Transformer Question & Answers January 30, 2023 By Wat Electrical This article lists 100 Transformer MCQs for engineering students. All the Transformer Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Transformer. Simply, the transformer is described as a device that steps the voltages up or down. If the transformer designed is to step-up the voltages are raised and for step-down voltage, the outcome is decreased. Similarly, the current obtained at the output of step-up is decreased and for step-down, it is increased. Transformers are voltage-controlled devices. It is utilized widely in the transmission and distribution of AC power. Michael Faraday was the first person to discuss transformers in 1831. The basic ideology behind the invention of the transformer is to balance the generated electricity for higher voltages. The change in voltages supplied in transformers does not affect the frequencies. Mutual induction & Electromagnetic induction are the basic principles of the transformer. Mainly transformers are utilized for the transmission of electric energies during the transmission of power. Transformers are utilized in distinct fields like distribution section, electric, and transmission consumption of energies. Transformers are categorized depending upon various factors they are voltage working ranges, medium inside the core, arrangement of windings, and location of installation. 1). Electric energy transferred from an AC circuit to the other circuits through __________? Transformer Rectifier Resonator Filter Hint 2). What raises the voltages from the electric generators? Transformer Rectifier Resonator Filter Hint Read More about Transformer 3). What changes voltage via Electromagnetic induction? Transformer Rectifier Resonator Filter Hint 4). Transformer is a __________ device? Current Controlled Voltage Controlled Temperature Controlled Magnetic Field Controlled Hint 5). Who is the first person to discuss the idea of a transformer? William Stanley Thomas Edison Michael Faraday K.L Baird Hint 6). What is the principle involved in transformer? Mutual Induction Thumb Rule Self Induction a & b Hint 7). Copper loss in transformers is dependent on _________? Voltage Current Temperature Magnetic Flux Hint 8). Transformer loss of heat is dependent on ______? Voltage Current Phase Angle a & b Hint 9). The current flow is in one coil and the voltage induced in the second coil is __________? Mutual Induction Thumb Rule Self Induction a & b Hint 10). __________ pass AC by involving the principle of Electro-magnetic Induction? Transformer Rectifier Resonator Filter Hint 11). What tests the winding integrity in the transformer? UV Test IR Test Turns Ratio Test Resistance Testing Hint 12). What is known as the Megger test? UV Test IR Test Turns Ratio Test Resistance Testing Hint 13). Silica used to control the excess moisture in _________? Transformer Rectifier Resonator Filter Hint 14). Which test in the transformer tests the winding ratios of the primary & secondary alignment of coils? UV Test IR Test Turns Ratio Test Resistance Testing Hint 15). If the primary turns in a transformer are 100 with the secondary 10 turns. By what factor the voltage is reduced? 5 10 15 100 Hint 16). Insulation of transformer must have a greater value of resistance to pass _____________? UV Test IR Test Turns Ratio Test Resistance Testing Hint 17). What tests the insulation systems' power losses in the transformer? Power Factor Test IR Test Turns Ratio Test Resistance Testing Hint 18). What should be the current's angle to pass the Power-factor test in the transformer? 0 45 90 180 Hint 19). Malfunctioning of insulation in the transformer is detected by ___________ test? Power Factor Test IR Test Turns Ratio Test Resistance Testing Hint 20). What are the various transformers based on the phases? Single-phase Transformer Double-Phase Transformer Three-phase Transformer a & c Hint 21). Based on function,the transformers are __________? Step-up Transformer Step-down Transformer Up-down Transformer a & b Hint 22). Which testing in the transformer ensures the wired circuits are correctly connected or not? Power Factor Test IR Test Turns Ratio Test Resistance Testing Hint 23). Which test is conducted by Ohmmeter? Power Factor Test IR Test Turns Ratio Test Resistance Testing Hint 24). What are the tests performed by the manufacturer of the transformer? Type Test Routine Test IR Test a & b Hint 25). What are the various transformers classified according to usage? Power Transformer Distribution Transformer Isolation Transformer All Mentioned Above Hint Transformer MCQs for Students 26). What are the tests performed on the transformer at factories? Type Test Routine Test Special Test All Mentioned Above Hint 27). Which test on the transformer confirms the basic criteria of production? Type Test Routine Test Special Test All Mentioned Above Hint 28). Which test in the transformer confirms operational performance? Type Test Routine Test Special Test All Mentioned Above Hint 29). Before commissioning the tests performed on the transformer are _________? Type Test Routine Test Special Test Pre-commissioning Test Hint 30). What are the various transformers classified based on their core? Core-type Transformers Shell-type Transformers Berry-type Transformers All Mentioned Above Hint 31). Transformer Ratio test is ______________ of transformers? Type Test Routine Test Special Test a & b Hint 32). Which test in the transformer depends on the perfection of turns? Power Factor Test IR Test Transformer Ratio Test Resistance Testing Hint 33). Which test is conducted on the three-phase type transformers? Power Factor Test IR Test Turns Ratio Test Magnetic Balance Test Hint 34). Which test in the transformer detects the defect in the structure of magnetic cores? Power Factor Test Magnetizing Current Test Turns Ratio Test Resistance Testing Hint 35). Which test was performed before measuring DC resistances? Power Factor Test Magnetizing Current Test Turns Ratio Test Resistance Testing Hint 36). Properly grouped vectors are essential for ______________ of transformers? Series Operation Parallel Operation a & b None Hint 37). Transformer with similar vector grounds have _________? Same Phase Sequence Same Phase Divergence a &b Distinct Phase Divergence Hint 38). Dielectric tests are the type of _______ tests? Power Factor Test IR Test Transformer Ratio Test Resistance Testing Hint 39). What are the tests that check the transformer's insulation? Lightning Impulse Test Switching Impulse Test Partial Discharge Test All Mentioned Above Hint 40). Temperature rise tests in the transformer are included in _______? Type Test Routine Test Special Test Pre-commissioning Test Hint 41). Which test results are varied based on the temperature of the insulation? Power Factor Test IR Test Transformer Ratio Test Resistance Testing Hint 42). Essential type of test is ________? Power Factor Test IR Test Transformer Ratio Test Resistance Testing Hint 43). What is measured using insulation values of resistance? Indirect Current Direct Current Direct Voltage Indirect Voltage Hint 44). What is CT? Common Transformer Current Transformer Continuous Transformer Communication Transformer Hint 45). What is PT? Public Transformer Potential Transformer Pollution Transformer Pulling Transformer Hint 46). What are voltage transformers? Current Transformer Potential Transformer Public Transformer a & b Hint 47). Which transformer lowers the signals of current? Current Transformer Potential Transformer Public Transformer a & b Hint 48). What are Potential Transformers? Step-down Voltage Step-up Current Step-up Voltage a & b Hint 49). What are Current Transformers? Step-down Voltage Step-down Current Step-up Voltage b & c Hint 50). Which transformer has fewer turns in the winding i.e., primary? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint Transformer MCQs for Exams 51). Wound type transformer belongs to _________? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 52). Primary winding carries higher currents in __________? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 53). Which transformer has the conductor thin for primary windings? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 54). Which has a higher ratio of transformation? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 55). Primary winding and the power lines connected in the series format in _________? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 56). Toroidal transformer belongs to __________? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 57). How many types does a PT have? Four Three Two One Hint 58). How many cylinders does a Core-type transformer have? Four Three Two One Hint 59). Cylindrical coils placed on cylinders in __________? Core-type Transformers Shell-type Transformers Berry-type Transformers All Mentioned Above Hint 60). What does a shell-type transformer consist of? Center Cylinder Two Inner Cylinders Two Outer Cylinders a & c Hint 61). Which transformer contains Dual magnetic circuitry? Core-type Transformers Shell-type Transformers Berry-type Transformers All Mentioned Above Hint 62). Which transformer has magnetic circuitry resemblance to a Wheel? Core-type Transformers Shell-type Transformers Berry-type Transformers All Mentioned Above Hint 63). Secondary has more turns compared to primary in ___________? Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 64). What reduces the output voltages? Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 65). Secondary has fewer turns compared to primary in ___________? Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 66). Which transformer is known as a Consumption transformer? Current Transformer Potential Transformer Power Transformer Distribution Transformer Hint 67). Which transformer has 100% efficiency? Current Transformer Potential Transformer Power Transformer Continuous Transformer Hint 68). Voltage regulation is good in ____________? Current Transformer Potential Transformer Power Transformer Distribution Transformer Hint 69). The primary & secondary windings are independent in ____________? Current Transformer Potential Transformer Power Transformer Isolation Transformer Hint 70). At two points of secondary windings voltage will be _________ in the Isolation transformer? Same Distinct Constant No Change Hint 71). Instrument transformer is ___________? Current Transformer Potential Transformer Power Transformer Isolation Transformer Hint 72). What isolates the primary from secondary windings? Current Transformer Potential Transformer Power Transformer Instrument Transformer Hint 73). What is the transformer categorized based on windings? Two-winding Transformer One-winding Transformer Auto-transformer a & c Hint 74). Turns are fixed in ___________? Two-winding Transformer One-winding Transformer Auto-transformer a & c Hint 75). Primary & Secondary windings are not insulated electrically in ________? Two-winding Transformer One-winding Transformer Auto-transformer a & c Hint Transformer MCQs for Interviews 76). Which transformer does not have any liquid insulation? Two-winding Transformer Oil Type Transformer Auto-transformer Dry Type Transformer Hint 77). What are the transformers classified depending on the insulation present? Two-winding Transformer Oil Type Transformer Dry Type Transformer b & c Hint 78). Cast Resin Transformer belongs to the category of ___________? Two-winding Transformer Oil Type Transformer Auto-transformer Dry Type Transformer Hint 79). What is VPI Transformer? Vacuum Pressure Impregnated Volume Pressure Implemented Volume Physical Innovation Vacuum Polygamy Inclination Hint 80). Which transformer uses the method of oil cooling for reducing temperature? Two-winding Transformer Oil Type Transformer Auto-transformer Dry Type Transformer Hint 81). Immersed natural and forced cooling air transformers to belong to ___________? Two-winding Transformer Oil Type Transformer Auto-transformer Dry Type Transformer Hint 82). Single-phase transformers are generally used as _________? Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 83). How many sets of winding are present in Three-phase transformers? Four Three Two One Hint 84). Why the transformer has laminated iron cores? To Reduce Voltage To Reduce Temperature To Reduce Efficiency To Reduce Eddy Currents Hint 85). Which transformers are capable of transferring Radio-frequency currents? Air Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 86). What matches the impedance of the source with the load? Core-type Transformers Step-up Transformer Step-down Transformers Impedance Matching Transformer Hint 87). What is used as Voltage Regulators? Transformer Rectifier Resonator Filter Hint 88). What transforms high currents? Current Transformer Potential Transformer Power Transformer Isolation Transformer Hint 89). Electricity is measured using ___________? Current Transformer Potential Transformer Power Transformer Isolation Transformer Hint 90). Electric leakage risk is reduced in ______________? Current Transformer Potential Transformer Power Transformer Isolation Transformer Hint 91). Which transformers are used for the home appliance? Current Transformer Potential Transformer Power Transformer Distribution Transformer Hint 92). Which transformer is known as a higher-capacity transformer? Current Transformer Potential Transformer Power Transformer Continuous Transformer Hint 93). Higher voltages of transmission network use __________? Current Transformer Potential Transformer Power Transformer Continuous Transformer Hint 94). Generating station use ____________? Core-type Transformers Step-up Transformer Step-down Transformers Berry-type Transformer Hint 95). What is the secondary rating of the wiring of CT? 1 A 2 A 5 A a or c Hint 96). ___________ is independent of burden? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 97). What measures voltages in electric lines of power? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 98). Relays & contactors are operated using _________? Current Transformer Potential Transformer Public Transformer Continuous Transformer Hint 99). Why test a transformer? Check Functioning Decrease Failure Chances Increase Failure Rate a & b Hint 100). To transmit the power for a longer distance _________ is used? Transformer Rectifier Resonator Filter Hint For More MCQs Single Phase Transformer Question & Answers Time's up
