Synchronous Generator Question & AnswersFebruary 4, 2023 By Wat Electrical This article lists 100 Synchronous Generator MCQs for engineering students. All the Synchronous Generator 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 Synchronous Generator.The alternator or synchronous generator's basic parts are the rotor which is DC excited winding and the stator three-phase winding. The salient pole and cylindrical or round rotor are two types of synchronous machines. In an alternator or synchronous generator various losses occur such as armature copper loss, field copper loss, brush contact loss, hysteresis and eddy current loss, friction, and windage loss. Alternators have brushes and slip rings and they also use a rotating coil.The failure of the prime mover, failure of the exciter, overloading, unbalanced loading, over-voltage, and over-speed are the abnormalities of an alternator or synchronous generator. The different methods to start synchronous motors are by using the pony motors, damper winding, a slip ring induction motor, and using a small DC machine coupled to it.The synchronizing can be done by using synchroscope and dark lamp methods. The reasons for the parallel operation of synchronous generators are handling larger loads, increased efficiency, increased system reliability, and maintenance that can be done without power dissipation. 1). Which one of the following methods is used to find voltage regulation? Direct loading method Ampere turns method EMF method All of the above None Hint2). In which one of the following rotors is preferred for low-speed alternators? Smooth cylindrical Salient pole Both a and b None of the above None Hint3). Which one of the following prime movers is used in the salient pole rotors? Electric motors Steam turbines Water turbines None of the above None Hint4). Which one of the following rotors is mechanically robust? Smooth cylindrical rotors Salient pole rotors Both a and b None of the above None Hint5). The small diameter and large axial length are the features of ___________________ rotor? Salient pole rotors Smooth cylindrical rotors Both a and b None of the above None Hint6). Which one of the following comes under copper losses? Eddy current Friction loss Brush contact loss None of the above None Hint7). What type of ring do alternators or synchronous generators have? Split ring commutator Slip rings, and brushes Both a and b None of the above None Hint8). Which one of the following is a type of single-layer winding? Chain winding Series compound Shunt compound None of the above None Hint9). When coil span is equal to pole pitch then that winding is known as _________________? Short pitched winding Full pitched winding Both a and b None of the above None Hint10). Which one of the following takes input from the stator? Alternator Capacitor Transformer None of the above None Hint11). ____________________ are the abnormalities of an alternator or synchronous generator? Overvoltage Over speed Overloading All of the above None Hint12). Which one of the following comes under stator fault? Earth fault Phase to phase Both a and b None of the above None Hint13). Which one of the following methods is used to start the synchronous motor? Pony motors Damper winding Both a and b None of the above None Hint14). In which one of the following the excitation is required? Synchronous generator Induction generator Both a and b None of the above None Hint15). Which one of the following has more efficiency? DC Generator Alternator Transformer None of the above None Hint16). Which one of the following is driven by a water turbine? Hydro generator Turbo alternators Both a and b None of the above None Hint17). What are the advantages of an armature as a stator? Easy cooling Easy insulation More efficient All of the above None Hint18). Which one of the following is an air-cooled turbo generator? TARI THRI THDF None of the above None Hint19). The undefined loss is the cause of _____________ loss? Copper loss Core loss Windage loss Stray loss None Hint20). Which one of the following takes input from the rotor? Generator Capacitor Transformer None of the above None Hint21). In which one of the following windings the end turns are shorter? Single layer windings Double layer windings Both a and b None of the above None Hint22). The speed of the diesel engine prime mover is ____________ RPM? 750 to 1500 750 to 4000 750 to 6000 750 to 7000 None Hint23). The cooling media is water in _______________ turbo generator? THDD THWW TARI None of the above None Hint24). What is the standard form of UEL? Under Excitation Limiter Under Exchange Limiter Under Excitation Less None of the above None Hint25). Which one of the following methods is also known as the ampere turn method? MMF method ZPF method Synchronous impedance method All of the above None HintSynchronous Generator MCQ for Quiz26). In which one of the following generators, the speed range is up to 3000 RPM? Hydro generator Turbo alternators Both a and b None of the above None Hint27). In which one of the following generators the stator winding is directly water-cooled? TARI THRI THDF None of the above None Hint28). What are the main components of the turbine? Runner Labyrinths Shaft seal All of the above None Hint29). The specific speed of the Pelton wheel turbine is _____________ RPM? 10-50 rpm 60-300 rpm 300-1000 rpm None of the above None Hint30). Which one of the following supports a wider range of RPM? Alternator Capacitor Transformer None of the above None Hint31). The hysteresis and eddy current is the cause of _____________ loss? Copper loss Core loss Windage loss Stray loss None Hint32). The amount of water striking the runner divided by the amount of water supplied to the turbine is known as _____________ efficiency? Volumetric Overall Hydraulic Mechanical None Hint33). Which one of the following excitation systems is provided for a large-capacity generator? Static exciter Pilot exciter Brushless exciter None of the above None Hint34). The field current capacity is lower in _____________ SCR? High SCR Low SCR Both a and b None of the above None Hint35). What are the disadvantages of diesel engines? More noisy More expensive Both a and b None of the above None Hint36). In low head power plans the head of water is more than ___________________? 10000 meters 1.5 to 80 meters 40000 meters 80 to 500 meters None Hint37). What is the standard form of OEL? Over Excitation Limiter Over Exchange Limiter Overall Excitation Less None of the above None Hint38). The specific speed of the Francis turbine is _____________ RPM? 10-50 rpm 60-300 rpm 300-1000 rpm None of the above None Hint39). The rotor cooling is direct H2 in _____________ turbo generator? THDD THDF Both a and b None of the above None HintRead more about Synchronous Generator 40). Which one of the following supports a lesser range of RPM? Generator Capacitor Transformer None of the above None Hint41). In which one of the following windings, the phase induction is low? Single layer windings Double layer windings Both a and b None of the above None Hint42). Which one of the following is a hydrogen/water-cooled turbo generator? TARI THRI THDF None of the above None Hint43). The power available at the turbine shaft divided by net power supplied at the turbine entrance is known as _____________ efficiency? Volumetric Overall Hydraulic Mechanical None Hint44). In medium head power plans the head of water is more than ___________________? 10000 meters 20000 meters 40000 meters 80 to 500 meters None Hint45). What is the standard form of SCL? Simple Current Limiter Single Current Limiter Stator Current Limiter None of the above None Hint46). The figure shown below is a block diagram of ____________ generator? Turbine Hydraulic Synchronous and AVR None of the above None Hint47). In which one of the following exciters the length of the machine is longer? DC exciter AC exciter with stationary diodes Brushless exciter None of the above None Hint48). In which one of the following exciters does the control respond very fast? DC exciter AC exciter with stationary diodes Brushless exciter Static exciter None Hint49). The specific speed of the Kaplan turbine is _____________ RPM? 10-50 rpm 60-300 rpm 300-1000 rpm None of the above None Hint50). In which one of the following post-installation polarization is not required? Generator Alternator Transformer None of the above None HintSynchronous Generator MCQ for Interviews51). In which one of the following generators the speed range is from 100 to 1000 RPM? Hydro generator Turbo alternators Both a and b None of the above None Hint52). In which one of the following generators the rotor/winding/stator core is directly hydrogen-cooled? TARI THRI Both a and b None of the above None Hint53). The speed of the gas turbine prime mover is ____________ RPM? 750 to 1500 750 to 4000 1500 to 3000 750 to 7000 None Hint54). The maximum capacity of the THDF turbo generator is _______________? 150 Mw 250 Mw 350 Mw 500 Mw None Hint55). The power developed by the runner divided by net power supplied at the turbine entrance is known as _____________ efficiency? Volumetric Overall Hydraulic Mechanical None Hint56). What are the advantages of diesel engines? More efficient More reliable More durable All of the above None Hint57). In high-head power plans the head of water is more than ___________________? 10000 meters 20000 meters 40000 meters 500 meters None Hint58). What are the advantages of hydraulic power plants? Long plant life Pollution free Operating cost is very low All of the above None Hint59). The cooling media is hydrogen in _______________ turbo generator? THDD THWW TARI None of the above None Hint60). Which one of the following can’t be used to charge a dead battery? Generator Alternator Transformer None of the above None Hint61). In which one of the following windings the rotor losses are lower? Double layer windings Single layer windings Both a and b None of the above None Hint62). Which one of the following rotors has large projecting poles? Smooth cylindrical rotors Salient pole rotors Both a and b None of the above None Hint63). Which one of the following comes under mechanical losses? Eddy current Friction loss Brush contact loss None of the above None Hint64). In which one of the following the voltage variation is possible? Induction generator Synchronous generator Both a and b None of the above None Hint65). In which one of the following generators the stator winding is indirectly air-cooled? TARI THRI THDF Both a and b None Hint66). The air friction loss in the cooling fan mounted on the rotor shaft is the cause of _____________ loss? Mechanical loss Core loss Windage loss Stray loss None Hint67). The cooling media is air in _______________ turbo generator? THDD THWW TARI None of the above None Hint68). The power available at the turbine shaft divided by power developed by the runner is known as _____________ efficiency? Volumetric Overall Hydraulic Mechanical None Hint69). Which one of the following excitation systems is provided for the low-capacity generator? Static exciter Pilot exciter Brushless exciter None of the above None Hint70). In which one of the following is the brush durability higher? Generator Alternator Transformer None of the above None Hint71). In which one of the following generators the rating is up to 1000 Mw? Turbo alternators Hydro generator Both a and b None of the above None Hint72). In which one of the following generators the rotor winding/stator core is directly air-cooled? TARI THRI THDF Both a and b None Hint73). In which one of the following exciters the response ratio selection is flexible? DC exciter AC exciter with stationary diodes Brushless exciter Static exciter None Hint74). The static excitation system consists of ________________? Rectifier transformer Field discharge equipment Both a and b None of the above None Hint75). In which one of the following windings, the synchronous winding factor is lower? Double layer windings Single layer windings Both a and b None of the above None HintSynchronous Generator MCQ for Students76). The maximum capacity of the THRI turbo generator is _______________? 150 Mw 250 Mw 350 Mw 500 Mw None Hint77). Which one of the following excitation systems is provided for a high-capacity generator? Static exciter Pilot exciter Brushless exciter None of the above None Hint78). In which one of the following exciter the length of the machine short? Static exciter DC exciter Both a and b None of the above None Hint79). The stator cooling is indirect in _____________ turbo generator? TARI THRI Both a and b None of the above None Hint80). Which one of the following is generally larger in size? Generator Alternator Transformer None of the above None Hint81). In which one of the following the efficiency, cost, and inertia are high? Induction generator Synchronous generator Both a and b None of the above None Hint82). The friction loss in bearings is the cause of _____________ loss? Mechanical loss Core loss Windage loss Stray loss None Hint83). _______________ are the parameters of any generator decided by SCR? Stability limit Size, efficiency, cost Voltage regulation All of the above None Hint84). The maximum capacity of the TARI turbo generator is _______________? 150 Mw 250 Mw 350 Mw 500 Mw None Hint85). In which one of the following windings the back EMF is more sinusoidal? Single layer windings Double layer windings Both a and b None of the above None Hint86). Which one of the following comes under rotor fault? Earth fault Phase to phase Both a and b None of the above None Hint87). The speed of the steam turbine prime mover is ____________ RPM? 750 to 1500 750 to 4000 1500 to 3000 3000 None Hint88). Which one of the following is a hydrogen-cooled turbo generator? TARI THRI THDF None of the above None Hint89). Which one of the following methods is also known as the Potier triangle method? MMF method ZPF method Synchronous impedance method All of the above None Hint90). Which one of the following has a commutator mechanism? DC Generator Alternator Transformer None of the above None Hint91). In which one of the following rotors the air gap is non-uniform? Smooth cylindrical Salient pole Both a and b None of the above None Hint92). Which one of the following is driven by a steam turbine? Hydro generator Turbo alternators Both a and b None of the above None Hint93). In which one of the following generators the rating is up to 750 Mw? Hydro generator Turbo alternators Both a and b None of the above None Hint94). What are the main functions of an automatic voltage regulator system? Limiters Terminal voltage control Both a and b None of the above None Hint95). Which one of the following windings is more difficult to manufacture? Single layer windings Double layer windings Both a and b None of the above None Hint96). In which one of the following the isolated operation is possible? Synchronous generator Induction generator Both a and b None of the above None Hint97). Which one of the following comes under magnetic losses? Eddy current Friction loss Brush contact loss None of the above None Hint98). Which one of the following prime movers is used in the smooth cylindrical rotors? Electric motors Steam turbines Water turbines None of the above None Hint99). Which one of the following methods is also known as the EMF method? MMF method ZPF method Synchronous impedance method All of the above None Hint100). Which one of the following has less RPM? DC Generator Alternator Transformer None of the above None HintFor More MCQsDC Generator Question & Answers Time's up
