Ex. 8.1-The Autotransformer Conclusion CONCLUSION in this exercise, you an autot

Question

Ex. 8.1-The Autotransformer Conclusion CONCLUSION in this exercise, you an autotransformer in both step-u connected a standard two-winding transformer to operate as p and step-down configurations. Measurements apparent power on the primary and secondary sides of the circuit showed that tney are approximately equal except for the small difference caused by transformer losses. You also saw that the voltage and current relationships for an autotransformer are based on th e same rules as for standard transformers REVIEW QUESTIONS 1. An autotransformer is a special typ e of transformer that has a. a single winding which serves as both primary and secondary b. a separate primary and secondary winding c. more than one primary winding d. two secondary windings connected in series 2. The power on the primary side of an autotransformer is a. b. c. d. less than the power on the secondary side much greater than the power on the secondary side exactly equal to the power on the secondary side slightly greater than the power on the secondary side 3. What is the secondary voltage when a source voltage of 150-V is applied across the complete winding of a center-tapped autotransformer? a. 300 V b. 150 c. 75 V d. 225 v 4. The secondary current in a step-up autotransformer a. equals the turns ratio. b. cannot exceed the winding current c. is less than the primary current d. is not limited The apparent power rating of a 10:1 autotransformer is 450 VA. This means that the apparent power rating of the secondary is 5. a. 45 VA b. 4500 VA C. 450 VA d. none of the above 275 D Festo Didactic 30378-00

Explanation / Answer

1.solution:

a) a single winding which serves as both primary and secondary

[explanation:it is its property]

2.solution:

d)slightly greater than the power on the secondary side

[explanation:secondary side will have losses in power so its slightly less compare to primary]

3.solution:

b)150 V

[explanation:voltage cannot be changed in centertapped autotransformer.it is only balanced the voltage in the secondary winding]

4.solution:

a)eqyals the turns ratio.

[explanation:secondary current in a step-up auto transformer is only depends upon turns ratio and equals to its turns ratio]

5.solution:

b)4500V/A

[explanation:apparent power rating is depends on ratio only.that is 10:1 means the secondary apparent power rating is 10 times grater than the promary apparent power rating 4500V/A.]

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