In the figure shown, assume
- $\alpha$ is the phase angle between the load current and the load voltage
- $\quad \beta$ is the phase angle by which pressure coil current lags the pressure coil voltage of the wattmeter
- $\quad \gamma$ is the phase angle between currents in the pressure coil and the current coil of the wattmeter
- $\delta$ is the phase angle of the voltage transformer
- $\theta$ is the phase angle of the current transformer
When the load has a lagging phase angle of $\alpha$, which one of the following options is correct?
$\alpha=-\gamma \pm \delta \pm \theta-\beta$
$\alpha=-\gamma \pm \delta \pm \theta+\beta$
$\alpha=\gamma \pm \delta \pm \theta+\beta$
$\alpha=\gamma \pm \delta \pm \theta-\beta$