Induction Motor Question & Answers February 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 Hint 2). Induction Motor is a ________________? DC Motors Synchronous AC Motors Asynchronous AC Motors Compound DC Motors Hint 3). The actual speed is not equivalent to the motor's synchronous speed in ______? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 4). Synchronous speed is _____________ than the original speed of induction motors? Equal Greater Than Less Than Same Hint 5). 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 Hint Read More about Induction Motor 6). What is the principle involved in induction motors? Self Induction Electromagnetic Induction Rectification Amplification Hint 7). The rotation speed of the magnetic field in the rotary machines is ____________? Synchronous Speed Actual Speed Asynchronous Speed a & c Hint 8). How many supplies are given to operate Induction motors? Four Three Two One Hint 9). Which winding in the induction motor is powered with supply? Stator Rotor Commutator Brush Hint 10). Which winding in the induction motor magnetic field is produced? Stator Rotor Commutator Brush Hint 11). How many fluxes are generated in induction motors? Four Three Two One Hint 12). Which flux will lag in Induction motors? Stator Rotor Commutator Brush Hint 13). The motor begins to function without any force application is ________? Mutual Starting Self Starting Dependent Starting Synchronous Starting Hint 14). What are the types of Induction motors? Single Phase Three Phase Double Phase a & b Hint 15). Which motor does not have any electrical connection to the rotor? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 16). What are the types of Induction motors based on rotors type? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 17). The stator with thin steel lamination is present in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 18). How many power phases are required by induction motors of single-phase to operate? Four Three Two One Hint 19). Which part is rotating in induction motors? Stator Rotor Commutator Brush Hint 20). Induction motors are regarded as ___________? Rectifier Amplifier Transformer Filter Hint 21). What happens if induction motors run at a synchronized speed? No Cutting Flux No EMF Induced No Current All Mentioned Above Hint 22). Which motors cannot operate on lags and leads of power factors? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 23). What carries winding i.e., short-circuited in induction motors? Stator Rotor Commutator Brush Hint 24). Which windings produce magnetic-field in induction motors? Stator Rotor Commutator Brush Hint 25). Which conductors are fixed or stationary in induction motors? Stator Rotor Commutator Brush Hint Induction Motor MCQs for Students 26). Where is the torque developed in induction motors? Stator Rotor Commutator Brush Hint 27). The rotor and the magnetic field are rotated in __________ direction? Same Distinct Opposite None Hint 28). What happens to induction motors' speed as the load is increased? Decrease Increase Constant a & b Hint 29). Self-starting torques are present in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 30). The relative motion among rotor and stator RMFs is required in ____________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 31). Less starting torque is required in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 32). What are the major components of Induction motors? Stator Rotor Commutator a & b Hint 33). What is the input to induction motors? Electrical Energy Mechanical Energy Chemical Energy Physical Energy Hint 34). The magnetic field generated in induction motors is __________? Alternating Flowing Direct Rotating Hint 35). The Power factor is predetermined in _________? Rectifier Amplifier Transformer Induction Motors Hint 36). What is the power rating of induction motors? kVA kW VA K Ohms Hint 37). Which induction motor has low torque of starting? Single Phase Three Phase Double Phase a & b Hint 38). Which induction motors are less efficient? Single Phase Three Phase Double Phase a & b Hint 39). Which type of induction motor has a higher Power factor? Single Phase Three Phase Double Phase a & b Hint 40). What is the basic difference between a three-phase and single-phase induction motor? Simple to Construct Reliable Economical All Mentioned Above Hint 41). Which induction motor is expensive? Single Phase Three Phase Double Phase a & b Hint 42). Capacitor start and run induction motor belong to ________? Single Phase Three Phase Double Phase a & b Hint 43). Which motors are rotated using auxiliaries? Single Phase Three Phase Double Phase a & b Hint 44). What is Resistance Start Motor? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor Hint 45). 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 Hint 46). Which motors have higher torque at starting? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c Hint 47). Which is a self-starting 'single-phase induction motor'? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c Hint 48). Power loss is high in __________? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor b & c Hint 49). Why do Shaded-pole type induction motors have poor efficiency? Small Design Low Power Ratings Large Design a & b Hint 50). Power factor will be less in ______? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor Hint Induction Motor MCQs for Exams 51). Load requires speed controlling use ___________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 52). The copper losses are higher in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 53). The windings of the rotor are 'STAR' connected in __________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 54). Which are the widely utilized induction motors of three-phase? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 55). What requires resistors externally? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 56). Hair dryers have ____________? Shaded-pole Induction Motor Capacitor Run Induction Motor Capacitor Start Induction Motor Split-phase Induction Motor Hint 57). Which motors are utilized in Bridge cranes? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 58). VFD added to _____________for altering motor’s speed? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 59). Borewells have _________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 60). In how many classes the Squirrel-cage induction motors is divided? Four Three Two One Hint 61). Class A motor of induction motors have _________? Normal Torque of Starting Low Starting Current High Starting Current a & c Hint 62). What does a class B of induction motor contain? Normal Torque of Starting Low Starting Current Low Operational Slip All Mentioned Above Hint 63). Which class of induction motors has constant load speed? Class D Class C Class B Class A Hint 64). Which motor is present in the crusher & compressor? Class D Class C Class B Class A Hint 65). The conveyors have ____________ type induction motors? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 66). Which class has the highest torques at starting? Class D Class C Class B Class A Hint 67). The rotor conductors will be short-circuited with heavy rings at the end in _________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 68). What are the advantages of a Squirrel cage rotor? High-Efficiency High Power Factor Less Maintenance All Mentioned Above Hint 69). Which class of motors has higher operating slips? Class D Class C Class B Class A Hint 70). Which class of motors is utilized in Bulldozers? Class D Class C Class B Class A Hint 71). Which type of induction motors are utilized in elevators? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 72). Speed control is difficult in __________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 73). Why do slip-ring induction motors have better-starting torques? External Resistor Presence External Capacitor Presence External Inductor Presence External Diode Presence Hint 74). Rush currents are high in ________? Single Phase Three Phase Double Phase a & b Hint 75). Which motors are operated in polluted environments? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint Induction Motor MCQs for Interviews 76). What happens if air gap gets increased in an induction motor? Magnetizing Current Decreases Power Factor Decreases Motor Speed Increases Winding Loss Increases Hint 77). Increase in air-gap of induction motors increases _______? Magnetizing Inductance Magnetic Circuit Permeability Leakage Flux Power Factor Hint 78). Which motors is works as a single-excited motor? DC Motors Synchronous AC Motors Squirrel-cage Three Phase Motor Servo Motor Hint 79). Which motors are maintenance-free? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 80). Why the induction motor is less costly? Brushes are Absent Commutators are Absent Absent Slip Rings All Mentioned Above Hint 81). Lifts & cranes use _________? Single Phase Three Phase Double Phase a & b Hint 82). Low-power applications use ___________? Single Phase Three Phase Double Phase a & b Hint 83). Air gap is required in ________? Rectifier Amplifier Transformer Induction Motor Hint 84). Mechanical loads are driven by ___________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 85). Which motors are considered economical? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 86). Which motor can be constructed without any complexities? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 87). Which motors are operated only at lag power factors? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 88). Which motor is a Single-excited machine? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 89). Which induction motors are most frequently used? Single Phase Three Phase Double Phase a & b Hint 90). High starting torques based loads use___________? Squirrel Cage Motor Slip Ring Motor a & b DC Motors Hint 91). Pump uses ___________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 92). Which motors suffer from a slip? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 93). Efficiency is less in _________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 94). What is the most commonly used motor in water wells? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 95). Which induction motors are utilized if loads are small? Single Phase Three Phase Double Phase a & b Hint 96). Three-phase squirrel-cage Induction motors are ___________? Self-starting Reliable Economical All Mentioned Above Hint 97). Household refrigerators have ____________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 98). The ceiling fans use ______________? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 99). Which motors are utilized in water pumps? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint 100). Which motor is referred to as Rotating Transformer? DC Motors Synchronous AC Motors Induction Motors Compound DC Motors Hint For More MCQs Reluctance Motor Question & Answers Switched Reluctance Motor Question & Answers DC Motor Question & Answers Synchronous Motor Question & Answers Single Phase Induction Motor Question & Answers Poly Phase Induction Motor Question & Answers Time's up
