0 [{"id":168688,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 04:23:50","updated_at":"2017-02-02 04:23:50","questionName":"The main purpose of the mixture control is to","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"The fuel\/air ratio is the ratio between the weight of fuel and the weight of air mixed together and entering the cylinders where combustion is to occur. The mixture control directly meters the amount of fuel available to be mixed with this air to obtain t","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168687,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 04:04:56","updated_at":"2017-02-02 04:04:56","questionName":"Detonation is likely to occur when","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"The primary cause of detonation is an excessive temperature of the air passing through the carburettor. Other contributory factors are: *A time-expired fuel; *An overlean mixture at high power settings; *Excessive manifold pressure; *An overheated engine ","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168291,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-01-31 03:52:24","updated_at":"2017-01-31 03:52:24","questionName":"A fuel-injection system is more efficient that a carburettor, because","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"Fuel-injection systems allow instant acceleration of the engine from idle power. The fuel-injection system supplies each cylinder with the same correct mixture; it cannot alter the mixture for individual cylinders. Impact ice can form in both the carburet","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168676,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:44:51","updated_at":"2017-02-02 03:44:51","questionName":"Compare carburettor-equipped engines with those equipped with fuel injection (Select the true statement concerning these systems)","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"Unlike normally aspirated engines which use a carburettor, fuel-injected engines are only susceptible to two major forms of icing: impace ice and throttle ice. This is because each of the cylinders are served by their own fuel discharge nozzle, thus elimi","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168290,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-01-31 03:48:50","updated_at":"2017-01-31 03:48:50","questionName":"The accelerator pump in a carburettor is used to","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"The accelerator pump is a small plunger within the float chamber, connected to the throttle linkage so that it gives an extra spurt of fuel as the throttle is opened. Hence an excessively lean mixture is avoided","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168293,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-01-31 04:00:52","updated_at":"2017-01-31 04:00:52","questionName":"In which sections of the carburettor would icing most likely occur","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"There are three major types of carburettor icing: impact ice, fuel ice and throttle ice. When fuel is introduced into the airstream, the temperature of the resulting fuel\/air mixture is lowered substantially due to the latent heat of absorption that occur","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168684,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:51:10","updated_at":"2017-02-02 03:51:10","questionName":"The mixture control is used to","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"There are two major types of mixture-control systems, the needle type and the back-suction type. Both of these systems control the amount of fuel reaching the main metering jet and therefore control the fuel\/air ratio.","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168685,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:53:52","updated_at":"2017-02-02 03:53:52","questionName":"As the aeroplane climbs at maximum continuous power, if the mixture control is left in full rich, the fuel\/air mixture will","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"As altitude is gained in a climb, the volume of air flowing through the carburettor remains the same, but the weight of air is less due to its lower density. The same weight of fuel is drawn into the airstream, however, which means the fuel\/air mixture is","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168690,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 04:43:43","updated_at":"2017-02-02 04:43:43","questionName":"The basic purpose of adjusting the mixture at altitude is","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"As altitude increases the density of the air decreases. The amount of fuel that is added to this air is determined by the volume of air passing through the carburettor not by the mass of air. Therefore, as altitude is gained the same volume of air passes ","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168292,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-01-31 03:56:36","updated_at":"2017-01-31 03:56:36","questionName":"One of the disadvantages of fuel-injection systems compared with carburettor systems is","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"Starting an already hot engine which has a fuel-injection system may be difficult due to vapour locking in the fuel lines. Electric boost pumps that pressurise the fuel lines can help to alleviate this problem. (All other Answers are advantages of a fuel-","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168686,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 04:00:18","updated_at":"2017-02-02 04:00:18","questionName":"If you do not lean the mixture during a prolonged climb, this may result in","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"Failure to lean the mixture means that the fuel\/air ratio will be too rich and this may lead to increased fuel consumption and a loss of power. There will also be a possibility of rough running, but this will not be associated with a rise in RPM as in the","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168675,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:37:01","updated_at":"2017-02-02 03:37:01","questionName":"The application of carburettor heat may cause","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"The application of carburettor heat will pass heated air through the carburettor to melt the ice that has formed there. Because warm air is less dense, the effect will be to reduce the power from the engine. This will be shown as a decrease in RPM (or man","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168689,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 04:27:49","updated_at":"2017-02-02 04:27:49","questionName":"What change occurs in the fuel\/air mixture when the carburettor heat is applied","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"The carburettor heat system usually involves heatings the induction air by passing it through a jacket that is heated by the hot exhaust system. The density of this air will be less. The amount of fuel that is added to this air is determined by the volume","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168681,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:48:34","updated_at":"2017-02-02 03:48:34","questionName":"The presence of carburettor ice in an aeroplane equipped with a fixed-pitch propeller can be verified by applying carburettor heat and noting","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"If carburettor ice is suspected apply full carburettor heat. Initally the RPM will decrease and the engine may run very roughly as the melted ice passes through the cylinders, but this will soon disappear. When the ice is cleared from the carburettor, the","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":168673,"quiz_id":"10247","answer_id":null,"answerType_id":"0","created_at":"2017-02-02 03:22:06","updated_at":"2017-02-02 03:22:06","questionName":"The low temperature that causes carburettor ice in an engine equipped with a float type carburettor is normally the result of the ","questionTimeSeconds":"0","questionTimeMinutes":"1","questionImagePath":null,"position":null,"explanation":"Both fuel vaporisation and the acceleration of the fuel\/air mixture cause a decrease in temperature as a result of the latent heat of absorption and the decrease in static pressure respectively. This decrease in temperature increases the likelihood of bot","question_score_id":null,"lang":null,"questionAudioPath":null}]

block

The main purpose of the mixture control is to

Select the correct answer(s).  

(0/0)

Explanation

The fuel/air ratio is the ratio between the weight of fuel and the weight of air mixed together and entering the cylinders where combustion is to occur. The mixture control directly meters the amount of fuel available to be mixed with this air to obtain t

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Decrease the air supplied to the engine

Adjust the fuel flow to obtain the proper fuel/air ratio

Decrease oxygen supplied to the engine

Increase the oxygen supplied to the engine

none

Detonation is likely to occur when

Select the correct answer(s).  

(0/0)

Explanation

The primary cause of detonation is an excessive temperature of the air passing through the carburettor. Other contributory factors are: *A time-expired fuel; *An overlean mixture at high power settings; *Excessive manifold pressure; *An overheated engine

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Cylinder head temperatures are low with a lean mixture

Using an overlean mixture at power settings above 65%

Operating at high power settings and full rich mixture

none

A fuel-injection system is more efficient that a carburettor, because

Select the correct answer(s).  

(0/0)

Explanation

Fuel-injection systems allow instant acceleration of the engine from idle power. The fuel-injection system supplies each cylinder with the same correct mixture; it cannot alter the mixture for individual cylinders. Impact ice can form in both the carburet

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There is no risk of impact ice forming

Of instant acceleration of the engine when power is applied

The mixture can be altered for each cylinder

none

Compare carburettor-equipped engines with those equipped with fuel injection (Select the true statement concerning these systems)

Select the correct answer(s).  

(0/0)

Explanation

Unlike normally aspirated engines which use a carburettor, fuel-injected engines are only susceptible to two major forms of icing: impace ice and throttle ice. This is because each of the cylinders are served by their own fuel discharge nozzle, thus elimi

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The carburettor system provides easier cold weather starts and a more precise control of mixture

The carburettor-equipped engine prodiceds better fuel distribution and faster throttle response

The fuel-injection system is generally considered to be less susceptible to icing

With a fuel-injection system, it is usually less difficult to start a hot engine and there is less chance of a vapour lock

none

The accelerator pump in a carburettor is used to

Select the correct answer(s).  

(0/0)

Explanation

The accelerator pump is a small plunger within the float chamber, connected to the throttle linkage so that it gives an extra spurt of fuel as the throttle is opened. Hence an excessively lean mixture is avoided

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Shut down the engine

Control the fuel/air mixture during the cruise

Control the fuel pressure

Prevent a weak-cut if the throttle is opened rapidly

none

In which sections of the carburettor would icing most likely occur

Select the correct answer(s).  

(0/0)

Explanation

There are three major types of carburettor icing: impact ice, fuel ice and throttle ice. When fuel is introduced into the airstream, the temperature of the resulting fuel/air mixture is lowered substantially due to the latent heat of absorption that occur

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Main air bleed and main discharge nozzle

Float chamber and fuel inlet screen

Accelerator pump and main metering jet

Venturi and on throttle valve

none

The mixture control is used to

Select the correct answer(s).  

(0/0)

Explanation

There are two major types of mixture-control systems, the needle type and the back-suction type. Both of these systems control the amount of fuel reaching the main metering jet and therefore control the fuel/air ratio.

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Increase the volume of air through the carburettor

Increase the fuel flow through the accelerator pump

Regulate the fuel flow to the main jet of the carburettor

Maintain the rich mixture at all altitudes

none

As the aeroplane climbs at maximum continuous power, if the mixture control is left in full rich, the fuel/air mixture will

Select the correct answer(s).  

(0/0)

Explanation

As altitude is gained in a climb, the volume of air flowing through the carburettor remains the same, but the weight of air is less due to its lower density. The same weight of fuel is drawn into the airstream, however, which means the fuel/air mixture is

---

Remain constant

Become leaner

Become richer

Become too rich to burn

none

The basic purpose of adjusting the mixture at altitude is

Select the correct answer(s).  

(0/0)

Explanation

As altitude increases the density of the air decreases. The amount of fuel that is added to this air is determined by the volume of air passing through the carburettor not by the mass of air. Therefore, as altitude is gained the same volume of air passes

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Increase the amount of fuel in the mixture to compensate for the decrease in pressure and density of the air

Decrease the amount of fuel in the mixture in order to compensate for increased air density

Decrease the fuel flow in order to compensate for decreased air density

Increase the fuel/air ratio for flying at altitude

none

One of the disadvantages of fuel-injection systems compared with carburettor systems is

Select the correct answer(s).  

(0/0)

Explanation

Starting an already hot engine which has a fuel-injection system may be difficult due to vapour locking in the fuel lines. Electric boost pumps that pressurise the fuel lines can help to alleviate this problem. (All other Answers are advantages of a fuel-

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Slower throttle response

Uneven fuel distribution to the cylinders

Poor control of fuel/air mixture

Difficulty in starting a hot engine

none

If you do not lean the mixture during a prolonged climb, this may result in

Select the correct answer(s).  

(0/0)

Explanation

Failure to lean the mixture means that the fuel/air ratio will be too rich and this may lead to increased fuel consumption and a loss of power. There will also be a possibility of rough running, but this will not be associated with a rise in RPM as in the

---

A gradual rise in RPM accompanied by rough running

An increase in power output as a result of rising RPM

Increased fuel consumption, a loss in power and possible rough running

none

The application of carburettor heat may cause

Select the correct answer(s).  

(0/0)

Explanation

The application of carburettor heat will pass heated air through the carburettor to melt the ice that has formed there. Because warm air is less dense, the effect will be to reduce the power from the engine. This will be shown as a decrease in RPM (or man

---

A decrease in fuel consumption

Excessive cylinder head temperatures

A reduction in power, and a drop in RPM

The engine to idle too fast

none

What change occurs in the fuel/air mixture when the carburettor heat is applied

Select the correct answer(s).  

(0/0)

Explanation

The carburettor heat system usually involves heatings the induction air by passing it through a jacket that is heated by the hot exhaust system. The density of this air will be less. The amount of fuel that is added to this air is determined by the volume

---

The fuel/air mixture becomes richer

A decrease in RPM results from the lean mixture

No change occurs in the fuel/air mixture

The fuel/air mixture becomes leaner

none

The presence of carburettor ice in an aeroplane equipped with a fixed-pitch propeller can be verified by applying carburettor heat and noting

Select the correct answer(s).  

(0/0)

Explanation

If carburettor ice is suspected apply full carburettor heat. Initally the RPM will decrease and the engine may run very roughly as the melted ice passes through the cylinders, but this will soon disappear. When the ice is cleared from the carburettor, the

---

An increase in RPM and then a gradual decrease in RPM

A decrease in RPM and then a gradual increase in RPM

A decrease in RPM and then a constant RPM indication

An immediate increase in RPM with no further change in RPM

none

The low temperature that causes carburettor ice in an engine equipped with a float type carburettor is normally the result of the

Select the correct answer(s).  

(0/0)

Explanation

Both fuel vaporisation and the acceleration of the fuel/air mixture cause a decrease in temperature as a result of the latent heat of absorption and the decrease in static pressure respectively. This decrease in temperature increases the likelihood of bot

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Low volatility of the fuel

Compression of air at the carburettor venturi

Freezing temperature of the air entering the carburettor

Vaporisation of fuel and acceleration of air in the carburettor