Transformer

In a transformer turn’s ratio refers to

A transformer with turns ratio $\frac{N_1}{N_2}=\frac{50}{1}$ is connected to a $120 \mathrm{V}$ AC supply. If primary and secondary circuit resistances are $1.5 \mathrm{k\Omega }$ and $1 \mathrm{\Omega }$ respectively, then find out power of output

 

A $12 \mathrm{V}, 60 \mathrm{W}$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220 \mathrm{V}$. Assuming the transformer to be ideal, what is the current in the primary winding?

An ideal transformer with purely resistive load operates at $12 \mathrm{kV}$ on the primary side. It supplies electrical energy to a number of nearby houses at $120 \mathrm{V}.$ The average rate of energy consumption in the houses served by the transformer is $60 \mathrm{kW}.$ The value of resistive load $\left(R_s\right)$ required in the secondary circuit will be$\mathrm{\_\_\_\_\_\_\_\_\_m\Omega }.$

In the transformer shown in the figure, the ratio of the number of turns of the primary to the secondary is $\frac{N_1}{N_2}=\frac{1}{50}$. If a voltage source of $10 \mathrm{V}$ is connected across the primary, then the induced current through the load of $10 \mathrm{k\Omega }$ in the secondary is:

A transformer operating at primary voltage$8 \mathrm{kV}$ and secondary voltage $160 \mathrm{V}$ serves a load of $80 \mathrm{kW}$. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be 

Why the voltage Regulation is with respect to the full load voltage in transformes?

Both Westinghouse and Edison proposed methods for supplying electricity to homes. What advantage did Westinghouse's method have over Edison's$?$

What is correct for real transformer?

A doorbell which requires $0.4A$ of current is connected to an ideal step down transformer with $2300$ turns in its primary which is connected to a $230V$ household outlet. If the bell draws $2.4W$ of power from the transformer, the number of turns in the secondary is

A transformer is designed to convert voltage of $240 \mathrm{V}$ a.c. mains to $12 \mathrm{V}.$ The transformer is $100\%$ efficient. If the current in the secondary is $0.4 \mathrm{A},$ the primary current is

A transformer is used to reduce the mains supply of $220 \mathrm{V}$ to $11 \mathrm{V}$. If currents in the primary and secondary are $5 \mathrm{A}$ and $90 \mathrm{A}$ respectively, then efficiency of the transformer is

Find the current flowing in the primary coil, if the secondary coil of an ideal step down transformer is delivering $500 \mathrm{W}$ power at $12.5 \mathrm{A}$ current. The ratio of turns in the primary to the secondary is $5:1.$

The transformation ratio in the step-up transformer is 

The humming noise in transformer also depends upon the _____________ of the AC supply.

The humming can reduce the mechanical strength of the transformer core.

The main cause of transformer noise is _____.

What is humming loss in transformer?What is the reason of humming sound in transformer?

The open-circuit test in a transformer is used to measure 

Write one of the cause of energy loss in Transformer.