Single Phase Transformer Question & AnswersJanuary 16, 2023 By Wat Electrical This article lists 50 Single Phase Transformer MCQs for engineering students. All the Single Phase 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 Single Phase Transformer.An electrical device that transduces input AC current from one circuit to another circuit is a transformer. It operates on the principle of faradays law type mutual based induction. This principle is a class of Maxwell equations. They are classified as single-phase and three-phase transformers. A single-phase type transformer is built with a core, shell, windings, load, and AC supply. It has 2 main parts electric and magnetic for controlling the VI flow. The characteristics of a single-phase transformer include a step-down transformer, low voltage type applications, and rectifying.Core-based and shell based are single-phase type transformers. Where a shell-based transformer overcomes the disadvantage of a core-type transformer ( such as high leakage in flux due to magnetic lines flowing outside the core) and has 2 numbers if closed magnetic path with minimum core type losses, minimum flux leakage, and greater efficiency.The advantages of a single-phase type transformer include reliability, minimizes overloading, and operates on load demands. The applications of single phase transformers are frequently used in power generation, audio systems, and electronic equipment. 1). A lower voltage level in a single phase transformer is called? Step down Step up Step up - down All the above None Hint2). A single phase transformer has ____ voltage levels? Lower Higher Constant Both a and b None Hint3). Which of the following are the components of a single phase transformer? Magnetic iron core Copper windings Load All the above None Hint4). What basis does a single phase transformer operate on? Faradays law Ohms law Columbus law Charles law None Hint5). How many windings does a single phase transformer has on its primary and secondary? 1,1 1,2 2,1 2,2 None Hint6). Which of the following type of supply is provided to a transformer? AC DC ADC Both a and b None Hint7). Single phase transformer is what kind of equipment? Active Passive Ideal Both a and b None Hint8). Which of the following parameters are adjusted on adjusting the current and voltage of a transformer? Voltage Current Resistance Both a and b None Hint9). How many wires are required for a single phase transformer to complete its circuit? 2 3 4 5 None Hint10). How much will the secondary coil's current be lowered if the transformer raises the voltage to n times its initial value? 1/2 1/4 1/8 1/n None Hint11). What Is efficiency of a Single Phase Transformer? 95 to 99% 98% 90% 100% None Hint12). Which of the following force does a faradays law of electromagnetism predicts? Electromotive force Electro magnetic force Electric Magnetic None Hint13). Which of the following are the parts of single phase transformer? Electric Magnetic Dielectric Both a and b None Hint14). what constitutes a single-phase transform's key components? Core Windings Wires Both a and b None Hint15). To build a single phase transformer ____ is used as a medium between the core and windings? Insulation Conduction Themocouple All the above None Hint16). Why silicon steel is used as one of the materials in a transformer's core? Minimize Hysteresis loss Minimize eddy current loss Maximize eddy current Maximize hysteresis None Hint17). When silicon is injected to transformer core in amounts of 4 to 5% the ____ factor is increased for a substance? Resistivity Eddy current Capacitive Inductive None Hint18). What are the applications of single phase transformers? Power generation Audio systems Electronic equipment All the above None Hint19). Which of the following is absent in a single phase transformer? Mechanical friction Electric moment Magnetic moment Both a and b None Hint20). What is the source of humming sounds in single-phase and three-phase transformers? Improper core staggering Proper core staggering Conflict in windings Number of turns None HintSingle Phase Transformer MCQs for Students21). ____ is generated when initial winding of a transformer come across AC current? AC electromagnetic field AC magnetic field AC electric field DC current None Hint22). Which of the following substance is used for lamination on a single phase transformer? Silicon Steel Platinum Copper Iron None Hint23). On which of the following core, the windings in a single phase transformer are placed? Magnetic core Electric core Both a and b On load None Hint24). Which of the following component in a single phase transformer is responsible for minimizing the eddy current losses? Lamination Magnetic core Silicon steel Electric core None Hint25). Which of the following are the types of single phase type transformer? Core based Shell base Star Both a and b None HintRead more about Core transformer26). Which of the following transformer type of single phase transformer has 2 vertical limbs? Core based Shell base Star Both a and b None Hint27). The windings in a core based transformer is of which form? Cylindrical Rectangle Triangle Circle None Hint28). Which of the following are the advantages of single-phase type transformer? Reliability Minimizes overloading Operates on load demands All the above None Hint29). Which of the following type of transformer is connected to a home? 1-phase 3-phase 2-phase 4-phase None Hint30). Which of the following parameter is converted in transformer? Current Voltage Resistance All the above None HintSingle Phase Transformer MCQs for Interviews31). The value of emf in a transformer is____ when DC is applied? 0 Constant Infinite 1 None Hint32). Which of the following is the flux value of transformer? Ep= 4.44Np f Pi m Ep= 5.44Np f Pi m Ep= 7 Np f Pi m Ep= 8.44Np f Pi m None Hint33). Which of the following are the units of frequency? Hertz Meters Centimeters None Hint34). Which of the following is the thickness of single phase transformers lamination for minimizing the losses? 0.25 to 0.5nm 0.5nm 0.6nm 0.8nm None Hint35). Which of the following is the purpose of oil in a transformer? Cooling Insulation Isolation Both a and b None Hint36). Which of the following are the characteristics of a single phase transformer? Step down transformer Low voltage type applications Rectifying All the above None Hint37). Increase in magnetic flux of a transformer increases ____ parameter? Voltage Current Resistance Both a and c None Hint38). Which of the following is the disadvantage of core based transformer? Maximum flux leakage Maximum resistance High voltage Both a and c None Hint39). A shell based transformer has _____ number if closed magnetic paths? 1 2 3 4 None Hint40). Which of the following are the advantages of shell based transformer? Minimum core type losses Minimum flux leakage Greater efficiency All the above None Hint41). Which of the following are the Maxwells equations? Gauss law for electricity Gauss law for magnetism Faradays law of induction All the above None Hint42). Which of the following is other name of core type transformer? Single window type transformer Double window type transformer Uni window transformer All the above None Hint43). Which of the following is type of transformer transduces radio based frequency current? Air core type Shell type Shade type All the above None Hint44). The permeability of a transformers core is? High Low Zero Minimum None Hint45). Which of the following is the purpose of core in a transformer? Winding support Minimum reluctance path provision High resistance Both a and b None Hint46). If v1, v2 are 2 voltages of a transformer, then V2>V1 then the transformer is? Step-up Step-down Ideal Both a and c None Hint47). Which of the following in a transformer is responsible for preventing the atmospheric moisture entry in to transformer? Tank Breather Core Insulator None Hint48). Which of the following are examples of passive type devices? Transformer Resistors Inductors All the above None Hint49). Which of the following are active devices? Current sources Voltage sources Transistors All the above None Hint50). Which of the following is unit of magnetic flux? Weber Farads Meters Henry None Hint Time's up
