Description : What items are you to check when working on a circuit breaker?
Last Answer : Check the operating mechanism for smooth operation, check the contacts for pitting, check the terminals for tightness and corrosion, check the mounting hardware for tightness and wear, check all components for wear, and check the entire circuit breaker for cleanliness.
Description : What type of circuit breaker is used on a multimeter?
Last Answer : A push button or push-pull circuit breaker (small size, low power).
Description : What factors are used to select a circuit breaker?
Last Answer : The power requirements of the circuit and the physical space available.
Description : Where should you use a nontrip-free circuit breaker?
Last Answer : In emergency or essential circuits.
Description : Where should you use a trip-free circuit breaker?
Last Answer : In current sensitive or nonemergency systems.
Description : What is a nontrip-free circuit breaker?
Last Answer : A circuit breaker that can be overridden if the operating mechanism is held ON.
Description : What is a trip-free circuit breaker?
Last Answer : A circuit breaker that will trip even if the operating mechanism is held ON.
Description : What are the three types of circuit breaker trip elements?
Last Answer : Thermal, magnetic, and thermal-magnetic
Description : What are the five main components of a circuit breaker?
Last Answer : Frame, operating mechanism, arc extinguishers, terminal connectors, and trip element.
Description : An alternator switchboard has a synchroscope and synchronizing lamps. If the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus? ... D. A portable phase sequence indicator must be used to verify the information from the lamps.
Last Answer : Answer: C
Description : Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air? A. Open the machine on both ends so as to allow the air and dust to escape. B. Be certain that the ... panel. C. Be certain that the air is clean and as dry as possible. D. All of the above.
Last Answer : Answer: D
Description : Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out? A. De-energize the applicable switchboard bus. B. Bypass the interlocks. C. ... supply circuit breaker in the open position. D. Station a man at the circuit supply switch.
Description : The recruiting and selection process should include enough steps to yield the information needed to make accurate selection decisions. However, the stages of the process should be sequenced so that the more ... anything else. C)near the end. D)paid by the prospects rather than the company.
Last Answer : C)near the end.
Description : Before working on an electric cargo winch master switch or controller, you should _____________. A. spray the gasket surface with a solvent B. drain condensate from the box C. open the circuit breaker in the power supply and tag D. heat the switch box to remove any moisture
Description : Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component? A. Wear rubber gloves and boots. B. Use only approved nonconducting ... the machine before beginning any repairs. D. Open the supply circuits and tag the switches.
Description : What steps are to be taken before disconnecting one Alternator from parallel operation?
Last Answer : The following steps are to be taken before disconnecting one Alternator from parallel operation · The prime-mover input of the outgoing generator has to be decreased and that of other generators ... delivered by the outgoing generator is zero, it has to be disconnected from parallel operation.
Description : What are the steps to be taken before starting roof-top garden?
Last Answer : Precautions must be taken to prevent the leakage of water from roof due to seepage of water. Measures must be taken to enable the roof to bear the additional weight of plants. And soil.
Description : What are the steps taken before releasing sewage water into water bodies?
Last Answer : a) Sewage water must be treated to remove suspended particles. b) It must be aerated c) Chlorinated to purify water.
Description : What are the steps taken before releasing the industrial effluents into water bodies?
Last Answer : a) Industrial effluents must be treated to remove the pollutants. b) Toxic chemical substances must be eliminated. c) Acid and alkalies must be neutralized. d) Metallic compounds must be precipitated
Description : When adding a room onto your home, what are the steps you follow, from beginning to end, as your own general contractor?
Last Answer : I would at least have an architect review your plans before you submit them for permits. You probably need electrical drawings, framing drawings, foundation drawings, plumbing(if there is any) and ... would have considered working with a homeowner before are getting hungry enough to do it now.
Description : What defines all of the steps or business rules, from beginning to end, required for a process to run correctly? a. Workflow b. EIP c. Workflow system d. SLA
Last Answer : a. Workflow
Description : What safety precaution must be taken before replacing a transistor?
Last Answer : The power must be removed from the circuit.
Description : What must be done to a circuit before you can use an ohmmeter for testing?
Last Answer : It must be de-energized.
Description : Before you connect a VOM in a circuit for an ohmmeter reading, in what condition must the circuit be?
Last Answer : De-energized
Description : Electrical jellies! Got a circuit breaker (home) that has popped and won't reset. Suggestions?
Last Answer : My husband, who was a master electrician, said you need to call a professional. You either have a bad breaker or the breaker that refuses to reset is saving your life because you have a dead short some place and your house would burn down if ithe breaker wasn’t tripped.
Description : My (soon-to-be-replaced) air conditioner is frequently tripping the circuit breaker in my apartment. What can I do to prevent this?
Last Answer : answer:A mini-split AC unit will use less power than a regular square version and should help with the problem. However if your problem resides in old wiring with a lower amperage/threshold you might ... every time you want to use it but this has cut my electric bill dramatically. Hope this helps
Description : What is the difference between a fuse and a circuit breaker ?
Last Answer : Fuse : It is a type of soft metal wire which, when more than the required current flows through the wire, burns it, disconnects the electrical circuit from the source and protects the valuable ... or fault in the power supply line . This breaks the static contact and protects it from accidents.
Description : Why is the circuit breaker turned off automatically ?
Last Answer : Circuit breakers are automatically turned off to protect electrical equipment from damage. An automatic switch is used to protect the electrical circuit or electrical equipment from damage due to ... is stopped and the electrical equipment connected to the circuit is protected from damage.
Description : What is Earth Leakage Circuit Breaker ?
Last Answer : Earth leakage circuit breaker is a protective device which protects the leaky faulty or faulty circuit from dangerous parts by separating it from the good parts. The leakage current of the circuit flows ... a faulty place due to a leakage error in the circuit is called a leakage circuit breaker.
Description : What is an Air Circuit Breaker ?
Last Answer : Air circuit breaker is a circuit breaker which is controlled by air, that is, a breaker which is turned on by air pressure and turned off by air pressure .
Description : What is Oil Circuit Breaker ?
Last Answer : An oil circuit breaker is a circuit breaker that contains oil and is in operation or on-off insulation oil . The oil used in the oil circuit breaker acts as insulation and extinguishes the arc. ... types. A) Plain brake type bulk oil circuit breaker and b) Arc controlled bulk oil circuit breaker.
Description : What is a circuit breaker ?
Last Answer : When excessive current flows in any faulty circuit , it is called circuit breaker which disconnects automatically or automatically.
Description : What is the reason for using circuit breaker in circuit ?
Last Answer : Circuit breakers are used for safety.
Description : What is the function of circuit breaker ?
Last Answer : Used to stop excessive flow
Description : What are the common sizes of circuit breaker panel for all electrical home?
Last Answer : 200 amp is the most common size used in most homes.
Description : Why will too many electrical devices operating at one time after blow a fuse or trip a circuit breaker?
Last Answer : The load exceeds the limit of the breaker or fuse. For example a20 amp breaker on a 120 volt circuit will handle 2400 watts. Exceedthat wattage and the breaker will trip or the fuse will blow.
Description : My current microwave oven causes my circuit breaker to trip if I use it at the same time as my toaster oven. Will this microwave solve that problem?
Last Answer : It's doubtful; I wouldn't be able to answer that for sure unless I knew the particulars of your set-up (what is your microwave/toaster's draw? what kind of breaker do you have? etc.), but I don't see any reason why this microwave would help that situation.
Description : In accordance with Coast Guard Regulations (46 CFR), a circuit breaker located in the machinery space and installed in a 440V AC system must _____________. A. be dependent upon mechanical ... the maximum asymmetrical shortcircuit current available at the point of application D. all of the above
Description : Coast Guard Regulations (46 CFR) require each switchboard to have ___________. A. non-conductive deck covering at the frount B. non-conductive deck coverings at the rear C. a name plate for each circuit breaker D. all the above
Description : Which of the synchroscope illustrations depicts the appropriate direction of rotation and position for closing the circuit breaker when paralleling AC generators? EL-0053 A. A B. B C. C D. D
Description : The schematic diagram shown in the illustration uses symbol 'A' to represent a/an _________. EL-0011 A. non-renewable fuse link B. circuit breaker coil C. overload relay coil D. thermal overload heater
Description : An AC generator operating in parallel loses its excitation without tripping the circuit breaker. This will __________. A. not affect the faulty generator due to the compensation of the other generators B. ... between the armature and the bus D. cause high currents to be induced in the field windings
Description : Voltage failure of an AC generator may be caused by ____________. A. failure of the exciter generator B. a tripped bus circuit breaker C. high mica segments on the stator bus bar D. excessive prime mover speed
Last Answer : Answer: A
Description : Which of the following problems will occur if the circuit breaker of the incoming alternator is closed and it is 180° out of phase with the loaded alternator when paralleling? A. The rotor of the ... The rotor of the incoming alternator will stop. D. Both alternators will parallel 180° out of phase.
Last Answer : Answer: B
Description : Which of the following actions must be carried out prior to closing the alternator circuit breaker according to the graph shown in the illustration? EL-0002 A. Increase the alternator voltage. B. Decrease the line voltage. C. Increase the line voltage. D. Decrease the line frequency.
Description : An alternator will fail to produce line voltage as a result of _____________. A. a closed circuit breaker B. oxidized slip rings C. improperly staggered brushes D. exciter generator failure
Description : In order to safely carry out repairs to a generator circuit breaker, it must be isolated from the bus. This is accomplished by opening the _____________. A. reverse power relay B. bus disconnect link C. generator bus fuse connections D. power directional relay
Description : A circuit breaker for a 300 KW alternator is rated at 470 amperes of full continuous load. The amount of overcurrent allowed is 125%. Which of the following conditions will trip the breaker? A. ... 10 minutes. C. Momentary starting load of 550 amperes. D. Sustained current flow of 590 amperes.
Description : As a result of a mechanical malfunction in one of the ship's service generators operating in parallel, you must secure that generator. In order to prevent a possible overload to the ... feeder circuit breakers, the malfunctioning prime mover turbine throttle trip, and the generator circuit breaker.
Description : As shown in the illustration, 'B' is a ____________. EL-0058 A. single-pole, double-throw switch B. double-pole, single-throw switch C. double-pole, double-throw switch D. circuit breaker