Gte Tutorial 1 MCQ
Gte tutorial 1 MCQsTerm Test Practice
Questions and Answers
- 1.
The turbine section of a jet engine
- A.
Increases air velocity to generate thrust forces.
- B.
Utilizes heat energy to expand and accelerate the incoming gas flow.
- C.
Drives the compressor section.
Correct Answer
C. Drives the compressor section.Explanation
The turbine section of a jet engine is responsible for driving the compressor section. The compressor section compresses the incoming air, increasing its pressure before it enters the combustion chamber. The turbine section is connected to the compressor section through a shaft, and as the hot gases from the combustion chamber flow through the turbine, they cause the turbine blades to rotate. This rotation is then transferred to the compressor blades, which helps to compress the incoming air. Therefore, the turbine section drives the compressor section in a jet engine.Rate this question:
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- 2.
The velocity of subsonic air as it flows through a convergent nozzle
- A.
Increases.
- B.
Decreases.
- C.
Remains constant.
Correct Answer
A. Increases.Explanation
The velocity of subsonic air as it flows through a convergent nozzle increases. This is because the convergent shape of the nozzle causes the cross-sectional area to decrease, resulting in an increase in the velocity of the air to conserve mass flow rate. As the area decreases, the air molecules have less space to occupy, leading to an increase in their speed. Therefore, the velocity of subsonic air increases as it flows through a convergent nozzle.Rate this question:
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- 3.
The pressure of subsonic air as it flows through a convergent nozzle
- A.
Increases.
- B.
Decreases.
- C.
Remains constant
Correct Answer
B. Decreases.Explanation
As air flows through a convergent nozzle, its velocity increases, causing a decrease in pressure according to Bernoulli's principle. This principle states that as the velocity of a fluid increases, its pressure decreases. Therefore, the correct answer is that the pressure of subsonic air decreases as it flows through a convergent nozzle.Rate this question:
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- 4.
In a jet engine, the
- A.
Compressor drives the turbine.
- B.
Air enters at the turbine.
- C.
Turbine drives the compressor.
Correct Answer
C. Turbine drives the compressor.Explanation
In a jet engine, the turbine drives the compressor. This means that the turbine, which is powered by the combustion of fuel, is responsible for driving the compressor. The compressor, in turn, is responsible for compressing the incoming air before it enters the combustion chamber. This compressed air is then mixed with fuel and ignited to produce the necessary thrust for the jet engine. Therefore, the correct answer is that the turbine drives the compressor.Rate this question:
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- 5.
When the stem of an inflated balloon is released, the balloon will
- A.
Move in the direction of the stem.
- B.
Move in the opposite direction of the stem.
- C.
Remain stationary
Correct Answer
B. Move in the opposite direction of the stem.Explanation
When the stem of an inflated balloon is released, the air inside the balloon will rush out in the opposite direction of the stem. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. As the air is forced out of the balloon through the stem, it exerts a force in the opposite direction, causing the balloon to move in the opposite direction of the stem.Rate this question:
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- 6.
The statement “To every action, there is an equal and opposite reaction” is
- A.
Bernoulli’s Theorem.
- B.
Newton’s third Law of Motion.
- C.
Newton’s first Law of Motion.
Correct Answer
B. Newton’s third Law of Motion.Explanation
The statement "To every action, there is an equal and opposite reaction" is associated with Newton's third Law of Motion. This law states that for every action force exerted on an object, there is an equal and opposite reaction force exerted by the object. It explains the relationship between the forces acting on two interacting objects, emphasizing that the forces are equal in magnitude and opposite in direction.Rate this question:
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- 7.
Rockets are unable to accelerate in space because:
- A.
There is no air in space for the rockets to push off from.
- B.
There is no air resistance in space.
- C.
Nonsense! Rockets do accelerate in space.
Correct Answer
C. Nonsense! Rockets do accelerate in space.Explanation
The given answer is correct. Rockets are able to accelerate in space despite the absence of air. This is because rockets work on the principle of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In space, rockets can expel high-speed exhaust gases in one direction, creating a force in the opposite direction that propels the rocket forward. This allows rockets to accelerate and move through the vacuum of space.Rate this question:
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- 8.
The statement “To every action, there is an equal and opposite reaction” is
- A.
Bernoulli’s Theorem.
- B.
Newton’s third Law of Motion.
- C.
Newton’s first Law of Motion.
Correct Answer
B. Newton’s third Law of Motion.Explanation
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal magnitude but in the opposite direction on the first object. This law explains the concept of force pairs and is a fundamental principle in physics. Bernoulli's theorem, on the other hand, relates to fluid dynamics, while Newton's first law of motion states that an object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by an external force.Rate this question:
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- 9.
Newton’s first law of motion states:
- A.
For every action there is an equal and opposite reaction.
- B.
A body will continue to remain at rest or in uniform motion in a straight line unless acted upon by an external force
- C.
The rate of change of momentum of a body is proportional to the force applied to it.
Correct Answer
B. A body will continue to remain at rest or in uniform motion in a straight line unless acted upon by an external forceExplanation
This answer is correct because it accurately states Newton's first law of motion. According to this law, an object will remain at rest or continue moving in a straight line at a constant speed unless an external force acts upon it. This means that an object will not change its state of motion unless there is a force that causes it to do so.Rate this question:
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- 10.
Kinetic energy is attributed to:
- A.
Pressure
- B.
Motion
- C.
Altitude
Correct Answer
B. MotionExplanation
Kinetic energy is the energy possessed by an object due to its motion. It is directly related to the object's mass and velocity. When an object is in motion, it has the ability to do work and transfer energy. Therefore, motion is the attribute that is directly associated with kinetic energy. Pressure and altitude, on the other hand, are not directly related to an object's motion and do not contribute to its kinetic energy.Rate this question:
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- 11.
Power is defined as the rate of:
- A.
Application of a force
- B.
Change in velocity
- C.
Doing work
Correct Answer
C. Doing workExplanation
Power is defined as the rate at which work is done. It measures how quickly work is being done or the amount of work done per unit time. Therefore, the correct answer is "Doing work" because power is directly related to the amount of work being done.Rate this question:
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- 12.
Force is the product of mass and:
- A.
Velocity
- B.
Acceleration
- C.
Distance
Correct Answer
B. AccelerationExplanation
Force is the product of mass and acceleration. This is explained by Newton's second law of motion, which states that the force acting on an object is directly proportional to its mass and the acceleration it experiences. Acceleration is the rate at which an object's velocity changes over time, so when a force is applied to an object, it causes it to accelerate. Therefore, the correct answer is acceleration.Rate this question:
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- 13.
A turbo-fan engine is:
- A.
An engine with a propeller
- B.
A single spool engine
- C.
A by-pass engine
Correct Answer
C. A by-pass engineExplanation
A turbo-fan engine is a type of engine that has a by-pass feature. This means that a portion of the air taken in by the engine bypasses the combustion process and is instead directed around the engine core. This bypassed air provides additional thrust, resulting in improved fuel efficiency and reduced noise compared to other engine types. Unlike a propeller engine, which uses a rotating blade to generate thrust, a turbo-fan engine uses a fan to create thrust. Additionally, a turbo-fan engine can have multiple spools, but it is not necessarily a single spool engine.Rate this question:
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- 14.
A turbo-shaft engine is:
- A.
An engine that drives something other than a propeller
- B.
An engine that drives a propeller
- C.
free turbine engine
Correct Answer
A. An engine that drives something other than a propellerExplanation
A turbo-shaft engine is an engine that drives something other than a propeller. This means that it is designed to provide power for applications other than propulsion, such as driving a generator, hydraulic pump, or rotor system in a helicopter. Unlike a turbo-prop engine, which is specifically designed to drive a propeller, a turbo-shaft engine is used in situations where direct thrust is not required, but rather the rotational power is needed for other purposes.Rate this question:
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- 15.
What turbine engine section provides for proper mixing of the fuel and air?
- A.
Combustion section
- B.
Compressor section
- C.
Diffuser section
Correct Answer
A. Combustion sectionExplanation
The combustion section of a turbine engine is responsible for proper mixing of the fuel and air. This section is where the fuel is injected into the compressed air and ignited, resulting in the release of energy. The combustion process ensures that the fuel and air mixture is burned efficiently, producing the necessary power to drive the engine. Without proper mixing in the combustion section, the engine would not be able to generate the thrust required for propulsion.Rate this question:
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- 16.
A gas turbine engine comprises which three main sections?
- A.
Compressor, diffuser, and stator.
- B.
Turbine, combustion, and stator.
- C.
Turbine, compressor, and combustion.
Correct Answer
C. Turbine, compressor, and combustion.Explanation
A gas turbine engine consists of three main sections: the turbine, compressor, and combustion. The turbine converts the energy in the hot gases into mechanical energy, which is used to power the compressor and any external devices. The compressor takes in air and compresses it, increasing its pressure and temperature. The compressed air then enters the combustion chamber, where it mixes with fuel and ignites, creating a high-temperature and high-pressure gas. This gas expands through the turbine, driving its blades and producing the mechanical energy needed to power the engine.Rate this question:
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- 17.
Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called
- A.
Buckets.
- B.
Rotors.
- C.
Stators.
Correct Answer
C. Stators.Explanation
In a turbine engine compressor, there are rows of rotating blades that help compress the air. However, between each row of rotating blades, there is a row of stationary blades that serve to diffuse the air. These stationary blades are commonly referred to as stators.Rate this question:
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- 18.
The air passing through the combustion chamber of a turbine engine is
- A.
Used to support combustion and to cool the engine.
- B.
Entirely combined with fuel and burned.
- C.
Speeded up and heated by the action of the turbines.
Correct Answer
A. Used to support combustion and to cool the engine.Explanation
The air passing through the combustion chamber of a turbine engine is used to support combustion and to cool the engine. This is because the air is mixed with fuel in the combustion chamber to create a combustible mixture that generates the necessary energy for the engine to function. Additionally, the air also serves the purpose of cooling the engine by absorbing heat from the combustion process, preventing overheating and potential damage to the engine components.Rate this question:
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- 19.
The compressor stators in a gas turbine engine act as diffusers to
- A.
Decrease the velocity of the gas flow.
- B.
Increase the velocity of the gas flow.
- C.
Increase the velocity and decrease the pressure of the gas.
Correct Answer
A. Decrease the velocity of the gas flow.Explanation
The compressor stators in a gas turbine engine act as diffusers, which means they slow down the velocity of the gas flow. This is important because it allows the compressor to efficiently compress the air and increase its pressure before it enters the combustion chamber. By decreasing the velocity of the gas flow, the compressor stators help in maintaining a steady and controlled flow of air through the engine, which is necessary for optimal performance.Rate this question:
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- 20.
At what stage in a turbine engine are gas pressures the greatest?
- A.
Compressor inlet.
- B.
Turbine outlet.
- C.
Compressor outlet.
Correct Answer
C. Compressor outlet.Explanation
In a turbine engine, the gas pressures are the greatest at the compressor outlet. The compressor is responsible for compressing the incoming air, which increases its pressure before it enters the combustion chamber. As the air passes through the compressor, the pressure gradually increases, reaching its highest point at the compressor outlet. This high-pressure air is then directed to the combustion chamber, where it mixes with fuel and ignites to produce the necessary thrust for the engine.Rate this question:
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