Alternating Current - Result Question 33
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35. A transformer having efficiency of $90 %$ is working on $200 V$ and $3 kW$ power supply. If the current in the secondary coil is $6 A$, the voltage across the secondary coil and the current in the primary coil respectively are :
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35. A transformer having efficiency of $90 %$ is working on $200 V$ and $3 kW$ power supply. If the current in the secondary coil is $6 A$, the voltage across the secondary coil and the current in the primary coil respectively are :
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $300 V, 15 A$
(b) $450 V, 15 A$
(c) $450 V, 13.5 A$
(d) $600 V, 15 A$
[2014]
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Answer:
Correct Answer: 35. (b)
Solution:
- (b) Efficiency $\eta=\frac{V_s I_s}{V_p I_p} \Rightarrow 0.9=\frac{V_s(6)}{3 \times 10^{3}}$
$\Rightarrow V_s=450 V$
As $V_p I_p=3000$ so
$I_p=\frac{3000}{V_p}=\frac{3000}{200} A=15 A$
