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Alternating Current
Transformers
2 questions from 2 papers, each with its answer.
- questions
- 2
- papers
- 2
- years asked, 2017–2026
- 1 of 10
- of Alternating Current
- 3.33%
Appears in
Concepts tested
- Transformer efficiency
- Turns ratio and voltage ratio in an ideal transformer
All Questions
2024 1 question
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In an ideal transformer, the turns ratio is $\frac{N_p}{N_s} = \frac{1}{2}$. The ratio $V_s : V_p$ is equal to (the symbols carry their usual meaning):For an ideal transformer: $\frac{N_p}{N_s} = \frac{V_p}{V_s} = \frac{1}{2}$ $\Rightarrow \frac{V_s}{V_p} = \frac{2}{1}$ $V_s : V_p = 2 : 1$
2014 AIPMT 1 question
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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:$\eta = \frac{V_SI_S}{V_PI_P} \Rightarrow 0.9 = \frac{V_S(6)}{3\times10^3} \Rightarrow V_S = 450$ V
$V_PI_P = 3000$ W, so $I_P = \frac{3000}{200} = 15$ A