# Transformer MCQ Questions Part 1

Transformer MCQ Questions Part 1 by ElectricalEngineeringMCQ

## Connecting 1000 KVA transformers in parallel

If two transformers of 1000 kVA are operated in parallel, the first one having a 6% impedance, and the other one having a 3% impedance, each having the same turns ratio are connected to a 1700 kVA common load. What is the correct statement about loading:

1. First one will be loaded by 56%
2. Both will be equally loaded
3. Second one will be loaded by 13%

Solution Formulas:

## No-load Power Factor of transformer MCQ

No-load power factor of transformer is low because:

1. Magnetizing component of Io is small
2. Magnetizing component of Io is large

Correct answer: 2. Magnetizing component of Io is large

## Which transformer connection will give the highest secondary voltage

Which of the following transformer connection will give highest secondary voltage:

1. Delta primary, Delta secondary
2. Delta primary, Star secondary
3. Star primary, Delta secondary
4. Star primary, Star secondary

Correct answer: 2. Delta primary, Star secondary

The delta primary, star secondary connection will provide the highest secondary voltage

## What is the approximate value of efficiency in large transformers

What is approximate value of efficiency in large transformers:

1. 50%
2. 74%
3. 89.93%
4. 95%

The approximate value of efficiency in large transformers is 95%

## What is the turns ratio of isolation transformer

What is the turns ratio of isolation transformer:

1. 0:1
2. 1:0
3. 1:1
4. None of these