COMEDK 2024 Shift 1 Paper

First, let's identify the voltage transformation ratio for the transformer. The primary voltage Vp is 330 V and the secondary voltage Vs is 33 V . The voltage transformation ratio k is given by:
k=‌

Vp

Vs

=‌

330

33

=10
This means the primary voltage is 10 times the secondary voltage.
Next, we need to determine the current in the secondary coil, which can be found using Ohm's Law. The impedance of the device connected to the secondary coil is given as 110Ω, and the voltage across it is 33 V :
Is=‌

Vs

Z

=‌

33

110

=0.3A

Now, using the current transformation relation in a transformer, which is inversely proportional to the voltage transformation ratio:
Ip=‌

Is

k

=‌

0.3

10

=0.03A
The current drawn by the primary coil of the transformer is therefore 0.03 A .
So, the correct answer is:
Option B:
0.03A