Three Phase VSI with 120° and 180° Conduction Mode

If T1 is gated at 0°, T3 and T5 will start conducting at _______ and _________ ?
Safe commutation can be achieved in case of the ____________ operating mode?
A 3-phase inverter delivers power to a resistive load from a DC source Vs. For star connected load of R Ω per phase, the rms value of load current Ior for 180° conduction mode is ?
The peak value of the line voltage in case of 120° mode of operation of a three-phase bridge inverter is?
A 3-phase inverter delivers power to a resistive load from a DC source Vs. For star connected load of R Ω per phase, the load power for 180° degree mode of operation is?