11. TFA shielded transformer is indicated with dashed lines around the symbol. p
ID: 2293825 • Letter: 1
Question
11. TFA shielded transformer is indicated with dashed lines around the symbol. pnmary winding of a transformer is connected to the load. urns per volt ratio of a secondary winding is the same as that of the primary 12. T F Th winding. 14. TF A trans step-up transformer has more turns on the primary than on the secondary. 15. T F Hysteresis loss is lower at higher frequencies. 16. T F FR losses are reduced by using larger wire in the windings 17. T 18. T F 19. TFA transformer is most efficient when operated at its rated power. 20. T F It is permissible to exceed the current rating of one of many secondary coils, as long Silicon steel is often used for a transformer core for low hysteresis loss. The energizing current in an unloaded transformer is zero. F as the total power and voltampere ratings are not exceeded. Incorrectly phased, parallel connected secondaries are likely to damage a transformer If the frequency of a source connected to a series LC circuit is higher than the reso 21. T F 22. T F nance frequency, the source current leads the voltage. 23. TF In RC circuits, the voltage leads the current. 24. T F The reactive current in a parallel RCL circuit may exceed the total current. 25. T F Assuming ideal components, the source frequency has no effect on the power used in 26. T F The reactive current in a parallel RCL circuit can exceed the total current. a parallel RC, RL, or RCL circuit. (Hint: PT-PR)Explanation / Answer
11 true - a shielded transformer is indicated with a dashed line. Dashed are indicated to show the barrier between primary and secondary.
12 false -secondary winding is always connected to the load.
13 false -they are not same. Step up transformer have higher secondary turn and step down have lower secondary turns.
14- false . Step up transformer have higher secondary turn
15 - false -since hysteresis loss is directly proportional to frequency. It increases with increase in frequency.
16 false -higher lengths have higher resistance. This it will increase the resistance loss.
17 - true -with the help.of silicon as a core hysteresis loss.is greatly reduced.
18- false -energizing current is very small .It is approximately 5% of the rated current.
19 -true -transformer efficiency is highest at rated condition.
20 - true.
21- true -incorrect polarity and phase can damage the transformer
22 true
23 false - In a rc circuit due to.capacitor current leads the voltage.
24 - true - it may increase by the amplification factor (quality factor) if operating at resonance.
25 true
26 true - same expalanatiin as 24
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