Electrical Craft Helper (ECH) Practice Exam

These questions are part of the practice quiz. Start practicing

• How is a three-phase electrical system different from a single-phase system?
• If someone uses a joking manner to discuss a serious mistake made by the supervisor, how should you respond?
• What type of circuit breaker is used for sensitive electronic equipment?
• What type of circuit requires a fuse or circuit breaker?
• What is the primary function of a multimeter?
• To ensure a device remains de-energized during repairs and maintenance, you should:
• Most injuries arising from the manual handling of materials are caused by:
• What does a circuit breaker do?
• In tools for thread cutting, which is best for plastic rather than metal?
• What is the best tool to tighten a rigid 1-inch conduit coupling to a threaded conduit?
• What does the term "service entrance" refer to?
• What should be done if any damage is found on a rope during inspection?
• What is the formula to calculate electrical power?
• What is the length of an 80-inch 2x4 expressed in feet?
• What does switchgear control?
• If you think the equipment operator overloaded your truck, what should be your next action?
• What is the total weight of 5 cartons of 6 pounds each?
• What is the primary function of a transformer in electrical systems?
• What is the recommended action if a vehicle's brakes are not working properly?
• What is the term for electrical energy lost in the form of heat?
• What should be done before starting work with electrical circuits?
• What does the term "transformer" refer to?
• What is the length of the longer part if a 100-foot tape breaks into two parts, and the shorter part is 126.1 feet?
• If a 30-pound spool of copper wire costs $78 and the empty spool weighs 4 pounds, what is the approximate price per pound of copper wire?
• What is the product of 5/8 multiplied by 3/8?
• Which tool would be suitable for fine adjustments on machinery?
• What action is recommended if you encounter a flashing red light at an intersection?
• What is the primary function of a surge protector?
• How often should electrical cords be inspected for safety?
• Define amperage.
• What kind of electrical hazards does a residual current device (RCD) protect against?
• Why is understanding electrical units important for electrical work?
• What hazards do protective helmets (hard hats) help protect against?
• According to safety recommendations, what should be done when water rises in basements to near electrical motors?
• What is the primary hazard associated with confined spaces?
• Before entering a confined space, what is the first step required by CALOSHA?
• Which tool is designed to facilitate a tighter grip on fasteners?
• In what type of environment is explosion-proof equipment typically needed?
• The tool depicted as a band saw is typically used for what material?
• What is the purpose of a circuit breaker?
• What is the easiest tool to cut bolts or steel rods?
• Brake lights and turn signal lights are important:
• What is a panelboard?
• Which statement regarding hard hats at job sites is true?
• If a worker can process 76 items every hour, how many items can they process in 3 hours and 45 minutes?
• If a 4-foot wire weighs 1/2 pound, what would 400 feet weigh?
• What component is essential for protecting circuits in homes?
• How does a parallel circuit differ from a series circuit?
• How does Wheel C turn in relation to Wheel B?
• What should be done if electrical equipment is overheated?
• Define short circuit.
• What does EGC stand for in electrical terminology?
• Which one of the following is generally used to increase or decrease voltage?
• What is the result of dividing 18 by 6?
• What does the term "circuit overload" refer to?
• How frequently should all ropes be checked according to safety standards?
• What does a tachometer indicate about the motor of a pump?
• Which tool is commonly used to bore holes in metal?
• When is it acceptable to cross red "do not enter" tape on a construction site?
• If a box contains 400 couplings and you have 4 full boxes in stock, how many couplings do you have before considering the 1/4 full box?
• How does Wheel B turn in relation to Wheel D?
• What does "overcurrent protection" refer to?
• Which number corresponds to a standard tool for drilling?
• What is the role of a junction box in electrical installations?
• When would you most likely use a multimeter in electrical work?
• Which tool would you typically use for tightening bolts?
• Which tool is ideal for cutting a metal pipe in half before threading?
• What is 22% of 35 plus 49% of 66 most nearly equal to?
• What does a walk-around inspection not include?
• When should portable electric tools and extension cords be checked for serviceability?
• What is the most effective way to establish a good working relationship with co-workers?
• What type of personal protective equipment might be needed when working near flammable materials?
• When a truck pulls to the right when the brakes are applied, what is the best action to take?
• What is the result of adding 5 + 15?
• To prevent injury when lifting a 50-lb box, the body part where the most strength should be focused is your:
• Your truck has been improperly loaded. What should you do?
• Once you have secured a firm grip on the object, which of the following is the proper way to stand?
• Which tool is best for gripping large or hard-to-reach objects?
• What should a worker wear as a safety precaution when dealing with heavy materials or tools?
• What is the speed limit in a residential zone unless otherwise posted?
• Which of the following protects a power line against damage from lightning by carrying the charge away from the power line?
• What should be considered when examining a wire rope with an eye splice that has been tied into knots?
• When should drill bits be removed and drill motors returned to their cases and storage areas?
• What direction does Wheel D turn compared to Wheel C?
• In electrical safety, what does PPE stand for?
• What is the function of a fuse in an electrical circuit?
• Which tool is best used to remove burrs on a stud?
• How much does a carton weigh if it is six pounds and a box weighs 1/3 of a carton?
• If a ladder has a broken rung, what is the best practice?
• What is the main purpose of the National Electrical Code (NEC)?
• What is essential for ensuring safety when working with high voltage systems?
• Which tool is used for finishing off holes to a desired diameter?
• What do the terms "live" and "neutral" refer to in an electrical circuit?
• What should be done when the low battery light comes on?
• If a solvent used to clean electrical equipment spills on your arm and begins to burn, what is the best source for first aid information?
• In which scenario should a worker immediately stop operation when dealing with electrical equipment?
• How many size 2 spools are needed to fulfill an order for 6,000 feet if size 1 spools hold 250 feet?
• When using a 10-foot ladder, what is the maximum recommended working height?
• What is the function of a relay in an electrical circuit?
• What should you do when you hear a siren?
• Which of the following devices can be used to ensure safe electrical measurements?
• What is the purpose of conduit in electrical installations?
• What tool is identified by its number as a pipe vise?
• A new worker is making mistakes that you notice. What should you do?
• What type of electrical installation requires a permit?
• What outcome can result from improper handling of electrical devices?
• To test if a 110-volt lighting circuit is alive, a person should best:
• What is 'load calculation' in electrical work?
• In environments with combustible materials, which safety equipment is critical?
• When is texting while driving permitted?
• What is a capacitor used for in electrical circuits?
• A box contains 400 pipe couplings. If there are four full boxes in stock and one that is 1/4 full, how many couplings are now on hand?
• What is the function of a ground fault monitor?
• What is the average distance between poles for a line that has 24 poles per 1,000 meters?
• When lifting a 25-lb box of material, the best lifting practice is to:
• What does NEC Article 110 cover?
• You believe your supervisor has made a mistake. What is the best course of action?
• What does the term "voltage drop" refer to?
• What does an electrical schematic diagram provide?
• What is the best tool for measuring a very long conduit run?
• Which tool is best suited for removing a cotter pin?
• Which device is used to convert AC voltage to DC voltage?
• If 5 pieces of equipment cost $237.28, how much would eight pieces cost?
• What should you do before using a vehicle that has been used by others?
• What is the equivalent fraction of 5/8 and 3/8 added together?
• If a painter is explaining your duties to you, but later tries to boss you around, what should you do?
• When lifting heavy objects, which part of the body should bear the bulk of the physical effort?
• At what distance from a structure should the base of a portable ladder, extending to 20 feet high, be placed?
• When should you secure help in lifting an object?
• Which tool is represented as a pipe reamer?
• What does "tin-plated wire" help to prevent?
• What is the main advantage of LED lighting?
• If filing names alphabetically, which name would be second on the list?
• How much total weight is there if there are 5 cartons weighing 6 pounds each and 4 boxes weighing 2 pounds each?
• What tool would you use to remove nut 10 in figure 1?
• If you are unjustly blamed by a supervisor for another employee's actions, what should you do?
• What is the result of subtracting 12 - 4?
• What does a blue-painted curb signify?
• What is the primary responsibility of supervisors regarding reports?
• When does a pedestrian have the right of way at an intersection without a painted crosswalk?
• Which hazard is commonly associated with electrical work?
• When should eye protection be worn?
• How should you respond if you see someone driving aggressively?
• What is the function of a safety inspection for vehicles?
• What precaution should be taken regarding ventilation when using hazardous materials in confined spaces?
• What is the standard unit of measure for electrical resistance?
• Which tool is best for verifying that equipment fastened to a wall is parallel to the ground?
• What is the decimal equivalent of 15/64?
• Why is it particularly important to check for oxygen levels in confined spaces prior to entry?
• Which type of electrical cord is recommended for outdoor use?
• Which tool is most efficient for making precise adjustments on fasteners?
• Which safety device is used to detect arc faults?
• What type of motion characterizes a tool primarily used for drilling?
• What is the typical voltage of a standard residential electrical system in the U.S.?
• How many 120-foot lengths of wire can be cut from five 500-foot reels?
• When backing up a large vehicle, what is the safest practice?
• When working in an underground vault with gas-filled power and communication cables, what should the worker always remember?
• How does Wheel A turn in relation to the driver?
• What is the maximum acceptable value if a specification diagram lists it as 47 ± 4?
• What is Ohm's Law?
• What is the maximum speed limit on a 2-lane undivided highway in California unless otherwise posted?
• Why is good ventilation important when using a blowtorch in confined areas?
• What weight would a roll of wire be if 1/2 pound is the weight for 4 feet?
• What does AC stand for in electrical terms?
• What is the standard color for hot wires in electrical circuits?
• If a disconnect switch is rated for 600 Volts, in which applications can it be used?
• Of the following, the best way to stand when lifting a heavy object from the ground is with the feet:
• Why is proper training essential for those working with electrical components?
• What does wire gauge indicate?
• If a poleline requires 24 poles per 1,000 meters, how many poles are needed for 2,000 meters?
• What knot should be used to lift a bundle of conduit from the ground to a landing 30 feet above the ground using a rope?
• What is the best method to check brake lights on a vehicle?
• What should be done before working on an electrical circuit?
• Which hand tool has a handle, a shank, and a blade?
• What is meant by "electromagnetism"?
• What is the best tool to verify the dimensions of a high voltage equipment room?
• What is the purpose of a wattmeter?
• A confined space is considered hazardous when oxygen levels are below what percentage?
• What is the purpose of wire insulation?
• What is the purpose of grounding an electrical system?
• What does GFCI stand for and what is its function?
• What is the color code for a non-metallic sheathed cable’s ground wire?
• Tool No. 2 is primarily used for what purpose?
• What type of wire is commonly used for residential lighting circuits?
• What is the appropriate tool for making a center before drilling a hole?
• What can a multimeter NOT measure?
• Of the following, which knot can be tied in the middle of the line?
• When working in a construction zone with an overhead crane in use, which safety equipment should you use?
• What is a common safety measure taken when working with gaspipes or cables?
• What is a switch function in an electrical circuit?
• What type of tool is used primarily for tightening or loosening nuts and bolts?
• When can you remove a lock with a "do not remove" tag from electrical equipment?
• Which item is important to inspect regularly on a work vehicle?
• Which situation would require immediate attention while working with electricity?
• Which tool is best for turning odd or non-standard size nuts or bolts?
• What is a significant risk associated with working on electrical systems without adequate training?
• Which tool is typically used to cut sheet metal?
• To tie a line around a timber or post so that it will hold temporarily but can be readily undone, this is defined as:
• The best tool used to measure 15 feet of wire is a?
• If you suspect a load in the back of a vehicle may shift during transit, you should:
• Diagonal cutting pliers are represented by which number?
• When should you lift a heavy object without having your back straight and using your legs?
• To measure the amount of cable that is on a reel, it is most accurate to:
• What type of shoes should be worn to prevent foot injuries in a workshop environment?
• What safety equipment should be used when working in a residential street?
• What is the essential function of a tool designed to chip metal?
• In alphabetical order, which name appears second?
• Which number corresponds to the screw pitch gauge?
• What is the function of a power surge?
• What is the product of 7 multiplied by 8?
• If the length of a board is 80 inches, how many feet long is it?
• What should an employee do if instructed by a supervisor to perform a task that cannot be done alone?
• If a length of 250 feet of wire is on a spool, how much wire is on a size 2 spool?
• For a dimension of 3 5/8 inches, what is the lower limit if there is a tolerance of plus or minus 1/4 inch?
• What tool is designed to cut threads on the end of pipes?
• Which tool is identified for precision work on small components?
• Why is it essential to check ropes periodically?
• In rigging operations, which of the following is essential for making a safe hitch?