TRA Advanced Study Guide - Technical Questions part 2

What is the oxidizer most commonly used in a commercial hybrid rocket motor?

• N2O

• N2O4

• NO2

For a rocket with a much less than 10:1 “length to diameter” (L/D) ratio, such as spools and pyramids, what type of drag contributes significantly to stability and makes it possible to fly without much, if any, nose weight?

• Nose drag

• Base drag

• Surface drag

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When doing an air-start of an L class motor, which of the following would be considered the safest configuration?

• A single computer driving a single initiator

• Two computers each driving one initiator with a 0.5 second delay between firing the two initiators

• Two computers each driving one initiator with no delay between them

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A rocket with a motor cluster consisting of a central composite motor and four black powder motors, using five identical igniters:

• Will result in all motors starting about the same time

• Will result in the composite motor starting first followed by the black powder motors

• Will result in the black powder motors starting first followed by the central composite motor

What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?

• Nothing

• The rocket may become more stable

• The rocket may become less stable

In general terms, the specific impulse of a rocket motor is:

• The total thrust force of a motor throughout its action time

• The total impulse divided by a unit weight of propellant

• Inversely related to the diameter and length of the propellant grain

In general terms, the total impulse of a rocket motor can be described as:

• The product of the average motor thrust and burn time

• The product of the propellant weight and burn time

• The product of the propellant weight and the motor thrust

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The average thrust of a rocket motor is 100 Newtons, and the burn time is 4 seconds. What is the total impulse?

• 25 Newton-seconds

• 400 Newton-seconds

• 400 Newtons

Which of the motors listed below has the highest total impulse?

• J200

• J400

• K200

Which of the motors listed below has the highest average thrust?

• J200

• J400

• K200

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