Transformer

Q.

The primary winding of an ideal transformer has $1000$ turns whereas its secondary has $5000$ turns the primary is connected to an ac supply of $220v$ $50Hz$ the secondary will have an output of ____.

Q. A step down transformer is used to reduce the main supply of $220\text{V}$ to $10\text{V}$. If the primary draws $5\text{A}$ and secondary draws $88\text{A}$ current, calculate the efficiency of the transformer.

1. $60$%
2. $70$%
3. $80$%
4. $90$%

Q. The ratio of number of turns of primary coil to secondary coil in a transformer is $2:3$. If a source of $6\text{V}$ ac is connected across the primary coil, then e.m.f. across the secondary coil (in volts) will be

Q. In a transformer, number of turns in primary coil are 140 and that in the secondary are 280. If current in primary is 4A then that in the secondary is

1. 4 A
2. 2 A
3. 6 A
4. 10 A

Q.

The turn ratio of a transformers is given as 2 : 3. If the current through the primary coil is 3 A, thus calculate the current through load resistance

1. 1 A

2. 4.5 A

3. 2 A

4. 1. 5 A