When $p$-type and $n$-type semiconductors are brought into contact,they form a $P-N$ junction which acts as a .........

What is a filter circuit?

Match List $I$ with List $II$.

List $I$	List $II$
$(a)$ Rectifier	$(i)$ Used either for stepping up or stepping down the $a.c.$ voltage
$(b)$ Stabilizer	$(ii)$ Used to convert $a.c.$ voltage into $d.c.$ voltage
$(c)$ Transformer	$(iii)$ Used to remove any ripple in the rectified output voltage
$(d)$ Filter	$(iv)$ Used for constant output voltage even when the input voltage or load current change

Choose the correct answer from the options given below:

$A$ half-wave rectifier provides a load current of $1 \ k\Omega$. The input voltage is $220 \ V$. Neglecting the diode resistance,the values of average $DC$ voltage and average $DC$ current are respectively:

For the given circuit shown in the figure,to act as a full-wave rectifier: $a.c.$ input should be connected across .............. and .................,and the $d.c.$ output would appear across ............. and ..................

In the block diagram of a simple rectifier circuit,from a variable $A.C.$ voltage,constant $D.C.$ voltage is obtained. The correct order of operation is