DGCA Piston Engine 9. Icing

Results

Q1. Carburettor heating is generally not used with take-off and climb-power settings, because of the:

Increased drag

Fire hazard involved

Impossibility of engine supplying enough heat

Loss of power and possible detonation

Q2. If the manifold pressure gauge of a piston engine shows an increase shortly after carburettor heater is turned on, it indicates:

Ice was forming in carburettor

Overheating of cylinder walls

Mixture was too lean

Excessive heat is being used

Q3. When applying precautionary carburettor heating on a reciprocating engine with a fixed pitch propeller:

The RPM increases

The RPM decreases

The mixture becomes leaner

The mixture does not change

Q4. When applying precautionary carburettor heating on a reciprocating engine with a fixed pitch propeller:

The mixture does not change

The RPM increases

The mixture becomes leaner

The mixture becomes richer

Q5. When applying precautionary carburettor heating on a reciprocating engine with a constant speed propeller:

The RPM remains constant

The RPM increases

The RPM decreases

The mixture becomes leaner

Q6. When applying precautionary carburettor heating on a reciprocating engine with a constant speed propeller:

The mixture becomes leaner

The RPM decreases

The RPM increases

The mixture becomes richer

Q7. Which statement is true concerning the effect of the application of carburettor heat?

it reduces the density of air entering the carburettor, thus leaning the fuel/air mixture

it reduces the density of air entering the carburettor, thus enriching the fuel/air mixture

it reduces the volume of air entering the carburettor, thus leaning the fuel/air mixture

it reduces the volume of air entering the carburettor, thus enriching the fuel/air mixture

Q8. Which of these statements is correct regarding piston engine induction system icing?

Ice accretion affects both fuel systems and engines equipped with carburettors.

Fuel ice is normally formed in the induction system of fuel injection systems.

Induction system icing affects only engines equipped with carburettors.

Ice on the throttle valve is usually formed in the induction system of fuel injection systems.

Q9. The first indication of carburettor icing, in aeroplanes equipped with constant speed propellers, during cruise would most likely be a:

rough running engine followed by loss in rpm

decrease in rpm

rough running engine followed by an increase in manifold pressure

decrease in manifold pressure

Q10. With respect to a piston engine aircraft, ice in the carburettor:

will only form at outside air temperatures (OAT's) below the freezing point of water

will only form at OAT's below +10°C

will only form at OAT's below the freezing point of fuel

may form at OAT's higher than +10°C

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