NAR HPR Ignition Systems & Launch Controllers

Question 1

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

Accepted Answer

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

Answer

To verify the igniter is properly seated in the motor nozzle

Answer

To measure the output voltage of the launch controller battery

Answer

To ensure the rocket is pointing vertically on the launch rail

Question 2

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

Accepted Answer

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

Answer

When building the motor at home the night before

Answer

Immediately after arriving at the launch site

Answer

After the motor is loaded but before the rocket goes to the pad

Question 3

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

Accepted Answer

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

Answer

The current at which the igniter is guaranteed to fire

Answer

The minimum battery voltage required for the launch controller

Answer

The current level used during a continuity check

Question 4

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

Accepted Answer

60 seconds

Answer

30 seconds

Answer

45 seconds

Answer

90 seconds

Question 5

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

Accepted Answer

To prevent accidental ignition from stray electrical currents or static electricity

Answer

To keep them moist and prevent chemical degradation

Answer

To allow continuity testing without a dedicated launch controller

Answer

To maintain calibrated resistance levels during storage

Question 6

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

Accepted Answer

A removable safety key or interlock that prevents arming

Answer

A digital display showing real-time battery voltage

Answer

A built-in wireless remote firing capability

Answer

A built-in continuity resistance meter display

Question 7

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

Accepted Answer

Direct current (DC) from a battery source

Answer

Alternating current (AC) from a transformer

Answer

High-frequency pulsed current

Answer

Static discharge current from a capacitor bank