Single Phase Full Wave Silicon Controlled Rectifier with R Load, RL Load & RLE Load

Which of the following expression is true for average output current in 1 phase full wave controlled rectifier with R load?
Which of the following value of α (in degrees) supports continuous current flow in 1 phase full wave controlled rectifier with R=100Ω, L=0.2H?
The full-wave controlled bridge rectifier has an ac input of 120V rms at 60 Hz and a 20Ω load resistor. The delay angle is 40°. Determine the average current in the load and the power absorbed by the load?
A controlled full-wave bridge rectifier has a source of 120 V rms at 60 Hz, an RL load where R = 10Ω and L = 100mH. The delay angle is 60°. Determine the power absorbed by the load?
A single-phase controlled, a full-bridge converter is supplying a highly inductive DC load. The conductor is fed from a 220V, 50Hz ac source. Find the fundamental frequency in Hz of the voltage ripple on the DC side?