Oil Circuit Breaker Question & Answers April 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 Hint 2). Oil in oil type CB is ______ substance? Insulating Conducting Semi-conducting Both b and c Hint 3). Which of the following function does oil type circuit breaker does? Quench arc Break the circuit All current flow Both a and b Hint 4). Which of the following are the components of oil based circuit breaker? Oil Arc Vaporized oil All the above Hint 5). Which of the following are composition of oil in a oil based CB? Hydrogen Methane Acetylene All the above Hint 6). ___ is generated when hydrogen gas is broken in atomic based form in a oil based CB? Heat Temperature Vapour Both a and b Hint 7). _____ assist the oil based CB in arc quenching? Cooling effect Gas bubbles Heat Both a and b Hint 8). 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 Hint 9). 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 Hint 10). 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 Hint 11). Which of the following is the function of bulk oil based circuit breaker? Extinguishes arc Insulates live conductors Semiconducts Both a and b Hint 12). Which type of CB has no control over arc? Plain Break Oil CB Arc Control Oil CB Bulk Oil CB Mini Oil CB Hint 13). Which of the following are the properties of plain break oil CB? Zero arc control Separates the contacts Simple in design All the above Hint 14). Which of the following type of CB is oldest one? Plain Break Oil CB Arc Control Oil CB Bulk Oil CB Mini Oil CB Hint 15). 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 Hint 16). 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 Hint 17). Which of the following is the name of chamber in a self blast oil CB? Pressure chamber Explosion pot Both a and b Hint 18). The pressure inside a self blast oil CB is? Small High Zero Medium Hint 19). Which of the following is the shape of self blast CB? Rectangle Cylindrical Circle Triangle Hint 20). The contacts in Plain explosion based pot CB is? Fixed Moving Static All the above Hint 21). Oil in CB acts as _____ substance? Insulating Conducting Non-conducting Both a and c Hint 22). Which of the following is the substance present at the top of CB? Air Oil Liquid Gas Hint 23). The type of oil used in oil circuit breaker is _____? Transformer Greece Helium Kerosene Hint 24). The CB tank carries _____ caused due to interruption of large current? Vibrations Flux Oil Air Hint 25). While normal operation of oil CB the contacts are? Closed Open Shorted Both a and c Hint Oil 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 Hint 27). The Oil CB arc is ____ when fixed and moving contacts distance increases? Extinguished Blocked Put off All the above Hint 28). Which of the following are the advantages of oil CB? Reliable Low cost No controllers are interfaced All the above Hint 29). 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 Hint 30). Which of the following are the disadvantages of oil based CB? Fire hazard Explosive substance content Oil’s dielectric strength minimises All the above Hint 31). A oil based circuit breaker is a ___ type of circuit breaker? Traditional Modern Hirachle Both a and b Hint 32). Air in oil based circuit breaker acts as ____ for maintaining oil transformation. Pad Insulator Wall All the above Hint 33). Oil based circuit breakers are used in _____ type of voltage applications? High Low Zero Medium Hint 34). Which of the following are the features of plain break oil CB? Entails simple process Separates contacts Dielectric strength Both a and b Hint 35). Which of the following is the voltage range of oil based circuit breaker? 33kV to 220kV 22kV to 330 kV 300kv to 400kV 500kV Hint 36). Which of the following are the maintenance of oil based circuit breaker? Internal components contacts Arching contacts Dielectric strength All the above Hint 37). 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 Hint 38). Which environment does oil circuit breaker is used? Power systems Hydraulic systems Industries Automobiles Hint 39). On which of the following criteria a circuit breaker is classified? Mediums Substances used Components All the above Hint 40). 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 Hint 41). Which of the following is the best property of oil based circuit breaker? Insulating property Conducting property Ohmic property All the above Hint 42). Which of the following are the main features of oil based circuit breaker? Minimum cost Reliability Simplicity All the above Hint 43). Which of the following is the other name of bulk based oil CB? Dead time Active time Block time All the above Hint 44). For ____ voltage value does a oil based CB uses 8kg of oil? 110kV 200kV 300kV 400kV Hint 45). For ____ voltage value does a oil based CB uses 50,000 kg of oil? 110kV 220kV 300kV 400kV Hint 46). Oil in oil based circuit breaker acts like? Extinguishing medium Insulation Conductance Both a and b Hint 47). Which of the following type of insulation substance does a minimum oil based circuit breaker is placed? Porcelain Silver Platinum Gold Hint 48). In which zones does a minimum oil based circuit breaker is not used? Repetative operation Non-repetative operation Collative operation Both b and c Hint 49). Which of the following are the benefits of min oil based CB? Small size Low maintenance Min weight All the above Hint 50). A bimetallic strip in a electronic based circuit breaker safeguards from ? Load current Electromagnet Paramagnet Both a and b Hint Oil Circuit Breaker MCQ for Interviews 51). _____ is generated via magneto motive force? Magneto motive force Electromotive force Electric force Both a and b Hint 52). Increase in arc of a oil based CB _____ other properties of circuit? Increases heat released Increases temperature Decreases heat released Both a and b Hint 53).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 Hint 54). Which of the following feature is missed in a oil based circuit breaker? Control function Breakdown function Speed functioning Both b and c Hint 55). ___ is the maintenance part of oil based circuit breaker? Verify oil Change oil Carbonizing All the above Hint 56). Which of the following are the checklist of circuit breaker? Quality of components Arching contacts Oil level All the above Hint 57). ___ quantity of oil is used in oil based circuit breaker? Less High Medium Both a and b Hint 58). A circuit breaker is a ____ type of circuit? Electric Electronic Mechanical Chemical Hint 59). Which of the following are examples or electrical components? Batteries Switches Transistors All the above Hint 60). CB with high currents and voltages has ______ relay pilot? Protective Non-protective Defensive Both a and b Hint 61).When faults in circuit breaker is fount the contacts are? Closed Open Discontinued Both b and c Hint 62). ___ type of CB has manual control lever? Small Large Medium Zero Hint 63). Which of the are the interfaced components of large circuit breaker? Transformer Relays Power source All the above Hint 64). Which of the following are arc extinguishing techniques of a CB? Lengthening/deflecting of arc Jet chambers Partial arc division All the above Hint 65). Which of the following are the classification of a circuit breaker? Voltage Construction Interrupting All the above Hint 66). Which of the following are the types of low voltage based CB? Minature Moddled case Low voltage All the above Hint 67). 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 Hint 68). Which of the following is the units of current? Amperes Volts Ohms Farads Hint 69). Which of the following are the operation of miniature based circuit breaker? Thermal Thermal magnetic Non-thermal Both a and b Hint 70). Which of the following is the current value of molded based case CB? 125A 1600A 1800A 2000A Hint 71). In which of the following does low voltage based power circuit breakers are implemented? Switchboards Switchgear cabinets Transformer circuit Both a and b Hint 72). Which of the following are the components of switch gear? Switches Fuse Circuit breakers All the above Hint 73). Which of the following are the components of switch gear assembly? Power conducting Control system Non control system Both a and b Hint 74). Which of the following is the unit of power? Watts Volts Amperes Ohms Hint 75). Which of the following are the control systems of a switch gear? Current transformer Potential transformer Protective relays All the above Hint For More MCQs Circuit Breaker Question & Answers.SF6 Circuit Breaker Question & Answers. Time's up
