distribution transformer Quiz Practice Quiz…

Q: What is the primary function of a distribution transformer?

To step down voltage for local consumption. — Distribution transformers reduce high voltage to usable levels for homes and businesses.

Q: Where are distribution transformers typically located?

Near consumers (e.g., on poles or in underground vaults). — They are placed near end users to provide the necessary voltage levels.

Q: What type of core is commonly used in distribution transformers?

Laminated steel core. — Laminated steel reduces eddy current losses and improves efficiency.

Q: What is the typical voltage range of the secondary side of a distribution transformer in North America?

120/240 V. — This is the common voltage supply for residential and small commercial buildings.

Q: What is the purpose of a conservator tank in some distribution transformers?

To prevent moisture from entering the transformer oil. — It provides space for oil expansion/contraction and prevents air/moisture ingress.

Q: What type of cooling method is most frequently employed in small distribution transformers?

Oil-immersed, self-cooled (ONAN). — ONAN is a simple and effective method for cooling small to medium sized transformers.

Q: Which of the following is a protective device commonly used with distribution transformers?

Fuse or circuit breaker. — Fuses/breakers protect against overcurrents and faults.

Q: What is the core purpose of transformer oil in a distribution transformer?

Both a and b. — Transformer oil acts as both an insulator and a cooling medium.

Q: What does 'ONAN' stand for in the context of transformer cooling?

Oil Natural Air Natural. — It describes the natural circulation of oil and air for cooling.

Q: Which of the following losses is typically the most significant in a distribution transformer?

Core losses (iron losses). — Core losses are present 24/7 regardless of the load, often outweighing other losses.

Question 1 of 10

What is the primary function of a distribution transformer?

Distribution transformers reduce high voltage to usable levels for homes and businesses.

Question 2 of 10

Where are distribution transformers typically located?

They are placed near end users to provide the necessary voltage levels.

Question 3 of 10

What type of core is commonly used in distribution transformers?

Laminated steel reduces eddy current losses and improves efficiency.

Question 4 of 10

What is the typical voltage range of the secondary side of a distribution transformer in North America?

This is the common voltage supply for residential and small commercial buildings.

Question 5 of 10

What is the purpose of a conservator tank in some distribution transformers?

It provides space for oil expansion/contraction and prevents air/moisture ingress.

Question 6 of 10

What type of cooling method is most frequently employed in small distribution transformers?

ONAN is a simple and effective method for cooling small to medium sized transformers.

Question 7 of 10

Which of the following is a protective device commonly used with distribution transformers?

Fuses/breakers protect against overcurrents and faults.

Question 8 of 10

What is the core purpose of transformer oil in a distribution transformer?

Transformer oil acts as both an insulator and a cooling medium.

Question 9 of 10

What does 'ONAN' stand for in the context of transformer cooling?

It describes the natural circulation of oil and air for cooling.

Question 10 of 10

Which of the following losses is typically the most significant in a distribution transformer?

Core losses are present 24/7 regardless of the load, often outweighing other losses.

distribution transformer Quiz