Electrical Inductors Question & Answers September 2, 2021 By Wat Electrical Leave a Comment This article lists 100 Electrical Inductors MCQs for engineering students. All the Electrical Inductors Questions & Answers given below includes solution and link wherever possible to the relevant topic. An inductor is a device that temporarily stores energy in the form of a magnetic field. The purpose of an inductor is to oppose any change in the magnitude of the current within a circuit. The inductance is the property of an inductor that opposes the change in current, if we take a wire or conductor and twisted it in a spiral manner then it is called an inductor. 1). In which field do inductors stores energy? Magnetic Electrical Both a and b None of the above None Hint 2). What is the unit of inductance? Mole Ohms Henry None of the above None Hint 3). The inductors are used in _________ Motors High power applications Transformers All of the above None Hint 4). The power dissipated in an inductor is due to ______________ Inductor core Windings Both a and b None of the above None Hint 5). In an inductor core, the energy loss is due to ____________ Eddy current losses Hysteresis Both a and b None of the above None Hint 6). In an inductors the losses occurs in ____________ Windings Core Both a and b None of the above None Hint 7). The coil in _____________ inductors is wounded on the bobbin Toroidal core Bobbin based Ferrite core None of the above None Hint 8). The air core inductors have ____________ coils Small Very small Larger Doesn’t have coils None Hint 9). The coil in ____________ inductors is wounds on a toroid circular former Toroidal core Bobbin based Ferrite core None of the above None Hint 10). The bobbin based inductors mostly used in ______________ Power conversion applications Switch mode power supplies Both a and b None of the above None Hint 11). The multilayer inductors mainly used in ______________ Noise suppression applications Mobile communication systems Both a and b None of the above None Hint 12). The flux leakage in toroidal core inductors is _______________ High Very high Low Very low None Hint 13). In ____________inductors the core is absent completely Toroidal core Bobbin based Ferrite core Air core None Hint 14). The inductors are categorized into ___________ One Two Three Four None Hint 15). The slug tuned inductors are ____________ inductors Fixed Variable Both a and b None of the above None Hint 16). Which type of inductor is used for tuning circuits like radio? Toroidal core Variable core Ferrite core Air core None Hint 17). The tapped inductors are ______________ type of inductors Fixed Variable Both a and b None of the above None Hint 18). _____________ resists changes in current Inductor Capacitor Resistor None of the above None Hint 19). In an inductor the current lags voltage by _____________ 1/2 1/4 π/2 None of the above None Hint 20). An inductor is denoted by a letter _____________ L R C None of the above None Hint 21). In an inductor the amount of inductance depends on _____________ Size, shape, and material of the core Number of turns of wire in an inductor Both a and b None of the above None Hint 22). _____________ resists changes in voltage Inductor Capacitor Resistor None of the above None Hint 23). The iron core inductors are ___________ type of inductors Fixed Variable Both a and b None of the above None Hint 24). The iron core coil inductance will decrease when _____________ is decreased Number of turns Length of the coil Both a and b None of the above None Hint 25). The energy stored in an electromagnetic field decreases when ____________ decrease Number of turns Length of the coil Current through an inductor None of the above None Hint Electrical Inductors Important MCQs with Hints 26). ____________ inductor don’t saturate Air core Iron core Ferrite core None of the above None Hint 27). The ferrite core inductors are _____________ type of inductors Fixed Variable Both a and b None of the above None Hint 28). Which one of the following inductors have a low stray magnetic field? Air core Iron core Ferrite core None of the above None Hint 29).The vendor comparison is more difficult in __________ inductor Air core Iron core Ferrite core None of the above None Hint 30). Which one of the following inductors has a low number of turns in the winding? Air core Iron core Ferrite core None of the above None Hint 31). __________ are the type of inductor cores Iron, air cores Ferrite, toroidal cores Laminated cores All of the above None Hint 32). The ferrite core inductors used in __________ Power transformers Switching circuits Pi filters All of the above None Hint 33). What is the value of one henry in terms of micro-henries? 1000000µH 10000µH 1000µH 0.001µH None Hint 34). The ferrites are categorized into ____________ One Two Three Four None Hint 35). What is the symbol of metal magnesium? Mn Mg Mg or Mn None of the above None Hint 36). The molded inductors molded by ____________ Copper Ceramic insulators Plastic Ceramic insulators or plastic None Hint 37). What are the advantages of planar inductors? Low leakage inductance High power density Both a and b None of the above None Hint 38). ____________ choke is used to bock the audio frequency AF RF Both a and b None of the above None Hint 39). What is the symbol of metal nickel? N Nk Ni None of the above None Hint 40). ____________ choke is used to bock the audio frequency AF RF Both a and b None of the above None Hint 41). The thin film inductor used in _______________ Power supplies Wireless networks Mobile communication devices All of the above None Hint 42). An inductor is also called as _____________ Reactor Choke Coil All of the above None Hint 43). How many terminals does an inductor have? One Two Three Four None Hint 44). The inductance is the property of ___________ Inductor Capacitor Resistor All of the above None Hint 45). The self-inductance of a coil depends on _______________ Number of turns Shape and size of the coil Both a and b None of the above None Hint 46). What is the symbol of metal manganese? Mn Mg Mg or Mn None of the above None Hint 47). What is the value of one millihenry in terms of microhenries? 1000000µH 10000µH 1000µH 0.001µH None Hint 48). ____________ choke is used to bock the radio frequency AF RF Both a and b None of the above None Hint 49). ____________ inductance is also called a back E.M.F Self-induced Mutual-induced Both a and b None of the above None Hint 50). Which one of the following contains less number of turns in a step-up transformer? Thick wire Primary coil Secondary coil None of the above None Hint Electrical Inductors for Interviews 51). In which one of the following transformers the thin wire is used to wind the primary coil? Step up Step down Both a and b None of the above None Hint 52). In which one of the following transformers the thick wire is used to wind the primary coil? Step up Step down Both a and b None of the above None Hint 53). In _____________ transformer the secondary coil contains less number of turns Step-up Step-down Both a and b None of the above None Hint 54). The magnetic flux is positive for ____________ 0≤θ≤90 degrees 270≤θ≤360 degrees Both a and b None of the above None Hint 55). ___________ is defined as a ratio of total magnetic flux linkage by the current through coil Self-induction Mutual-induction Both a and b None of the above None Hint 56). The self-inductance doesn’t depend on _____________ Shape of the coil Number of turns Current All of the above None Hint Read more about Self Inductance 57). What is the symbol of metal cobalt? Cu Co Cob None of the above None Hint 58). The magnetic flux is zero for θ = ____________ 90 degrees 120 degrees 360 degrees 90 and 270 degrees None Hint 59). The magnetic flux is negative for ____________ 90<θ<270 degrees 270≤θ≤360 degrees Both a and b None of the above None Hint 60). What is the value of one nano henry in terms of micro-henries? 1000000µH 10000µH 1000µH 0.001µH None Hint 61). What is the unit of magnetic flux? Weber Henry Ohms None of the above None Hint 62). What is the cgs unit of magnetic flux? Weber Henry Ohms Maxwell None Hint 63). Which one of the following is an induced emf expression? E=-dф/dt I=-dф/R dq=-dф/R None of the above None Hint 64). The induced emf of a generator can be increase by _____________ Using stronger magnets Increasing rotational speed of the coil Both a and b None of the above None Hint 65). The electromagnetic induction is used in _____________ Electric guitars Electrical generators Moving coil microphones All of the above None Hint 66). The size of an induced voltage increases when the _____________ Area of the coil is greater Speed of the movement increases Both a and b None of the above None Hint 67). The ratio of magnetic flux divided by an area is known as ____________ Magnetic flux Magnetic flux density Induced EMF None of the above None Hint 68). What is the symbol of metal chromium? Cu Co Cr None of the above None Hint 69). Which one of the following is measured in tesla? Magnetic flux Magnetic flux density Induced EMF None of the above None Hint 70). In a magnetic field, the force on a current conductor is given by _____________ F=BIL F=Bqv ф=BA None of the above None Hint 71). In a magnetic field, the force on a single moving charge is given by _____________ F=BIL F=Bqv ф=BA None of the above None Hint 72).The direction of an induced current depends on the direction of ___________ Magnetic field Magnets motion Both a and b None of the above None Hint 73). The magnitude of an induced current depends on ______________ Strength of the magnetic field Number of turns of the coil Speed of the motion All of the above None Hint 74).An induction is discovered by Michael Faraday in __________ 1990 1999 2000 1831 None Hint 75). What is the standard form of E.M.F? Electro-Mechanical Force Electromotive Force Electromagnetic Force None of the above None Hint Electrical Inductors Exam Questions and Answers 76). The tolerance is categorized into _____________ One Two Three Four None Hint 77). The average induced voltage for an inductor is defined by ___________ Ldi/dt Rdi/dt di/dt None of the above None Hint 78). The magnetomotive force measured in ____________ Ampere-turns Volt ampere Volt ampere reactive None of the above None Hint 79). ______________ is the unit of true power Ampere-turns Volt-ampere Volt-ampere reactive None of the above None Hint 80). What is the symbol of metal zinc? Zn Z Zi None of the above None Hint 81). ______________ is the unit of reactive power Ampere-turns Volt ampere Volt ampere reactive None of the above None Hint 82). The quality factor of a coil is defined as a ratio of ______________ True power by reactive power Reactive power by true power True power*reactive power None of the above None Hint 83). What is the S.I unit of resistance? Ampere-turns Volt ampere Volt ampere reactive Ohms None Hint 84). What is the S.I unit of resistivity? Ampere-turns Volt ampere Volt ampere reactive Ohm-meter None Hint 85). The inductor impedance is given by ____________ jꙍL jꙍ jL None of the above None Hint 86). Which one of the following is the correct formula for the time constant? t=L/R b) c) d) t=RL t=R/L None of the above None Hint 87).The inductance value expressed in ____________ Millihenries Henries Microhenries All of the above None Hint 88). What is the standard form of M.M.F? Magnetic Mechanical Force Mechanical motive Force Magneto Motive Force None of the above None Hint 89). The magnitude of the field defined by a ______________ Magnetomotive force Magnetic field strength Both a and b None of the above None Hint 90). For a coil of N turns the magnetomotive force is given by _____________ F=IN F=Bqv ф=BA None of the above None Hint 91). For a coil of N turns the field strength is given by _____________ H=IN/L F=Bqv ф=BA None of the above None Hint 92). Which one of the following dissipates energy? Resistor Capacitor Inductor None of the above None Hint 93). What is the symbol of power? P R W None of the above None Hint 94). What is the unit of energy? Joule Watt Ohms None of the above None Hint 95). In an inductor motor crawling is caused by ___________ Low and high voltage Harmonics Both a and b None of the above None Hint Read more about Inductors 96). The squirrel cage induction motor power factor is low at ___________ High loads Low loads No load Low voltage None Hint 97). The squirrel cage rotor resistance is ____________ Small Very small Large Very large None Hint 98). In an induction motors the DC excitation is ___________ Required Not required Should be high Should be low None Hint 99). In motors the crawling is solved by _____________ Skewing Low voltage High voltage None of the above None Hint 100). What is the symbol of energy? P R W None of the above None Hint Time's up
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