixture into the cylinder.

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4
Q

The correct working cycle of a four-stroke engine is:

A

Compression, power, exhaust, induction.

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5
Q

Valve overlap is incorporated in the valve timing of a piston engine to:

A

Improve volumetric efficiency.

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6
Q

With an increase in the rotational speed of a four-stroke engine, the valve overlap:

A

Remains constant.

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7
Q

In a normally aspirated engine, exhaust back pressure:

A

Decreases as an aircraft climbs and thereby reduces the rate of decline of the engine power output.

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8
Q

When the spark ignites the mixture:

A

Temperature and pressure increase within the cylinder.

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9
Q

If the volume of a quantity of gas is halved during compression:

A

Its pressure is approximately doubled.

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10
Q

The term “Indicated Mean Effective Pressure” refer to:

A

The effective working pressure in the cylinder during the power stroke.

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11
Q

The degrees of rotation to complete a full cycle on a nine-cylinder engine will be:

A

720

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12
Q

The firing interval of a six cylinder horizontally opposed engine will be:

A

120

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13
Q

Which of the following statements would be correct for a double banked radial engine:

A

The linear distance from T.D.C to B.D.C will accommodate two throws.

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14
Q

On a four-cylinder engine with a total volume of 9,600cc, bore area of 100cm2 and a crank throw of 10cm, what would be the compression ratio be?

A

6:1

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15
Q

With an increase in outside air temperature, specific fuel consumption will:

A

Increase.

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16
Q

Combustion, in a four-stroke engine, theoretically occurs at:

A

A constant volume.

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17
Q

During the compression stroke:

A

The mass of the mixture remains the same.

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18
Q

From Top dead Centre (T.D.C) to Bottom Dead Centre (B.D.C) on the practical stoke:

A

The temperature of the gases rises for a short time then decreases.

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19
Q

In a divergent duct:

A

The temperature and pressure increase, the velocity decreases.

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20
Q

During the induction stroke:

A

The temperature of the gases reduces.

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21
Q

Ideally, maximum pressure is attained within the cylinder:

A

When combustion is complete.

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22
Q

The power output of an internal combustion engine:

A

Is proportional to the weight of the mixture induced into the cylinder.

23
Q

During the period of valve overlap:

A

The action of the exhaust gases flowing out past the exhaust valve tends to reduce the pressure in the cylinder.

24
Q

The power output of an internal combustion engine can be increased by:

A

All of the above.

25
Q

“Valve overlap” is:

A

The number of degrees of a crankshaft movement during which the inlet and exhaust valves

26
Q

The purpose of a valve spring is to:

A

Close the valve.

27
Q

Excessive blue smoke from the exhaust of an engine that has been warmed up to normal operating temperature may indicate that:

A

The piston rings are worn or stuck in their grooves.

28
Q

The camshaft of a horizontally opposed four-stroke engine rotates at:

A

Half engine speed.

29
Q

Prolonged use of low R.P.M could cause contamination of the:

A

Spark plug.

30
Q

A reduction gear is fitted:

A

Between the crankshaft and propeller

31
Q

If the starter engaged light remains on after engine start, you should:

A

Shut the engine down immediately.

32
Q

The crankshaft of an “In Line” four-cylinder aircraft engine:

A

Allows a firing order of 1-3-4-2.

33
Q

Two valve springs are fitted to each valve:

A

To reduce valve bounce.

34
Q

Excessive valve clearance:

A

Will cause the valve to open late and close early.

35
Q

Valve lead occurs when:

A

The inlet valve opens before Top Dead Centre and the exhaust valve opens before Bottom Dead Centre.

36
Q

Insufficient tappet clearance at the inlet valve would cause:

A

The valve to open early and close late.

37
Q

The length of a stroke is:

A

Equivalent to twice the crank throw.

38
Q

Tappet clearance is measured between the:

A

Valve tip and rocker pad.

39
Q

The number of revolutions required to complete the induction and compression stoke in a six cylinder four-stroke engine is:

A

2

40
Q

The purpose of a crankcase breather is to:

A

Prevent pressure building up inside the crankcase.

41
Q

Tappet clearance is provided in a piston engine to:

A

Allow for expansion of the valve gear as the engine warms up.

42
Q

Piston rings are manufactured from cast iron:

A

Because of its self-lubricating qualities.

43
Q

Brake horsepower is:

A

Useful power at the propeller.

44
Q

A method of improving “Volumetric Efficiency” is:

A

Valve overlap.

45
Q

The ratio of the power produced by an engine to the power available in the fuel is known as the:

A

Thermal efficiency.

46
Q

Specific fuel consumption (S.F.C.)

A

Is the weight of fuel used by an engine per unit horsepower per unit time.

47
Q

Exhaust valves are:

A

Sometimes have their stems partly filled with sodium to assist cooling.

48
Q

Volumetric efficiency may be defined as:

A

The ratio of the volume of the mixture drawn into the cylinder during the normal engine working, to the volume of the mixture which would be required to fill the cylinder under normal temperature and pressures.

49
Q

The compression ratio of an engine may be defined as the:

A

Swept volume+ clearance volume divided by clearance volume.

50
Q

An engine has a total volume of 2,100 cm3 and a swept volume of 1,800 cm3. Its compression ratio is:

A

7:1

51
Q

The thermal efficiency of a Piston engine can be increased by:

A

Increasing the compression ratio.

52
Q

Hydraulic valve tappets are used on some engines to:

A

Eliminate constant valve adjustment and checks.

53
Q

A normally aspirated engine is one which:

A

Is not supercharged.

54
Q

The swept volume of a cylinder is:

A

The area of the piston crown X the stroke.

tep (5 decks)

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