RMS and Average value

Q. The rms value of the current i(t) in the circuit shown below is

1. $\frac{1}{2}A$
2. $\frac{1}{\sqrt{2}}A$
3. 1 A
4. $\sqrt{2}A$

Q. The rms value of a half wave rectified symmetrical square wave current of 2 A is

1. $\sqrt{2}$ A
2. 1 A
3. $\frac{1}{\sqrt{2}}$ A
4. $\sqrt{3}$ A

Q. The RMS value of the voltage u(t) = 3 + 4cos(3t) is

1. $\sqrt{17}$ V
2. 5 V
3. 7 V
4. $(3+2\sqrt{2})$ V

Q.

Assuming ideal opamp, the RMS voltage (in mV) in the output $V_0$ only due to the 230 V, 50 Hz interference is (up to one decimal place)

1. 10.84

Q.

In the circuit shown below:

$(v_1+v_2)=\left[1sin\right(2\pi 10000t)+1sin(2\pi 30000t\left)\right]V$

The RMS value of the current through the resistor R will be minimum if the value of the capacitor C in microfarad is

1. 0.28

Q.

The rms value of the phasor current I in the circuit shown (in amperes) is

1. 1