Single Phase Induction Motor Question & AnswersSeptember 27, 2021 By Wat Electrical Leave a Comment This article lists 100 Single Phase Induction Motor MCQs for Engineering Students. All the Single Phase Induction Motor Questions & Answers given below includes solution and link wherever possible to the relevant topic.The single-phase induction motor converts electrical energy into mechanical energy, it consists of two parts namely rotor and stator. The single-phase induction motors are not self-starting machines, if you want to rotate as a self-starting machine then we have some mechanical constructions they are resistance split-phase, capacitor-start, capacitor start & capacitor run, and shaded pole motors 1). The single-phase induction motors are categorized into _________________OneTwoThreeFourHintThe single-phase induction motors are categorized into three types they are split phase, shaded pole type, and capacitor type motors 2). Which one of the following is a type of synchronous motor?HysteresisSplit phaseShaded poleAll of the aboveHintThe hysteresis motor is a type of synchronous motor 3). What is the standard form of DOR?Direction of RotationDirection Online RotationDirection RotorNone of the aboveHintThe standard form of DOR is Direction of Rotation 4). The capacitor motors are categorized into _________________OneTwoThreeFourHintThe capacitor motors are categorized into three types they are capacitor start induction run, capacitor run induction motor, and capacitor start and capacitor run induction motor 5). What are the parts of the repulsion motor?Stator, rotorCommutatorCarbon brushesAll of the aboveHintThe rotor, commutator, stator, and carbon brushes are the parts of the repulsion motor 6). ________________ are the two different designs of repulsion motorsBrush lifting type and brush riding typeBrushed and brushless motorsVariable and permanent induction motorsAll of the aboveHintThe brush lifting type and brush riding type are the two different designs of repulsion motors 7). ________________ are the starting methods of single-phase induction motorsSplit phaseShaded poleReluctance startAll of the aboveHintThe split-phase, shaded pole, and reluctance start are the starting methods of single-phase induction motors 8). ________________ are the different split-phase techniquesSplit phase resistance start motorSplit phase capacitor start motorPermanent single capacitor & capacitor start capacitor run induction motorAll of the aboveHintThe split-phase resistance start motor, split-phase capacitor start motor, and the permanent single capacitor & capacitor start capacitor run induction motor are the different split-phase techniques 9). The repulsion motors are categorized into _________________ typesOneTwoThreeFourHintThe repulsion motors are categorized into two types they are repulsion start induction run motor and repulsion induction motor 10). Which one of the following motors requires DC excitation at the rotor?Synchronous motor3-phase induction motorBoth a and bNone of the aboveHintThe synchronous motors require DC excitation at the rotor Read more about Rotor 11). What is the standard form of SYRM?Synchronous Reluctance MotorAsynchronous Reluctance MotorSwitching Reluctance MotorNone of the aboveHintThe standard form of SYRM is Synchronous Reluctance Motor 12). The starting torque is more in ______________ motorSynchronous motor3-phase induction motorBoth a and bNone of the aboveHintThe starting torque is more in synchronous motor compare to 3-phase induction motor 13). What is the standard form of SCR?Silicon Controlled RectifierSwitch Controlled RectifierSingle phase Controlled RectifierNone of the aboveHintThe standard form of SCR is Silicon Controlled Rectifier 14). How many states does the silicon control rectifier have?OneTwoThreeFourHintThe silicon control rectifier has three states they are forward blocking mode, reverse blocking mode, and forward conducting mode 15). What are the advantages of a single-phase induction motor?Less expensiveReliableEasy to maintain and repairAll of the aboveHintThe single-phase induction motors are less expensive, reliable, and easy to maintain & repair 16). ________________ are the most common applications of shaded pole motorExhaust fansTable fansCooling fansAll of the aboveHintThe exhaust fans, table fans, cooling fans, etc are the most common applications of shaded pole motor 17). The permanent split capacitor motors are used to ______________Drive refrigerator compressorsOperate office machineryBoth a and bNone of the aboveHintThe permanent split capacitor motors are used to drive refrigerator compressors and operate office machinery 18). How many centrifugal switches are required in a single-value capacitor motor?OneTwoThreeNot requiredHintThe centrifugal switches are not required in a single-value capacitor motor 19). Which one of the following motor construction is complicated?Synchronous motor3-phase induction motorBoth a and bNone of the aboveHintThe synchronous motor construction is complicated whereas the construction of a 3-phase induction motor is easy 20). The single value capacitor motor has ______________ efficiencyHigherLowerVery lowerModerateHintThe single value capacitor motor has higher efficiency 21). The two value capacitor motors are used in _____________Pumping equipmentAir compressorsRefrigerationAll of the aboveHintThe two value capacitor motors are used in pumping equipment, air compressors, refrigeration, etc 22). The split-phase motors are used in _______________GrindersBlowersSmall drillsAll of the aboveHintThe split-phase motors are used in grinders, blowers, small drills, etc 23). In single-phase induction motor ______________ theory is used to find the performance of the 1-phase induction motorDouble revolving field theoryCross-field theoryBoth a and bNone of the aboveHintIn single-phase, induction motor double-revolving field and cross-field theories are used to find the performance of the 1-phase induction motor 24). The one phase induction motor consist cage winding on _________StatorRotorBoth a and bNone of the aboveHintThe one phase induction motor consists of cage winding on rotor 25). The stator core, outer frame, and stator winding are the parts of ____________StatorRotorBoth a and bNone of the aboveHintThe stator core, outer frame, and stator winding are the parts of the statorSingle-phase Induction Motor MCQs with Hints 26). The rotor core and rotor winding are the parts of ____________StatorRotorBoth a and bNone of the aboveHintThe rotor core and rotor winding are the parts of the rotor 27). The winding arrangement is complex in _________________StatorRotorBoth a and bNone of the aboveHintThe winding arrangement is complex in the stator 28). The single value capacitor motor has ______________ power factorHigherLowerVery lowerModerateHintThe single value capacitor motor has a higher power factor 29). What is the standard form of CSIR?Capacitor Start Induction RunCapacitor Start Induction RotorCapacitor Stator Induction RunNone of the aboveHintThe standard form of CSIR is Capacitor Start Induction Run 30). The maximum power output divided by full load output is known as _____________Specific electricOverload capacityTotal magneticNone of the aboveHintThe maximum power output divided by full load output is known as overload capacity 31). The rate power of single-phase induction motors is around ______________10W15W60WNone of the aboveHintThe rate power of single-phase induction motors is around 60W 32). The ratio of total flux around the air gap divided by area of flux path at the air gap is known as ____________ loadingSpecific electricOverload capacityTotal magneticSpecific magneticHintThe ratio of total flux around the air gap divided by the area of flux path at the air gap is known as specific magnetic loading 33). The repulsion induction motor consists of _____________Two rotor windingsStator windingShort circuited set of two brushesAll of the aboveHintThe repulsion induction motor consists of two rotor windings, stator winding, and short-circuited set of two brushes 34). The single value capacitor motor has ______________ pull out torqueHigherLowerVery lowerModerateHintThe single value capacitor motor has higher pull out torque 35). The one phase induction motor consists single-phase winding on _________StatorRotorBoth a and bNone of the aboveHintThe one phase induction motor consists of single-phase winding on the stator 36). How many types of induction motor rotors are there?OneTwoThreeFourHintThere are two induction motor rotors are there they are wound rotor or slip ring and squirrel cage rotor 37). The speed of the induction motors (IM) is given as _____________N=1f/p(1-S)N=10f/p(1-S)N=120f/p(1-S)None of the aboveHintThe speed of the induction motors (IM) is given as N=120f/p(1-S) 38). What are the disadvantages of an induction motor?Low-efficiencyLow power densityLarge sizeAll of the aboveHintThe disadvantages of an induction motor are it has low efficiency, low power density, and large size 39). The magnitude of step angle for PM and VM stepper motors is given by ______________360/(number of starter phases)*(number of rotor poles)360/(number of starter phases-number of rotor poles)360/(number of starter phases + number of rotor poles)None of the aboveHintThe magnitude of step angle for PM and VM stepper motors is given by 360/(number of starter phases)*(number of rotor poles) 40). What are the advantages of a hybrid stepper motor?High-efficiencySmall step lengthLess tendency to resonateAll of the aboveHintThe hybrid stepper motor has high efficiency, small step length, and less tendency to resonate 41). What are the disadvantages of a hybrid stepper motor?CostlyHigh inertiaBoth a and bNone of the aboveHintThe hybrid stepper motor are costly and have high inertia 42). The resistance start motor is also known as ______________ motorSplit phaseShaded poleCapacitorAll of the aboveHintThe resistance start motor is also known as split phase motor 43). What is the standard form of CSCR?Capacitor Start Capacitor Run Induction MotorCapacitor Slipring Capacitor Run Induction MotorCapacitor Switch Capacitor Run Induction MotorNone of the aboveHintThe standard form of CSCR is Capacitor Start Capacitor Run Induction Motor 44). What is the standard form of WRIM?Wound Rotor Induction MotorWound Resistance Induction MotorWound Rectifier Induction MotorNone of the aboveHintThe standard form of WRIM is Wound Rotor Induction Motor 45). The speed control is not possible in ______________ motorInduction motorSynchronous motorBoth a and bNone of the aboveHintThe speed control is not possible in a synchronous motor 46). In single phase motor the starting winding is placed in _________________RotorStatorBoth a and bNone of the aboveHintIn a single-phase motor the starting winding is placed in the stator 47). _____________ methods are employed for speed control of universal motorsResistance methodTapping field methodBoth a and bNone of the aboveHintThe resistance method and tapping field methods are employed for speed control of universal motors 48). The universal motors are manufactured in ____________________ typesOneTwoThreeFourHintThe universal motors are manufactured in two types they are distributed field compensated type and concentrated pole, and non-compensated field 49). The split-phase induction motors are used in _____________BlowersLathe machineGrindersAll of the aboveHintThe split-phase induction motors are used in blowers, lathe machines, grinders, etcRead more about Electric Motor 50). What is the standard form of PSC motor?Permanent Split CapacitorPermanent Switch CapacitorPermanent Start CapacitorNone of the aboveHintThe standard form of PSC motor is Permanent Split CapacitorSingle-phase Induction Motor MCQs for Exams 51). What are the advantages of a permanent split capacitor motor?Centrifugal switch is not requiredHigh-efficiencyHas higher pull-out torqueAll of the aboveHintThe permanent split capacitor motor has high efficiency, higher pull out torque, and the centrifugal switch is not required 52). What is the standard form of PSC?Permanent Split Capacitor Induction MotorPermanent Switch Capacitor Induction MotorPermanent Stator Capacitor Induction MotorNone of the aboveHintThe standard form of PSC is Permanent Split Capacitor Induction Motor 53). The repulsion type motors are divided into ___________ categoriesOneTwoThreeFourHintThe repulsion type motors are divided into four categories they are compensated repulsion motor, repulsion IM, repulsion motor, and repulsion start induction run motor 54). The horsepower ranges of split-phase motors is from ____________1/2 to 1/31/20 to 1/31/20 to 1/301/200 to 1/300HintThe horsepower ranges of split-phase motors is from 1/20 to 1/3 55). What is the standard form of WRSM?Wound Rotor Synchronous MotorWound Rotor Switching MotorWound Rotor Squirrel cage MotorNone of the aboveHintThe standard form of WRSM is Wound Rotor Synchronous Motor 56). The load starting ability is ______________ in capacitor start induction runEasyHardVery easyModerateHintThe load starting ability is hard in capacitor start induction run 57). The starting current in split-phase motors is __________HighLowVery lowModerateHintThe starting current in split-phase motors is high 5 to 7 times of full load current 58). The capacitor start capacitor run motor used in ______________Barn cleanerConveyorElevatorAll of the aboveHintThe capacitor start capacitor run motor used in barn cleaner, conveyor, elevator, etc 59). Which one of the following motors has low reliability?Brushed DC motorBLDCPMSMNone of the aboveHintThe brushed DC motors have low reliability compared to other motors 60). Which one of the following motors has poor field weakening?Brushed DC motorPMSMBoth a and bNone of the aboveHintThe both brushed DC and PMSM motors have poor field weakening 61). The brushed DC motor have __________ overloading capacityLowVery highHighModerateHintThe brushed DC motor has a low overloading capacity 62). The repulsion motor consist of _____________ partsOne rotor, commutatorSet of brushesOne stator windingAll of the aboveHintThe repulsion motor consist of one rotor, commutator, set of brushes, and one stator winding parts 63). The horsepower ranges of capacitor start induction run motors is from ____________1/2 to 1/31/20 to 1/31/20 to 1/301/8 to 10HintThe horsepower ranges of capacitor start induction run motors is from 1/8 to 10 64). The starting current in capacitor start induction run motors is __________HighLowVery lowMediumHintThe starting current in capacitor start induction run motors is medium 3 to 6 times of full load current 65). The brushed DC motor have __________ heat dissipationLowVery highHighModerateHintThe brushed DC motor has low heat dissipation 66). The electrical noise in induction motor is ____________HighVery highLowModerateHintThe electrical noise in induction motor is low compare to other motors 67). What is the standard form of SCIM?Switch Cage Induction MotorSquirrel Cage Induction MotorStator Cage Induction MotorNone of the aboveHintThe standard form of SCIM is Squirrel Cage Induction Motor 68). The load starting ability is ______________ in split-phase motorEasyHardVery hardModerateHintThe load starting ability is easy in split-phase motor 69). Which one of the following can’t be used as a synchronous condenser?Induction motorSynchronous motorBoth a and bNone of the aboveHintThe induction motor can’t be used as a synchronous condenser 70). The speed in 3-phase induction motor is ______________Remains constantDecreases with loadAlways zeroAlways oneHintThe speed in 3-phase induction motor decreases with load 71). The repulsion start induction run motor consist of _____________ partsOne rotor, commutatorCentrifugal mechanismOne stator windingAll of the aboveHintThe repulsion start induction run motor consist of one rotor, commutator, centrifugal mechanism, and one stator winding parts 72). The horsepower ranges of capacitor start capacitor run motors is from ____________1/2 to 201/20 to 1/31/20 to 1/301/8 to 1/10HintThe horsepower ranges of capacitor start capacitor run motors are from 1/2 to 20 73). The starting current in capacitor start capacitor run motors is __________HighLowVery lowMediumHintThe starting current in capacitor start capacitor run motors is medium 3 to 5 times of full load current 74). What is the standard form of SPMSM?Surface Permanent Magnet Synchronous MotorSynchronous Permanent Magnet Synchronous MotorSynchronous Permanent Magnet Surface MotorNone of the aboveHintThe standard form of SPMSM is Surface Permanent Magnet Synchronous Motor 75). What are the advantages of the brushed DC motor?Low initial costSimple speed controlBoth a and bNone of the aboveHintThe brushed DC motors have a low initial cost, and the speed control is simple in brushed DC motorSingle-phase Induction Motor Important MCQs 76). What are the advantages of hysteresis motor?Low noiseHigh starting torqueNo vibrationAll of the aboveHintThe advantages of hysteresis motor are it has low noise, has no vibration, and has high starting torque 77). The resolution or step number is defined as a ratio of ___________________Number of steps/Number of revolutions of the rotorNumber of steps + Number of revolutions of the rotorNumber of steps*Number of revolutions of the rotorNone of the aboveHintThe resolution or step number is defined as a ratio of the number of steps divided by the number of revolutions of the rotor 78). What are the disadvantages of DC motors?Low-speed rangeLow efficiency and reliabilityBoth a and bNone of the aboveHintThe disadvantages of DC motors are it has low-speed range, low efficiency, and reliability 79). The core losses are high in ______________ motorBLDCMPMSMBoth a and bNone of the aboveHintThe core losses are high in brushless DC motors 80). What is the standard form of IPMSW?Interior Permanent Magnet Synchronous MotorInterior Permanent Magnet Surface MotorInterior Permanent Magnet Asynchronous MotorNone of the aboveHintThe standard form of IPMSW is Interior Permanent Magnet Synchronous Motor 81). What are the advantages of the brushless DC motor?Long life spanHigh-efficiencyLow maintenanceAll of the aboveHintThe advantages of the brushless DC motor are it has a long life span, high efficiency, and has low maintenance 82). The switching losses are high in ______________ motorBLDCMPMSMBoth a and bNone of the aboveHintThe switching losses are high in permanent magnet synchronous motors 83). What are the disadvantages of the permanent magnet synchronous motor?High-costHigh stator core loss at high-speedLimited speed rangeAll of the aboveHintThe disadvantages of the permanent magnet synchronous motor are it has a high cost, high stator core loss at high speed, and limited speed range 84). The brushes are present in _____________ motorSlip ringSquirrel cageBoth a and bNone of the aboveHintThe brushes are present in the slip ring motor whereas the brushes are not present in squirrel cage motors 85). In which motor the speed control is not possible?Slip ringSquirrel cageBoth a and bNone of the aboveHintThe speed control is not possible in squirrel cage motors 86). In a single-phase induction motor the stator outer diameter is around _____________10mm20mm40mm75mmHintIn a single-phase induction motor the stator outer diameter is around 75mm 87). What are the advantages of switched reluctance motors?High-efficiencyLong life spanLow-costAll of the aboveHintThe advantages of switched reluctance motor are it has high-efficiency, long life span, and has low-cost 88). In single phase induction motor the range of speed is between _____________100-200 rpm1000-2000 rpm10-20 rpm1455-1465rpmHintIn single-phase, induction motor the range of speed is between 1455-1465rpm 89). The slip ring and brushes are not present in __________ motorSlip ringSquirrel cageBoth a and bNone of the aboveHintThe slip ring and brushes are not present in the squirrel cage motor 90). The copper losses are high in _____________ motorSlip ringSquirrel cageBoth a and bNone of the aboveHintThe copper losses are high in slip ring motor 91). What is another name for slip ring motor?Phase wound rotorCage motorAsynchronousNone of the aboveHintAnother name for slip ring motor is phase wound motor 92). What is the standard form of PMSW?Permanent Magnet Synchronous MotorPermanent Magnet Surface MotorPermanent Magnet Asynchronous MotorNone of the aboveHintThe standard form of PMSW is Permanent Magnet Synchronous Motor 93). What are the advantages of the AC polyphase squirrel cage?Low-costRobust and reliableSelf-startingAll of the aboveHintThe advantages of the AC polyphase squirrel cage are it has low-cost, robust, reliable, and it is self-starting 94). In single-phase induction motors the air gap distance is around ______________10mm12mm0.25mm5mmHintIn single-phase induction motors the air gap distance is around 0.25mm 95). The frequency in single-phase induction motors is ____________10HZ30HZ40HZ50HZHintThe frequency in single-phase induction motors is 50HZ 96). In a single-phase induction motor the rotor outer diameter is around _____________10mm20mm44.5mm75mmHintIn a single-phase induction motor the rotor outer diameter is around 44.5mm 97). What are the disadvantages of switched reluctance motors?Low-efficiencyLow power densityHigh torque ripple and noiseAll of the aboveHintThe disadvantages of switched reluctance motor are it has low efficiency, low power density, and has high torque ripple and noise 98). The input voltage of single-phase induction motors is _____________100V150V230VNone of the aboveHintThe input voltage of single-phase induction motors is 230V 99). What is the standard form of FEFSM?Field Excitation Flux Switching MotorFlux Excitation Field Switching MotorField Excitation Field Switching MotorNone of the aboveHintThe standard form of FEFSM is Field Excitation Flux Switching Motor 100). In a single-phase induction motor the rated torque is around _____________0.4Nm20Nm44Nm75NmHintIn a single-phase induction motor the rated torque is around 0.4NmRead more about Single Phase Induction Motor Time is Up! Time's up
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