Question

The input impedance of the permanent magnet moving coil (PMMC) voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is

• A. 4.46
• B. 3.15
• C. 2.23
• D. 0

Answer 1

The correct option is A 4.46

In the positive half cycle, D is ON
$\Rightarrow V_0=0V$
In negative half cycle, D is OFF, PMMC voltmeter mesasures average value of $V_0$.
In case of half wave rectification,
$V_{0avg.}=\frac{14.14}{\pi }\times \frac{100}{101}$
$=4.456V$