Exercise (Conceptual Questions)

Why is the core of a transformer laminated?

Which type of losses do not occur in the transformer?

A $100 \Omega$ resistor is connected to a $220 \mathrm{V}, 50 \mathrm{Hz}$ ac supply. What is the rms value of current $\left(\mathrm{A}\right)$ in the circuit?

A current in circuit is given by $i=\left(3+4\sin \omega t\right) \mathrm{A}$. Then the effective value of current is (in $\mathrm{A}$) :

A capacitor of capacity $C$ has reactance $X$. If capacitance and frequency become double then reactance becomes $\frac{X}{2\alpha }$. Find value of $\alpha$.

An inductance of $1 \mathrm{mH},$ a condenser of $10 \mu \mathrm{F}$ and a resistance of $50 \mathrm{\Omega }$ are connected in series. The reactance of inductor and condensers are same. The reactance of either of them will be

In an A.C. circuit inductance, capacitance and resistance are connected. If the effective voltage across inductance is V_L, across capacitance is V_C, and across resistance is V_R, then the total effective value of voltage is :

The hot wire ammeter measures: