28/03/2020 Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Surge arresters aboard marine are used for the protection of GeneratorsMotorsAll components and switch gearsTransformers2. Electro-mechanical breakdown of solid insulating materials occurs due to VibrationsElectrical stresses produced by the voltage fluctuations.Mechanical stresses produced by the electrical fieldMagnetic bum3. A material through which electric current CANNOT pass easily is a/an ____________________ReceptorInsulatorTesterConductor4. If the current equals to 14 A and the resistance is 3 Ω, what is the voltage of the battery?4.66 V10 A3 V42 V5. Christmas tree lights are often connected in series. This is not a good idea becauseThey aren't colorfulThey use more energyThere isn't a complete circuitIf one light breaks they all go out6. Insulation and vibration testing are part of ..... Planned maintenanceBreak down maintenanceCondition monitoring7. What do you do if you hang your Christmas lights and you have a female plug at the end by the outlet?Buy a male/female adapter.Buy a double male adapter.Buy a double female adapter.Take down the lights and restring them.8. A fine wire that becomes hot and produces light when an electric current passes through it is called a _________________. FilamentCircuitNichrome wireWire9. An outlet where one or more receptacles are installed. WatertightOutletApprovedReceptacle Outlet10. What is the resistance in the circuit that is connected to a 63 V battery, and is measured to have a current of 9 A.10 A63 Ω657 Ω7 Ω11. The medium employed for the extinction of arc in air circuit breaker is SF6WaterOilAir12. A screw or a quick-connect device where a conductor(s) is intended to be connected.WatertightSurge SuppressorTerminalThermopile13. Conductive articles of jewelry and clothing may be worn around exposed energized parts.FalseTrue14. Surge voltage originate in power systems due to LightningAll of the aboveFaultsSwitching operations15. Infrared Thermography inspection (IRT) cannot help in detecting..... Energised ground cables, open circuits and short circuitsDynamic unbalance of a rotating machineHigh electrical resistance and high loading16. In the picture, what does the short line represent? Electron portion of cellElectron portion of batteryA batteryProton portion of cell17. Safety-related work practices involve: The use of ground fault circuit interruptersVerifying power is off before doing repairsKeeping proper distance from overhead power linesAll of the above18. Electric cords connected to equipment may be used for raising or lowering the equipment.FalseTrue19. Current is the amount of energy provided by the circuit, increasing this made the electrons travel faster. TrueFalse20. You have a bad breaker in your panel box, so you go down to the hardware store and the guy tells you that you can use any kind of breaker as long as it's the same amperage.FalseTrue21. The type of earthing arrangements requiring a consumer's earth electrode to be installed is where The electrical system is TN-CEarthing is via the distributor’s cable armourNo earth facility is supplied by the distributorThe supply is from a low voltage generator22. Reaction to static electric shock may cause injury.TrueFalse23. Small wires can easily puncture the skin. FalseTrue24. What does each colour represent in 4-conductor electrical wire? Red=ground, Black=neutral, White=hot, Green=hotRed=neutral, Black=hot, white=ground, green=hotRed=hot, Black-ground, White=hot, Green=neutralRed=hot, Black=hot, white=neutral, green=ground25. The size of an electric shock current is related to the...... Applied voltageBody resistanceBoth applied voltage and body resistance26 out of 25Time is Up! Time's up
