Practice Test Geeks(NAR HPR) NAR High-Power Rocketry Certification Practice Test
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Ignition Systems & Launch Controllers Flashcards

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  1. What is the primary safety purpose of a continuity check performed before arming the launch controller?

    Answer: To confirm the electrical circuit is complete and the igniter will receive firing current

    A continuity check confirms the firing circuit is complete, ensuring the igniter will receive adequate current when the controller is activated.

  2. When should igniters be installed in the motor during launch preparation according to NAR safety rules?

    Answer: As the final step after the rocket is positioned on the pad and ready for the arming sequence

    NAR safety rules require igniters to be installed as the last step after the rocket is on the pad to minimize the risk of accidental ignition during handling.

  3. What does the 'no-fire current' specification of a pyrotechnic igniter indicate?

    Answer: The maximum current that can flow through the igniter without causing ignition

    The no-fire current is the maximum current that can safely flow through an igniter without firing it, which is critical for safe continuity testing.

  4. What is the minimum wait time required before approaching a rocket that has experienced a misfire?

    Answer: 60 seconds

    NAR rules require a minimum 60-second wait after a misfire before anyone approaches the rocket, allowing sufficient time for any delayed ignition to occur safely.

  5. Why should igniters be 'shunted' (short-circuited across their leads) during transport and storage?

    Answer: To prevent accidental ignition from stray electrical currents or static electricity

    Shunting an igniter by connecting its leads together prevents accidental firing from stray currents, static electricity, or induced RF energy.

  6. What safety feature is required on all NAR-compliant launch controllers?

    Answer: A removable safety key or interlock that prevents arming

    NAR rules require launch controllers to have a safety interlock (typically a removable key) that must be inserted to arm the system, preventing accidental firing.

  7. What type of electrical current is used to fire pyrotechnic igniters in high-power rocketry?

    Answer: Direct current (DC) from a battery source

    Pyrotechnic igniters in rocketry are fired using direct current (DC) from batteries, which provides reliable and controlled current delivery.

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