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DOE-STD-1170-2003
i.
Describe the differences in construction between a shunt-wound and a
series-wound direct current generator with respect to the relationship between the
field and the armature.
j.
Describe the relationship between the shunt and series fields for
cumulatively-compounded and differentially-compounded direct current
generators.
k.
Describe the voltage-versus-current characteristics for a flat-compounded, over-
compounded, and under-compounded direct current generator.
3.
Electrical systems personnel shall have a working level knowledge of direct
current (DC) motors.
Supporting Knowledge and/or Skills
a.
Describe the basic construction and operation of the following four types of direct
current motors:
Shunt
Separately excited
Compound-wound
Series
b.
State the function of torque in a direct current motor and how it is developed.
c.
Describe the function of counter-electromotive force (CEMF) and how it is
developed in a direct current motor.
d.
Describe the relationship between field current and magnetic field size in a direct
current motor.
e.
Describe how to adjust the speed of a direct current motor.
f.
Describe the relationship between armature current and torque produced in a
direct current motor.
g.
Describe the torque-versus-speed characteristics for a shunt-wound and a
series-wound direct current motor.
h.
Explain why starting resistors may be necessary for large direct current motors.
4.
Electrical systems personnel shall demonstrate a working level knowledge of
battery construction, voltage production, and hazards.
Supporting Knowledge and/or Skills
a.
Using a cutaway drawing of a simple multi-cell storage battery, identify the
following components and discuss their function:
Positive terminal
Negative terminal
7


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