A transformer operating at primary voltage 8, | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) For an ideal transformer,the power delivered to the load is the same as the power drawn from the source.Given: Primary voltage $V_p = 8\,kV = 8000

Vedclass · Accepted Answer

$800\,\Omega$ and $0.32\,\Omega$

Vedclass · Answer

(C) For an ideal transformer,the power delivered to the load is the same as the power drawn from the source.Given: Primary voltage $V_p = 8\,kV = 8000\,V$,Secondary voltage $V_s = 160\,V$,Power $P = 80\,kW = 80000\,W$.The resistance in the primary circuit $R_p$ is given by $P = \frac{V_p^2}{R_p}$.$R_p = \frac{V_p^2}{P} = \frac{(8000)^2}{80000} = \frac{64 	imes 10^6}{8 	imes 10^4} = 8 	imes 10^2 = 800\,\Omega$.The resistance in the secondary circuit $R_s$ is given by $P = \frac{V_s^2}{R_s}$.$R_s = \frac{V_s^2}{P} = \frac{(160)^2}{80000} = \frac{25600}{80000} = 0.32\,\Omega$.Thus,the resistances are $800\,\Omega$ and $0.32\,\Omega$.

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

Similar Questions

The number of turns in the primary coil of a transformer is $200$ and the number of turns in the secondary coil is $10$. If $240 \ V$ $AC$ is applied to the primary,the output from the secondary will be......$V$.

In a step-up transformer, the turn ratio is $1 : 2$. A Leclanche cell $(e.m.f. = 1.5 \, V)$ is connected across the primary. The voltage developed in the secondary would be ......... $V$.

$A$ transformer has $100$ turns in the primary coil and carries $8 \, A$ current. If the input power is $1 \, kW$, the number of turns required in the secondary coil to have $500 \, V$ output is:

Large transformers,when used for some time,become hot and are cooled by circulating oil. The heating of a transformer is due to:

$A$ step-down transformer is used to reduce the main supply from $V_1$ volt to $V_2$ volt. The primary coil draws a current $I_1$ $A$ and the secondary coil draws $I_2$ $A$. $(I_1 < I_2)$. The ratio of input power to output power is

Vedclass Test Series

Exam Paper Generator

Online Exam Module