AERA Component Inspection & Quality Control 2

Question 1

When checking a crankshaft for straightness, which measuring instrument is used in conjunction with V-blocks?

Accepted Answer

Dial indicator

Answer

A dial indicator mounted over the crankshaft journal while it rests in V-blocks reveals runout (bend) in the shaft.

Question 2

Which condition is indicated when a cylinder bore shows greater wear at the top of the ring travel than at the bottom?

Accepted Answer

Taper

Answer

Taper occurs because combustion pressure forces the rings hardest against the bore at the top of the stroke, causing more wear there.

Question 3

A main bearing bore that measures larger on one axis than on the perpendicular axis is described as:

Accepted Answer

Out-of-round

Answer

Out-of-round (also called ovality) means the bore is not a true circle, with differing diameters at 90-degree angles.

Question 4

Magna-flux (magnetic particle) inspection is primarily used to detect which type of defect in engine components?

Accepted Answer

Surface or near-surface cracks in ferrous metals

Answer

Magnetic particle inspection reveals surface and subsurface cracks in ferrous (iron-based) components by highlighting particle accumulation at flux leakage points.

Question 5

What is the maximum allowable out-of-round condition for most production engine cylinder bores before reconditioning is required?

Accepted Answer

0.001 in (0.025 mm)

Answer

Most manufacturers specify a maximum out-of-round of 0.001 in (0.025 mm); beyond this, boring or honing to restore roundness is required.

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

(AERA) Automotive Engine Rebuilders Association Certification Practice Test

AERA Component Inspection & Quality Control 2