Electrical Drive Question & AnswersOctober 4, 2021 By Wat Electrical This article lists 100 Electrical Drive MCQs for engineering students. All the Electrical Drive Questions & Answers given below includes solution and link wherever possible to the relevant topic.An electrical or electric drive is a system that revolves around the concept of controlling the electrical-based input to mechanical-based power output. This drive comprises sophisticated type electronic systems for controlling the motion of the system. The block diagram of an electrical drive comprises sources like current or voltage, power converters like ADC or DAC, motors like static and dynamic, load like constant or dynamic, sensors like speed, and a controller unit. Where each of them has its individual functionality. An electrical driver application may vary depending on the zones used. They are mainly used in heavy industrial application areas where a huge load is added along with heavy motors like pumps, paper machines, robots, etc. These drives are also used in smaller loaded areas such as fans, rotors, vehicles, etc. These drives provide higher efficiency up to 98%, are highly reliable, have high speed, high power, perform repetitive tasks, etc. But they limit in terms of breakdowns, occupies larger space, noise, etc.1). How many components do an electric drive consist of ___ ? 6 3 4 5 None Hint2). A power modulator is classified in to how many types? 2 4 5 6 None Hint3). A controlled rectifier type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters DC to DC converters None Hint4). An inverters type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters DC to DC converters None Hint5). An AC voltage controller type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters DC to DC converters None Hint6). An DC chopper type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters DC to DC converters None Hint7). An cycloconverter type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters Frequency conversion None Hint8). A controlled rectifiers provides ____ impedance? High Low Zero Constant None Hint9). A low power type electrical drive is fed with power from ___ phase? Single Two Three Multiple None Hint10). Other type of electrical drive apart from low power is fed with power from ___ phase? Single Two Three Multiple None HintRead more about rectifiers.11). Which of the following component of power modulator is used for matching power type converter and motor for meeting load requirement? Inverter Controller rectifier DC chopper Cyclo converter None HintElectrical Drive Questions and Answers 12). How much power supply is fed to medium and low type power motors? 300V 400V 500V 600V None Hint13). Which of the following is the voltage value applied to high rated power meters? 3.3kV 6.6kV 11kV All the above None Hint14). A sensing unit of electrical driver consist of how many sensing units? 3 4 5 6 None HintRead more about Torque.15). Which of the following sensing unit is applied in a tachometer? Speed sensing Torque sensing Position sensing Current-voltage sensing None Hint16). Which of the following sensing unit is used for measuring wind speed? Tachometer Anemometer Barometer Speedometer None Hint17). Which of the following sensing unit is used for measuring speed and velocity of wind? Tachometer Anemometer Barometer Speedometer None Hint18). Which of the following control unit component is the applications of torque sensing unit? Race cars Automobiles Aircrafts All the above None Hint19). Which of the following is the function of magneto-elastic torque sensor? Speed sensing Torque sensing Position sensing Temperature sensing None HintRead more about Tachometer.20). Which of the following are the applications of position sensing unit? GPS Vibro-meter Rotatory encoder All the above None Hint21). Which of the following is the application of temperature sensing unit? Thermistor Thermometer Tachometer Both a and b None Hint22). An electric driver is classified in to ___ types 2 3 4 5 None Hint23). Which of the following is the characteristics of non-regenerative type DC drives? Controls motors speed Controls torque in uni-direction Controls direction of motor Both a and b None Hint24). Which of the following is the characteristics of regenerative type DC drives? Four quadrant driver Controls speed Controls direction of motor All the above None Hint25). Which of the following are enhancements made in an electric drive? Slip type control algorithm Troubleshoots software’s Retarding girds All the above None Hint26). Which of the following are the dependencies of microprocessor based electric drivers? DC motor driver Traction motor driver Induction motor driver All the above None Hint27). How many phases do a microprocessor based DC motor driver use? 1 2 3 Both b and c None Hint28). Which of the following phase is supplied to microprocessor based DC motor driver? AC to AC-DC converter AC to DC-DC converter DC to AC-DC converter DC to DC-DC converter None Hint29). Which of the following type of supply current is given as input to microprocessor based DC motor driver? AC DC 0V Both a and b None Hint30). Which of the following component of microprocessor based DC motor driver acts as a speed sensor? Techo-generator MPU Logic circuit Firing circuit None Hint31). Which of the following is the predominant feature of an electric drive? Supply power Obtain maximum output Control motion of system All the above None Hint32). Which of the following are the applications of electric drivers? Traction systems Cranes Electric cars All the above None Hint33). Which of the following are the benefits of electric drives? Easy control Minimum start delay Remote operation All the above None Hint34). Which of the following are the features provided by DC motors? Field based mechanical commutator Control of torque Direct torque measurement All the above None HintRead more about rectifiers.35). Which of the following components in AC motor drive control the speed of motor? Rectifier unit DC circuit Inverter All the above None Hint36). Which of the following type of modulation is used for AC motors? PWM FM TWM Both a and b None Hint37). On which of the following factors do AC motors depends on? Frequency of incoming AC type power No of poles Time period Both a and b None Hint38). Which of the following is the formula AC motor speed? N=60f/p N=56f/p N= 90f/p N=60p/f None Hint39). An electric motor has ___ speed of operation? Fixed Zero High Minimum None Hint40). A 4 paired poles of a motor can connect to ___ pair of poles? 4 8 6 Both a and b None 41). What is the speed of obtained for 4pairs of poles when connected with its other pairs? 1800 RPM 900 RPM 1200 RPM 1000 RPM None Hint42). What is the speed of obtained for 8pairs of poles when connected with its other pairs? 1800 RPM 900 RPM 1200 RPM 1000 RPM None Hint43). What is the frequency of operation of Ac motor? 60 Hz 50 Hz 40 Hz 10 Hz None Hint44). Which of the following method is used for changing speed of AC motor? Adjusting shunt current field Changing armature current Increasing poles pairs All the above None Hint45). Which of the following are the reasons for employing motor drivers? Energy conversion Process control Load control Both a and b None Hint46). An eddy current type driver is also called as_____ Dynamic drive Static drive Stationary drive Both b and c None Hint47). Electric motors generate ___ type of force? Linear Rotatory Tangential Both a and b None Hint48). What is the percentage of efficiency provided by electric motor? 95% 99% 100% 31% None Hint49). What is the percentage of efficiency provided by internal combustion engine? 95% 50% 100% 31% None Hint50). Who invented the electrostatic type device (electric motor)? Andrew Gordon Monk Andrew Henry Charles Danial None Hint51). Which of the following are the advantages of electric drive? Enhance efficiency Ease of control Long life span All the above None Hint52). Which of the following are the disadvantages of electric drives? High maintenance Costly Higher power consumption All the above None Hint53). Which of the following motors are commonly used in an electric drive? Brush less type DC motor Stepper type motor DC motor All the above None Hint54). Which of the following are the load components used in an electric drive? Fan Pump Machine tools All the above None Hint55). Which of the following component of electric drive is a component that supplies sufficient power to the drive systems? Controller Load Sensor Motor None Hint56). Which of the following component of electric drive, provides the inputs to the drive systems depending on control required? Controller Load Sensor Motor None Hint57). How many types of electrical drives are there based on supply? 2 3 4 1 None Hint58). How many types of electrical drives are there based on number of motors? 2 3 4 5 None Hint59). How many types of electrical drives are there based on speed? 2 3 4 5 None Hint60). How many types of electrical drives are there based on control parameters? 1 2 3 4 None Hint61). An AC driver is also labelled as____ Variable frequency drive Variable speed drive Static speed drive Both a and b None Hint62). Which of the following are the components of VSDs drives? Rectifying unit Inductors and Capacitors Inverters All the above None Hint63). A rectifying unit in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier None HintElectrical Drive MCQ's for Interviews64). A LC component in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier None Hint65). A inverter component in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier None Hint66). Which of the following are the advantages provided by VSD? High efficient Dynamic based response Initial current is less All the above None Hint67). Which of the following are the disadvantages of VSD? Higher drive system cost Generation of harmony Static response Both a and b None Hint68). Which of the following are the applications of VSD? Fans Compressors Crushers All the above None Hint69). A DC motor are further classified as ______ 2 3 4 1 None Hint70). Which of the following electric drive is speed control system? DC drive Analog DC drive Digital DC drive All the above None Hint71). Which of the following electric drive is used for controlling the speed of motor? AC drive Variable frequency drive Variable speed drive All the above None Hint72). Which of the following motor have individual motor for various machine parts? Individual motor Multi motor Group drive motor Both a and b None Hint73). Which of the following is an example of individual type motor? Lathe machine Cranes Motors with single shaft All the above None Hint74). Which of the following is an example of multi type motor? Lathe machine Cranes Motors with single shaft All the above None Hint75). Which of the following is an example of group type motor? Lathe machine Cranes Motors with single shaft All the above None Hint76). Which of the following are the examples of constant speed drive type motor? Squirrel cage AC motor DC motor All the above None Hint77). A constant speed type drive has ___ speed drives Static Variable Constant Both a and c None Hint78). A variable speed type drive has ___ speed drives Static Variable Constant Both a and c None Hint79). Which of the following drive minimizes power consumption? Constant speed drive Variable speed drive Static speed drive Both b and c None HintElectrical Drive Important MCQ's with Hints80). Which of the following type of control motor provides accurate output compared to voltage frequency drive? Vector CD Constant PD Constant Torque drive All the above None Hint81). Which of the following parameters are controlled in vector control drive? Torque Speed Direction Both a and b None Hint82). Which of the following are the applications of vector control drive? AC synchronous motor Induction motor DC synchronous Both a and b None Hint83). Which of the following are the examples of constant torque type drive? Screw compressors Feeders Conveyors All the above None Hint84). Which of the following are the application of Lathe tool? Thermal spraying Wood turning Metal spinning All the above None Hint85). Which of the following objects are generated from lathe? Gun barrels Baseball bats Crank shafts All the above None Hint86). An induction type motor is also called as____ Asynchronous motor Synchronous motor AC electric motor Both a and c None Hint87). Which of the following is the configuration of a induction motor? Squirrel cage Wound type Contactless type All the above None Hint88). Which of the following are the advantages of a 3-phase squirrel cage type induction motor? Economical Self starters Reliable All the above None Hint89). A 1-phase induction motor are used for ___ load Larger Smaller Constant Zero None HintRead more about Induction Motor90). Which of the following is the power factor of loaded induction type motor? 0.85 0.90 0.20 Both a and b None Hint91). Which of the following is the power factor of no-loaded induction type motor? 0.85 0.90 0.20 Both a and b None Hint92). Which of the following is the reason for power factor at no-load condition? Stator leakage Rotor leakage Magnetizing reactance All the above None Hint93). What is the percentage of a windage and friction of an induction motor? 5-15percent 25-40percent 10-20percent 85-97percent None Hint94). What is the percentage of a rotor losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent None Hint95). What is the percentage of a core losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent None Hint96). What is the percentage of a stray load losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent None Hint97). What is the full load efficiency percentage of induction motor? 85 to 97% 99% 100% 110% None Hint98). Which of the following are the applications of linear type induction motor? Linear actuator Liquid metal pumping Magnetic levitation All the above None Hint99). Which of the following are components of induction motor? Bearings Casing Rotor All the above None Hint100). Which of the following is operation principle of induction motor? Electromotive force Electro induction Electro magnetic All the above None Hint Time's up
