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JEE 2020 Physics: Transformers & LC Oscillations Quiz (13.09.2019)

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Question 1

Frequency of oscillation of current in the inductor in given LC circuit is

Question 2

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns, giving the output power at 230 V. If the current in the primary of the transformer is 5 A, and its efficiency is 90%, the output current would be :

Question 3

The current flowing through the resistance in a series L–C–R A.C. circuit is I / R= ε (ε = source voltage). Now, the inductance and capacitance are connected in parallel and joined in series with the resistance as shown in the figure. The current in the resistance is now, (symbols have their usual meaning)

Question 4

A group of friends were planning to conduct an experiment of radio waves transmission, which of the following should be selected for the better tuning of an LCR circuit if they use this experiment for communication purpose?

Question 5

The LC parallel resonant circuit

Question 6

A capacitor (2mF) is charged to 10C and then is connected to a inductor of L=6H. What will be the voltage across the capacitor in the LC circuit just after the connection is established?

Question 7

A transformer has 100 turns in primary and 200 turns in the secondary. If primary is connected 220 V DC supply, the voltage across the secondary coil is

Question 8

The output voltage of a transformer connected to 220 V line is 1100 V at 2 A current. Its efficiency is 100%. The current coming from the line is

Question 9

For a transformer, the turns ratio is 3 and its efficiency is 0.75. The current flowing in the primary coil is 2 A and the voltage applied to it is 100 V. Then the voltage and the current flowing in the secondary coil are ______ resoectively.

Question 10

The current graph for resonance in LC circuit is

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Sep 12JEE & BITSAT