Synchronous Motor Question & Answers October 11, 2021 By Wat Electrical This article lists 100 Synchronous Motor MCQs for engineering students. All the Synchronous Motor Questions & Answers given below includes solution and link wherever possible to the relevant topic. A motor is an electrical component or system that transduces electrical input to a mechanical output used in small to larger electrical appliances. They are classified into 2 types AC type electric motor, and DC type electric motor. As power factor plays a major role in any electrical appliances that are the ratio of power applied to the power required. A synchronous motor is a classification of AC type electric motor that maintains the power factor as “1”. This motor comprises of stator and rotor as the main components responsible for the operation of the motor on the interaction between stator and rotors magnetic fields. A synchronous type electric motor operates at a steady based state, where the shaft rotation is in synchronization with applied currents frequency. They are further classified based on rotors magnetization property as direct current excited motors like permanent magnet synchronous motor, reluctance type motor and hysteresis motor; and non-excited motor. The advantages provided by the synchronous motor are its unity power factor and operating at a constant speed. But limit in terms of more DC excitation requirements and the absence of self-starting property. They are employed in fields of ball mills, robot actuators, record players, fans, etc. 1). A motor converts ___ energy in to mechanical energy? Electrical Chemical Liquid Gaseous Hint 2). A motor is a ___ type of device? Electrical Mechanical Electro mechanical All the above Hint 3). A motor based on power source is classified into _____ types? 4 3 2 1 Hint 4). An AC type motor are classified in to ___ types? 1 2 3 4 Hint 5). A DC type motor is classified into ____ types? 1 2 3 4 Hint 6). The speed of asynchronous type motor is ___ than synchronous type motor? Equal High Low Zero Hint Read more about synchronous type motor 7). A asynchronous type motor is also called as ____? Induction motor DC excited motor Reluctance motor All the above Hint 8). Which of the following are the components of an induction motor? Stator Rotor Load All the above Hint 9). Which of the following component of an induction motor holds 3phase of supply? Stator Rotor Load All the above Hint 10). An induction motor operates with ___ number of phases? 1 2 3 Multi Hint 11). Which of the following component of an induction motor holds windings with shorted? Stator Rotor Load All the above Hint 12). Which of the following component in induction motor is at stationary while operation? Rotor Stator Load All the above Hint 13). Which of the following component in induction motor is at dynamic while operation? Rotor Stator Load All the above Hint 14). Which of the following is induced when asynchronous motor operates? Electric field Magnetic field Electro magnetic field All the above Hint 15). Which of the following component of asynchronous type motor is energized to induce emf in the motor? Rotor Stator Load All the above Hint 16). In asynchronous type motor the magnetic type field flows through ___ parts of rotor conductors? Cuts Air gaps Holes Both a and b Hint 17). Magnetic field in asynchronous type motor is generated by ____ windings? Rotors Stators Loads Both a and b Hint Read more about the stator 18). Torque in asynchronous type motor during its operation is developed on___? Stator windings Rotors conductors Magnet Load Hint Read More about rotor 19). A motor which rotates at synchronous based speed of rotating type magnetic field is called___ motor? Synchronous Asynchronous Induction All the above Hint 20). A synchronous type motor has a speed of ____ limit? Zero Constant Variable Infinity Hint 21). At which condition do synchronous type motor reaches rest? Load is greater on shaft of motor Load is equal on shaft of motor Load is less on the shaft of motor No load condition Hint 22). Which of the following are the components of a synchronous type motor? Rotor Stators Load All the above Hint 23). An synchronous type motor operates on ___ phase? 1 2 3 Multi Hint Read more about 3-phase 24). Which of the following motor is named as double fed on independently exited with multiphase type AC based electromagnets on there stator and rotor? Synchronous motor Asynchronous motor Induction motor Both b and c Hint 25). Which of the following are the applications of synchronous type motor? Timers Clocks Stepper motor All the above Hint Synchronous Motor Important MCQs 26). A synchronous non excited type motor is made of ____ material? Steel Copper Aluminum Iron Hint 27). At a synchronous based speed the non excited type motor rotates with respect to ___ components magnetic field? Stators Rotors Loads All the above Hint 28). The external rotor component of non excited type motor has ___ property? High retentivity High resistance High impedance High conductance Hint 29). The external rotor type non excited type motor is made up of ___ substance? Steel Copper Cobalt Both a and b Hint 30). In which of the following designs is a non excited type motor designed on? Reluctance Hysteresis Permanent magnet All the above Hint 31). Which of the following design of non excited type motor contains solid steel based casting with projecting type toothed poles? Reluctance Hysteresis Permanent magnet All the above Hint 32). A reluctance based design of non excited type motor has fewer____ components? Stator Rotor Windings All the above Hint 33). A reluctance based design of non excited type motor has many____ components? Stator Rotor Windings All the above Hint 34). Which of the following factor is minimized with fewer rotor in reluctance motors? Torque ripple Distortion Magnetism All the above Hint 35). Which of the following is power rating of reluctance motor? 22kW 20KW 33KW 30KW Hint 36). A small reluctance type motor has ____ value of torque? High Low Zero Medium Hint 37). Which of the following parameter is used for determining motors speed? Supply power Load Resistance Rotors Hint 38). A torque ripple refers to ___ output torque? Increase Decrease Zero Both a and b Hint 39). A torque ripple is measured as ____? Percentage Grams Centimeters Newton’s Hint 40). A reluctance motor has ___ magnetic poles? Permanent Non permanent Both a and b Zero magnetic Hint 41). A reluctance motor do not have_____? Stator Rotor Windings Both a and b Hint 42). A reluctance motor is classified as _____? Synchronous Variable Switched All the above Hint 43). A reluctance motor has ____ power density? High Low Zero Constant Hint 44). Which of the following are is the disadvantage provided by reluctance motor? High torque ripple Low speed High noise All the above Hint 45). A synchronous type reluctance motor has _____ equal poles? Rotor Stator Magnetic Both a and b Hint Read more about reluctance motor 46). How many poles do a reluctance type synchronous motor have? 2 4 6 Both b and c Hint 47). A rotor in reluctance type synchronous motor operates at ____ speed? Synchronous Asynchronous Linear Constant Hint 48). The losses in reluctance type synchronous motor has _____ quantity of losses compared to induction type motor? Minimal Maximum Zero Constant Hint 49). A switched type reluctance motor is a type of ____ motor? Stepper motor Compound motor Shunt exited motor All the above Hint Read more about stepper type motor 50). The phase based windings in an SRM are electrically ____? Joined Isolated Separated Both b and c Hint Synchronous Motor MCQs for Exams 51). Which of the following are the applications of a reluctance type motor? Hard disk drive type motor Electric type vehicle Analog electric meter All the above Hint 52). Which of the following are the tools application of reluctance type motor? Lathes Drill pressures Band saws All the above Hint 53). A reluctance type motor has ____ fault tolerance? High Low Zero Equal Hint 54). A reluctance type motor produces non linear ___ type of wave? Square Sinusoidal Triangular Both a and b Hint 55). A non excited type motor operates at ____rpm? 1800 1200 1000 1500 Hint 56). Which of the following are the components of a squirrel cage type induction motor? Cylinder of steel lamination Copper conductors Aluminum conductors All the above Hint 57). A wound type rotor motor is also called ___? Slip ring type rotor based motor Inductor motor Ac motor All the above Hint 58). A wound type rotor motor has ____ starting torque? High Low Zero Constant Hint 59). A squirrel cage motor has ____ starting torque? High Low Zero Constant Hint 60). A slip ring type motor has ___ turns of windings? More Less Zero Depends Hint 61). Which of the following parameter is varied for adjusting torque and speed of a wound type rotor motor? Voltage Current Resistance Both a and b Hint 62). A split phase induction motor operates on splitting __ phase into 2 phases? Single Two Three Multi Hint 63). Which of the following components are present in a single cage induction type motor? Stator Rotor Load Both a and b Hint 64). A stator of single cage induction motor contains ____ windings? Main Auxiliary Primary All the above Hint 65). At what angles in single cage induction motor do primary and secondary windings are arranged? 45degrees 90degrees 75degrees 120degrees Hint 66). Which of the following are the different types of single cage induction motor? Capacitor start Permanent capacitor Resistance split phase All the above Hint 67). A split phase induction motor work likely as ______ motor? Squirrel cage motor Polyphase induction motor Single phase induction motor Both b and c Hint 68). Which of the following are the components of split phase induction motor? Series resistor Inductive reactance Auxiliary windings All the above Hint 69). At the start of split phase motor the primary and auxiliary windings align ____ way? Serial Parallel 45degrees Both a and b Hint 70). A split phase motor takes ___ percent of synchronous based speed? 60% 70% 80% Both a and b Hint 71). At what input power given to split phase motor centrifugal switch disconnects starting winding? 90Watts 100Watts 50Watts 99Watts Hint 72). Which of the following are the advantages of split phase induction motor? Economical Available in many frames Provides better efficiency All the above Hint 73). Which of the following are the disadvantages of split phase induction motor? Less starting torque Depends on inductance and resistance value More output power All the above Hint 74). What is the phase difference of a split phase induction motor? 50 30 90 45 Hint 75). The current in split phase motor____ voltage according to its phasor diagram? Leads Lags Cancels out 180 degrees out of phase Hint Synchronous Motor MCQs for Quiz 76). Which of the following are the applications of a split phase motor? AC fans Applications in absence of 3phases Mixer grinder All the above Hint 77). A hysteresis type motor is classified into ___ types? 2 3 4 5 Hint Read more about hysteresis 78). Which of the following are the major components of hysteresis type motor? Rotor Stator Load Both a and b Hint 79). A single phase type hysteresis type motor is classified in to ___ types? 2 3 4 5 Hint 80). Which of the following is the advantages provided by shaded pole type hysteresis motor? Minimal cost Minimal cost Less noisy All the above Hint 81). Which of the following is the disadvantages provided by shaded pole type hysteresis motor? Minimal cost Non-uniform torque Noisy Both b and c Hint 82). Which of the following is the advantage provided by split capacitive based motor? 2 phase supply is given Uniform torque Noiseless operation All the above Hint 83). Which of the following is the disadvantage provided by split capacitive based motor? More space required High cost Noisy Both a and b Hint 84). The rotor component in hysteresis motor is made up of ____ substance? Steel Cobalt Iron Both a and b Hint 85). A hysteresis motor has ____ quantity of hysteresis loop? Small Large Medium Infinite Hint 86). Which of the following losses are minimized in a hysteresis motor? Eddy current Mechanical Magnetic Brush Hint 87). Which of the following component is used to minimize the weight property of hysteresis motor? Magnet Non magnet substance Spider substance Both b and c Hint 88). A non magnetic substance in hysteresis type motor is made up of ___ substance? Iron Aluminum Nickle Both a and b Hint 89). Which of the following is the advantage provide by spider substance in hysteresis type motor? Lightens the motor Enhances speed Minimizes value of inertia All the above Hint 90). Which of the following is the formula for Eddy current in a hysteresis motor? P e = k e f 2 2 B 2 P e = k e f 2 B P e = k e f 2 2 B Hint 91). Which of the following is the torque equation of hysteresis motor? T 2 e = k’ s T e = k’ s T e = k’ T 2 e = s Hint 92). The value of torque produced during initial and final stage of hysteresis motor is ___ value? Greater Lesser Equal Zero Hint 93). The value of torque produced by hysteresis motor at synchronous speed is ___ value? Greater Lesser Equal Constant Hint 94). At which condition of hysteresis motor operates noiselessly? Rotor starting torque equal to pull put type torque Rotor starting torque greater to pull put type torque Rotor starting torque lesser to pull put type torque Rotor starting torque nullify with pull put type torque Hint 95). Which of the following are the advantages provided by a hysteresis type motor? Noiseless operation Zero mechanical vibrations Compatible for accelerating inertia based loads All the above Hint 96). Which of the following are the disadvantages provided by a hysteresis type motor? Less torque Small size Obtains output of ¼ compared to induction type motor All the above Hint 97). Which of the following are the applications of hysteresis type motor? Timing devices Record players Electric clocks All the above Hint 98). Which of the following is the reason for hysteresis in hysteresis type motor? Magnetization Demagnetization Load Both a and b Hint 99). Which of the following are the applications of electric type motor? Paper mills Turbines Mover All the above Hint 100). Which of the following are electric DC motor ? Brushless motors Brushed motors Wound field type motor All the above Hint Time's up
