Single Phase Transformer Question & Answers January 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 Hint 2). A single phase transformer has ____ voltage levels? Lower Higher Constant Both a and b Hint 3). Which of the following are the components of a single phase transformer? Magnetic iron core Copper windings Load All the above Hint 4). What basis does a single phase transformer operate on? Faradays law Ohms law Columbus law Charles law Hint 5). How many windings does a single phase transformer has on its primary and secondary? 1,1 1,2 2,1 2,2 Hint 6). Which of the following type of supply is provided to a transformer? AC DC ADC Both a and b Hint 7). Single phase transformer is what kind of equipment? Active Passive Ideal Both a and b Hint 8). Which of the following parameters are adjusted on adjusting the current and voltage of a transformer? Voltage Current Resistance Both a and b Hint 9). How many wires are required for a single phase transformer to complete its circuit? 2 3 4 5 Hint 10). 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 Hint 11). What Is efficiency of a Single Phase Transformer? 95 to 99% 98% 90% 100% Hint 12). Which of the following force does a faradays law of electromagnetism predicts? Electromotive force Electro magnetic force Electric Magnetic Hint 13). Which of the following are the parts of single phase transformer? Electric Magnetic Dielectric Both a and b Hint 14). what constitutes a single-phase transform's key components? Core Windings Wires Both a and b Hint 15). To build a single phase transformer ____ is used as a medium between the core and windings? Insulation Conduction Themocouple All the above Hint 16). 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 Hint 17). 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 Hint 18). What are the applications of single phase transformers? Power generation Audio systems Electronic equipment All the above Hint 19). Which of the following is absent in a single phase transformer? Mechanical friction Electric moment Magnetic moment Both a and b Hint 20). 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 Hint Single Phase Transformer MCQs for Students 21). ____ is generated when initial winding of a transformer come across AC current? AC electromagnetic field AC magnetic field AC electric field DC current Hint 22). Which of the following substance is used for lamination on a single phase transformer? Silicon Steel Platinum Copper Iron Hint 23). 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 Hint 24). 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 Hint 25). Which of the following are the types of single phase type transformer? Core based Shell base Star Both a and b Hint Read more about Core transformer 26). Which of the following transformer type of single phase transformer has 2 vertical limbs? Core based Shell base Star Both a and b Hint 27). The windings in a core based transformer is of which form? Cylindrical Rectangle Triangle Circle Hint 28). Which of the following are the advantages of single-phase type transformer? Reliability Minimizes overloading Operates on load demands All the above Hint 29). Which of the following type of transformer is connected to a home? 1-phase 3-phase 2-phase 4-phase Hint 30). Which of the following parameter is converted in transformer? Current Voltage Resistance All the above Hint Single Phase Transformer MCQs for Interviews 31). The value of emf in a transformer is____ when DC is applied? 0 Constant Infinite 1 Hint 32). 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 Hint 33). Which of the following are the units of frequency? Hertz Meters Centimeters Hint 34). 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 Hint 35). Which of the following is the purpose of oil in a transformer? Cooling Insulation Isolation Both a and b Hint 36). Which of the following are the characteristics of a single phase transformer? Step down transformer Low voltage type applications Rectifying All the above Hint 37). Increase in magnetic flux of a transformer increases ____ parameter? Voltage Current Resistance Both a and c Hint 38). Which of the following is the disadvantage of core based transformer? Maximum flux leakage Maximum resistance High voltage Both a and c Hint 39). A shell based transformer has _____ number if closed magnetic paths? 1 2 3 4 Hint 40). Which of the following are the advantages of shell based transformer? Minimum core type losses Minimum flux leakage Greater efficiency All the above Hint 41). Which of the following are the Maxwells equations? Gauss law for electricity Gauss law for magnetism Faradays law of induction All the above Hint 42). 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 Hint 43). Which of the following is type of transformer transduces radio based frequency current? Air core type Shell type Shade type All the above Hint 44). The permeability of a transformers core is? High Low Zero Minimum Hint 45). Which of the following is the purpose of core in a transformer? Winding support Minimum reluctance path provision High resistance Both a and b Hint 46). 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 Hint 47). Which of the following in a transformer is responsible for preventing the atmospheric moisture entry in to transformer? Tank Breather Core Insulator Hint 48). Which of the following are examples of passive type devices? Transformer Resistors Inductors All the above Hint 49). Which of the following are active devices? Current sources Voltage sources Transistors All the above Hint 50). Which of the following is unit of magnetic flux? Weber Farads Meters Henry Hint Time's up