Switch Gear and Protection Question & AnswersFebruary 9, 2023 By Wat Electrical This article lists 100 Switch Gear and Protection MCQs for engineering students. All the Switch Gear and Protection 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 Switch Gear and Protection.The switch gear is used for switching, isolation, protection, and control in a power system. The type test, maintenance schedule, acceptance, and commissioning test are the type of tests to be performed on protective gears. In a power system, the surge voltage is caused due to external and internal over-voltage conditions. The measuring relay, fault clearing time, auxiliary relay, relay time, and relay burden are some basic terminologies used in the protection system.The essential features of switchgear are; Complete reliability, absolutely certain discrimination, quick operation, provision for manual control, and instruments . The current transformer, potential transformer, and oil switches come under high voltage switchgear, and air break type switches, isolators come under low voltage switchgear.The switchgear is mainly used in transformer stations, industrial plant factories, distribution substations, paper mills, and so on. The safety of electrical equipment and the safety of human personnel are the operating conditions protection under abnormal. 1). Which one of the following comes under low voltage switchgears? Relays Oil switches Lightning arresters Fuses None HintRead more about Overload relays2). What is the standard form of CLR? Current Limiting Reluctance Current Limiting Reactor Current Limiting Resistor Current Limiting Resonance None Hint3). Which one of the following comes under potential transformer? Ratio error Phase angle error Shell type Gross error None Hint4). What is the standard form of ACB? Air Circuit Breaker Air Control Breaker Air Common Breaker Armature Circuit Breaker None Hint5). What are the advantages of oil circuit breaker? Slower operation Highly inflammable Easily available Uses less quantity of oil None Hint6). The low voltage range of switch gear is up to _______________? 11 KV 66 KV 400 KV 765 KV None Hint7). Which one of the following performs both detection and interruption functions? Circuit breaker Fuse Air circuit breaker Oil switches None Hint8). Which one of the following requires replacement after every operation? Fuse Circuit breaker Oil switches Lightning arresters None Hint9). ________________ are the applications of low voltage switch gear? Motor unit protection Capacitors Both a and b None of the above None HintRead more about Capacitors 10). What is the standard form of BOCB? Bulk Oil Circuit Breaker Beaker Oil Circuit Bulk Bulk Oil Common Breaker Bulk Oil Controller Breaker None HintRead more about Switch Gear components.11). Which one of the following arresters can be done outside of the panel board? Surge arrester Lightning arrester Regulators Fuses None Hint12). What is the standard form of TVSS? Transient Voltage Surge Suppressor Transient Voltage Single Suppressor Transient Voltage Simple Suppressor Transformer Voltage Simple Suppressor None Hint13). What are the essential features of switch gear? Complete reliability Provision for instruments Provision for manual control All of the above None HintRead more about Switchgear 14). Which one of the following comes under switching devices? Isolators Current transformers Regulators Commutators None Hint15). What are the disadvantages of oil circuit breaker? High maintenance cost Low cost Easily available All of the above None Hint16). What is the standard form of MCCB? Moulded Case Circuit Breaker Moulded Case Control Breaker Moulded Case Common Breaker Moulded Case Controller Breaker None Hint17). Which one of the following used as an ON/OFF switch? Fuse Circuit breaker Lightning arresters Oil switches None Hint18). What is the standard form of IDMT? Internal Definite Minimum Time Infinite Definite Minimum Time Inverse Definite Minimum Time Identical Definite Minimum Time None Hint19). The high voltage range of switch gear is up to _______________? 11 KV 66 KV 400 KV 765 KV None Hint20). What is the standard form of MOCB? Minimum Oil Circuit Breaker Main Oil Circuit Beaker Multi Oil Circuit Breaker None Hint21). Which one of the following is an example of principal switchgear? Fuses Circuit breakers Protection relays Regulators None HintRead more about Fuse & Types22). What is the standard form of MDB? Main Distance Board Main Difference Board Main Distribution Board Main Displacement Board None HintRead more about Isolator None 23). Which one of the following comes under symmetric fault? L-L-L-G L-G L-L None of the above None Hint24). What are the effects of electrical faults? Over current flow Loss of equipment Electrical fires All of the above None Hint25). Which one of the following comes under high voltage switchgears? Relays Fuses Current transformer Oil switches None HintSwitchgear and Protection MCQ for Quiz26). What is the standard form of MCB? Main Circuit Breaker Moulded Control Breaker Miniature Circuit Breaker Main Circuit Board None Hint27). In which one of the following the breaking capacity is very large? Circuit breaker Fuse Oil switches Relays None Hint28). Which one of the following comes under control and sensing devices? Switches Voltage transformers Regulators Commutators None Hint29). What are the causes of an electrical faults? Over current flow Loss of equipment Smoke of fires None of the above None Hint30). __________________ are the components of digital relay? Multiplexer and S/H circuits Anti-aliasing filters Event storage system All of the above None Hint31). What is the standard form of RCCB? Residual Current Circuit Breaker Residual Current Control Breaker Residual Current Common Breaker Residual Current Commutator Breaker None Hint32). Which one of the following comes under unsymmetric fault? L-L-L-G L-G LL-G None of the above None Hint33). Which one of the following is an on-load device? Isolator Circuit breaker Regulator Transformer None Hint34). Which one of the following has better capabilities? Isolator Circuit breaker Fuses Relays None Hint35). What is the standard form of HRC? High Rupturing Capacity High Rupturing Controller High Rupturing Commutator High Regulator Capacity None Hint36). Which one of the following requires tripping circuit? Isolator Circuit breaker Insulator Regulator None Hint37). In which one of the following, the periodic maintenance is very much required? Isolator Circuit breaker Insulator Regulator None Hint38). What is the standard form of SAW? Submerged Arc Welding Single Arc Welding Simple Arc Welding Structural Arc Welding None Hint39). _____________ are the qualities of protective relay? Selectivity Speed Sensitivity All of the above None Hint40). What is the standard form of VCB? Vacuum Commutator Breaker Vacuum Controller Breaker Vacuum Circuit Breaker Voltage Commutator Breaker None Hint41). In which one of the following no auxiliary contact is required? Fuse Circuit breaker Insulator Regulator None Hint42). Which one of the following comes under decision making devices? Switches Isolators Lightning Relays None Hint43). What is the standard form of SDB? Single Distribution Board Simple Distribution Board Sub Distribution Board Sectional Distribution Board None Hint44). Which one of the following has arcing contact and main contact? Isolator Circuit breaker Relays Regulators None Hint45). What is the standard form of SF6CB? Sulphur Hexafluoride Commutator Breaker Sulphur Hexafluoride Controller Breaker Sulphur Hexafluoride Circuit Breaker Sulphur Hexafluoride Commutator Board None Hint46). Which one of the following operating times is very small? Circuit breaker Fuse Relays Surge arrester None Hint47). Which one of the following is an example of auxiliary switchgear? Fuses Isolators Circuit breakers Regulators None Hint48). Which one of the following occupies more space? Isolator Circuit breaker Surge arrester Lightning arrester None Hint49). What is the standard form of GMAW? Gas Metal Arc Welding Group Main Arc Welding Gas Metal Welding Gas Metal Armature Welding None Hint50). What is the standard form of ABCB? Air Blast Commutator Breaker Air Blast Controller Breaker Air Blast Circuit Breaker Armature Blast Commutator Breaker None HintSwitchgear and Protection MCQ for Interviews51). The _____________ relay is based on actuating parameter? Static relay Mechanical relay Current relay Latching relay None Hint52). The ________________ relay is based on operation of mechanism? Current relay Voltage relay Static relay Latching relay None Hint53). What is the standard form of FACTS? Flexible AC Transmission System Flexible AC Transient System Flexible AC Transformer System Flexible Armature Transmission System None Hint54). What is the standard form of SVC? Static VAR Controller Static VAR Compensator Static VAR Commutator Simplex VAR Compensator None Hint55). Which one of the following is a type of distance relay? Reactance relay Balanced beam relay Induction disc relay Latching relay None Hint56). What is the standard form of LBS? Line Breaking Switch Load Breaking Switch Load Breaking Signal Load Board Switch None Hint57). In which one of the following operating times is from 0.1 to 0.2 sec? Circuit breaker Fuse Relay Regulator None Hint58). What is the standard form of ATS? Automatic Transformer Switch Automatic Transfer Switch Automatic Transient Switch Armature Transfer Switch None Hint59). What is the standard form of STATCOM? Static Synchronous Compensator Synchronous Static Compensator Static Synchronous Commutator Static Synchronous Controller None Hint60). Which one of the following is a type of electromagnetic relay? Reactance relay Balanced beam relay Quadrilateral relay Machine tool relay None Hint61). Which one of the following doesn’t give any indication? Fuse Circuit breaker Machine tool relay Contactor None Hint62). What is the standard form of ELCB? Earth Leakage Control Breaker Earth Leakage Commutator Breaker Earth Leakage Circuit Breaker Earth Line Control Breaker None Hint63). Which one of the following is a best modelled by magnetic breakers? Instantaneous over current relay protection Time over current relay protection Both a and b None of the above None Hint64). What is the standard form of SMAW? Shielded Metal Arc Welding Shielded Main Arc Welding Single Metal Arc Welding None Hint65). Which one of the following circuit breakers used for medium capacities? BOCB ABCB GFCI AFCI None Hint66). Which one of the following is a safety isolation device? Isolator Circuit breaker AFCI Mercury-wetted relay None Hint67). In which one of the following relays the multifunction's are possible? Microprocessor based Electro-mechanical Both a and b None of the above None HintRead more about Distance Relay68). In which one of the following relays, the blocking feature is not available? Electro-mechanical Microprocessor based Mercury-wetted relay Mercury relay None Hint69). What is the standard form of FCAW? Flux Control Arc Welding Flux Common Arc Welding Flux Cord Arc Welding Flexible Control Arc Welding None Hint70). In which one of the following circuit breakers, the reliability is less? BOCB ABCB GFCI AFCI None Hint71). The extra high voltage range of switch gear is up to _______________? 11 KV 66 KV 400 KV 765 KV None Hint72). What is the standard form of MPCB? Motor Protection Circuit Breaker Motor Protection Control Breaker Motor Protection Commutator Breaker Main Protection Circuit Breaker None Hint73). Which one of the following is a normal circuit protector? Isolator Circuit breaker Relays Fuses None Hint74). What is the standard form of ECM? Electro Chemical Meter Electro Chemical Method Electro Chemical Machining Electro Controller Meter None Hint75). In which one of the following circuit breakers the endurance is below average? Vacuum breakers Oil breakers Air breakers Residual Current Circuit Breaker None HintSwitchgear and Protection MCQ for Exams76). What is the standard form of EBM? Electrical Beam Meter Electron Beam Motor Electron Beam Machining Electrical Board Meter None Hint77). The heat input is high per unit length in ____________ type of welding? Arc Laser Hybrid FCAW None Hint78). The welding speed is low in _______________ type of welding? Arc Laser Hybrid FCAW None Hint79). What is the standard form of GTAW? Gas Tungsten Arc Welding Gas Tungsten Aim Welding Gas Tungsten AM Welding Gas Tungsten Armature Welding None Hint80). Which one of the following circuit breakers sizes is quite large? Vacuum breakers Oil breakers Air breakers GTAW/TIG None Hint81). What is the standard form of HBC? High Breaking Control Fuse High Breaking Commutator Fuse High Breaking Current Fuse High Breaking Common Fuse None Hint82). Which one of the following has moving blades/alarm and main contact? Isolator Circuit breaker Mercury relay Multi-voltage relays None Hint83). The arc quenching techniques provided in ________________? Isolator Circuit breaker Machine tool relay Coaxial relay None Hint84). Which one of the following operated automatically or manually? Isolator Circuit breaker Coaxial relay Contactor None Hint85). What is the standard form of HVCB? High Voltage Commutator Breaker High Voltage Controller Breaker High Voltage Circuit Breaker High Voltage Common Breaker None Hint86). Which one of the following is a best modelled by thermal breakers? Instantaneous over current relay protection Time over current relay protection Both a and b None of the above None Hint87). The flags, targets are the visual indications in ______________ relays? Electro-mechanical Microprocessor based Both a and b None of the above None Hint88). In which one of the following relays the self-supervision feature is available? Electro-mechanical Numerical relays Latching relay Machine tool relay None Hint89). The speed of operation is low in ________________ relay? Electro-mechanical Numerical relays Machine tool relay Mercury relay None Hint90). What is the standard form of LVSD? Less Voltage Switch Devices Line Voltage Switch Devices Low Voltage Switchgear Devices Low Volume Switchgear Devices None Hint91). The range of settings is wide in _________________ relay? Electro-mechanical Microprocessor based Latching relay Machine tool relay None Hint92). In which one of the following relays the communication feature is not available? Electro-mechanical Microprocessor based Latching relay Machine tool relay None Hint93). The consistency of calibration is deteriorate with time in ________________ relay? Electro-mechanical Numerical relays Latching relay Machine tool relay None Hint94). Which one of the following relays is not adaptable? Numerical relays Electro-mechanical Contactor Coaxial relay None Hint95). What is the standard form of HVS? High Voltage Switches High Voltage Signals High Voltage Sample High Volt-ampere Switches None Hint96). The medium voltage range of switch gear is up to _______________? 11 KV 66 KV 400 KV 765 KV None Hint97). The LEDs, LCD are the visual indications in ______________ relays? Electro-mechanical Microprocessor based Both a and b None of the above None Hint98). What is the standard form of EDM? Electrical Discharge Meter Electro Discharge Method Electro Discharge Machining Electro Discharge Multimeter None Hint99). Which one of the following found in an electrical distribution and generation stations such as yards? Isolator Circuit breaker Fuses Regulator None Hint100). What is the standard form of HVF? High Voltage Fission High Voltage Fusion High Voltage Fuses High Volt-ampere Fuses None HintFor more MCQs refer toIsolator MCQ's Time's up
