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LADWP Electrical Mechanic–Test Technician Exam, Los
Angeles Department of Water and Power, Academic Year
2026-2027 Exam Questions with Verified Correct Detailed
Answers Revised and Updated
,Page 2 of 18
Introduction
This document contains 150 electrical mechanic–test
technician exam questions with stated correct answers and
explanations. Topics include electrical fundamentals, AC/DC
circuits, Ohm’s law, electrical measuring instruments, motors,
transformers, semiconductors, capacitors, magnetic fields,
three-phase systems, switches, wiring, and basic mechanical
tools.
Exam Questions and Answers
75.When bending a 2-inch diameter conduit, the correct tool
to use is a .-
--- correct precise answer --- Hydraulic bender
76.The best instrument to measure the small gap between
relay contacts is...--- correct precise answer --- Feeler gage
77.A possible result of mounting a 40 ampere fuse in a fuse
box for a circuit requiring a 20 ampere fuse is that the 40
ampere fuse may...--- correct precise answer --- Cause serious
damage to the circuit from overload
78.Capacitors--- correct precise answer --- have the ability to
store and discharge electrical potential energy
79.Resistors--- correct precise answer --- Devices that apply
resistance to a circuit to manage current. They are rated in
, Page 3 of 18
ohms and have a color code on them to indicate their value,
tolerance, and sometimes quality.
80.RC circuit--- correct precise answer --- a circuit containing
a series combination of a resistor and a capacitor. Used for
energy storage, filtering, timing, and signal conditioning. Only
for DC!
81.What type of current flows through a transformer?---
correct precise answer --- AC
82.Inverter--- correct precise answer --- A device that
converts DC to AC.
83.Joule--- correct precise answer --- 1 watt-second
84.milli (m)--- correct precise answer --- 10^-3 (0.001)
85.Mega--- correct precise answer --- 10^6 (1,000,000)
86.Giga--- correct precise answer --- G, 10^9, (1,000,000,000)
87.Micro--- correct precise answer --- 10^-6 (0.000001)
88.Adding branches to a parallel circuit will do what?---
correct precise answer --- decreases the overall resistance
and increases the total current.
89.SOH CAH TOA triangle--- correct precise answer --- SIN
(Opposite/Hypotenuse) COS (Adjacent/Hypotenuse) TAN
(Opposite/Ad-jacent)
90.Pathagorean Theorem--- correct precise answer ---
a²+b²=c² (only for right triangles)
91.Diagonal Pliers ("Dikes")--- correct precise answer ---
intended to cut pieces of wire or small metal hardware like
pin
92.What's the angle you should hold a wrench?--- correct
precise answer --- 15 degrees
LADWP Electrical Mechanic–Test Technician Exam, Los
Angeles Department of Water and Power, Academic Year
2026-2027 Exam Questions with Verified Correct Detailed
Answers Revised and Updated
,Page 2 of 18
Introduction
This document contains 150 electrical mechanic–test
technician exam questions with stated correct answers and
explanations. Topics include electrical fundamentals, AC/DC
circuits, Ohm’s law, electrical measuring instruments, motors,
transformers, semiconductors, capacitors, magnetic fields,
three-phase systems, switches, wiring, and basic mechanical
tools.
Exam Questions and Answers
75.When bending a 2-inch diameter conduit, the correct tool
to use is a .-
--- correct precise answer --- Hydraulic bender
76.The best instrument to measure the small gap between
relay contacts is...--- correct precise answer --- Feeler gage
77.A possible result of mounting a 40 ampere fuse in a fuse
box for a circuit requiring a 20 ampere fuse is that the 40
ampere fuse may...--- correct precise answer --- Cause serious
damage to the circuit from overload
78.Capacitors--- correct precise answer --- have the ability to
store and discharge electrical potential energy
79.Resistors--- correct precise answer --- Devices that apply
resistance to a circuit to manage current. They are rated in
, Page 3 of 18
ohms and have a color code on them to indicate their value,
tolerance, and sometimes quality.
80.RC circuit--- correct precise answer --- a circuit containing
a series combination of a resistor and a capacitor. Used for
energy storage, filtering, timing, and signal conditioning. Only
for DC!
81.What type of current flows through a transformer?---
correct precise answer --- AC
82.Inverter--- correct precise answer --- A device that
converts DC to AC.
83.Joule--- correct precise answer --- 1 watt-second
84.milli (m)--- correct precise answer --- 10^-3 (0.001)
85.Mega--- correct precise answer --- 10^6 (1,000,000)
86.Giga--- correct precise answer --- G, 10^9, (1,000,000,000)
87.Micro--- correct precise answer --- 10^-6 (0.000001)
88.Adding branches to a parallel circuit will do what?---
correct precise answer --- decreases the overall resistance
and increases the total current.
89.SOH CAH TOA triangle--- correct precise answer --- SIN
(Opposite/Hypotenuse) COS (Adjacent/Hypotenuse) TAN
(Opposite/Ad-jacent)
90.Pathagorean Theorem--- correct precise answer ---
a²+b²=c² (only for right triangles)
91.Diagonal Pliers ("Dikes")--- correct precise answer ---
intended to cut pieces of wire or small metal hardware like
pin
92.What's the angle you should hold a wrench?--- correct
precise answer --- 15 degrees
