Induction Motor Question & AnswersFebruary 1, 2023 By Wat Electrical This article lists 100 Induction Motor MCQs for engineering students. All the Induction Motor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Induction Motors.In the present era, electrical equipment and electricity play a significant role. Imagine life without them is practically hard. One of those electrical devices is the motor. Motors can be AC and DC. Compared to Dc the usage of Ac motors is more frequent and prevalent. For everyday applications various motors of Ac are available. Based on the specifications AC motors are categorized. Considering the operating principle of AC motors. These are classified as Synchronous, Asynchronous, and commutator motors. If the rotation speed of stators is equivalent to its rotor's speed, then this motor is called Synchronous.In Asynchronous motors, the rotor is passive i.e., permanently short-circuited or temporary. Several megawatts are produced by these motors. It can be used frequently as a three-phase motor in Industrial areas. Induction motors belong to the category of Asynchronous motors.The electric current in rotors produces a torque that is due to the electromagnetic induction from the magnetic field of stator windings in an Induction motor. These motors are also manufactured without having any electrical connection to the rotor. These motors are either squirrel-cage or wound types. 1). Which motors can be powered by stators? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint2). Induction Motor is a ________________? DC Motors Synchronous AC Motors Asynchronous AC Motors Compound DC Motors None Hint3). The actual speed is not equivalent to the motor's synchronous speed in ______? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint4). Synchronous speed is _____________ than the original speed of induction motors? Equal Greater Than Less Than Same None Hint5). Which motor has the conductors of the rotor short-circuited at the ring's end? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None HintRead More about Induction Motor 6). What is the principle involved in induction motors? Self Induction Electromagnetic Induction Rectification Amplification None Hint7). The rotation speed of the magnetic field in the rotary machines is ____________? Synchronous Speed Actual Speed Asynchronous Speed a & c None Hint8). How many supplies are given to operate Induction motors? Four Three Two One None Hint9). Which winding in the induction motor is powered with supply? Stator Rotor Commutator Brush None Hint10). Which winding in the induction motor magnetic field is produced? Stator Rotor Commutator Brush None Hint11). How many fluxes are generated in induction motors? Four Three Two One None Hint12). Which flux will lag in Induction motors? Stator Rotor Commutator Brush None Hint13). The motor begins to function without any force application is ________? Mutual Starting Self Starting Dependent Starting Synchronous Starting None Hint14). What are the types of Induction motors? Single Phase Three Phase Double Phase a & b None Hint15). Which motor does not have any electrical connection to the rotor? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint16). What are the types of Induction motors based on rotors type? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint17). The stator with thin steel lamination is present in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint18). How many power phases are required by induction motors of single-phase to operate? Four Three Two One None Hint19). Which part is rotating in induction motors? Stator Rotor Commutator Brush None Hint20). Induction motors are regarded as ___________? Rectifier Amplifier Transformer Filter None Hint21). What happens if induction motors run at a synchronized speed? No Cutting Flux No EMF Induced No Current All Mentioned Above None Hint22). Which motors cannot operate on lags and leads of power factors? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint23). What carries winding i.e., short-circuited in induction motors? Stator Rotor Commutator Brush None Hint24). Which windings produce magnetic-field in induction motors? Stator Rotor Commutator Brush None Hint25). Which conductors are fixed or stationary in induction motors? Stator Rotor Commutator Brush None HintInduction Motor MCQs for Students26). Where is the torque developed in induction motors? Stator Rotor Commutator Brush None Hint27). The rotor and the magnetic field are rotated in __________ direction? Same Distinct Opposite None None Hint28). What happens to induction motors' speed as the load is increased? Decrease Increase Constant a & b None Hint29). Self-starting torques are present in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint30). The relative motion among rotor and stator RMFs is required in ____________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint31). Less starting torque is required in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint32). What are the major components of Induction motors? Stator Rotor Commutator a & b None Hint33). What is the input to induction motors? Electrical Energy Mechanical Energy Chemical Energy Physical Energy None Hint34). The magnetic field generated in induction motors is __________? Alternating Flowing Direct Rotating None Hint35). The Power factor is predetermined in _________? Rectifier Amplifier Transformer Induction Motors None Hint36). What is the power rating of induction motors? kVA kW VA K Ohms None Hint37). Which induction motor has low torque of starting? Single Phase Three Phase Double Phase a & b None Hint38). Which induction motors are less efficient? Single Phase Three Phase Double Phase a & b None Hint39). Which type of induction motor has a higher Power factor? Single Phase Three Phase Double Phase a & b None Hint40). What is the basic difference between a three-phase and single-phase induction motor? Simple to Construct Reliable Economical All Mentioned Above None Hint41). Which induction motor is expensive? Single Phase Three Phase Double Phase a & b None Hint42). Capacitor start and run induction motor belong to ________? Single Phase Three Phase Double Phase a & b None Hint43). Which motors are rotated using auxiliaries? Single Phase Three Phase Double Phase a & b None Hint44). What is Resistance Start Motor? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor None Hint45). Which induction motor is used for higher loads of inertia? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor None Hint46). Which motors have higher torque at starting? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c None Hint47). Which is a self-starting 'single-phase induction motor'? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c None Hint48). Power loss is high in __________? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c None Hint49). Why do Shaded-pole type induction motors have poor efficiency? Small Design Low Power Ratings Large Design a & b None Hint50). Power factor will be less in ______? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor None HintInduction Motor MCQs for Exams51). Load requires speed controlling use ___________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint52). The copper losses are higher in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint53). The windings of the rotor are 'STAR' connected in __________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint54). Which are the widely utilized induction motors of three-phase? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint55). What requires resistors externally? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint56). Hair dryers have ____________? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor None Hint57). Which motors are utilized in Bridge cranes? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint58). VFD added to _____________for altering motor’s speed? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint59). Borewells have _________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint60). In how many classes the Squirrel-cage induction motors is divided? Four Three Two One None Hint61). Class A motor of induction motors have _________? Normal Torque of Starting Low Starting Current High Starting Current a & c None Hint62). What does a class B of induction motor contain? Normal Torque of Starting Low Starting Current Low Operational Slip All Mentioned Above None Hint63). Which class of induction motors has constant load speed? Class D Class C Class B Class A None Hint64). Which motor is present in the crusher & compressor? Class D Class C Class B Class A None Hint65). The conveyors have ____________ type induction motors? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint66). Which class has the highest torques at starting? Class D Class C Class B Class A None Hint67). The rotor conductors will be short-circuited with heavy rings at the end in _________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint68). What are the advantages of a Squirrel cage rotor? High-Efficiency High Power Factor Less Maintenance All Mentioned Above None Hint69). Which class of motors has higher operating slips? Class D Class C Class B Class A None Hint70). Which class of motors is utilized in Bulldozers? Class D Class C Class B Class A None Hint71). Which type of induction motors are utilized in elevators? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint72). Speed control is difficult in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint73). Why do slip-ring induction motors have better-starting torques? External Resistor Presence External Capacitor Presence External Inductor Presence External Diode Presence None Hint74). Rush currents are high in ________? Single Phase Three Phase Double Phase a & b None Hint75). Which motors are operated in polluted environments? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None HintInduction Motor MCQs for Interviews76). What happens if air gap gets increased in an induction motor? Magnetizing Current Decreases Power Factor Decreases Motor Speed Increases Winding Loss Increases None Hint77). Increase in air-gap of induction motors increases _______? Magnetizing Inductance Magnetic Circuit Permeability Leakage Flux Power Factor None Hint78). Which motors is works as a single-excited motor? DC Motors Synchronous AC Motors Squirrel-cage Three Phase Motor Servo Motor None Hint79). Which motors are maintenance-free? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint80). Why the induction motor is less costly? Brushes are Absent Commutators are Absent Absent Slip Rings All Mentioned Above None Hint81). Lifts & cranes use _________? Single Phase Three Phase Double Phase a & b None Hint82). Low-power applications use ___________? Single Phase Three Phase Double Phase a & b None Hint83). Air gap is required in ________? Rectifier Amplifier Transformer Induction Motor None Hint84). Mechanical loads are driven by ___________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint85). Which motors are considered economical? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint86). Which motor can be constructed without any complexities? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint87). Which motors are operated only at lag power factors? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint88). Which motor is a Single-excited machine? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint89). Which induction motors are most frequently used? Single Phase Three Phase Double Phase a & b None Hint90). High starting torques based loads use___________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors None Hint91). Pump uses ___________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint92). Which motors suffer from a slip? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint93). Efficiency is less in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint94). What is the most commonly used motor in water wells? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint95). Which induction motors are utilized if loads are small? Single Phase Three Phase Double Phase a & b None Hint96). Three-phase squirrel-cage Induction motors are ___________? Self-starting Reliable Economical All Mentioned Above None Hint97). Household refrigerators have ____________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint98). The ceiling fans use ______________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint99). Which motors are utilized in water pumps? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None Hint100). Which motor is referred to as Rotating Transformer? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors None HintFor More MCQsReluctance Motor Question & AnswersSwitched Reluctance Motor Question & AnswersDC Motor Question & AnswersSynchronous Motor Question & AnswersSingle Phase Induction Motor Question & AnswersPoly Phase Induction Motor Question & Answers Time's up
