Transformers and Power Systems Practice Quiz…

Q: Transformers are rated in kVA instead of kW primarily because:

Transformer losses are constant regardless of the power factor. — Transformer losses (copper and iron losses) remain relatively constant irrespective of the load's power factor.

Q: What is the unit of measurement for transformer losses?

kVA — Transformer losses are expressed in VA or kVA.

Q: Copper losses in a transformer are primarily dependent on:

Current — Copper losses are related to the square of the current (I²R).

Q: Iron losses in a transformer are primarily dependent on:

Voltage — Iron losses are dependent on the voltage applied to the transformer.

Q: A transformer has a rating of 11 kVA. If the power factor of the load is 0.6, the output power will be:

6.6 kW — Output power = kVA * Power Factor = 11 kVA * 0.6 = 6.6 kW

Question 1 of 5

Transformers are rated in kVA instead of kW primarily because:

Transformer losses (copper and iron losses) remain relatively constant irrespective of the load's power factor.

Question 2 of 5

What is the unit of measurement for transformer losses?

Transformer losses are expressed in VA or kVA.

Question 3 of 5

Copper losses in a transformer are primarily dependent on:

Copper losses are related to the square of the current (I²R).

Question 4 of 5

Iron losses in a transformer are primarily dependent on:

Iron losses are dependent on the voltage applied to the transformer.

Question 5 of 5

A transformer has a rating of 11 kVA. If the power factor of the load is 0.6, the output power will be:

Output power = kVA * Power Factor = 11 kVA * 0.6 = 6.6 kW

Electrical