Oil Circuit Breaker Question & AnswersApril 25, 2023 By Wat Electrical This article lists 75 Oil Circuit Breaker MCQs for engineering students. All the Oil Circuit Breaker Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Oil Circuit Breaker.A circuit breaker is a break down or a electric protection device type of device. A circuit breaker is classified based on mediums which acts as insulator. The components of oil based circuit breaker includes arc, oil and vaporized. The oil type circuit breaker function includes quench circuit and break the circuit from break down. The types of oil based circuit breaker includes bulk oil based CB and Minimum oil based CB.Where bulk oil based CB is further classified as arc control and plain break Oil CB. The advantages of oil CB includes reliable, low cost and no controllers are interfaced.The disadvantages of oil based CB includes fire hazard, explosive substance content and oils dielectric strength minimises. Oil based circuit breakers are used in high type of voltage applications 1). A circuit breaker is a ___ type of device? Break down device Electric protection device Diode Both a and b None Hint2). Oil in oil type CB is ______ substance? Insulating Conducting Semi-conducting Both b and c None Hint3). Which of the following function does oil type circuit breaker does? Quench arc Break the circuit All current flow Both a and b None Hint4). Which of the following are the components of oil based circuit breaker? Oil Arc Vaporized oil All the above None Hint5). Which of the following are composition of oil in a oil based CB? Hydrogen Methane Acetylene All the above None Hint6). ___ is generated when hydrogen gas is broken in atomic based form in a oil based CB? Heat Temperature Vapour Both a and b None Hint7). _____ assist the oil based CB in arc quenching? Cooling effect Gas bubbles Heat Both a and b None Hint8). Which of the following are the types of oil based circuit breaker? Bulk oil CB Minimum oil CB Arc control based CB All the above None Hint9). Which of the following are the properties of bulk oil based CB? Uses insulating oil in bulk quantity Use arc quenching Used for insulating materials in large quantity from earth All the above None Hint10). Which of the following are the properties of minimum based oil circuit breaker? Less oil as insulation Arc quenching Extinguishes arc Both a and b None Hint11). Which of the following is the function of bulk oil based circuit breaker? Extinguishes arc Insulates live conductors Semiconducts Both a and b None Hint12). Which type of CB has no control over arc? Plain Break Oil CB Arc Control Oil CB Bulk Oil CB Mini Oil CB None Hint13). Which of the following are the properties of plain break oil CB? Zero arc control Separates the contacts Simple in design All the above None Hint14). Which of the following type of CB is oldest one? Plain Break Oil CB Arc Control Oil CB Bulk Oil CB Mini Oil CB None Hint15). Which of the following are the properties of plain break oil CB? Simple in operation Isolation of current carrying Arc is quenched near zero current crossing All the above None Hint16). Which of the following are the types of self blast based Oil CB? Plain Explosion pot Cross jet explosion pot Self compensated explosion pot All the above None Hint17). Which of the following is the name of chamber in a self blast oil CB? Pressure chamber Explosion pot Both a and b None Hint18). The pressure inside a self blast oil CB is? Small High Zero Medium None Hint19). Which of the following is the shape of self blast CB? Rectangle Cylindrical Circle Triangle None Hint20). The contacts in Plain explosion based pot CB is? Fixed Moving Static All the above None Hint21). Oil in CB acts as _____ substance? Insulating Conducting Non-conducting Both a and c None Hint22). Which of the following is the substance present at the top of CB? Air Oil Liquid Gas None Hint23). The type of oil used in oil circuit breaker is _____? Transformer Greece Helium Kerosene None Hint24). The CB tank carries _____ caused due to interruption of large current? Vibrations Flux Oil Air None Hint25). While normal operation of oil CB the contacts are? Closed Open Shorted Both a and c None HintOil Circuit Breaker MCQ for Exams 26). When arc is struck between windings then ____ happens to CB? Heat is liberated Higher temperature Vaporisation All the above None Hint27). The Oil CB arc is ____ when fixed and moving contacts distance increases? Extinguished Blocked Put off All the above None Hint28). Which of the following are the advantages of oil CB? Reliable Low cost No controllers are interfaced All the above None Hint29). Which of the following are the purpose of oil in oil CB? Small clearance between conductors & earth components High dielectric property Insulating All the above None Hint30). Which of the following are the disadvantages of oil based CB? Fire hazard Explosive substance content Oil’s dielectric strength minimises All the above None Hint31). A oil based circuit breaker is a ___ type of circuit breaker? Traditional Modern Hirachle Both a and b None Hint32). Air in oil based circuit breaker acts as ____ for maintaining oil transformation. Pad Insulator Wall All the above None Hint33). Oil based circuit breakers are used in _____ type of voltage applications? High Low Zero Medium None Hint34). Which of the following are the features of plain break oil CB? Entails simple process Separates contacts Dielectric strength Both a and b None Hint35). Which of the following is the voltage range of oil based circuit breaker? 33kV to 220kV 22kV to 330 kV 300kv to 400kV 500kV None Hint36). Which of the following are the maintenance of oil based circuit breaker? Internal components contacts Arching contacts Dielectric strength All the above None Hint37). Which of the following is the reason for minimum oil in minimum based CB? Has interrupting unit Live potential Single access to oil All the above None Hint38). Which environment does oil circuit breaker is used? Power systems Hydraulic systems Industries Automobiles None Hint39). On which of the following criteria a circuit breaker is classified? Mediums Substances used Components All the above None Hint40). Due to fault arised in oil based circuit breaker, then contacts _____? Separation of contacts Arc struck among the contacts Protection of device Both a and b None Hint41). Which of the following is the best property of oil based circuit breaker? Insulating property Conducting property Ohmic property All the above None Hint42). Which of the following are the main features of oil based circuit breaker? Minimum cost Reliability Simplicity All the above None Hint43). Which of the following is the other name of bulk based oil CB? Dead time Active time Block time All the above None Hint44). For ____ voltage value does a oil based CB uses 8kg of oil? 110kV 200kV 300kV 400kV None Hint45). For ____ voltage value does a oil based CB uses 50,000 kg of oil? 110kV 220kV 300kV 400kV None Hint46). Oil in oil based circuit breaker acts like? Extinguishing medium Insulation Conductance Both a and b None Hint47). Which of the following type of insulation substance does a minimum oil based circuit breaker is placed? Porcelain Silver Platinum Gold None Hint48). In which zones does a minimum oil based circuit breaker is not used? Repetative operation Non-repetative operation Collative operation Both b and c None Hint49). Which of the following are the benefits of min oil based CB? Small size Low maintenance Min weight All the above None Hint50). A bimetallic strip in a electronic based circuit breaker safeguards from ? Load current Electromagnet Paramagnet Both a and b None HintOil Circuit Breaker MCQ for Interviews51). _____ is generated via magneto motive force? Magneto motive force Electromotive force Electric force Both a and b None Hint52). Increase in arc of a oil based CB _____ other properties of circuit? Increases heat released Increases temperature Decreases heat released Both a and b None Hint53).At which condition of oil based CB does space between contacts arrives at critical value? Arc turn off Arc turn on Arc mid section Both b and c None Hint54). Which of the following feature is missed in a oil based circuit breaker? Control function Breakdown function Speed functioning Both b and c None Hint55). ___ is the maintenance part of oil based circuit breaker? Verify oil Change oil Carbonizing All the above None Hint56). Which of the following are the checklist of circuit breaker? Quality of components Arching contacts Oil level All the above None Hint57). ___ quantity of oil is used in oil based circuit breaker? Less High Medium Both a and b None Hint58). A circuit breaker is a ____ type of circuit? Electric Electronic Mechanical Chemical None Hint59). Which of the following are examples or electrical components? Batteries Switches Transistors All the above None Hint60). CB with high currents and voltages has ______ relay pilot? Protective Non-protective Defensive Both a and b None Hint61).When faults in circuit breaker is fount the contacts are? Closed Open Discontinued Both b and c None Hint62). ___ type of CB has manual control lever? Small Large Medium Zero None Hint63). Which of the are the interfaced components of large circuit breaker? Transformer Relays Power source All the above None Hint64). Which of the following are arc extinguishing techniques of a CB? Lengthening/deflecting of arc Jet chambers Partial arc division All the above None Hint65). Which of the following are the classification of a circuit breaker? Voltage Construction Interrupting All the above None Hint66). Which of the following are the types of low voltage based CB? Minature Moddled case Low voltage All the above None Hint67). Which of the following is the current value of miniature based circuit breaker? up to 125A up to 1600A up to 2000 A up to 2500 A None Hint68). Which of the following is the units of current? Amperes Volts Ohms Farads None Hint69). Which of the following are the operation of miniature based circuit breaker? Thermal Thermal magnetic Non-thermal Both a and b None Hint70). Which of the following is the current value of molded based case CB? 125A 1600A 1800A 2000A None Hint71). In which of the following does low voltage based power circuit breakers are implemented? Switchboards Switchgear cabinets Transformer circuit Both a and b None Hint72). Which of the following are the components of switch gear? Switches Fuse Circuit breakers All the above None Hint73). Which of the following are the components of switch gear assembly? Power conducting Control system Non control system Both a and b None Hint74). Which of the following is the unit of power? Watts Volts Amperes Ohms None Hint75). Which of the following are the control systems of a switch gear? Current transformer Potential transformer Protective relays All the above None HintFor More MCQs Circuit Breaker Question & Answers.SF6 Circuit Breaker Question & Answers. Time's up
