Podcast
Questions and Answers
How do the thin, insulated laminations in the transformer core help reduce eddy current losses?
How do the thin, insulated laminations in the transformer core help reduce eddy current losses?
- They increase the resistance of the core material
- They increase the magnetic permeability of the core
- They create an easy path for current to flow through
- They do not provide an easy path for current, reducing eddy currents (correct)
What is the primary reason for laminating transformer cores?
What is the primary reason for laminating transformer cores?
- To increase the core's magnetic permeability
- To minimize eddy current losses (correct)
- To reduce the weight of the transformer
- To increase the transformer's efficiency
If the input power to a transformer is 650 W and the output power is 610 W, what is the efficiency of the transformer?
If the input power to a transformer is 650 W and the output power is 610 W, what is the efficiency of the transformer?
- 93.8% (correct)
- 92%
- 95%
- 90%
How can the power loss in a transformer be calculated?
How can the power loss in a transformer be calculated?
What is the primary purpose of a transformer?
What is the primary purpose of a transformer?
What is the primary method for minimizing copper losses in a transformer?
What is the primary method for minimizing copper losses in a transformer?
Which of the following factors contribute to hysteresis losses in a transformer?
Which of the following factors contribute to hysteresis losses in a transformer?
What is the primary reason for using laminated cores in transformers?
What is the primary reason for using laminated cores in transformers?
Which type of transformer has no hysteresis losses?
Which type of transformer has no hysteresis losses?
What is the primary effect of eddy currents in a transformer core?
What is the primary effect of eddy currents in a transformer core?
Which core material is best suited for minimizing hysteresis losses in a transformer?
Which core material is best suited for minimizing hysteresis losses in a transformer?
What is the impedance transformation ratio of the transformer?
What is the impedance transformation ratio of the transformer?
If the primary winding has a resistance of 25 Ω, what is the equivalent resistance of the secondary winding?
If the primary winding has a resistance of 25 Ω, what is the equivalent resistance of the secondary winding?
If the primary winding is rated for a maximum voltage of 200 V, what is the maximum voltage that can be safely applied to the secondary winding?
If the primary winding is rated for a maximum voltage of 200 V, what is the maximum voltage that can be safely applied to the secondary winding?
Which of the following factors determines the maximum current that can be carried by a transformer winding?
Which of the following factors determines the maximum current that can be carried by a transformer winding?
If the transformer is operating at 100% efficiency, what is the power relationship between the primary and secondary windings?
If the transformer is operating at 100% efficiency, what is the power relationship between the primary and secondary windings?
Which of the following statements about transformer ratings is true?
Which of the following statements about transformer ratings is true?
What is the purpose of impedance matching?
What is the purpose of impedance matching?
In the first example given, where the source impedance is 6 Ω and the load impedance is 2 Ω, what is the power dissipated in the source?
In the first example given, where the source impedance is 6 Ω and the load impedance is 2 Ω, what is the power dissipated in the source?
What is the total circuit resistance in the second example, where the source impedance and load impedance are both 6 Ω?
What is the total circuit resistance in the second example, where the source impedance and load impedance are both 6 Ω?
If the load impedance is equal to the source impedance, what is the ratio of power dissipated in the source to power delivered to the load?
If the load impedance is equal to the source impedance, what is the ratio of power dissipated in the source to power delivered to the load?
What is the circuit current in the second example, where the source voltage is 24 V and the total circuit resistance is 12 Ω?
What is the circuit current in the second example, where the source voltage is 24 V and the total circuit resistance is 12 Ω?
If the load impedance is greater than the source impedance, what happens to the power transfer efficiency?
If the load impedance is greater than the source impedance, what happens to the power transfer efficiency?
What type of transformer configuration is described where a single coil of wire is 'tapped' to produce a primary and secondary winding?
What type of transformer configuration is described where a single coil of wire is 'tapped' to produce a primary and secondary winding?
In an auto-transformer with an adjustable tap, when the tap is at point A, how does the secondary voltage (Es) compare to the primary voltage (Ep)?
In an auto-transformer with an adjustable tap, when the tap is at point A, how does the secondary voltage (Es) compare to the primary voltage (Ep)?
If a voltage of 200 V is applied between points B and C in an auto-transformer, what is the secondary voltage available from points A and B?
If a voltage of 200 V is applied between points B and C in an auto-transformer, what is the secondary voltage available from points A and B?
What is the voltage available from points A and C in the auto-transformer, if a voltage of 200 V is applied between points B and C?
What is the voltage available from points A and C in the auto-transformer, if a voltage of 200 V is applied between points B and C?
Which of the following is a brand name commonly used for adjustable auto-transformers?
Which of the following is a brand name commonly used for adjustable auto-transformers?
Under what condition can a transformer be used at frequencies above its normal operating frequency?
Under what condition can a transformer be used at frequencies above its normal operating frequency?
Flashcards are hidden until you start studying
