101 Basic Series - Module 04 - Post Assessment Your final score on this exam will be emailed to you for your records. First name:   Last name:   Company name:   E-Mail Address   City   State   NO STATEALAKASAZARCACOCTDEDCFMFLGAGUHIIDILINIAKSKYLAMEMHMDMAMIMNMSMOMTNENVNHNJNMNYNCNDMPOHOKORPAPRPWRISCSDTNTXUTVTVIVAWAWVWIWY Province (Optional)   Country (Optional)   1 The amount of coupling that takes place between the two windings in a transformer is the ________. Coefficient of coupling Coefficient of coupling Eddy Current Copper loss Basic impulse level Expansion/contraction of the laminations 2 The lower the heat loss in a transformer, the lower the efficiency. True False 3 Fine tuning the input voltage to get the desired output is called ________, which allows for consistency in output voltage. Normal taps Power taps Voltage taps Current taps 4 If each secondary of a single phase transformer is rated 120V and 100A, when connected in series, they would equal 240V, 100A or 24KVA. True False 5 The transformer ________ is used to provide a controlled path for the magnetic flux generated in the transformer by current flowing through the windings. Input connections Output connections Windings (or coils) Core 6 When a transformer transfers electrical energy from one circuit to another, it changes the frequency. True False 7 The most common rating for transformers is in ________. Gigavoltamperes Megavoltamperes Kilovoltamperes Millivoltamperes 8 If the turns ratio of a transformer is 5:1, and the primary has 100 turns, then there must be________ turns on the secondary. 5 100 150 20 9 The transformer core is used to provide a controlled path for the magnetic flux generated in the transformer by current flowing through the ________. Input connections Output connections Windings (or coils) Core 10 A transformer sealed in an enclosure capable of moving excessive heat away from the core and coils without ventilation openings or other heat dissipation means is called a ________. Dry type transformer Liquid-filled transformer Encapsulated transformer Isolation transformer None of the above 11 Voltages induced in the core are called Eddy Currents, and are helpful. True False 12 If the secondary winding has fewer turns than the primary winding, the transformer is called a step-up transformer. True False 13 The input side of a transformer is called the primary or primary side because this is where the main electrical connection to the utility or power source occurs. True False 14 Current and Potential are two types of ________ transformers. Distribution Power Isolation Rectifier Instrument 15 Given that Power is always equal on both sides of the transformer, when voltage increases, amperage ________. Increases Decreases Stays the same 16 When two secondary windings of a single phase transformer are connected in series, their voltage is added. When two secondary windings are connected in parallel, their currents are ________. Added Subtracted Multiplied Divided 17 A transformer used primarily to couple electrical energy from a power supply line to a circuit system is called a ________ transformer. Distribution Power Isolation Rectifier Instrument 18 The ratio between the number of actual turns of wire in each coil is the key to determining what the output voltage will be. True False 19 A transformer designed to operate in air without requiring the assistance of a liquid to dissipate excess heat is called a ________. Dry type transformer Liquid-filled transformer Encapsulated transformer Isolation transformer None of the above 20 In a step-up transformer, the secondary voltage is ________. Lower Higher The same

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