NCCER 26404 BASIC ELECTRICAL THEORY 2026 LATEST QUESTIONS AND ANSWERS| ACE YOUR GRADES.

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NCCER 26404 BASIC ELECTRICAL
THEORY 2026 LATEST QUESTIONS AND
ANSWERS| ACE YOUR GRADES.

Silicon diodes are commonly used for constructing _____
Rectifiers
Germainium diodes are mainly used in
Signal and control circuits
A forward bias will show a (low/high) resistance?
Low
A reverse bias will show a (low/high) resistance?
High
The process of giving off light by applying an electrical
source of energy is called
electroluminescence
A _____ resistor must be connected in series with the LED
Current-limiting
A transistor is made by joining ____ layers of semiconductor
material
3
A transistor has __ PN junctions
Two

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Control voltages are applied to the center layer of a
transistor, known as the
Base
The direction of the emitter arrow points (away from/toward)
the base in the PNP transistor
Towards
The direction of the emitter arrow points (away from/toward)
the base in the NPN transistor
Away from
A transistor that controls the flow of current through it with
an electric field.
Field effect transistor (FET)
Name the 3 types of thyristors
SCRs, diacs, and triacs
All thyristors will act as an _____ circuit until a triggering
current is applied
Open
The SCR is made of _____ layers of semiconductor material
Four
A diac will conduct on _____ _____ of the AC waveform
Either half
1 triac equals __ SCRs
2
A _____ is a three layer diode