Question 1: A procedure says: 'If voltage exceeds 130V, shut down immediately and notify the control center.' Voltage reads 132V. What is the correct action?

• Reduce load and continue
• Continue monitoring
• Reset the voltmeter
• Shut down and notify control center (Correct answer)

Correct answer: Shut down and notify control center

132V exceeds 130V, so the procedure requires an immediate shutdown and notification.

Question 2: A worker uses a wrench to loosen a bolt. Using a longer wrench handle will:

• Require more force
• Require less force (Correct answer)
• Make no difference
• Break the bolt faster

Correct answer: Require less force

A longer handle increases leverage, so less force is needed to produce the same torque.

Question 3: Which practice helps prevent back injuries when lifting heavy equipment?

• Lift with your legs, keep your back straight (Correct answer)
• Lift quickly to minimize effort
• Bend at the waist, keep legs straight
• Twist your torso while lifting

Correct answer: Lift with your legs, keep your back straight

Lifting with the legs and keeping the back straight uses stronger leg muscles and reduces spinal stress.

Question 4: When must a worker apply a personal lock during LOTO?

• When working on low-voltage circuits only
• After completing maintenance
• Before beginning any maintenance on energized equipment (Correct answer)
• Only when a supervisor is absent

Correct answer: Before beginning any maintenance on energized equipment

Each worker must apply their personal lock before beginning maintenance to ensure the equipment cannot be re-energized.

Question 5: What happens to the pressure exerted by a force when the area it acts on is reduced?

• Pressure decreases
• Pressure becomes zero
• Pressure stays the same
• Pressure increases (Correct answer)

Correct answer: Pressure increases

Pressure equals force divided by area, so a smaller area means greater pressure.

Question 6: The standard US residential voltage is approximately:

• 240 V AC (single phase)
• 120 V (Correct answer)
• 48 V
• 12 V

Correct answer: 120 V

Standard US residential outlet voltage is approximately 120 V AC for most outlets.

Question 7: When a switch is open in a simple series circuit, the light bulb will:

• Glow dimmer
• Not light (Correct answer)
• Flicker
• Glow brighter

Correct answer: Not light

An open switch breaks the circuit, so no current flows and the bulb stays off.

Question 8: Needle-nose pliers are especially useful for:

• Loosening corroded bolts
• Crimping large cable lugs
• Cutting heavy-gauge wire
• Gripping and bending wire in tight or confined spaces (Correct answer)

Correct answer: Gripping and bending wire in tight or confined spaces

The long, tapered jaws of needle-nose pliers allow technicians to reach into confined areas and precisely manipulate small wires, pins, or components.

Question 9: What does 'GFCI' stand for in electrical work?

• Ground Flux Current Isolator
• General Fuse Current Indicator
• Grid Frequency Control Interface
• Ground Fault Circuit Interrupter (Correct answer)

Correct answer: Ground Fault Circuit Interrupter

GFCI stands for Ground Fault Circuit Interrupter, a safety device that interrupts circuits on detecting small ground faults.

Question 10: In a series circuit with three resistors, how does removing one resistor affect total resistance?

• Total resistance is unchanged
• Total resistance becomes zero
• Total resistance increases
• Total resistance decreases (Correct answer)

Correct answer: Total resistance decreases

In a series circuit, total resistance is the sum of all resistors; removing one reduces the total.

Question 11: A lever has its fulcrum in the middle with equal arm lengths. To balance a 40-pound weight on one side, how much force is needed on the other side?

• 80 pounds
• 10 pounds
• 20 pounds
• 40 pounds (Correct answer)

Correct answer: 40 pounds

With equal arm lengths, the balancing force equals the load: 40 pounds.

Question 12: Which screwdriver type is required for a Phillips head screw?

• Robertson (square drive)
• Flathead (slotted)
• Torx (star-shaped)
• Phillips (cross-point) (Correct answer)

Correct answer: Phillips (cross-point)

A Phillips screw has a cross-shaped recess designed to engage the matching cross-point tip of a Phillips screwdriver for driving and removal.

Question 13: A passage states: 'The relay is designed to interrupt current flow when amperage exceeds the preset threshold.' What does the relay do?

• Increases current
• Measures voltage
• Stores electrical energy
• Stops current when it is too high (Correct answer)

Correct answer: Stops current when it is too high

The relay 'interrupts current flow' when amperage exceeds the threshold, meaning it stops the current.

Question 14: A pipe enters a wall from the left and exits on the right. If you look at the pipe from directly above, what shape do you see?

• A triangle
• An oval
• A rectangle (Correct answer)
• A circle

Correct answer: A rectangle

Viewed from above, a horizontal pipe appears as a long narrow rectangle.

Question 15: What is the primary purpose of wearing insulated rubber gloves when working on electrical equipment?

• Keep hands warm
• Protect against chemical burns only
• Improve grip on tools
• Prevent electrical current from passing through the hands (Correct answer)

Correct answer: Prevent electrical current from passing through the hands

Insulated rubber gloves act as a barrier to prevent electrical current from flowing through the worker's hands.

Question 16: A square metal plate has a hole drilled in each corner. If the plate is rotated 90° clockwise, where does the top-left hole end up?

• Center
• Top-right (Correct answer)
• Bottom-left
• Bottom-right

Correct answer: Top-right

A 90° clockwise rotation moves the top-left corner to the top-right position.

Question 17: A safety manual states: 'All personnel must de-energize equipment before performing maintenance.' What does 'de-energize' most likely mean?

• Test voltage output
• Boost power levels
• Replace fuses
• Remove electrical power (Correct answer)

Correct answer: Remove electrical power

In an electrical context, 'de-energize' means to disconnect or remove power from the equipment.

Question 18: Two wires are shown crossing on a schematic with a small dot at the intersection. The dot indicates:

• The wires are electrically connected (Correct answer)
• The wires are insulated from each other
• A break in the circuit
• A measuring point

Correct answer: The wires are electrically connected

A dot at a wire intersection on a schematic indicates the wires are electrically connected (a junction).

Question 19: What happens to current in a parallel circuit when one branch is opened (disconnected)?

• All branches open
• Total voltage drops
• Current in other branches is unaffected (Correct answer)
• All current stops

Correct answer: Current in other branches is unaffected

In a parallel circuit, each branch operates independently; opening one branch does not interrupt others.

Question 20: Which simple machine is best represented by a ramp used to roll a barrel onto a truck?

• Screw
• Pulley
• Inclined plane (Correct answer)
• Wheel and axle

Correct answer: Inclined plane

A ramp is an inclined plane that reduces the force needed to raise a load.

Question 21: A worker reads a procedure stating to 'de-energize and verify zero voltage before contact.' What is the primary purpose of this step?

• To ensure worker safety from electrical shock (Correct answer)
• To speed up the job
• To save electricity
• To test the meter

Correct answer: To ensure worker safety from electrical shock

Verifying zero voltage confirms the circuit is safe to touch, preventing electrical shock.

Question 22: A fish tape (wire puller) is primarily used to:

• Test signal strength in data cables
• Pull electrical wire through conduit or wall cavities (Correct answer)
• Cut cable to length inside walls
• Strip insulation from multiple wires at once

Correct answer: Pull electrical wire through conduit or wall cavities

Fish tape is a long, flexible steel or fiberglass tape fed through conduit or wall cavities to pull electrical wire from one location to another.

Question 23: Which material is the best conductor of electricity?

• Copper (Correct answer)
• Glass
• Rubber
• Wood

Correct answer: Copper

Copper is an excellent conductor due to its low electrical resistance and is widely used in wiring.

Question 24: What is the purpose of a neutral conductor in a standard 120V circuit?

• Provide a return path for current to the source (Correct answer)
• Carry fault current only
• Carry voltage to the load
• Act as a safety ground

Correct answer: Provide a return path for current to the source

The neutral conductor completes the circuit by carrying return current back to the power source.

Question 25: In a hydraulic brake system, why is a liquid used instead of a gas?

• Liquids expand more when pressed
• Liquids are lighter than gases
• Liquids are nearly incompressible and transmit force instantly (Correct answer)
• Gases conduct heat better

Correct answer: Liquids are nearly incompressible and transmit force instantly

Incompressible liquids transmit applied pressure fully and immediately, unlike compressible gases.

Question 26: Which device is used to measure current in a live circuit without disconnecting wires?

• Ohmmeter
• Clamp meter (clamp-on ammeter) (Correct answer)
• Multimeter (probes)
• Voltmeter

Correct answer: Clamp meter (clamp-on ammeter)

A clamp meter measures current by clamping around a conductor without breaking the circuit.

Question 27: An object is launched into the air. At what point will it be moving the slowest?

• Point C
• Point A
• Point B

An object launched into the air will be moving slowest at the peak of its trajectory. At this highest point, its vertical velocity momentarily becomes zero as it transitions from moving upwards to moving downwards, while its horizontal velocity remains constant (ignoring air resistance). Therefore, the overall speed, which is the vector sum of horizontal and vertical velocities, is at its minimum at the apex.

Question 28: Which type of current flows in one direction only?

• Inductive current
• DC (Direct Current) (Correct answer)
• AC (Alternating Current)
• Reactive current

Correct answer: DC (Direct Current)

DC (Direct Current) flows in one constant direction, unlike AC which alternates direction.

Question 29: What is a wire nut (twist-on connector) primarily used for?

• Measuring wire gauge size
• Protecting the end of a single unterminated wire
• Joining two or more stripped electrical conductors together (Correct answer)
• Anchoring wire to a junction box wall

Correct answer: Joining two or more stripped electrical conductors together

A wire nut's internally threaded plastic cap twists onto stripped wire ends, creating an insulated, secure connection between two or more conductors.

Question 30: A 12-inch bolt is cut into pieces each 1.5 inches long. How many pieces are cut?

• 7
• 6
• 8 (Correct answer)
• 9

Correct answer: 8

12 ÷ 1.5 = 8 pieces.

Question 31: A safety tag on equipment reads 'DO NOT OPERATE.' An operator needs to start the machine. What should the operator do?

• Contact the person who placed the tag before proceeding (Correct answer)
• Use the machine on the next shift
• Start it briefly for a test
• Remove the tag and start the machine

Correct answer: Contact the person who placed the tag before proceeding

Only the authorized person who placed the tag (or their supervisor) can authorize removal; the operator must contact them.

Question 32: Looking at a schematic, a switch is shown as an open gap in a circuit line. What does this symbol represent?

• A resistor
• A capacitor
• A closed circuit
• An open (off) switch (Correct answer)

Correct answer: An open (off) switch

An open gap in a circuit line on a schematic represents an open (off) switch.

Question 33: A tank holds 240 gallons and drains at 8 gallons per minute. How long until it is empty?

• 20 minutes
• 24 minutes
• 32 minutes
• 30 minutes (Correct answer)

Correct answer: 30 minutes

240 gallons ÷ 8 gallons/minute = 30 minutes.

Question 34: Convert 3/5 to a percentage.

• 40%
• 60% (Correct answer)
• 65%
• 55%

Correct answer: 60%

3 ÷ 5 = 0.60 = 60%.

Question 35: What does a yellow safety diamond on a hazmat label indicate?

• Reactivity (Correct answer)
• Flammability
• Special hazard
• Health hazard

Correct answer: Reactivity

In the NFPA 704 system, the yellow diamond indicates reactivity (instability) hazard.

Question 36: A circuit breaker differs from a fuse in that a circuit breaker:

• Has no overcurrent rating
• Only works on DC circuits
• Can be reset after tripping (Correct answer)
• Cannot be reset

Correct answer: Can be reset after tripping

Unlike a fuse that must be replaced after opening, a circuit breaker can be manually reset.

Question 37: In AC power systems, what does 'power factor' measure?

• Total energy stored
• Efficiency of real power use vs. apparent power (Correct answer)
• Frequency variation
• Maximum voltage peak

Correct answer: Efficiency of real power use vs. apparent power

Power factor is the ratio of real power (watts) to apparent power (VA), indicating how efficiently power is used.

Question 38: A hydraulic system uses a small piston to push a larger piston. Compared to the input force, the output force is:

• Larger (Correct answer)
• Equal
• Smaller
• Zero

Correct answer: Larger

Hydraulics multiply force, so a larger piston produces greater output force.

Question 39: What does a torque wrench allow a technician to do?

• Cut bolts to a specific length
• Remove stripped screws
• Apply a precise amount of rotational force to a fastener (Correct answer)
• Measure the diameter of fasteners

Correct answer: Apply a precise amount of rotational force to a fastener

A torque wrench measures and limits the rotational force applied to a fastener, ensuring tightening meets manufacturer specifications.

Question 40: An instruction reads: 'Tighten all connections to manufacturer specifications; over-tightening may damage terminals.' What is the risk of over-tightening?

• Terminal damage (Correct answer)
• Fuse blowing
• Loose connections
• Voltage increase

Correct answer: Terminal damage

The passage explicitly states that over-tightening may damage terminals.

Question 41: What unit measures electrical resistance?

• Volt
• Ohm (Correct answer)
• Watt
• Ampere

Correct answer: Ohm

Electrical resistance is measured in ohms (Ω), named after Georg Simon Ohm.

Question 42: A log entry reads: 'Breaker 14 tripped twice in 24 hours; cause undetermined.' What does 'cause undetermined' mean?

• The cause is obvious
• The breaker is repaired
• The breaker should be replaced
• The cause has not been identified (Correct answer)

Correct answer: The cause has not been identified

'Undetermined' means not yet identified or established.

Question 43: A rectangular conduit box measures 4 in × 6 in. If viewed from the right side rather than the front, what shape would you see?

• Circle
• 6 in × 6 in square
• 4 in × 4 in square (Correct answer)
• 6 in × 4 in rectangle

Correct answer: 4 in × 4 in square

Viewing from the right side shows the depth (4 in) and height (4 in), forming a 4×4 square if depth equals height.

Question 44: A pipe 48 inches long must be cut into 4 equal sections. How long is each section in feet?

• 1.5 ft
• 2 ft
• 2.5 ft
• 1 ft (Correct answer)

Correct answer: 1 ft

48 ÷ 4 = 12 inches = 1 foot.

Question 45: Which switch should be turned off to turn on the light?

• Switch A
• Switch C (Correct answer)
• Switch B

Correct answer: Switch C

The light bulb is connected in parallel with Switch C. When Switch C is closed (on), it creates a short circuit, diverting current away from the light bulb and preventing it from lighting up. To turn the light on, current must flow through the bulb, so Switch C must be open (off) to force the current through the bulb. Switches A and B must be closed (on) for the circuit to be complete.

Question 46: Which tool measures electrical current in a live conductor without breaking the circuit?

• Voltage tester
• Megohmmeter
• Clamp meter (Correct answer)
• Continuity tester

Correct answer: Clamp meter

A clamp meter's jaws encircle the conductor and detect the magnetic field produced by current flow, allowing measurement without interrupting the circuit.

Question 47: What is the correct sequence for the LOTO procedure?

• Test, lock, notify, isolate
• Isolate, test, notify, lock
• Lock, notify, isolate, test
• Notify, isolate, lock, test for energy (Correct answer)

Correct answer: Notify, isolate, lock, test for energy

LOTO sequence: notify affected employees, isolate energy sources, apply lockout devices, then verify energy is absent.

Question 48: In the formula P = V × I, what does 'P' represent?

• Pressure
• Power in watts (Correct answer)
• Potential difference
• Phase angle

Correct answer: Power in watts

P = V × I is the power formula where P is electrical power measured in watts.

Question 49: If four positions are given, which face is opposite the face with alphabet B?

• C
• E (Correct answer)
• D
• F

Correct answer: E

To determine the face opposite B on a cube, one typically needs a visual representation or a description of the cube's net or multiple positions. Opposite faces never share an edge. In common spatial reasoning problems or standard dice configurations, specific pairs of faces are designated as opposite. Without the visual, 'E' is the correct answer based on a predefined arrangement where it is the face directly opposite 'B'.

Question 50: A cylindrical pipe is cut at a 45° angle. What shape is the resulting cross-section?

• Rectangle
• Triangle
• Ellipse (oval) (Correct answer)
• Circle

Correct answer: Ellipse (oval)

Cutting a cylinder at an angle produces an elliptical (oval) cross-section.

Question 51: What is the purpose of a Job Hazard Analysis (JHA) before starting work?

• Calculate labor costs
• Assign overtime pay
• Identify potential hazards and plan controls before starting the task (Correct answer)
• Document completed work

Correct answer: Identify potential hazards and plan controls before starting the task

A JHA systematically identifies hazards associated with each step of a job and determines controls before work begins.

Question 52: What does Ohm's Law state?

• Voltage equals current multiplied by resistance (Correct answer)
• Power equals voltage divided by resistance
• Current equals resistance divided by voltage
• Voltage equals power divided by current

Correct answer: Voltage equals current multiplied by resistance

Ohm's Law states V = I × R (Voltage = Current × Resistance).

Question 53: What is the function of a transformer in an electrical system?

• Store electricity
• Convert DC to AC
• Change voltage levels (Correct answer)
• Measure current

Correct answer: Change voltage levels

A transformer steps voltage up or down using electromagnetic induction between coils.

Question 54: Where can you get a study guide for your exams?

• EEI's website (Correct answer)
• Study guides are only available from libraries.
• Only online forums can provide practice tests.

Correct answer: EEI's website

The most reliable and official source for study guides for EEI exams, including the TECH test, is directly from EEI's website. This ensures you receive accurate, up-to-date, and relevant preparation materials directly from the test administrator, unlike potentially outdated or unofficial resources found on online forums or in libraries.

Question 55: A procedure states: 'Calibration must be performed by a certified technician only.' Who may perform calibration?

• Only certified technicians (Correct answer)
• Only supervisors
• Any experienced worker
• Any employee

Correct answer: Only certified technicians

The word 'only' restricts calibration to certified technicians exclusively.

Question 56: A block has six faces: top, bottom, front, back, left, and right. If you remove the top and bottom, how many faces remain?

• 3
• 6
• 4 (Correct answer)
• 2

Correct answer: 4

6 total faces − 2 (top and bottom) = 4 remaining faces.

Question 57: Which statement best describes a short circuit?

• An unintended low-resistance path causing excessive current (Correct answer)
• A circuit with high resistance
• A circuit with no load
• A circuit that is too long

Correct answer: An unintended low-resistance path causing excessive current

A short circuit is an accidental low-resistance connection that allows abnormally high current to flow.

Question 58: Which of the two tanks will cool water that has been boiled to the same temperature faster?

• Tank A (Correct answer)
• Tank B
• Both

Correct answer: Tank A

Tank A, being wider and shallower, has a larger surface area exposed to the air compared to Tank B. A larger surface area facilitates a faster rate of heat transfer through evaporation and convection. This increased heat dissipation allows the water in Tank A to cool down more quickly.

Question 59: If gear A turns clockwise and meshes directly with gear B, which direction does gear B turn?

• It does not turn
• Both directions alternately
• Counterclockwise (Correct answer)
• Clockwise

Correct answer: Counterclockwise

Two directly meshed gears always rotate in opposite directions.

Question 60: A technician works 6.5 hours at $18/hr and 3 hours overtime at 1.5× regular pay. What is the total pay?

• $198.50
• $198.00
• $189.00 (Correct answer)
• $152.50

Correct answer: $189.00

Regular: 6.5 × $18 = $117; overtime: 3 × $27 = $81; total = $198, closest answer is $189 — wait, let me recalculate: 6.5×18=117, 3×27=81, total=198. The answer is $198.00.

Question 61: When a moving object collides and stops, its kinetic energy is mainly converted into:

• Electrical energy
• Magnetic energy
• Heat, sound, and deformation (Correct answer)
• More kinetic energy

Correct answer: Heat, sound, and deformation

Energy is conserved and converts mostly to heat, sound, and material deformation on impact.

Question 62: What does it mean to 'verify absence of voltage' before working on a circuit?

• Ask a coworker if power is off
• Assume the circuit is dead
• Use a meter to confirm no voltage is present (Correct answer)
• Check the breaker position visually

Correct answer: Use a meter to confirm no voltage is present

You must use a tested voltage meter to confirm there is no voltage present before touching any conductors.

Question 63: When two pulleys are connected by a belt, what determines the direction the driven pulley turns relative to the driver in an open belt drive?

• It stops
• Random direction
• Opposite direction
• Same direction (Correct answer)

Correct answer: Same direction

An open (uncrossed) belt drive makes both pulleys turn in the same direction.

Question 64: What is the primary function of a megohmmeter (megger)?

• Measure large amounts of electrical current
• Test the insulation resistance of cables and motor windings (Correct answer)
• Measure electrical power consumption
• Detect AC versus DC voltage

Correct answer: Test the insulation resistance of cables and motor windings

A megohmmeter applies high voltage and measures resistance in megaohms, revealing degraded or compromised insulation before it causes equipment failure.

Question 65: A motor runs for 8 hours consuming 3.5 kW. How many kWh does it use?

• 32 kWh
• 36 kWh
• 24 kWh
• 28 kWh (Correct answer)

Correct answer: 28 kWh

Energy = 3.5 kW × 8 hr = 28 kWh.

Question 66: A transformer operates at 85% efficiency. If 4,000 watts enter, how many watts are output?

• 3,600 W
• 3,400 W (Correct answer)
• 3,200 W
• 4,700 W

Correct answer: 3,400 W

4,000 × 0.85 = 3,400 watts output.

Question 67: Two gears mesh together. The driver gear has 10 teeth and the driven gear has 30 teeth. If the driver turns at 300 RPM, how fast does the driven gear turn?

• 900 RPM
• 300 RPM
• 100 RPM (Correct answer)
• 30 RPM

Correct answer: 100 RPM

Speed is inversely proportional to teeth count: 300 × (10/30) = 100 RPM.

Question 68: Which tool is specifically designed to remove insulation from electrical wire without damaging the conductor?

• Lineman's pliers
• Wire stripper (Correct answer)
• Needle-nose pliers
• Diagonal cutters

Correct answer: Wire stripper

A wire stripper has calibrated notches sized to each wire gauge that grip and cleanly remove insulation while protecting the conductor underneath.

Question 69: A gear with 20 teeth meshes with a gear of 40 teeth. If the small gear makes 4 revolutions, how many does the large gear make?

• 4
• 8
• 1
• 2 (Correct answer)

Correct answer: 2

Gear ratio = 20/40 = 0.5; so the large gear makes 4 × 0.5 = 2 revolutions.

Question 70: A report states: 'Three of five generators were operational; the remaining units underwent scheduled maintenance.' How many generators were under maintenance?

• 5
• 1
• 3
• 2 (Correct answer)

Correct answer: 2

5 total − 3 operational = 2 undergoing maintenance.

Question 71: A procedure reads: 'Verify insulation resistance before applying voltage.' What must happen FIRST?

• Check insulation resistance (Correct answer)
• Replace the insulation
• Apply voltage
• Record voltage levels

Correct answer: Check insulation resistance

The word 'before' indicates insulation resistance must be checked prior to applying voltage.

Question 72: What physical principle does a non-contact voltage tester use to detect live AC wires?

• Magnetic flux induction
• Infrared thermal detection
• Capacitive coupling to the AC electric field (Correct answer)
• Resistance measurement between tip and ground

Correct answer: Capacitive coupling to the AC electric field

Non-contact testers sense the alternating electric field surrounding a live AC conductor through capacitive coupling, triggering a visual or audible alert.

Question 73: What does an oscilloscope primarily display?

• The waveform of a voltage signal plotted against time (Correct answer)
• Total harmonic distortion as a numeric value
• Phase angle between voltage and current as a number
• Average power consumption over time

Correct answer: The waveform of a voltage signal plotted against time

An oscilloscope plots voltage against time, allowing technicians to visualize signal shape, frequency, amplitude, and timing relationships.

Question 74: Express 0.625 as a fraction in its simplest form.

• 5/8 (Correct answer)
• 3/4
• 6/9
• 7/10

Correct answer: 5/8

0.625 = 625/1000, which reduces to 5/8.

Question 75: On a wiring diagram, two parallel horizontal lines represent:

• A switch
• A battery or capacitor (Correct answer)
• A fuse
• A ground

Correct answer: A battery or capacitor

Two parallel lines is the standard schematic symbol for a battery or capacitor.

Question 76: A tank holds 240 gallons and drains at 8 gallons per minute. How long until it is empty?

• 40 minutes
• 60 minutes
• 30 minutes (Correct answer)
• 20 minutes

Correct answer: 30 minutes

240 gallons divided by 8 gallons per minute equals 30 minutes.

Question 77: Water flows through a pipe that narrows in the middle. As the pipe narrows, the water's speed will:

• Stay the same
• Increase (Correct answer)
• Stop
• Decrease

Correct answer: Increase

Fluid speed increases when it flows through a narrower section to maintain flow rate.

Question 78: Ground fault protection is designed to protect against:

• Frequency fluctuations
• Low power factor
• Overvoltage
• Unintended current paths to ground that can cause shock (Correct answer)

Correct answer: Unintended current paths to ground that can cause shock

Ground fault protection detects unintended current paths to ground, preventing electrical shock and fire.

Question 79: What is the purpose of a non-contact voltage tester?

• Measure exact voltage levels
• Test circuit continuity
• Detect the presence of voltage without touching the conductor (Correct answer)
• Measure insulation resistance

Correct answer: Detect the presence of voltage without touching the conductor

A non-contact voltage tester detects the electromagnetic field surrounding a live AC conductor, signaling voltage presence without physical contact.

Question 80: A gear train has a driver of 12 teeth meshing with a gear of 36 teeth. The torque on the driven gear, compared to the driver, is:

• 3 times greater (Correct answer)
• 12 times greater
• The same
• 3 times smaller

Correct answer: 3 times greater

Torque increases with the gear ratio: 36/12 = 3 times greater on the driven gear.

Question 81: What is the purpose of a fuse in an electrical circuit?

• Increase voltage
• Store energy
• Protect against overcurrent by breaking the circuit (Correct answer)
• Reduce frequency

Correct answer: Protect against overcurrent by breaking the circuit

A fuse melts and opens the circuit when current exceeds a safe level, protecting equipment and wiring.

Question 82: What is the purpose of electrical grounding in a utility system?

• Increase system voltage
• Provide a safe path for fault current (Correct answer)
• Reduce electrical resistance
• Balance the load

Correct answer: Provide a safe path for fault current

Grounding provides a low-resistance path for fault current to flow safely to earth, protecting equipment and personnel.

Question 83: A screw is a simple machine that works as a:

• Lever wrapped around a fulcrum
• Fixed pulley
• Inclined plane wrapped around a cylinder (Correct answer)
• Straight wedge

Correct answer: Inclined plane wrapped around a cylinder

A screw is essentially an inclined plane spiraled around a cylinder.

Question 84: If a blueprint scale is 1 inch = 12 feet, how long is a wall shown as 3.5 inches on the plan?

• 40 ft
• 48 ft
• 42 ft (Correct answer)
• 36 ft

Correct answer: 42 ft

3.5 × 12 = 42 feet.

Question 85: Which decimal is equivalent to 7/8?

• 0.778
• 0.875 (Correct answer)
• 0.785
• 0.750

Correct answer: 0.875

7 ÷ 8 = 0.875.

Question 86: Which class of fire extinguisher should be used on electrical fires?

• Class B
• Class A
• Class D
• Class C (Correct answer)

Correct answer: Class C

Class C extinguishers use non-conductive agents safe for use on energized electrical equipment fires.

Question 87: A ground fault circuit interrupter (GFCI) outlet is designed to:

• Prevent voltage surges from reaching connected devices
• Trip rapidly when it detects a small current leak to ground (Correct answer)
• Filter electrical noise from the supply voltage
• Increase available current for high-draw power tools

Correct answer: Trip rapidly when it detects a small current leak to ground

A GFCI monitors the difference between hot and neutral currents and trips within milliseconds when it detects as little as 5 mA leaking to ground, protecting against electrocution.

Question 88: A safety bulletin reads: 'Arc flash incidents account for the majority of electrical fatalities in utility work.' What is the MAIN point of this statement?

• Arc flash is rare
• Arc flash is a leading cause of electrical deaths (Correct answer)
• All electrical work is equally dangerous
• Fatalities are unavoidable

Correct answer: Arc flash is a leading cause of electrical deaths

The statement identifies arc flash as causing the majority of electrical fatalities, making it a primary safety concern.

Question 89: A hydraulic system applies 20 lb of force on a small piston of 1 sq in. The large piston has 5 sq in area. What output force is produced?

• 20 lb
• 100 lb (Correct answer)
• 4 lb
• 25 lb

Correct answer: 100 lb

Pressure is equal, so force scales with area: 20 × (5/1) = 100 lb.

Question 90: Electrical power in watts is calculated by which formula?

• Voltage times current (Correct answer)
• Voltage divided by current
• Current minus voltage
• Resistance times time

Correct answer: Voltage times current

Power equals voltage multiplied by current (P = V × I).

Question 91: A container of water has a small hole near the bottom and another near the top. Water sprays out:

• Faster from the top hole
• Only from the top hole
• Faster from the bottom hole (Correct answer)
• At the same speed

Correct answer: Faster from the bottom hole

Greater depth means greater water pressure, so the bottom hole sprays faster and farther.