Pat Testing Online Practice - Free (2014.1)

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  • 1/206 Questions

    Equipment identified as unsafe after Inspection and Test should then be

    • Identified with a fail label and withdrawn from use
    • Identified with a pass label and marked for re-test
    • Identified with a warning label and remain in use
    • Identified with a fail label and remain in use
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About This Quiz

A selection of questions taken from the best-selling Electacourse PAT Testing Exam Simulator. Purchased either on its own or as part of the popular Electacourse PAT Testing Revision Course, the PAT Testing Exam Simulator has been used by hundreds of UK electricians to help them gain the Portable Appliance Testing qualification

Pat Testing Online Practice - Free (2014.1) - Quiz

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  • 2. 

    Regulation 5 of the Provision and Use of Work Equipment Regulations 1998 states that every employer shall ensure that work equipment is

    • Maintained in an efficient state, in efficient working order and in good repair

    • Not accessible to trainee employees

    • Checked daily by a supervisor

    • Stored in a locked storage facility when not in use

    Correct Answer
    A. Maintained in an efficient state, in efficient working order and in good repair
    Explanation
    Regulation 5 of the Provision and Use of Work Equipment Regulations 1998 requires employers to ensure that work equipment is kept in a proper condition. This means that the equipment should be maintained regularly to ensure that it is functioning efficiently and effectively. It should be in good repair and working order so that it does not pose any risks or hazards to employees. This regulation emphasizes the importance of keeping work equipment in a safe and suitable condition to protect the health and safety of workers.

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  • 3. 

    The Health and Safety at Work Act places a duty of care on both employer and employee to ensure the safety of

    • All persons using the work premises

    • Only trades persons using the work premises

    • Members of the public using the work premises

    • Only company personnel using the work premises

    Correct Answer
    A. All persons using the work premises
    Explanation
    The Health and Safety at Work Act places a duty of care on both employer and employee to ensure the safety of all persons using the work premises. This means that both the employer and employee have a responsibility to take necessary measures to prevent any harm or injury to anyone who is present in the work premises, regardless of whether they are employees, tradespersons, members of the public, or company personnel. This ensures that everyone's safety is prioritized and protected in the workplace.

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  • 4. 

    When conducting a formal visual inspection on equipment used outdoors, it is important that the equipment has a suitable

    • IP Rating

    • GN Rating

    • IT Rating

    • GT Rating

    Correct Answer
    A. IP Rating
    Explanation
    When conducting a formal visual inspection on equipment used outdoors, it is important that the equipment has a suitable IP Rating. IP Rating stands for Ingress Protection Rating, which is a standard that indicates the level of protection the equipment provides against the intrusion of solid objects (such as dust) and liquids (such as water). The higher the IP Rating, the more resistant the equipment is to these environmental factors. Therefore, having a suitable IP Rating ensures that the equipment can withstand the outdoor conditions it will be exposed to, reducing the risk of damage or malfunction.

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  • 5. 

    Users of electrical equipment have responsibilities, which include ensuring the equipment they use has no obvious visual damage or defects. If a user becomes aware that the equipment they are using is defective, they should

    • Remove the equipment from service and report the defect

    • Remove the plug from the equipment to ensure that it cannot be used

    • Inform all potential users of the defect

    • Label the equipment as ‘Potentially Dangerous’

    Correct Answer
    A. Remove the equipment from service and report the defect
    Explanation
    The correct answer is to remove the equipment from service and report the defect. This is because if a user becomes aware that the equipment they are using is defective, it is important for them to remove it from service to prevent any potential harm or accidents. Additionally, reporting the defect is crucial as it allows the appropriate authorities or maintenance personnel to address the issue and take necessary actions to ensure the safety of other users.

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  • 6. 

    Which one of the following is the main reason for In-service inspection and testing of equipment?

    • Determining whether maintenance is required

    • Keeping an up-to-date list of materials

    • Monitoring borrowed equipment

    • Ensuring the equipment is the latest edition

    Correct Answer
    A. Determining whether maintenance is required
    Explanation
    The main reason for in-service inspection and testing of equipment is to determine whether maintenance is required. This process helps identify any potential issues or defects in the equipment that may require maintenance or repair. By regularly inspecting and testing the equipment, any necessary maintenance can be identified and performed promptly, ensuring the equipment's optimal performance and safety. This helps prevent any potential failures or accidents that may occur due to faulty equipment.

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  • 7. 

    Equipment that is found to be faulty must not be used but must be

    • Labelled, reported and withdrawn from service

    • Labelled and reported

    • Returned to the manufacturer

    • Reported to the responsible person

    Correct Answer
    A. Labelled, reported and withdrawn from service
    Explanation
    When equipment is found to be faulty, it is important to ensure that it is not used to prevent any potential harm or accidents. Therefore, the equipment should be labelled to indicate its faulty status, reported to the relevant authorities or responsible person, and ultimately withdrawn from service. This ensures that the faulty equipment is properly identified, reported, and taken out of use to maintain safety and prevent any further issues.

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  • 8. 

    A microwave oven that is functioning satisfactorily should be rejected if it

    • Is showing signs of damage, distortion or erosion

    • Takes longer than expected to warm food

    • Is over a certain age

    • Is missing it’s internal plate

    Correct Answer
    A. Is showing signs of damage, distortion or erosion
    Explanation
    A microwave oven that is showing signs of damage, distortion, or erosion should be rejected because these signs indicate that the oven is not functioning properly. Damage, distortion, or erosion can affect the performance and safety of the oven, potentially leading to further issues or even accidents. Therefore, it is important to reject a microwave oven with these signs to ensure the safety and functionality of the appliance.

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  • 9. 

    Which of the following equipment type is a welding set, which is on wheels and supplied by a 13 A plug?

    • Moveable

    • Stationary

    • Hand-held

    • Fixed Appliance

    Correct Answer
    A. Moveable
    Explanation
    A welding set that is on wheels and supplied by a 13 A plug is considered a movable equipment type. This means that it can be easily transported and used in different locations. The fact that it is on wheels suggests that it is designed to be portable and can be moved around as needed. Additionally, being supplied by a 13 A plug indicates that it can be plugged into a standard electrical outlet, further supporting the idea that it is a movable equipment type.

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  • 10. 

    An earth continuity test is to be carried out on Class I portable appliance with a supply cable. The test resistance measured must not exceed

    • 0.1 + R Ω

    • 0.1 - R Ω

    • 0.5 + R Ω

    • 0.5 - R Ω

    Correct Answer
    A. 0.1 + R Ω
    Explanation
    The correct answer is 0.1 + R Ω. In an earth continuity test, the resistance measured should not exceed a certain value. The given answer suggests that the maximum resistance allowed is 0.1 Ω plus the resistance of the appliance (R Ω). This means that the total resistance should not exceed 0.1 + R Ω.

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  • 11. 

    A means of isolating portable appliances should be readily accessible to

    • The user

    • Skilled persons

    • The manager

    • A keyholder

    Correct Answer
    A. The user
    Explanation
    The means of isolating portable appliances should be readily accessible to the user because they are the ones who will be using the appliances and may need to turn them off or disconnect them in case of emergencies or maintenance. It is important for the user to have easy access to the isolation point to ensure their safety and the proper functioning of the appliances. Skilled persons, the manager, or a keyholder may also need access to the isolation point, but it is primarily the responsibility of the user.

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  • 12. 

    The Code of Practice recognises a 'person with technical knowledge or sufficient experience to enable him/her to avoid the dangers that electricity may create' as a

    • Competent person

    • Experienced person

    • Trained person

    • Skilled person

    Correct Answer
    A. Competent person
    Explanation
    The Code of Practice defines a competent person as someone who possesses technical knowledge or sufficient experience to effectively mitigate the risks associated with electricity. This individual is capable of identifying and avoiding potential hazards, ensuring the safety of themselves and others. The term "competent person" implies a high level of expertise and understanding in electrical matters, making them qualified to carry out tasks related to electrical installations and maintenance.

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  • 13. 

    The most important check when assessing the level of safety of an electrical appliance would be

    • The visual inspection

    • The destruction test

    • Flash testing

    • Insulation resistance test

    Correct Answer
    A. The visual inspection
    Explanation
    The most important check when assessing the level of safety of an electrical appliance is the visual inspection. This involves examining the appliance for any visible signs of damage, such as frayed wires, loose connections, or burn marks. Visual inspection is crucial because it allows for the identification of potential hazards that could lead to electrical shocks or fires. It is a simple and effective way to assess the overall condition and safety of the appliance before further testing or use.

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  • 14. 

    Where The Provision and Use of Work Equipment Regulations 1998 states that equipment must be in an efficient state, the term ‘efficient’ is being used in the context of

    • Safety

    • Efficient use of power

    • Reliability

    • Ease of use

    Correct Answer
    A. Safety
    Explanation
    The term 'efficient' in the context of the Provision and Use of Work Equipment Regulations 1998 refers to the equipment being in a safe state. This means that the equipment should be functioning properly and not pose any risks or hazards to the users. The regulations aim to ensure that employers provide their workers with equipment that is safe to use and does not compromise their health and safety. Therefore, the term 'efficient' in this context emphasizes the importance of safety in relation to work equipment.

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  • 15. 

    The current drawn by an appliance is measured in

    • Amperes

    • Ohms

    • Volts

    • Watts

    Correct Answer
    A. Amperes
    Explanation
    The current drawn by an appliance is measured in Amperes. Amperes is the unit of electric current, which represents the rate of flow of electric charge. It is named after the French physicist André-Marie Ampère. The current drawn by an appliance refers to the amount of electric current that flows through it when it is in operation. By measuring the current in Amperes, we can determine the amount of electricity being consumed by the appliance.

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  • 16. 

    Where a formal visual inspection is carried out to a hand held appliance, which is known to be used outdoors, the inspector should check that the equipment is protected by an RCD with a residual current not exceeding

    • 30 mA

    • 100 mA

    • 300 mA

    • 500 mA

    Correct Answer
    A. 30 mA
    Explanation
    In this scenario, a formal visual inspection is being conducted on a hand-held appliance that is known to be used outdoors. The inspector's responsibility is to ensure the equipment is protected by an RCD (Residual Current Device) with a residual current not exceeding 30 mA. This is because RCDs are designed to detect and protect against electrical faults, such as leakage currents, which can be potentially dangerous. A residual current not exceeding 30 mA ensures that the RCD will quickly trip and disconnect the power supply if any fault is detected, minimizing the risk of electric shock or other hazards.

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  • 17. 

    The symbol which represents the power of an appliance supplied at a voltage of 230V is

    • W

    • Ω

    • A

    • KV

    Correct Answer
    A. W
    Explanation
    The symbol "W" represents the power of an appliance supplied at a voltage of 230V. The unit of power is watt, which is commonly used to measure the rate at which energy is consumed or produced by an electrical device. Therefore, "W" is the correct symbol to represent power in this context.

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  • 18. 

    The cross sectional area (csa) of a cable core is usually measured in

    • Mm2

    • Mm

    • M2

    • Cm

    Correct Answer
    A. Mm2
    Explanation
    The cross-sectional area (csa) of a cable core is usually measured in mm2 because it provides a more precise and accurate measurement. The use of millimeters squared allows for a more detailed understanding of the size and capacity of the cable core, especially in electrical and engineering applications where precision is crucial. Additionally, mm2 is a standard unit for measuring small areas, making it a widely accepted and recognized measurement in the field.

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  • 19. 

    When conducting an insulation resistance test on an electrical appliance, the voltage applied should be

    • 500 V DC

    • 230 V AC

    • 500 V AC

    • 240 V DC

    Correct Answer
    A. 500 V DC
    Explanation
    When conducting an insulation resistance test on an electrical appliance, the voltage applied should be 500 V DC. This is because DC voltage is more effective in detecting insulation faults compared to AC voltage. DC voltage allows for a steady and consistent flow of current, which helps to identify any weaknesses or breakdowns in the insulation. AC voltage, on the other hand, may cause the current to fluctuate, making it more difficult to accurately measure the insulation resistance. Additionally, a higher voltage of 500 V is typically used to ensure accurate and reliable results.

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  • 20. 

    For standardisation, if a 230V appliance possesses an input rating of 650 W then the correct fuse size for the 3 pin plug would be

    • 3 A

    • 5 A

    • 13 A

    • 65 A

    Correct Answer
    A. 3 A
    Explanation
    The correct fuse size for a 230V appliance with an input rating of 650W would be 3A. This is because the fuse size should be lower than the maximum current that the appliance can draw. To calculate the maximum current, we can use the formula P=VI, where P is the power in watts, V is the voltage in volts, and I is the current in amperes. Rearranging the formula to solve for I, we get I=P/V. Plugging in the values, we get I=650/230=2.83A. Since the fuse size should be lower than this value, the closest option is 3A.

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  • 21. 

    Many items of business equipment are connected to a UPS. UPS is an abbreviation of

    • Uninterruptible power supply

    • Universal power supply

    • Universal photovoltaic system

    • Undervoltage power system

    Correct Answer
    A. Uninterruptible power supply
    Explanation
    A UPS, or uninterruptible power supply, is a device that provides backup power to connected equipment in case of a power outage or fluctuation. It ensures uninterrupted power supply to critical business equipment, such as computers, servers, and networking devices. The other options, universal power supply, universal photovoltaic system, and undervoltage power system, do not accurately describe the purpose or function of a UPS.

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  • 22. 

    Certain electrical test equipment include a test facility that would not be recommended for in-service testing. The test facility that is not recommended is commonly known as

    • Flash testing

    • Low pot testing

    • High energy testing

    • Quick testing

    Correct Answer
    A. Flash testing
    Explanation
    Flash testing is a test facility that is not recommended for in-service testing. Flash testing involves applying a high voltage to an electrical component or system to check for any insulation breakdown or flashover. This test can be dangerous and can cause damage to the equipment being tested. Therefore, it is not recommended for in-service testing where the equipment is already in operation.

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  • 23. 

    One reason that a polarity check is made, is to ensure

    • That L & N are correctly connected

    • The appliance is earthed correctly

    • An extension lead is the correct length

    • The appliance functions correctly

    Correct Answer
    A. That L & N are correctly connected
    Explanation
    A polarity check is made to ensure that the live (L) and neutral (N) wires are correctly connected. This is important for the safe and proper functioning of electrical appliances. If the L and N wires are reversed, it can lead to potential hazards and malfunctioning of the appliance.

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  • 24. 

    Which of the following equipment type is an electric kettle supplied by a 13 A plug?

    • Portable

    • Hand-held

    • Transportable

    • Moveable

    Correct Answer
    A. Portable
    Explanation
    An electric kettle supplied by a 13 A plug is classified as portable because it can be easily moved or carried from one place to another. It is not hand-held, transportable, or moveable as these terms do not specifically refer to the ability to be powered by a 13 A plug.

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  • 25. 

    The MOST suitable method for testing equipment supplied by a BS 1363 plug is by means of

    • A dedicated portable appliance test instrument

    • An insulation resistance test instrument

    • An earth fault loop impedance tester

    • An RCD tester

    Correct Answer
    A. A dedicated portable appliance test instrument
    Explanation
    A dedicated portable appliance test instrument is the most suitable method for testing equipment supplied by a BS 1363 plug because it is specifically designed for testing portable appliances. This instrument can perform a variety of tests, including insulation resistance, earth continuity, and polarity checks, ensuring that the equipment is safe and in compliance with regulations. It provides a comprehensive assessment of the appliance's electrical safety, making it the ideal choice for testing equipment with a BS 1363 plug.

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  • 26. 

    Prior to applying insulation resistance tests to electrical equipment, the

    • Fuses should be checked, switches should be in the On position and covers in place

    • Switches should be in the ON position and all covers removed if possible

    • Switches should be in the OFF position and all covers in place

    • Fuses should be checked, switches should be in the OFF position and covers removed if possible

    Correct Answer
    A. Fuses should be checked, switches should be in the On position and covers in place
    Explanation
    Before conducting insulation resistance tests on electrical equipment, it is important to ensure that the fuses are checked to ensure they are functioning properly. Additionally, the switches should be in the On position to allow the flow of electricity through the equipment. Lastly, the covers should be in place to protect against any potential hazards. This combination of actions ensures that the equipment is ready for testing and that safety measures are in place.

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  • 27. 

    Regulation 12 of the Electricity at Work Regulations 1989 deals with

    • Persons to be competent to prevent danger and injury

    • Strength and capability of electrical equipment

    • Means of cutting off the supply and for isolation

    • Working space, access and lighting

    Correct Answer
    A. Persons to be competent to prevent danger and injury
    Explanation
    Regulation 12 of the Electricity at Work Regulations 1989 deals with persons to be competent to prevent danger and injury. This means that the regulation outlines the requirements for individuals working with electrical equipment to have the necessary knowledge, skills, and training to ensure the safety of themselves and others. It emphasizes the importance of competency in preventing potential dangers and injuries that may arise from working with electricity.

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  • 28. 

    A conductor having a cross-sectional-area (csa) of 4 mm2 has a resistance of 0.2 Ω. If the csa was halved, the resistance would be

    • 0.4Ω

    • 0.2 Ω

    • 0.8 Ω

    • 0.6Ω

    Correct Answer
    A. 0.4Ω
    Explanation
    When the cross-sectional area (csa) of a conductor is halved, the resistance of the conductor doubles. This is because resistance is inversely proportional to the cross-sectional area of the conductor. Therefore, if the initial resistance of the conductor is 0.2 Ω, halving the csa would result in a resistance of 0.4 Ω.

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  • 29. 

    An electric shock will result from contact with an exposed-conductive-part made live by a fault. This occurs due to a failure of

    • Fault protection

    • Safety protection

    • Basic protection

    • Barrier protection

    Correct Answer
    A. Fault protection
    Explanation
    The correct answer is fault protection. An electric shock can occur when there is a fault in the electrical system, causing an exposed-conductive-part to become live. Fault protection refers to the measures and devices in place to detect and respond to faults in the system, such as circuit breakers or ground fault circuit interrupters. If the fault protection measures fail to respond to the fault, the exposed-conductive-part can remain live and pose a risk of electric shock to anyone coming into contact with it.

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  • 30. 

    A standard 13 A plug is fitted with a fuse in order to

    • Protect the flexible cord

    • Protect the socket outlet

    • Protect the appliance

    • Protect the plug from overheating

    Correct Answer
    A. Protect the flexible cord
    Explanation
    A standard 13 A plug is fitted with a fuse to protect the flexible cord. The fuse acts as a safety mechanism that will blow or melt if there is an excessive amount of current flowing through the cord. This helps to prevent the cord from overheating and potentially causing a fire or electrical hazard. By protecting the flexible cord, the fuse ensures the safe operation of the appliance and reduces the risk of damage or injury.

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  • 31. 

    The suggested initial frequency for combined inspection and testing of Class II Information Technology equipment used in schools is

    • OneYear

    • TwoYears

    • ThreeYears

    • Four Years

    Correct Answer
    A. OneYear
    Explanation
    The suggested initial frequency for combined inspection and testing of Class II Information Technology equipment used in schools is OneYear. This means that it is recommended to inspect and test the equipment annually to ensure its safety and proper functioning. Regular inspection and testing help identify any potential hazards or faults in the equipment, allowing for timely repairs or replacements. By conducting these activities every year, schools can ensure the safety of their students and staff and maintain the efficiency of their IT equipment.

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  • 32. 

    The user of an item of electrical equipment should have the competency to inspect

    • The socket outlet

    • The equipment fuses

    • The internal insulation

    • The protective conductors

    Correct Answer
    A. The socket outlet
    Explanation
    The user of an item of electrical equipment should have the competency to inspect the socket outlet because it is important to ensure that the outlet is in proper working condition and free from any damage or faults. This inspection is necessary to prevent any electrical hazards or accidents that could occur due to faulty outlets. By inspecting the socket outlet, the user can identify any issues such as loose connections, damaged wiring, or signs of overheating, and take appropriate action to rectify the problem or seek professional help if required.

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  • 33. 

    A test result of 0.05 MΩ is returned from an insulation resistance test on a Class I appliance. If the appliance is connected to a 230V supply, the value of current that would leak to earth would be

    • 1.0 mA

    • 6.4 mA

    • 4.6 mA

    • 5.2 mA

    Correct Answer
    A. 4.6 mA
    Explanation
    The insulation resistance test measures the resistance between the live parts of the appliance and the earth. A result of 0.05 MΩ indicates that the insulation is in good condition. According to Ohm's Law (V = IR), if the appliance is connected to a 230V supply, the current that would leak to earth can be calculated by rearranging the equation to I = V/R. Plugging in the values, we get I = 230V / 0.05 MΩ = 4.6 mA. Therefore, the correct answer is 4.6 mA.

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  • 34. 

    The Electricity at Work Regulations apply to

    • All electrical equipment

    • Electrical equipment in the workplace only

    • Electrical equipment supplied at voltages of less than 1000 V a.c. only

    • Portable electrical appliances only

    Correct Answer
    A. All electrical equipment
    Explanation
    The Electricity at Work Regulations apply to all electrical equipment, not just specific types or voltages. This means that the regulations cover all electrical equipment in any setting, including workplaces, regardless of the voltage level or whether it is portable or not. The regulations aim to ensure the safety of individuals working with or near electrical equipment by providing guidelines and requirements for its installation, maintenance, and use.

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  • 35. 

    Which one of the following is the MOST important reason for maintain test instrument records

    • Assessing on-going accuracy of test instruments

    • To keep results of the tests that the instrument may perform

    • To keep the instrument’s warranty valid

    • To keep a track of the instrument’s location and user

    Correct Answer
    A. Assessing on-going accuracy of test instruments
    Explanation
    Maintaining test instrument records is important for assessing the ongoing accuracy of the instruments. By keeping records of the tests performed with the instrument, any deviations or changes in accuracy can be identified and addressed. This helps ensure that the instrument is providing accurate and reliable results, which is crucial for any testing or measurement process.

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  • 36. 

    A record of user checks is required

    • After each check

    • Every six months

    • Where faults are found

    • Quarterly

    Correct Answer
    A. After each check
    Explanation
    The correct answer is "After each check" because the statement mentions that a record of user checks is required. This implies that after each check, a record needs to be made.

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  • 37. 

    Regulation 9 of PUWER requires employers to ensure that all persons who use work equipment have received adequate training for purposes of

    • Health and safety

    • Electrical safety

    • An efficient workplace

    • Legal compliance

    Correct Answer
    A. Health and safety
    Explanation
    Regulation 9 of PUWER requires employers to ensure that all persons who use work equipment have received adequate training for purposes of health and safety. This means that employers have a legal obligation to provide training to their employees to ensure their health and safety while using work equipment. This training is necessary to minimize the risk of accidents, injuries, and health hazards that may arise from the use of work equipment. It also helps employees understand and comply with the relevant health and safety regulations and guidelines.

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  • 38. 

    The minimum value produced from an insulation resistance test on a Class I appliance not exceeding 3 kW would be

    • 0.3 MΩ

    • 0.1 MΩ

    • 100 MΩ

    • 1000 MΩ

    Correct Answer
    A. 0.3 MΩ
    Explanation
    The minimum value produced from an insulation resistance test on a Class I appliance not exceeding 3 kW would be 0.3 MΩ. This is because the insulation resistance test is conducted to measure the effectiveness of the insulation in preventing electrical leakage. A higher resistance value indicates better insulation. In this case, a value of 0.3 MΩ is considered the minimum acceptable value for a Class I appliance not exceeding 3 kW.

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  • 39. 

    Extensive repairs or refurbishment undertaken on any item of equipment means that it may need to be subjected to

    • Production testing

    • Environmental testing

    • Type testing

    • Flash testing

    Correct Answer
    A. Production testing
    Explanation
    When extensive repairs or refurbishment are done on any equipment, it is important to subject it to production testing. This is because production testing ensures that the equipment is functioning properly and meets the required standards after the repairs or refurbishment. It helps to identify any potential issues or defects that may have arisen during the repair process and ensures that the equipment is safe and reliable for use in production.

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  • 40. 

    Certain regulations in the Electricity at Work Regulations are particularly important to the issues surrounding in-service inspection and testing. One of these is Regulation 14 which concerns

    • Work on or near live conductors

    • Systems, work activities and protective equipment

    • Precautions for work on equipment made dead

    • Means of cutting off the supply and for isolation

    Correct Answer
    A. Work on or near live conductors
    Explanation
    Regulation 14 in the Electricity at Work Regulations is specifically related to work on or near live conductors. This regulation outlines the necessary precautions and safety measures that need to be taken when working with live electrical conductors. It emphasizes the importance of understanding the risks and implementing protective equipment to ensure the safety of individuals involved in such work. By adhering to Regulation 14, organizations can ensure that proper measures are in place to prevent accidents and injuries when working with live conductors.

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  • 41. 

    Insulation resistance measurements are displayed in

    • MΩ

    • KΩ

    • Ω

    • MΩ

    Correct Answer
    A. MΩ
    Explanation
    Insulation resistance measurements are displayed in milliohms (mΩ). This unit is used to measure the resistance of insulation materials, such as wires or cables, to the flow of electrical current. Insulation resistance is an important parameter in electrical systems as it indicates the effectiveness of the insulation in preventing leakage current. By measuring the insulation resistance in milliohms, engineers and technicians can assess the quality and condition of the insulation and identify any potential issues or faults.

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  • 42. 

    The type of equipment used in shops and offices that is most likely to develop a serious fault is

    • Handheld

    • Portable

    • Built in

    • Movable

    Correct Answer
    A. Handheld
    Explanation
    Handheld equipment is most likely to develop a serious fault compared to other types of equipment used in shops and offices. This is because handheld devices are often subjected to frequent and rough handling, increasing the chances of accidental drops, impacts, or other physical damage. Additionally, handheld equipment typically has more complex internal components and circuitry, making them more susceptible to technical failures or malfunctions. Therefore, the nature of handheld equipment and its exposure to physical and technical risks make it more prone to developing serious faults.

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  • 43. 

    A portable appliance test instrument (PAT) may be used to test earth continuity. Another test instrument that could be uses is

    • A low resistance ohmmeter

    • An earth loop impedance tester

    • An earth electrode resistance tester

    • An insulation resistance tester

    Correct Answer
    A. A low resistance ohmmeter
    Explanation
    A low resistance ohmmeter can be used to test earth continuity in addition to a portable appliance test instrument (PAT). A low resistance ohmmeter measures the resistance of the earth connection to ensure that it is within acceptable limits. This test is important to ensure that there is a low resistance path for electrical faults to be safely conducted to the earth, preventing the risk of electric shock or damage to the equipment. Therefore, a low resistance ohmmeter is a suitable alternative instrument for testing earth continuity.

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  • 44. 

    Which one of the following is detailed in L21 Approved Code of Practice published by the HSE?

    • Electricity at Work Regulations

    • Management of Health and Safety at Work

    • Workplace (Health, Safety and Welfare) Regulations

    • Provision and Use of Work Equipment

    Correct Answer
    A. Electricity at Work Regulations
    Explanation
    The L21 Approved Code of Practice published by the HSE provides detailed guidance on the Electricity at Work Regulations. This code of practice outlines the legal requirements and best practices for ensuring the safety of electrical systems and equipment in the workplace. It covers topics such as electrical installations, maintenance, testing, and inspection procedures to prevent electrical accidents and injuries.

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  • 45. 

    A substantially continuous metal enclosure around Class II equipment is classified as

    • Double insulated

    • Metal-encased

    • Metal enclosed

    • Metal inside

    Correct Answer
    A. Double insulated
    Explanation
    A substantially continuous metal enclosure around Class II equipment is classified as "double insulated" because it provides an extra layer of insulation to protect against electric shock. The metal enclosure acts as a second barrier, in addition to the primary insulation, to prevent any contact with live parts. This design ensures an added level of safety for the equipment and its users.

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  • 46. 

    The result from an earth continuity reading performed on an extension lead with a cross-sectional area of 1.5 mm2 and also a length of 20 m should be approximately

    • 0.266 Ω

    • 0.226 Ω

    • 0.236 Ω

    • 0.199 Ω

    Correct Answer
    A. 0.266 Ω
    Explanation
    The result from an earth continuity reading performed on an extension lead with a cross-sectional area of 1.5 mm2 and a length of 20 m should be approximately 0.266 Ω. This can be determined using the formula for resistance, which states that resistance is equal to resistivity multiplied by length divided by cross-sectional area. In this case, the resistivity of the material is not given, so we assume it to be a standard value. By plugging in the given values into the formula, we can calculate the approximate resistance to be 0.266 Ω.

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  • 47. 

    Where equipment has a protective conductor current designed to exceed 3.5 mA a label should be fixed adjacent to the equipment’s primary power connection with the wording

    • WARNING: HIGH PROTECTIVE CONDUCTOR CURRENT, earth connection essential before connecting the supply

    • WARNING: HIGH TOUCH CURRENT, earth connection essential before connecting the supply

    • WARNING: HIGH CURRENT, earth connection essential before connecting the supply

    • WARNING: HIGH VOLTAGE APPLIANCE, earth connection essential before connecting the supply

    Correct Answer
    A. WARNING: HIGH PROTECTIVE CONDUCTOR CURRENT, earth connection essential before connecting the supply
    Explanation
    The correct answer is "WARNING: HIGH PROTECTIVE CONDUCTOR CURRENT, earth connection essential before connecting the supply." This label is necessary because the equipment has a protective conductor current that is designed to exceed 3.5 mA. This warning is important to ensure the safety of individuals who are connecting the equipment to the power supply. It alerts them to the presence of a high protective conductor current and emphasizes the need to establish an earth connection before connecting the supply to prevent any potential electrical hazards.

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  • 48. 

    Where an item of Class II equipment does not have any form of a control device, the maximum protective conductor current is

    • 0.25 mA

    • 0.50 mA

    • 0.75 mA

    • 0.95 mA

    Correct Answer
    A. 0.25 mA
    Explanation
    The maximum protective conductor current for an item of Class II equipment that does not have any form of a control device is 0.25 mA. This means that the current flowing through the protective conductor, which is designed to protect against electric shock, should not exceed 0.25 mA in this particular scenario.

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  • 49. 

    If an earth continuity test was carried out on a 25 m extension lead which has a core area of 2.5 mm2, the approximate result produced would be

    • 0.2 Ω

    • 2.0 Ω

    • 2.2 Ω

    • 0.5 Ω

    Correct Answer
    A. 0.2 Ω
    Explanation
    The approximate result produced would be 0.2 Ω because the earth continuity test measures the resistance of the earth conductor. The resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area. Since the length of the extension lead is given as 25 m and the core area is given as 2.5 mm2, the resistance can be calculated using the formula R = ρ * (L/A), where ρ is the resistivity of the material (assumed to be constant), L is the length, and A is the cross-sectional area. As the length is increased, the resistance increases, but as the cross-sectional area is increased, the resistance decreases. Therefore, with a longer length and smaller cross-sectional area, the resistance would be higher, hence the answer is 0.2 Ω.

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  • Aug 05, 2024
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