Electrical Drive Question & Answers October 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 Hint 2). A power modulator is classified in to how many types? 2 4 5 6 Hint 3). 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 Hint 4). An inverters type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters DC to DC converters Hint 5). 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 Hint 6). 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 Hint 7). An cycloconverter type power modulator is also called______ AC to DC converters DC to AC converters AC to AC converters Frequency conversion Hint 8). A controlled rectifiers provides ____ impedance? High Low Zero Constant Hint 9). A low power type electrical drive is fed with power from ___ phase? Single Two Three Multiple Hint 10). Other type of electrical drive apart from low power is fed with power from ___ phase? Single Two Three Multiple Hint Read 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 Hint Electrical Drive Questions and Answers 12). How much power supply is fed to medium and low type power motors? 300V 400V 500V 600V Hint 13). Which of the following is the voltage value applied to high rated power meters? 3.3kV 6.6kV 11kV All the above Hint 14). A sensing unit of electrical driver consist of how many sensing units? 3 4 5 6 Hint Read more about Torque. 15). Which of the following sensing unit is applied in a tachometer? Speed sensing Torque sensing Position sensing Current-voltage sensing Hint 16). Which of the following sensing unit is used for measuring wind speed? Tachometer Anemometer Barometer Speedometer Hint 17). Which of the following sensing unit is used for measuring speed and velocity of wind? Tachometer Anemometer Barometer Speedometer Hint 18). Which of the following control unit component is the applications of torque sensing unit? Race cars Automobiles Aircrafts All the above Hint 19). Which of the following is the function of magneto-elastic torque sensor? Speed sensing Torque sensing Position sensing Temperature sensing Hint Read more about Tachometer. 20). Which of the following are the applications of position sensing unit? GPS Vibro-meter Rotatory encoder All the above Hint 21). Which of the following is the application of temperature sensing unit? Thermistor Thermometer Tachometer Both a and b Hint 22). An electric driver is classified in to ___ types 2 3 4 5 Hint 23). 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 Hint 24). Which of the following is the characteristics of regenerative type DC drives? Four quadrant driver Controls speed Controls direction of motor All the above Hint 25). Which of the following are enhancements made in an electric drive? Slip type control algorithm Troubleshoots software’s Retarding girds All the above Hint 26). Which of the following are the dependencies of microprocessor based electric drivers? DC motor driver Traction motor driver Induction motor driver All the above Hint 27). How many phases do a microprocessor based DC motor driver use? 1 2 3 Both b and c Hint 28). 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 Hint 29). 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 Hint 30). Which of the following component of microprocessor based DC motor driver acts as a speed sensor? Techo-generator MPU Logic circuit Firing circuit Hint 31). Which of the following is the predominant feature of an electric drive? Supply power Obtain maximum output Control motion of system All the above Hint 32). Which of the following are the applications of electric drivers? Traction systems Cranes Electric cars All the above Hint 33). Which of the following are the benefits of electric drives? Easy control Minimum start delay Remote operation All the above Hint 34). Which of the following are the features provided by DC motors? Field based mechanical commutator Control of torque Direct torque measurement All the above Hint Read 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 Hint 36). Which of the following type of modulation is used for AC motors? PWM FM TWM Both a and b Hint 37). 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 Hint 38). Which of the following is the formula AC motor speed? N=60f/p N=56f/p N= 90f/p N=60p/f Hint 39). An electric motor has ___ speed of operation? Fixed Zero High Minimum Hint 40). A 4 paired poles of a motor can connect to ___ pair of poles? 4 8 6 Both a and b 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 Hint 42). What is the speed of obtained for 8pairs of poles when connected with its other pairs? 1800 RPM 900 RPM 1200 RPM 1000 RPM Hint 43). What is the frequency of operation of Ac motor? 60 Hz 50 Hz 40 Hz 10 Hz Hint 44). 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 Hint 45). Which of the following are the reasons for employing motor drivers? Energy conversion Process control Load control Both a and b Hint 46). An eddy current type driver is also called as_____ Dynamic drive Static drive Stationary drive Both b and c Hint 47). Electric motors generate ___ type of force? Linear Rotatory Tangential Both a and b Hint 48). What is the percentage of efficiency provided by electric motor? 95% 99% 100% 31% Hint 49). What is the percentage of efficiency provided by internal combustion engine? 95% 50% 100% 31% Hint 50). Who invented the electrostatic type device (electric motor)? Andrew Gordon Monk Andrew Henry Charles Danial Hint 51). Which of the following are the advantages of electric drive? Enhance efficiency Ease of control Long life span All the above Hint 52). Which of the following are the disadvantages of electric drives? High maintenance Costly Higher power consumption All the above Hint 53). 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 Hint 54). Which of the following are the load components used in an electric drive? Fan Pump Machine tools All the above Hint 55). Which of the following component of electric drive is a component that supplies sufficient power to the drive systems? Controller Load Sensor Motor Hint 56). Which of the following component of electric drive, provides the inputs to the drive systems depending on control required? Controller Load Sensor Motor Hint 57). How many types of electrical drives are there based on supply? 2 3 4 1 Hint 58). How many types of electrical drives are there based on number of motors? 2 3 4 5 Hint 59). How many types of electrical drives are there based on speed? 2 3 4 5 Hint 60). How many types of electrical drives are there based on control parameters? 1 2 3 4 Hint 61). An AC driver is also labelled as____ Variable frequency drive Variable speed drive Static speed drive Both a and b Hint 62). Which of the following are the components of VSDs drives? Rectifying unit Inductors and Capacitors Inverters All the above Hint 63). A rectifying unit in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier Hint Electrical Drive MCQ's for Interviews 64). A LC component in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier Hint 65). A inverter component in VSD performs_______ ADC DAC Smoothing of DC wave Receive and forward signals to the rectifier Hint 66). Which of the following are the advantages provided by VSD? High efficient Dynamic based response Initial current is less All the above Hint 67). Which of the following are the disadvantages of VSD? Higher drive system cost Generation of harmony Static response Both a and b Hint 68). Which of the following are the applications of VSD? Fans Compressors Crushers All the above Hint 69). A DC motor are further classified as ______ 2 3 4 1 Hint 70). Which of the following electric drive is speed control system? DC drive Analog DC drive Digital DC drive All the above Hint 71). 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 Hint 72). Which of the following motor have individual motor for various machine parts? Individual motor Multi motor Group drive motor Both a and b Hint 73). Which of the following is an example of individual type motor? Lathe machine Cranes Motors with single shaft All the above Hint 74). Which of the following is an example of multi type motor? Lathe machine Cranes Motors with single shaft All the above Hint 75). Which of the following is an example of group type motor? Lathe machine Cranes Motors with single shaft All the above Hint 76). Which of the following are the examples of constant speed drive type motor? Squirrel cage AC motor DC motor All the above Hint 77). A constant speed type drive has ___ speed drives Static Variable Constant Both a and c Hint 78). A variable speed type drive has ___ speed drives Static Variable Constant Both a and c Hint 79). Which of the following drive minimizes power consumption? Constant speed drive Variable speed drive Static speed drive Both b and c Hint Electrical Drive Important MCQ's with Hints 80). 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 Hint 81). Which of the following parameters are controlled in vector control drive? Torque Speed Direction Both a and b Hint 82). Which of the following are the applications of vector control drive? AC synchronous motor Induction motor DC synchronous Both a and b Hint 83). Which of the following are the examples of constant torque type drive? Screw compressors Feeders Conveyors All the above Hint 84). Which of the following are the application of Lathe tool? Thermal spraying Wood turning Metal spinning All the above Hint 85). Which of the following objects are generated from lathe? Gun barrels Baseball bats Crank shafts All the above Hint 86). An induction type motor is also called as____ Asynchronous motor Synchronous motor AC electric motor Both a and c Hint 87). Which of the following is the configuration of a induction motor? Squirrel cage Wound type Contactless type All the above Hint 88). Which of the following are the advantages of a 3-phase squirrel cage type induction motor? Economical Self starters Reliable All the above Hint 89). A 1-phase induction motor are used for ___ load Larger Smaller Constant Zero Hint Read more about Induction Motor 90). Which of the following is the power factor of loaded induction type motor? 0.85 0.90 0.20 Both a and b Hint 91). Which of the following is the power factor of no-loaded induction type motor? 0.85 0.90 0.20 Both a and b Hint 92). Which of the following is the reason for power factor at no-load condition? Stator leakage Rotor leakage Magnetizing reactance All the above Hint 93). What is the percentage of a windage and friction of an induction motor? 5-15percent 25-40percent 10-20percent 85-97percent Hint 94). What is the percentage of a rotor losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent Hint 95). What is the percentage of a core losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent Hint 96). What is the percentage of a stray load losses of an induction motor? 15-25percent 25-40percent 10-20percent 85-97percent Hint 97). What is the full load efficiency percentage of induction motor? 85 to 97% 99% 100% 110% Hint 98). Which of the following are the applications of linear type induction motor? Linear actuator Liquid metal pumping Magnetic levitation All the above Hint 99). Which of the following are components of induction motor? Bearings Casing Rotor All the above Hint 100). Which of the following is operation principle of induction motor? Electromotive force Electro induction Electro magnetic All the above Hint Time is Up! Time's up
