What's Your Knowledge In Propulsion Of Aircrafts?

2.

What is the Major purpose of the fins which are placed around the cylinder head of an air-cooled engine?

To reduce the weight of the Engine
To allow heat to escape quickly
To reduce air from the engine compartment
To increase the air outlet in the cylinder

Correct Answer

A. To allow heat to escape quickly

Explanation

The fins placed around the cylinder head of an air-cooled engine serve the major purpose of allowing heat to escape quickly. As air flows over the fins, it helps in dissipating the heat generated during the combustion process. This prevents the engine from overheating and ensures efficient cooling. By increasing the surface area available for heat transfer, the fins enhance the cooling capacity of the engine, allowing it to operate at optimal temperatures.

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3.

The largest obtainable pitch angle on a variable pitch propeller is referred to as?

Take off pitch
Landing Pitch
Optimum pitch
Coarse Pitch

Correct Answer

A. Coarse Pitch

Explanation

The largest obtainable pitch angle on a variable pitch propeller is referred to as "Coarse Pitch." This term is used to describe the propeller blades being set at a larger angle, which allows for increased thrust and power during takeoff or when the engine needs to operate at high RPM. The coarse pitch setting helps to generate more lift and acceleration, making it suitable for situations where maximum performance is required.

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4.

The basic function of the constant speed unit (CSU) in an aircraft propeller system is to?

Feather the propeller engine
Maintain a selected engine speed power within the propeller
Maintain a constant propeller rate
Decrease the speed limit in the propeller

Correct Answer

A. Maintain a selected engine speed power within the propeller

Explanation

The constant speed unit (CSU) in an aircraft propeller system is responsible for maintaining a selected engine speed power within the propeller. This means that it adjusts the pitch of the propeller blades to maintain a constant speed and prevent overspeeding or underspeeding of the engine. By controlling the propeller speed, the CSU ensures efficient engine operation and optimal performance of the aircraft.

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5.

The two main major of cooling piston aero engines are liquid cooling and air cooling. Which of the following is a major advantage of air cooling over liquid cooling?

Its cheaper to produce
It maintains temperature better over long distance
The engine can be easily streamlined
Longer engine life

Correct Answer

A. Its cheaper to produce

Explanation

Air cooling is a major advantage over liquid cooling because it is cheaper to produce. This means that the cost of manufacturing an air-cooled piston aero engine is lower compared to a liquid-cooled engine. This cost advantage can make air-cooled engines more accessible and affordable for manufacturers and customers alike.

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6.

The process whereby airflow over the propeller blades of a failed engine keeps the propeller turning is called?

Wind milling
Propeller braking
Reverse control
Emergency braking

Correct Answer

A. Wind milling

Explanation

Wind milling refers to the process where the airflow over the propeller blades of a failed engine keeps the propeller turning. This occurs due to the force of the wind pushing against the blades, causing them to rotate. This phenomenon can happen when an engine fails or is shut down, and the aircraft is still in motion. The term "wind milling" accurately describes this process as it involves the propeller blades rotating due to the wind's force.

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7.

The purpose of the distributor in a piston aero engine, is to distribute?

Cooling the major engines
High voltage electrical impulse to all cylinders
Low voltage electrical impulse to all cylinders
Cooling air to the major parts of the cooling propeller.

Correct Answer

A. High voltage electrical impulse to all cylinders

Explanation

The purpose of the distributor in a piston aero engine is to distribute high voltage electrical impulse to all cylinders. This is important because it ensures that each cylinder receives the necessary spark at the correct time to ignite the fuel-air mixture and generate power. The distributor acts as a central hub, receiving electrical current from the ignition system and then distributing it to each spark plug in the cylinders. This ensures that the engine runs smoothly and efficiently.

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8.

One of the purposes of gudgeon pins in a piston engine is to?

Attach the pistons to their connecting rods
Fasten the two edges of the piston
Retain the Valves in the guides
Hold the sparking plugs in place

Correct Answer

A. Attach the pistons to their connecting rods

Explanation

Gudgeon pins, also known as wrist pins, play a crucial role in attaching the pistons to their connecting rods in a piston engine. These pins go through the small end of the connecting rod and the piston, allowing them to move in unison. The gudgeon pins provide a pivot point for the connecting rod, allowing it to transfer the reciprocating motion of the piston to the rotational motion of the crankshaft. This connection is vital for the proper functioning of the engine, as it ensures that the piston and connecting rod work together harmoniously to convert the energy from combustion into mechanical power.

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9.

Which of these is a turbojet engine?

Pegasus
Olympus 593
Hermes
Aramis

Correct Answer

A. Olympus 593

Explanation

The Olympus 593 is a turbojet engine.

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10.

The Blade Twist in the Propeller helps?

Even out the trust along the length of the blade
Reduce noise levels
Make propelling Easier
Increase the friction between the blades

Correct Answer

A. Even out the trust along the length of the blade

Explanation

The blade twist in the propeller helps to even out the thrust along the length of the blade. This is important because it ensures that the propeller generates a consistent amount of thrust throughout its rotation, resulting in smoother and more efficient propulsion. By distributing the thrust evenly, the propeller can maintain a balanced and stable performance, which is crucial for aircraft and other vehicles that rely on propellers for propulsion.

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What's Your Knowledge In Propulsion Of Aircrafts?

After-burning process in a jet engine requires combustion of additional fuel in the?

Quiz Preview

What is the Major purpose of the fins which are placed around the cylinder head of an air-cooled engine?

The largest obtainable pitch angle on a variable pitch propeller is referred to as?

The basic function of the constant speed unit (CSU) in an aircraft propeller system is to?

The two main major of cooling piston aero engines are liquid cooling and air cooling. Which of the following is a major advantage of air cooling over liquid cooling?

The process whereby airflow over the propeller blades of a failed engine keeps the propeller turning is called?

The purpose of the distributor in a piston aero engine, is to distribute?

One of the purposes of gudgeon pins in a piston engine is to?

Which of these is a turbojet engine?

The Blade Twist in the Propeller helps?