LADWP ELECTRICAL MECHANIC
ACTUAL TEST TECHNICIAN EXAM
QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE
2026/2027 GRADED A+ .
, 1. Of the following electrical devices, the one that is NOT normally used in direct current electrical circuits is a ....
A. Circuit breaker
B. Double-pole switch
C. Transformer
D. Inverter ✔✔ CORRECT ANSWER C. Transformer
Transformers do not use direct current (DC). Transformers work on alternating current (AC), which is electrical current
that flows in a single direction. A transformer's principle is based on electromagnetic induction, which requires a voltage source that changes with time. A DC supply is
unidirectional, so the transformer cannot work. If the input terminals of a transformer are connected to a DC voltage, the transformer usually burns.
2. Of the following motors, the one that does NOT have brushes is the
motor.
A. DC shunt
B. DC series
C. Squirrel cage induction
D. Compound ✔✔ CORRECT ANSWER C. Squirrel cage induction. Cheap and easy to install - squirrel cage induction motors do not contain brushes, slip
rings, commutators, permanent magnets, position sensors, or other components that increase their overall cost. Their simple construction ensures they are generally easy to
install and maintain.
3. Of the following materials, the one that is COMMONLY used as an electric heating element in an electric
heater is...
A. Zinc
B. Brass
C. Terne plate
D. Nichrome ✔✔ CORRECT ANSWER D. Nichrome. Most heating elements use Nichrome 80/20, which is 80% nickel and 20% chromium. Nichrome is
ideal because it has high resistance and forms a chromium oxide layer when heated for the first time.
4. A bolt is specified as 1/4-28 means the... ✔✔ CORRECT ANSWER Bolt is 1/4 inch in diameter and has 28 threads per inch
5. Name 3 basic components of the atom ✔✔ CORRECT ANSWER ✔✔ CORRECT ANSWER Proton, neutron, electron
6. Two opposing forces hold the electron in place. They are force and
attraction. ✔✔ CORRECT ANSWER Centrifugal force & electrical attraction
ACTUAL TEST TECHNICIAN EXAM
QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE
2026/2027 GRADED A+ .
, 1. Of the following electrical devices, the one that is NOT normally used in direct current electrical circuits is a ....
A. Circuit breaker
B. Double-pole switch
C. Transformer
D. Inverter ✔✔ CORRECT ANSWER C. Transformer
Transformers do not use direct current (DC). Transformers work on alternating current (AC), which is electrical current
that flows in a single direction. A transformer's principle is based on electromagnetic induction, which requires a voltage source that changes with time. A DC supply is
unidirectional, so the transformer cannot work. If the input terminals of a transformer are connected to a DC voltage, the transformer usually burns.
2. Of the following motors, the one that does NOT have brushes is the
motor.
A. DC shunt
B. DC series
C. Squirrel cage induction
D. Compound ✔✔ CORRECT ANSWER C. Squirrel cage induction. Cheap and easy to install - squirrel cage induction motors do not contain brushes, slip
rings, commutators, permanent magnets, position sensors, or other components that increase their overall cost. Their simple construction ensures they are generally easy to
install and maintain.
3. Of the following materials, the one that is COMMONLY used as an electric heating element in an electric
heater is...
A. Zinc
B. Brass
C. Terne plate
D. Nichrome ✔✔ CORRECT ANSWER D. Nichrome. Most heating elements use Nichrome 80/20, which is 80% nickel and 20% chromium. Nichrome is
ideal because it has high resistance and forms a chromium oxide layer when heated for the first time.
4. A bolt is specified as 1/4-28 means the... ✔✔ CORRECT ANSWER Bolt is 1/4 inch in diameter and has 28 threads per inch
5. Name 3 basic components of the atom ✔✔ CORRECT ANSWER ✔✔ CORRECT ANSWER Proton, neutron, electron
6. Two opposing forces hold the electron in place. They are force and
attraction. ✔✔ CORRECT ANSWER Centrifugal force & electrical attraction
