Alternating Current - Result Question 33
«««< HEAD:content/english/neet-pyq-chapterwise/physics/alternating-current/alternating-current-result-question-33.md
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 :
======= ####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 :
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/alternating-current/alternating-current—result-question-33.md (a) $300 V, 15 A$
(b) $450 V, 15 A$
(c) $450 V, 13.5 A$
(d) $600 V, 15 A$
[2014]
Show Answer
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
$I_p=\frac{3000}{V_p}=\frac{3000}{200} A=15 A$
