Transformer

---

---

Q1:-Transformer are rated in

1. kilo watt
2. kilo watthour
3. kilo volt amperes
4. kilo volt

ANSWER:-3

---

---

Q2:-Which of the common method of cooling a power transformer

1. air cooling 
2. air bast cooling
3. oil cooling 
4. natural cooling 

ANSWER:-3

---

---

Q3:-The efficiency of a power transformer is maximum at

1. nearly full load 
2. 1/2 full load 
3. 1/4 full load
4. 1/8 full oad

ANSWER:-1

---

---

Q4:-What type of core is used for a high frequency transformer

1. open iron core
2. closed iron core
3. shell type iron core
4. air core

ANSWER:-4

---

---

Q5:-Which of the statements below is true about the auto transformer?

1. it has two separate windings connected in series externally
2. it has only one windings .
3. it can only step down the voltage.
4. it is most suitable for power transformation.

ANSWER:-2

---

---