A step-down transformer is connected to a 240 | vedclass

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

Question

(C) Given:Primary voltage $(V_p)$ = $2400 \, V$Secondary current $(I_s)$ = $80 \, A$Turns ratio $(N_p : N_s)$ = $20 : 1$Efficiency $(\eta)$ = $100\%$F

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(C) Given:Primary voltage $(V_p)$ = $2400 \, V$Secondary current $(I_s)$ = $80 \, A$Turns ratio $(N_p : N_s)$ = $20 : 1$Efficiency $(\eta)$ = $100\%$For an ideal transformer, the ratio of voltages is equal to the ratio of turns:$\frac{V_s}{V_p} = \frac{N_s}{N_p}$$\frac{V_s}{2400} = \frac{1}{20}$$V_s = \frac{2400}{20} = 120 \, V$Since the efficiency is $100\%$, the input power equals the output power:$P_{in} = P_{out}$$V_p 	imes I_p = V_s 	imes I_s$$2400 	imes I_p = 120 	imes 80$$2400 	imes I_p = 9600$$I_p = \frac{9600}{2400} = 4 \, A$Therefore, the current in the primary coil is $4 \, A$.

$A$ step-down transformer is connected to a $2400 \, V$ line, and $80 \, A$ of current is found to flow in the output load. The ratio of the turns in the primary and secondary coil is $20 : 1$. If the transformer efficiency is $100\%$, then the current flowing in the primary coil will be: (in $A$)

Similar Questions

The primary coil of a transformer is connected to a $220 \,V$ $AC$ source. The number of turns in the primary and secondary coils are $100$ and $10$ respectively. The secondary coil is connected to two resistors in series as shown in the figure. The output voltage $\left(V_0\right)$ is: (in $\,V$)

$A$ step-up transformer has $300$ turns of primary winding and $450$ turns of secondary winding. The primary is connected to $150 \ V$ and the current flowing through it is $9 \ A$. The current and voltage in the secondary are:

The number of turns in the primary and secondary coils of a transformer are $50$ and $200$ respectively. If the current in the primary coil is $4 \,A$, then the current in the secondary coil is: (in $\,A$)

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

$A$ transformer connected to a $220 \, V$ line shows an output of $2 \, A$ at $11000 \, V$. The efficiency is $100 \%$. The current drawn from the line is ...... $A$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module