a) A $100\text{ KVA}$, $2200/440\text{ V}$ transformer has $R_1 = 0.3…
Previous year question for ELECTRICAL MACHINES-I.
Question
a) A $100\text{ KVA}$, $2200/440\text{ V}$ transformer has $R_1 = 0.3\text{ }\Omega$; $X_1 = 1.1\text{ }\Omega$; $R_2 = 0.01\text{ }\Omega$ and $X_2 = 0.035\text{ }\Omega$. Calculate i) the equivalent impedance of the transformer referred to the primary and ii) total copper losses. (10)
b) Why are Autotransformers not safe for supplying a low-voltage from high-voltage source? Also Explain the construction and principle of working of Autotransformer. (10)
- Year: 2018
- Subject: ELECTRICAL MACHINES-I