Chapter 1 Review

Welcome to your Chapter 1 Review

1. Electric energy can be transformed from one [ ___ ] level to another.
2. What is the prime function of a transformer?
3. If the line voltage is 120 volts and the transformer secondary voltage is 12 volts, the transformer would be called:
4. The ratio of primary voltage to secondary voltage in a transformer is:
5. A load on a transformer is:
6. If a transformer is rated 1000 VA and has a secondary voltage of 200 volts, what is the rated secondary current?

7. The transformer load current is 10 amperes and the load resistance is 5 ohms. What power must the transformer be capable of supplying?

8. A transformer is rated 5000 VA and has a rated primary voltage of 500 volts. The secondary full load current is 50 amperes. What is the secondary voltage and the turns ratio?
9. A transformer is rated 1 kVA. What is the volt ampere rating?

10. A transformer is designed to carry a load of 5000 VA. What is its kVA rating?
11. The plant voltage is 480 volts 60 Hertz and you have used a 120 volt oven to install. How can the oven be operated?
12. The oven discussed in question 11 has resistance heating elements and is rated 2.4 KW (kilowatts). The transformer should have what voltage rating in volts and power rating in kVA?
13. The same oven and installation as discussed in 11 and 12.
What is the supply line current arrl the load current?
14. What happens when 120 volts D.C. is applied to a power transformer rated 120 volts to 12 volts?
15. The windings in a transformer are insulated from each other and from the core because:
16. If a transformer is rated 480 volts primary and 120 volts secondary and has 480 turns on the primary, what are the volts per turn on the primary and the secondary?
17. The equations for power are:Your new question!
18. Ohm's law can be written:
19. Which of the following relationships are true? (There are more than one).
Turns ratio= N<sub>pri</sub> / N<sub>sec</sub>
20. Which of the following are true? (multiple answers)

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