Numerical explaning PMMC reads the average value only (07:46)

Lecture Notes

Let us see Numerical explaining PMMC reads the average value only.

Q. A PMMC voltmeter is connected across a series combination of a DC voltage source V₁ = 2V and AC voltage source V₂(t) = 3 sin(4t) V. The meter
reads [2005]

a) 2 V

b) 5 V

c) \left ( 2+\frac{\sqrt{3}}{2} \right )V

d) \frac{\sqrt{17}}{2} \right )V

Ans.

We know that PMMC reads average value.

V₁ = 2V

Average value of V₁ = 2V

V₂(t) = 3 sin (4t) V

Average value of V₂ = 0 V

Total Voltage across PMMC = V_T = V₁ + V₂

Average value of V_T = Average value of V₁ + Average value of V₂

Average value of V_T = 2+0 = 2 V

So, PMMC or meter reads 2 V .

So, option (a) is the correct answer.