Electrical Apprenticeship Technology 2 (T2) Phase 4 Practice Exam

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• How does the mechanical strength of aluminium compare to copper?
• Which statement is true about STP Cat6 cable construction?
• Define luminous intensity and state its unit.
• Which item is NOT listed as a main component of a self-contained lighting luminaire?
• During quarterly testing, how long should a 3-hour emergency lighting system be simulated for?
• Which statement best describes common causes of insulation failure and prevention?
• Which device is used to connect a motor to its load while allowing for misalignment?
• In the sequence of storage heater supply control, when should supply be allowed?
• Which device is typically used to interrupt fault currents in a branch circuit to protect conductors?
• In a parallel circuit, how does the voltage across each branch compare to the source, and how does the total current behave?
• What is Ohm's Law in its common form for calculating voltage?
• On an analogue day-and-night kWh meter, which dial shows the day reading?
• Which conduit type is most suitable for outdoor industrial settings requiring maximum mechanical protection?
• In EMI-prone industrial buildings, which data cable is typically used?
• A popular S plan arrangement uses four valves: one for hot water, one for upstairs heating, one for downstairs heating, and one for a conservatory. Which valve corresponds to the conservatory?
• Distinguish between a bonding jumper and a grounding electrode conductor; what is each used for?
• What is the primary purpose of main bonding in an electrical installation?
• What type of meter is used to bill energy for electric storage heaters in a domestic premises?
• Which statement describes the lamp's battery sufficiency for rated duration?
• Which of the following is NOT typically considered when selecting conductor size for a given load?
• For an underfloor/raised busbar system, what is a typical maximum distance for tap-off points?
• What factor can affect readings of a clamp-on ammeter?
• Why is a choke not required in high pressure MBFT lamps?
• What is the outer jacket material of LiYCY typically described as?
• What is a GFCI and where is it required by code?
• In an agricultural installation using SWA, which statement is true about protective conductors?
• Which of the following is NOT listed as an advantage of storage heaters?
• LED lamps typically have what level of color rendering (CR)?
• Which of the following is a type of switch commonly used for remote control in lighting strategies?
• Why do supply authorities offer off-peak electricity rates?
• Which device can be reset after tripping?
• In the sequence of operations for electrical installation, when should visual inspection be performed?
• Which statement about Irish standard compliance for escape lighting is true?
• What is the purpose of surge protection devices and where are they installed?
• What documentation is typically completed after an emergency lighting test?
• What type of meter is used to bill energy consumed by electric storage heaters in a domestic premises?
• Differentiate between branch circuits and feeders.
• Which statement describes the shielding in LiYCY?
• Which device is commonly used to protect a heating circuit from overheating?
• Which statement correctly describes typical pre-made rolls of electric radiant flexible sheet underfloor heating?
• What is a holding contact and what is its purpose in motor control?
• What is standby lighting?
• Which component stores energy for a self-contained luminaire?
• Which practice best describes proper labeling and tagging for electrical installations?
• Which statement about arc flash hazard is true?
• Why is lockout/tagout important for electrical maintenance?
• Luminous flux is defined as what?
• LED lamps run up to full output immediately when turned on.
• Cat 5 unshielded twisted pair cables (UTP) consist of how many pairs?
• Why are fuses sized in branch circuits?
• Stand-alone automatic lighting control system: one disadvantage.
• What is the purpose of the NEC in electrical installations?
• What are the typical functions of a digital multimeter?
• Which statement about rising main busbar systems is true?
• In a series circuit, how does adding resistance affect total resistance and circuit current?
• Which of the following is a design consideration for a lighting control strategy in a commercial building?
• In a fan assisted night storage heater, where is the fan circuit connected?
• If a resistor is removed from a series circuit, what happens to total resistance and circuit current?
• What is the purpose of a High Breaking Capacity fuse?
• What is a disadvantage of electric floor warming systems?
• Which of the following is a precaution when installing Cat5 cables?
• In the RCD rating 32 A, 30 mA, AC, what does AC denote?
• What defines a combined sustained emergency luminaire?
• What is arc flash and what steps reduce risk to workers?
• In the same RCD rating 32 A, 30 mA, AC, what does the 30 mA indicate?
• What is the minimum burial depth for a non-armoured cable installed in soil?
• Which control is used for occupancy-based automatic extinction of lighting?
• Tap-off units in an underfloor/raised busbar system are commonly rated at which values?
• Which control is used to dim lights when daylight is available?
• Compare conduit types for typical indoor and outdoor applications.
• In addition to V_source and Z_fault, which data is recommended to refine I_sc estimation?
• Which battery type is 50-60% lighter than lead-acid batteries?
• Which statement best differentiates a fuse switch from a switch fuse?
• What unit is used to measure luminous flux?
• How is storage heater usage controlled and monitored by the electricity supplier?
• What is a common consequence of incorrect grounding in a distribution system?
• How does voltage drop calculation differ between single-phase and three-phase circuits?
• In a contactor, what does energizing the coil do?
• Which of the following is NOT listed as an advantage of rising main busbar systems in multi-storey buildings?
• What is the difference between a circuit breaker and a fuse?
• Which statement describes an advantage of using a flexible coupling to connect a motor to its load?
• How do balanced and unbalanced circuits affect instrumentation?
• How do you estimate short-circuit current at a service entrance?
• What is the purpose of grounding rods and bonding jumpers in a distribution system?
• Which feature best facilitates daylight harvesting by adjusting electric lighting in response to natural light?
• What is power factor and why is it important in AC systems?
• Without expansion joints what issue can occur at busbar connections?
• How many pairs are contained in an STP Cat6 cable?
• Which statement describes an instantaneous overcurrent protection device?
• In three-phase calculations, which factor introduces the difference from single-phase results?
• Which statement best describes the effect of lagging power factor on system capacity?
• What is the primary purpose of an HBC fuse?
• Which of the following is a precaution when installing electric storage heaters?
• What does SCCR stand for and why is it critical in electrical design?
• Distinguish grounding from bonding in electrical systems.
• Which precaution helps protect data cabling from electromagnetic interference?
• What charging method is used for valve-regulated lead-acid (VRLA) batteries?
• During a typical daily load curve for electricity, when does demand peak?
• Which four items are listed as the main components of a self-contained lighting luminaire?
• Which construction accurately describes STP (shielded twisted pair) cable?
• Compared with copper, aluminium has which characteristic regarding conductivity?
• What is power factor correction and when is it typically used?
• Which term describes creating a low-impedance path between metal parts to prevent shock?
• Which conduit type is a rigid metal option suitable for straight indoor runs?
• In MBF lamp operation, what is the purpose of the discharge process?
• Which function checks the lamp will strike correctly on power failure?
• What does the short-circuit current rating determine in equipment design?
• Compared to Ni-Cd batteries, which description of lead-acid batteries is accurate?
• What is the difference between a schematic diagram and a wiring diagram?
• Which PPE is recommended when testing lead-acid batteries used for large diesel generators?
• Addressable lighting control system: one disadvantage.
• During testing, what should LED status indicators be doing?
• What is voltage drop and why is it important in branch circuit design?
• What is the function of a protective relay in electrical systems?
• What are the two basic functions of flexible couplings?
• What is the primary reason for using a clamp-on ammeter rather than breaking the circuit to measure current?
• Which expression correctly describes impedance magnitude?
• What is luminous flux and its SI unit?
• In three-phase circuits, which voltage is typically used in voltage drop calculations?
• What tools are used to check the alignment of shafts in a solid coupling?
• One type of cable suitable for installation in soil with a high impact resistance pipe in an industrial or commercial building and state minimum burial depth?
• In a parallel circuit, what happens to the equivalent resistance when another branch is added?
• What condition can cause electrolytic corrosion between copper and aluminium connections?
• Which component contributes to LiYCY's flexibility?
• Describe a ladder logic diagram and its main components.
• When calculating short-circuit current at a service entrance, which statement is recommended?
• In an MBF lamp, where does discharge occur and how long does it take to reach full light output?
• How does insulation temperature rating affect conductor ampacity?
• In ladder logic, how is a simple start/stop circuit with an emergency stop implemented?
• In agricultural installations using SWA, what protective-conductor requirement must be observed?
• Describe the construction of a lead-acid battery.
• Why can't Cat5e and Cat6 be used in the same installation?
• LiYCY is used in EMI environments because of what combination?
• In a night storage heating system, which device is used to regulate the room temperature?
• What is the function of an equipment grounding conductor and how is it sized?
• Where would a thermistor be located in the overcurrent protection circuit of a 3-phase induction motor?
• Why are expansion joints fitted on a busbar system?
• Stand-alone automatic lighting control system: one advantage.
• What is a VFD and how does it affect motor starting current and speed control?
• Which statement correctly describes thermal overload protection in relation to instantaneous overcurrent protection?
• What is the minimum size of the main bonding conductor acceptable in a domestic installation?
• What is a control relay and how does it contribute to sequencing in a control circuit?
• In a parallel circuit, if one branch opens, what happens to the total current from the source?
• Why is steel wire armour (SWA) not used as the protective conductor in agricultural cable installations?
• What is an advantage of a power track system?
• Define impedance in an AC circuit and explain its components.
• MBF/MBI lamps are typically used in which lighting application?
• What does SWA stand for in cable terminology?
• What is an advantage of electric floor warming systems?
• Under which circumstances should insulation resistance testing be performed on cables or equipment?
• What is the role of a contactor in motor control?
• Where should the room thermostat be located for an underfloor heating installation?
• Which expression correctly describes the secondary voltage in terms of primary voltage and the transformer turns ratio?
• Why are high breaking capacity fuses (HBC fuses) used in conjunction with MCBs?
• Why is arc flash PPE and safe distance essential for electrical workers?
• Which statement about overhead busbar trunking systems is true?
• An RCD is rated 32 A, 30 mA, AC. What does the 32 A rating indicate?
• Which instrument is used to measure current without breaking the circuit, and what is a limitation of this instrument?
• What term is used to describe the coupling procedure when connecting a motor to its load on the same bed plate, and how is the result checked?
• Where is the temperature probe typically installed for underfloor heating mats?
• What does normally open mean in a ladder logic contact?
• Which conduit type is nonmetallic and corrosion-resistant?
• What is an electrical overload relay and what does it protect?
• Where is a thermistor typically placed in a 3-phase motor’s overcurrent protection circuit?
• What material stores heat in night storage heaters and what precaution is taken when mounting these?
• Typically how many fire brick blocks are used in a storage heater?
• What term describes a rigid coupling used when machines share the same bed plate?
• In a fan-assisted night storage heater, what feature boosts daytime heat output?
• Which three factors affect power losses in cables due to conductor resistance heating?
• Combined sustained emergency luminaire contains what configuration?
• What feature provides EMI shielding in LiYCY cable?
• Which battery chemistry uses constant-current charging and is resistant to overcharging?
• What device is installed by the supply authority to monitor off-peak usage for storage heaters?
• A Cat 5 UTP cable has which of the following features?
• Why should storage heaters not rest on carpet and must be on the floor?
• Emergency lighting tests: what is performed for quarterly and annual tests?
• Which steps should you take to safely troubleshoot a no-power condition at a panel?
• What does the damper control on a storage heater regulate?
• In an S plan heating system, what is required for each separate zone?
• According to the described daily load curve, when is electricity demand typically at its lowest?
• Why might a thermostat require a neutral wire?
• To carry the same current as copper, aluminium conductor requires what characteristic?
• Which function is described as simulating a failure for set periods of time to evaluate performance?
• What is the purpose of voltage drop limits in conductor sizing?
• Lead-acid batteries are commonly used in which applications?
• Which of the following is a valid method of providing mechanical protection to cables that might be subjected to impact?
• How is reactive power calculated and what does it represent?
• What is the typical luminous efficacy range for MBF/MBI lamps?
• Which of the following are factors for emergency lighting compliance?
• How is a basic continuity check performed?
• HBC stands for which term in electrical protection?
• Which statement describes a typical reason MBIs are suitable for high bay industrial installations?
• Which statement best contrasts central battery systems with self-contained emergency lighting systems?
• Compared with fluorescent lamps, LED lamps generally have higher efficacy.
• Which is a primary purpose of labeling and tagging in electrical installations?
• What is an advantage of overhead busbar or power track trunking systems in industrial installations?
• When installing large cables in an underground duct with bends, which precaution should be taken to ensure a safe installation?
• Which precaution is recommended when installing electric storage heaters?
• Which function describes a test facility's ability to simulate outages for set periods of time?
• What material stores heat in storage heaters?
• What can happen to a busbar due to excessive heat?
• Addressable lighting control system: one advantage.
• Illuminance is defined as what quantity?
• Which statement about XLPE cables compared to PVC cables is correct?
• In a series circuit, how does the current through each component relate to the others?
• What is fault current and how is it used in selecting protection?
• Why must a motor contactor coil voltage match the control circuit voltage rating?
• Which sequence describes removing and replacing a worn bearing in a motor?
• How is conduit fill calculated and why is it important?
• Which of the following is a precaution when handling VRLA batteries during installation?