Tripoli Level 2 Cert Test with correct answers
Which of Newton's Laws best describes the behavior of a rocket motor? - correct
answerNewton's Third Law: To every action there is always an equal and opposite reaction.
How does Newton's Third Law "To every action there is always an equal and opposite reaction"
relate
to rocketry? - correct answerThat a rocket flies because the rocket motor "pushes" the rocket in
a direction opposite of the exhaust jet.
What are the three forces acting upon a rocket during the course of its flight? - correct
answerGravity, thrust and aerodynamic drag.
What are the three major factors that determine the maximum altitude of a high power rocket
in vertical flight? - correct answerMotor thrust, weight and aerodynamic drag.
For an inherently stable rocket, which statement about the center of gravity (CG) and the center
of pressure (CP)
is true? - correct answerThe CG must be forward of the CP relative to the desired direction of
flight
A 4" diameter rocket with its motor is determined to have the center of gravity (CG) four inches
behind the
center of pressure (CP). Is this a rocket likely to be stable? - correct answerNo, the CP must be
behind the CG for the rocket to be stable.
The center of pressure (CP) of a rocket is generally defined as: - correct answerThe point at
which aerodynamic lift on a rocket is centered.
What is the "rule-of-thumb" for a stable rocket? - correct answerThat the center of gravity
should be at least one body diameter in front of the center of pressure.
, You are at the launch site and decide to fly your rocket on a heavier motor than you simulated it
on.
Which statement regarding CG is true? - correct answerOne can install the motor, recovery
system and payload and determine the balance point of the rocket as it is ready for flight
What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor's
thrusting phase? - correct answerThe CG shifts forward.
How can a statically unstable rocket be made stable? - correct answerAdding weight to the nose
What are three methods used to shift the center of gravity (CG) of a rocket forward? - correct
answerAdd weight to the nose, make the rocket longer, use a smaller (or lighter) motor.
What are three methods used to shift the center of pressure (CP) aft? - correct answerMake the
rocket shorter, use larger fins, increase the number of fins
The definition of coefficient of drag (Cd) is: - correct answerA dimensionless number dependent
on the rocket configuration, Mach number and angle of attack
What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound? -
correct answerThe Cd increases.
For a subsonic rocket, what factors most greatly affect the coefficient of drag (Cd)? - correct
answerSpeed, airframe dimensions, nosecone shape and fin shape.
What effect does a boat tail have on a subsonic rocket's coefficient of drag (Cd)? - correct
answerIt decreases the Cd by reducing the base drag.
The flight of a high power rocket can be separated into three portions; they are: - correct
answerPowered flight, un-powered ascent and descent.
Which of Newton's Laws best describes the behavior of a rocket motor? - correct
answerNewton's Third Law: To every action there is always an equal and opposite reaction.
How does Newton's Third Law "To every action there is always an equal and opposite reaction"
relate
to rocketry? - correct answerThat a rocket flies because the rocket motor "pushes" the rocket in
a direction opposite of the exhaust jet.
What are the three forces acting upon a rocket during the course of its flight? - correct
answerGravity, thrust and aerodynamic drag.
What are the three major factors that determine the maximum altitude of a high power rocket
in vertical flight? - correct answerMotor thrust, weight and aerodynamic drag.
For an inherently stable rocket, which statement about the center of gravity (CG) and the center
of pressure (CP)
is true? - correct answerThe CG must be forward of the CP relative to the desired direction of
flight
A 4" diameter rocket with its motor is determined to have the center of gravity (CG) four inches
behind the
center of pressure (CP). Is this a rocket likely to be stable? - correct answerNo, the CP must be
behind the CG for the rocket to be stable.
The center of pressure (CP) of a rocket is generally defined as: - correct answerThe point at
which aerodynamic lift on a rocket is centered.
What is the "rule-of-thumb" for a stable rocket? - correct answerThat the center of gravity
should be at least one body diameter in front of the center of pressure.
, You are at the launch site and decide to fly your rocket on a heavier motor than you simulated it
on.
Which statement regarding CG is true? - correct answerOne can install the motor, recovery
system and payload and determine the balance point of the rocket as it is ready for flight
What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor's
thrusting phase? - correct answerThe CG shifts forward.
How can a statically unstable rocket be made stable? - correct answerAdding weight to the nose
What are three methods used to shift the center of gravity (CG) of a rocket forward? - correct
answerAdd weight to the nose, make the rocket longer, use a smaller (or lighter) motor.
What are three methods used to shift the center of pressure (CP) aft? - correct answerMake the
rocket shorter, use larger fins, increase the number of fins
The definition of coefficient of drag (Cd) is: - correct answerA dimensionless number dependent
on the rocket configuration, Mach number and angle of attack
What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound? -
correct answerThe Cd increases.
For a subsonic rocket, what factors most greatly affect the coefficient of drag (Cd)? - correct
answerSpeed, airframe dimensions, nosecone shape and fin shape.
What effect does a boat tail have on a subsonic rocket's coefficient of drag (Cd)? - correct
answerIt decreases the Cd by reducing the base drag.
The flight of a high power rocket can be separated into three portions; they are: - correct
answerPowered flight, un-powered ascent and descent.
