NAR HPR Ignition Systems & Launch Controllers 3

Question 1

What does the 'arm' switch on a launch controller do in the ignition sequence?

Accepted Answer

It enables the high-current firing circuit so the launch button can complete ignition

Answer

The arm switch enables the firing circuit, making the system live so that pressing the launch button can complete the circuit and deliver current to the igniter.

Question 2

What should be done with the launch controller leads during the mandatory wait period following a misfire?

Accepted Answer

Leave them connected while all personnel remain at the required safe distance

Answer

During the mandatory 60-second wait, leads remain connected and all personnel stay at safe distance; no approach or changes to the system are permitted until the wait elapses.

Question 3

What is the purpose of a nozzle plug used with high-power rocketry motors?

Accepted Answer

To protect the propellant grain from moisture and debris until the igniter is installed

Answer

Nozzle plugs protect the propellant grain from moisture and contamination during storage and transport; they are removed when the igniter is installed at the pad.

Question 4

At what stage of launch preparation should the launch controller leads be physically connected to the igniter?

Accepted Answer

At the pad, as the final step immediately before the RSO arms the system

Answer

Connecting launch leads is the final preparation step before arming, minimizing the time the igniter is wired to the firing circuit and reducing risk.

Question 5

Why is it important to verify that no RF transmitters are active near a rocket on the launch pad?

Accepted Answer

RF energy can induce current in igniter leads and potentially cause inadvertent ignition

Answer

RF energy from nearby radios or transmitters can induce electrical current in igniter lead wires, potentially triggering inadvertent ignition of the motor.

(NAR HPR) NAR High-Power Rocketry Certification Practice Test

(NAR HPR) NAR High-Power Rocketry Certification Practice Test

NAR HPR Ignition Systems & Launch Controllers 3