CEM Technical Skills & Application 5

Question 1

A CEM is evaluating whether to rebuild or replace a failed diesel engine. The rebuild quote is 65% of the replacement cost. What additional factor is MOST critical to this decision?

Accepted Answer

Remaining service life of the machine relative to rebuilt engine warranty

Answer

If the machine has limited remaining economic life, investing 65% of a new engine cost in a rebuild may not be recoverable before the machine is retired.

Question 2

When calibrating a motor grader blade cross-slope using an indicate system, which sensor input provides the primary cross-slope reference?

Accepted Answer

An in-cab pendulum or MEMS-based slope sensor mounted perpendicular to the blade

Answer

Cross-slope control relies on an accelerometer or MEMS slope sensor measuring blade tilt angle relative to gravity perpendicular to the direction of travel.

Question 3

Which test BEST determines whether an engine's turbocharger is delivering adequate boost pressure for its rated output?

Accepted Answer

Recording boost pressure under load with a calibrated gauge or scan tool and comparing to OEM specification

Answer

Comparing measured boost pressure against the OEM specification under rated load is the definitive test for turbocharger performance adequacy.

Question 4

A CEM finds that a compactor's vibratory system runs at only 75% of the specified frequency. The most likely cause in an eccentric-weight vibratory system is:

Accepted Answer

Hydraulic motor case drain restriction causing over-pressurization and speed reduction

Answer

A restricted case drain line increases back-pressure on the hydraulic motor, acting as a braking force that reduces shaft speed below specification.

Question 5

Which ANSI/SAE standard governs the rated operating capacity (ROC) of compact construction equipment such as skid steer loaders?

Accepted Answer

SAE J818 / ANSI/ITSDF B56 rated load at 35% of tipping load

Answer

SAE J818 establishes that the ROC for skid steer loaders is 35% of the static tipping load, providing the rated capacity operators and planners must not exceed.

(CEM) Certified Equipment Manager Practice Test

(CEM) Certified Equipment Manager Practice Test

CEM Technical Skills & Application 5