Wattmeter Construction and Working

Q.

What are the four types of potentiometers?

Q. In an electrodynamometer type of wattmeter

1. the current coil is made fixed
2. the pressure coil is fixed
3. any of the two coil i.e. current coil or pressure coil can be made fixed
4. both the coils should be movable

Q. A wattmeter is connected as shown in the figure.
The wattmeter reads

1. Zero always
2. Total power consumed by $Z_1$ and $Z_2$
3. Power consumed by $Z_1$
4. Power consumed by $Z_2$

Q.

What Is Ideal Galvanometer?

Q. The voltage v(t) across a load and current i(t) through the load is given by following expression shown below,
$\text{v(t) = 100 sin}\omega \text{t + 200 sin 3}\omega \text{t Volts}$
$\text{i(t) = 10 sin}(3\omega t-{30}^0\text{) + 10 sin}(\omega t-{60}^o)\text{Amps}$
The value of average power for the load will be_____ W.

1. 1116.02

Q. In an uncompensated Electrodynamometer wattmeter, when a current
$\text{i(t) = [8 sin(}\omega \text{t - 30) + 12 sin(2}\omega \text{t - 10)] A}$ is applied to its current coil and a voltage
$\text{v(t) = [(250sin(}\omega \text{t + 10) + 300 sin(3}\omega \text{t - 40)] V}$ is applied to pressure coil, then the meter will read ______watt.

1. 766.04