SUGGESTED QUALIFYING PROCEDURES FOR
REFERENCE DA PAM 20-31
Personnel selected for testing should have a standard score of 100 In aptitude area GM of the Army Classification
It Is recommended that the test questions In Section I and performance test in Section III be used for all generator
sets and motor generators.
The written evaluation test measures the potential operator's technical knowledge The passing grade is 80 percent.
The test consists of 25 questions of which the first 12 are true-false questions and the balance require written (brief)
answers. Each question has a value of four points. This test should represent 40 percent of the testing procedures.
Applicants failing this test should not be permitted to proceed to the performance test, until the student has completed a
retraining period on the technical aspects of the equipment. Answers to the questions in Section 1 are provided in
The performance test measures the student's performance ability on the specific equipment for which a Standard
Form 46 is sought. The passing grade for this test is 80 percent, and consists of the preoperational, operational, and
postoperational checks. During this performance test the student should be required to use the pertinent operator's
manual. This test represents the remaining 60 percent of the testing procedures. The section for air-cooled engines has
25 items to be checked during the proportional, operational, and postoperational check period. Four points will be
allowed for each item correctly performed. For liquid cooled and gas turbine engines there are 40 items to be checked.
Two and one-half points will be allowed for each correct answer. The motor generator section has 25 items to be
checked. Each correct answer is worth four points. Section III provides an Instructor's checklist that should be used to
grade the student during the performance test.
TEST QUESTIONS FOR GENERATORS
Answer these questions by "True" or "False"
A direct current (DC) generator can be used to charge vehicular batteries.
Both alternating current (AC) and direct current (DC) generators may be used for providing power for light
All generator sets should be grounded by a ground-driven metal rod prior to operation.
When connecting the wiring of any circuit to a generator, the generator should not be operating.
The commutator or slip rings on generator sets ,should be polished at all times.
When changing brushes on a generator, the new brushes must fit the commutator and slip rings as, precisely
Stop engine immediately after load operation to prevent excess fuel accumulation In engine combustion
You must put oil in the gasoline for all aircooled engines.
After two alternators have been paralleled, the load should be divided between them in proportion to their
ratings. That is, the larger the generator, the larger share of the load It should carry.
10. Generator sets should always be operated on a nearly level surface to assure proper engine lubrication.
11. A three-phase 15 KW generator will deliver 15 KW on each phase.
12. If synchronizing lights vary alternately, one bright when the other is dark, vary the speed of one or the other
set until the two lights are either bright or dark together.
Change 2 B-1