Single wire circuits Answer: A Explanation: Two or three single-pole switches or breakers capable of individual operation shall be permitted on multiwire circuits, one pole for each ungrounded conductor, as one multipole disconnect, provided they are equipped with identified handle ties or a master handle to disconnect all ungrounded conductors with no more than six operations of the hand. For example, tests used by the fire service tend to frame the questions in terms of fire-fighting whereas tests used to select for an aircraft maintenance job would tend to frame the questions in aviation industry terms. Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions. If you are taking a technical aptitude test as part of the selection for a craft or apprenticeship job, then you may be asked some questions about tools and how they are used. State exams cover such areas as Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. Based on this one measurement, we are able to determine that there is definitely a problem in the circuit somewhere on the left-hand side from points C and H, left. Spending lots of time learning to troubleshoot a circuit such as this will be greatly beneficial in the future! A manually operated device used in conjunction with a transfer switch to provide a means of directly connecting load conductors to a power source and of disconnecting the transfer switch.
There are several strategies which may be employed to find the location of the problem in this circuit. For those having difficultly understanding this, test the following statements for truth. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage. Answer: A Explanation: A device designed to close, open, or both, one or more electrical circuits. Answer: B Explanation: Motor Control Center. Answer: A Explanation: Metal-Enclosed Power Switchgear is a switchgear assembly completely enclosed on all sides and top with sheet metal except for ventilating openings and inspection windows and containing primary power circuit switching, interrupting devices, or both, with buses and connections.
This is known as Voltage to Ground 585. Receptacle Outlet Answer: A Explanation: Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions. There may or may not be a problem on the right-hand side of the circuit, as well. Expulsion Fuse Unit Answer: A Explanation: A vented, non vented, or controlled vented fuse unit in which the arc is extinguished by being drawn through solid material, granular material, or liquid, either alone or aided by a spring. This is known as: A.
Switch 1 is able to control lamp 1, but lamp 2 never comes on no matter what is done with switch 2: Identify which of these hypothetical faults could account for this problem, and which could not account for the problem. When sizing conductors and overcurrent protection for the fixed outdoor equipment you must take into consideration the equipment can operate over 3 hours, so it is considered a continuous load. This corroded connection now has a high resistance instead of a low resistance as it should. This is because when a fault develops in an electronically controlled system, there is often no physical clue as to the cause. The reason technicians and engineers are likely to encounter this type of test is that in their profession they can often come across problems which do not have an obvious cause.
For example, an insulation failure in an electrical circuit of a water heater could energize the metal water piping. Access to the interior of the enclosure is provided by doors, removable covers, or both. An assembly of one or more enclosed sections having a common power bus and principally containing motor control units. Good troubleshooters are rare, and in my opinion that has more to do with the lack of effective technical education than it does a lack of natural ability. This switch is called: A. Faulty device is it operating functionally — opens and closes 4.
As applied to an electric controller, non automatic control does not necessarily imply a manual controller, but only that personal intervention is necessary. Answer: D Explanation: An arrangement of incandescent lamps, electric-discharge lighting, or other electrically powered light sources to outline or call attention to certain features such as the shape of a building or the decoration of a window. The following circuit has a problem. Im guessing you won't be able to take the covers off anyway, because then you'll more than likley be able too see the fault. Over estimate Answer: A Explanation: Any current in excess of the rated current of equipment or the ampacity of a conductor. A premises wiring system whose power is derived from a source of electric energy or equipment other than a service.
Answer: C Explanation: Multioutlet Assembly is a type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory. Device operated Answer: A Explanation: A building or structure disconnecting means shall be located in accordance with 225. Only further investigation will reveal the truth. Start practicing and preparing today and ensure your success. The total components and subsystems that, in combination, convert solar energy into electric energy suitable for connection to a utilization load.
Troubleshooting journals such as this are helpful when searching for complex problems in large systems, where more than one person may have to work on finding the problem s. Answer: C Explanation: Interrupting Rating is the highest current at rated voltage that a device is intended to interrupt under standard test conditions. The contrapositive of this rule, however, is a valuable troubleshooting tool: if there is substantial voltage measured between two points in a circuit, then we know without a doubt that those two points are not electrically common to each other! Supplementary Over current Protective Device B. During an electrical assessment, you are most likely to encounter a range of different questions, including: simple circuits, electrical symbols, voltages, resistance, resistors, measurements, signal flow, Ohm's Law, ammeter, diodes, currents etc. Incorrect answer, please choose another answer.
This is known as: A. A fault, such as a short circuit or ground fault, is not an overload. Notes: Circuit troubleshooting is the highest level of thinking required of many electrical and electronics professionals: to identify faults efficiently based on a knowledge of fundamental principles and test equipment usage. Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes, is known as: A. The intent of Section 230.