UHC Exam (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+)

What are the 4 components of our 2.75" rockets? - Fuze, Warhead, Motor, Nozzle/Fin Assembly What are the max ranges and max effective ranges of the GAU-21, GAU-17, and M240D? Tracer Burnout for each? - GAU-21: 6500, 1850, 1100m; GAU-17: 3500, 1100, 900m; M240D: 3725, 1200, 900m What are the differences between the two fuzes authorized for the M151? - M423: Distance to arm = 43-92m; M427 = 243-381 (used for higher speed aircraft) Describe the M257 and M278. - M257 (overt illumination): 19deg pitch, 3500m/1800' HAL, 120s burn. M278 (IR illumination): 26deg pitch, 3000m/2500' HAL, 180s burn, 0.7-1.1 micron (peak @ 0.8). Both = 9.5s to drogue chute, 13.5s to flare, 13-15fps fall. Rule of thumb for correcting wind drift when shooting illum - 10kt crosswind = 5deg hdg into wind (300m) How far will a spent illum rocket motor travel? - 700-1000m beyond the target. What range of IR energy is produced by the M278 illumination rocket warhead? - 0.7-1.1 micron (peak @ 0.8) List the danger close numbers for the M151 2.75" rockets, and M229 2.75" rockets for 300, 800, and 1500m. List danger close numbers for Flechette rockets and APKWS. - M151/M229 = 110, 135, 170m. Flechette = 235m @1000m. APKWS = 105m @ all distances. List the danger close numbers for 20mm, HF, and JAGM - 20mm = 45, 95, 155m @ 300, 800, 1500m. AGM-114 FA/K/L/M/N(4/6)/P(2A) = 115. AGM-114R = 130. AGM-114R2 = 145. The Mk-66 series motor produces an average thrust of _____ lbs of thrust for a duration of ____ seconds and weighs approximately _____ lbs. - 1415lbs / 1.1s / 13.65lbs The M113A fuze is an acceleration-deceleration (BD) fuze permanently installed in the ______ and the ______ Flechette warheads. Fuze functioning at motor burnout provides Flechette expulsion. The fuze requires ____ Gs in order to arm and fires when deceleration reaches approximately ____ Gs. Air travel to arm is approximately ______ meters with the fuze being completely armed in about ____ seconds - WDU-4A/A. My 149 MOD 0. 17.5Gs. 11Gs. 400-600m. 1.2s WDU-4A/A flechette contains ______ x ____ grain Flechettes whereas the Mk 149 MOD 0 dispenses ______ x ____ grain flechettes. - 2205x20grain; 1179x60grain What are the allowable PRF Codes for an APKWS? - What warhead/fuze combinations are allowed for use in APKWS? - M423 / M151; M423 / M282; M423 / M229; WTU-1B