NAR Level 2 Section E - Rocket Motor Designations Certification Test

Assuming that each motor has the full allowable impulse, how many "H" motors have the same total impulse as a single "J" motor?

D: 4

An "H" motor has a maximum allowable total impulse of 320.00 Newton-seconds and a "J" motor has a maximum total impulse of 1280.00 Newton-seconds thus it takes 4 "H's" to equal 1 "J".