LADWP Electrical Craft Helper Ultimate Exam
Questions And Answers Practice Questions with
Solutions Newest | Already Graded A+.
SECTION 1: READING COMPREHENSION
Directions: Read the passage carefully and choose the best answer based only on the text
provided.*
PASSAGE A:
"Insulators are materials that resist the flow of electric current. They are used to separate
conductors from each other and from supporting structures. Common insulators include
glass, rubber, plastic, and porcelain. The effectiveness of an insulator is measured by its
dielectric strength, which is the maximum electric field it can withstand without breaking
down. Over time, environmental factors such as moisture and contamination can reduce
the dielectric strength of an insulator, leading to leakage current."
1. What is the primary purpose of an insulator as described in the passage?
A) To conduct electricity efficiently.
B) To resist the flow of electric current and separate conductors.
C) To increase the voltage of a circuit.
D) To store electrical charge.
Correct Answer: B
Explanation: The very first sentence states, "Insulators are materials that resist the flow
of electric current. They are used to separate conductors..." Option B is a direct paraphrase
, of this. A, C, and D are descriptions of conductors, transformers, and capacitors,
respectively.
2. According to the passage, what factors can degrade the performance of an
insulator?
A) High frequency and low resistance.
B) Moisture and contamination.
C) High conductivity and low dielectric strength.
D) Overheating and high voltage only.
Correct Answer: B
Explanation: The last sentence explicitly states: "...environmental factors such as
moisture and contamination can reduce the dielectric strength..." The passage does not
mention frequency, overheating, or high voltage as degrading factors.
3. The term "dielectric strength" refers to:
A) The resistance to heat.
B) The maximum electric field an insulator can withstand.
C) The weight of the insulating material.
D) The color of the insulator.
Correct Answer: B
Explanation: The passage defines it clearly: "...dielectric strength, which is the maximum
electric field it can withstand without breaking down."
PASSAGE B:
"LADWP requires all personnel working on or near energized equipment to wear
appropriate Personal Protective Equipment (PPE). This includes rubber insulating gloves
with leather protectors, hard hats, and flame-resistant clothing. Before each use, gloves
, must be air-tested to check for punctures. If a puncture is found, the gloves must be
immediately removed from service and retested by a certified lab."
4. What must be done to rubber gloves before each use?
A) Washed with soap and water.
B) Air-tested for punctures.
C) Stored in direct sunlight.
D) Rolled up tightly.
Correct Answer: B
Explanation: The text explicitly commands: "Before each use, gloves must be air-tested to
check for punctures." Washing, sunlight, and rolling are not mentioned.
5. What is the consequence of finding a puncture in a glove during the test?
A) It can still be used for low-voltage work.
B) It must be patched immediately.
C) It must be removed from service and sent to a lab.
D) It should be double-gloved.
Correct Answer: C
Explanation: The passage states: "If a puncture is found, the gloves must be immediately
removed from service and retested by a certified lab." Patching or double-gloving is not
permitted per LADWP rules.
SECTION 2: MATHEMATICAL REASONING & ALGEBRA
Directions: Solve each problem. Show your work step-by-step. You may use a calculator on
the real exam, but practice these manually.
, 6. A crew has 1,500 feet of cable. They use 3/5 of it on Monday and 1/4 of
the remaining on Tuesday. How many feet are left?
A) 450
B) 375
C) 300
D) 225
Correct Answer: A
Step-by-Step Work:
Monday usage: 1,500 × (3/5) = 1,500 × 0.6 = 900 ft used.
Remaining after Monday: 1,500 – 900 = 600 ft.
Tuesday usage: 600 × (1/4) = 150 ft used.
Remaining total: 600 – 150 = 450 ft.
7. Solve for x: 3(x - 4) = 2x + 7
A) 5
B) 19
C) 11
D) 23
Correct Answer: B
Step-by-Step Work:
Distribute the left side: 3x – 12 = 2x + 7
Subtract 2x from both sides: (3x – 2x) – 12 = 7 → x – 12 = 7
Add 12 to both sides: x = 19
8. A transformer has a primary voltage of 4,800 volts and a secondary voltage of
240 volts. What is the turns ratio (Primary : Secondary)?
A) 20:1
B) 1:20
Questions And Answers Practice Questions with
Solutions Newest | Already Graded A+.
SECTION 1: READING COMPREHENSION
Directions: Read the passage carefully and choose the best answer based only on the text
provided.*
PASSAGE A:
"Insulators are materials that resist the flow of electric current. They are used to separate
conductors from each other and from supporting structures. Common insulators include
glass, rubber, plastic, and porcelain. The effectiveness of an insulator is measured by its
dielectric strength, which is the maximum electric field it can withstand without breaking
down. Over time, environmental factors such as moisture and contamination can reduce
the dielectric strength of an insulator, leading to leakage current."
1. What is the primary purpose of an insulator as described in the passage?
A) To conduct electricity efficiently.
B) To resist the flow of electric current and separate conductors.
C) To increase the voltage of a circuit.
D) To store electrical charge.
Correct Answer: B
Explanation: The very first sentence states, "Insulators are materials that resist the flow
of electric current. They are used to separate conductors..." Option B is a direct paraphrase
, of this. A, C, and D are descriptions of conductors, transformers, and capacitors,
respectively.
2. According to the passage, what factors can degrade the performance of an
insulator?
A) High frequency and low resistance.
B) Moisture and contamination.
C) High conductivity and low dielectric strength.
D) Overheating and high voltage only.
Correct Answer: B
Explanation: The last sentence explicitly states: "...environmental factors such as
moisture and contamination can reduce the dielectric strength..." The passage does not
mention frequency, overheating, or high voltage as degrading factors.
3. The term "dielectric strength" refers to:
A) The resistance to heat.
B) The maximum electric field an insulator can withstand.
C) The weight of the insulating material.
D) The color of the insulator.
Correct Answer: B
Explanation: The passage defines it clearly: "...dielectric strength, which is the maximum
electric field it can withstand without breaking down."
PASSAGE B:
"LADWP requires all personnel working on or near energized equipment to wear
appropriate Personal Protective Equipment (PPE). This includes rubber insulating gloves
with leather protectors, hard hats, and flame-resistant clothing. Before each use, gloves
, must be air-tested to check for punctures. If a puncture is found, the gloves must be
immediately removed from service and retested by a certified lab."
4. What must be done to rubber gloves before each use?
A) Washed with soap and water.
B) Air-tested for punctures.
C) Stored in direct sunlight.
D) Rolled up tightly.
Correct Answer: B
Explanation: The text explicitly commands: "Before each use, gloves must be air-tested to
check for punctures." Washing, sunlight, and rolling are not mentioned.
5. What is the consequence of finding a puncture in a glove during the test?
A) It can still be used for low-voltage work.
B) It must be patched immediately.
C) It must be removed from service and sent to a lab.
D) It should be double-gloved.
Correct Answer: C
Explanation: The passage states: "If a puncture is found, the gloves must be immediately
removed from service and retested by a certified lab." Patching or double-gloving is not
permitted per LADWP rules.
SECTION 2: MATHEMATICAL REASONING & ALGEBRA
Directions: Solve each problem. Show your work step-by-step. You may use a calculator on
the real exam, but practice these manually.
, 6. A crew has 1,500 feet of cable. They use 3/5 of it on Monday and 1/4 of
the remaining on Tuesday. How many feet are left?
A) 450
B) 375
C) 300
D) 225
Correct Answer: A
Step-by-Step Work:
Monday usage: 1,500 × (3/5) = 1,500 × 0.6 = 900 ft used.
Remaining after Monday: 1,500 – 900 = 600 ft.
Tuesday usage: 600 × (1/4) = 150 ft used.
Remaining total: 600 – 150 = 450 ft.
7. Solve for x: 3(x - 4) = 2x + 7
A) 5
B) 19
C) 11
D) 23
Correct Answer: B
Step-by-Step Work:
Distribute the left side: 3x – 12 = 2x + 7
Subtract 2x from both sides: (3x – 2x) – 12 = 7 → x – 12 = 7
Add 12 to both sides: x = 19
8. A transformer has a primary voltage of 4,800 volts and a secondary voltage of
240 volts. What is the turns ratio (Primary : Secondary)?
A) 20:1
B) 1:20
