I. A transformer changes 120 V If the secondary coil has 16 turas, how many tura

Question

I. A transformer changes 120 V If the secondary coil has 16 turas, how many turas does the primary (a) 40 turns (b) 160 turas (c) 20 taras (d) 320 taras () 80 turas across the primary to 24 V across the secondary For the next eight problems, an AC generator supplies a rms voltage of 120 v at 60 Hz It is connected in series with an 85 mH inductor, a 30 uF capacitor & an 45 2 resistor. 2. What is the resonant frequency of this circuit? (a) 62.42 kHz (b) 100 Hz (c) 2.464 MHz (d) 3.935 kHz (e) 3.152 kHz Determine the peak voltage of the generator. 20 V (b) 110 v (c) 156 v (d) 170 v (e) 53 v

Explanation / Answer

1] Here we have Vp/Vs = Np/Ns

Np = Ns*Vp/Vs = 16*120/24 = 80 turns

2] f0 = 1/[2pi*sqrt(LC)] = 1/[2pi*sqrt(85e-3*30e-6)]

= 100 Hz

3] Peak voltage = 120*sqrt 2 = 170 V

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