After using for some time, big transformers get heated up. This is due to the fact that1. Current produces heat in transformers2. Hysteresis loss occurs in transformers3. Liquid used for cooling gets heatedSelect the correct answer using the code given below.

After using for some time, big transformers get heated up. This is due

1.	After using for some time, big transformers get heated up. This is due to the fact that1. Current produces heat in transformers2. Hysteresis loss occurs in transformers3. Liquid used for cooling gets heatedSelect the correct answer using the code given below.
A.	1 only
B.	2 and 3 only
C.	1 and 2 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3