Free AMIE Practice Questions

Question 1

A thick boss is fed through a thin connecting wall. At 4 s, an increase in packing pressure raises pressure near the gate but produces no pressure response in the boss. The gate remains open until 7 s. The connecting wall's frozen-layer fraction reaches 1.0 at 3 s, while the boss core remains molten. Longer holding increases near-gate overpacking without reducing the boss sink. What explains this behavior?

Accepted Answer

The connecting wall seals the pressure path to the boss before the gate itself freezes.

Answer

The gate seals too early for holding pressure to reach the remote boss.

Answer

Excessive packing of the boss causes its molten core to contract more than the connecting wall.

Answer

Trapped gas blocks pressure transmission through a connecting wall that remains open to melt flow.

Question 2

A 2 mm housing wall joins a 12 mm mounting lug through an abrupt transition. The engineering question depends on flow turning through the lug's thickness. A Dual Domain model has closed skins and consistent normals, but opposite-surface correspondence is ambiguous within the lug. Refining the surface triangles produces little change in inlet pressure. Which modeling decision addresses the remaining risk?

Accepted Answer

Use a suitably resolved 3D tetrahedral model to represent the lug's volumetric flow.

Answer

Retain Dual Domain because pressure convergence confirms the lug model's adequacy.

Answer

Use a midplane model with the lug's full thickness assigned to its midsurface elements.

Answer

Retain Dual Domain and refine its surface triangles until through-thickness flow is resolved.

Question 3

Relocating the gate on a glass-filled bracket changes the Moldflow flow-front meeting angle at a loaded lug from 95 degrees to 160 degrees. The junction remains within the lug, and the flow-front temperature is within the material's processing range. A design review proposes removing the junction from the structural-risk assessment. What does the angle change actually establish?

Accepted Answer

The junction is now a meld line; its load-bearing performance still requires verification.

Answer

The junction remains a weld line; meld lines require smaller meeting angles.

Answer

The junction is a meld line, so the unwelded material strength can be assigned without further assessment.

Answer

The junction has become weaker because a larger meeting angle necessarily produces less molecular intermixing.

Question 4

A four-cavity mold is being assigned to a 700 kN press. At the instant of maximum mold-opening load, each cavity has 3,500 mm^2 of pressure-loaded projected area and a projected-area-weighted mean pressure of 38 MPa. The cold runner contributes another 1,500 mm^2 at a projected-area-weighted mean pressure of 60 MPa. Nozzle pressure at that instant is 80 MPa. The project requires a clamp-force factor of 1.20 applied to the opening load, and the molding process must remain unchanged. Which release decision is justified?

Accepted Answer

Do not release this setup on the 700 kN press; the required clamp capacity is approximately 746 kN.

Answer

Release the setup on the 700 kN press; applying the required factor to the four cavities gives approximately 638 kN.

Answer

Release the 700 kN press; the cavity-and-runner opening load is approximately 622 kN.

Answer

Require a press rated for at least 1,488 kN; nozzle pressure must be applied over the entire cavity and runner area.

Question 5

At a critical region of a fiber-filled molding, the normalized second-order fiber-orientation tensor has diagonal components a11 = 0.82, a22 = 0.13, and a33 = 0.05; all off-diagonal components are zero. The 1, 2, and 3 directions correspond to X, Y, and Z. Which statement can be supported by this result alone?

Accepted Answer

The fiber population has a strong preferred alignment along the X-axis.

Answer

Eighty-two percent of the fibers are exactly parallel to the X-axis.

Answer

X-direction shrinkage is 18 percent of the corresponding unfilled resin's shrinkage.

Answer

X-direction stiffness is 82 percent of the material's fully aligned longitudinal modulus.

Question 6

Two stabilized trials are run on the same cooling circuit. In the first, coolant mass flow is 0.12 kg/s and the outlet is 2 degrees C warmer than the inlet. After a valve adjustment, mass flow is 0.04 kg/s and the temperature rise is 5 degrees C. Use a coolant specific heat of 4,200 J/(kg*K) for both trials and neglect heat exchange with the surroundings between the temperature measurement points. An engineer cites the larger temperature rise as evidence of better cooling. Which assessment correctly uses the circuit's heat balance?

Accepted Answer

Heat removal decreased from 1.01 to 0.84 kW, so the larger temperature rise does not show improved extraction.

Answer

Heat removal increased from 1.01 to 2.52 kW, so the larger temperature rise confirms improved extraction.

Answer

Heat removal increased from 0.34 to 0.84 kW, so the lower flow rate improved extraction in this circuit.

Answer

Heat removal decreased from 1.01 to 0.34 kW, so extraction fell in direct proportion to the mass-flow reduction.

Question 7

A validation report for a glass-filled nylon connector compares a dry-part warpage prediction with dimensions measured after moisture conditioning. Both datasets use the same temperature and datum alignment. The author plans to adjust the material's shrinkage data to remove the discrepancy. Retained dry specimens from the same molding run are available. Which action should precede that adjustment?

Accepted Answer

Compare the prediction with the retained dry specimens under matching measurement conditions.

Answer

Fit the shrinkage data to the conditioned dimensions while retaining the dry-part assumptions in the analysis.

Answer

Use best-fit registration to remove conditioning-related dimensional changes.

Answer

Reject the material dataset and require complete recharacterization before conducting further dimensional comparisons.

Question 8

The injection-pressure trace for a thin-wall cover shows a sharp spike just before velocity-to-pressure transfer. Filling results place completion of cavity filling before the transfer event, and the screw continues at commanded filling velocity during that interval. Pressure settles promptly to the holding setpoint after transfer. The machine is not pressure-limited before the spike. Which adjustment most directly addresses its cause?

Accepted Answer

Advance velocity-to-pressure transfer so velocity-controlled injection does not continue into a full cavity.

Answer

Reduce the subsequent holding-pressure setpoint while retaining the current transfer trigger.

Answer

Increase the injection-pressure limit to preserve the commanded velocity through the current transfer point.

Answer

Lengthen the holding stage so pressure has more time to stabilize after the transfer event.

Question 9

A glass-filled housing twists clockwise with one gate arrangement and counterclockwise with another. The corresponding principal fiber directions rotate through the ribs. Local packing-pressure histories, volumetric-shrinkage distributions, and through-thickness temperature histories in the critical regions remain closely matched. For this grade, measured shrinkage is substantially lower along the fiber direction than transverse to it. Which mechanism should guide the next gate comparison?

Accepted Answer

Orientation-dependent contraction caused by the changed fiber alignment through the ribs.

Answer

Differences in core-to-cavity thermal histories across the critical ribs.

Answer

Packing-driven shrinkage differences between the last-to-fill ribs and the gate region.

Answer

Isotropic contraction resulting from a change in the grade's mean volumetric shrinkage.

Question 10

An engineer changes only the packing-pressure profile, completes a new Fill+Pack analysis, and confirms that the existing cooling solution remains applicable. Geometry, mesh, material, and constraints are unchanged. The project still contains a Warp result calculated from the earlier pressure history. Before comparing flange shape, what is the minimum necessary analysis update?

Accepted Answer

Run a new Warp analysis driven by the updated filling and packing history.

Answer

Remesh the part and repeat the entire cooling, filling, packing, and warpage sequence.

Answer

Repeat the entire filling stage while retaining the earlier packing and warpage results for the revised process.

Answer

Reuse Warp because neither material nor geometry has changed.

Free AMIE Practice Questions

Domain 1: Theoretical 20% of exam

Question 1

Question 2

Question 3

Domain 2: Practical 60% of exam

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Domain 3: Report 20% of exam

Question 10

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