In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?

A. Electrical power developed in armature – copper losses
B. Mechanical power input – iron and friction losses
C. Electrical power developed in armature – iron and copper losses
D. Mechanical power input – iron and friction losses – copper losses

A. B.JTs
B. MOSFETs
C. IGBTs
D. All of above

A. equal division of voltage across each thyristor
B. equal division of current through each thyristor in parallel
C. equal division of voltage across each thyristor in parallel
D. equal division of current through each thyristor in series

A. Load survey method
B. Mathematical method
C. Statistical method
D. Economic parameters

A. Decrease with frequency
B. Remains same with change in frequency
C. Increase with frequency
D. Either A. or B.

A. Two SCR’s in parallel opposition
B. Two SCR’s in series
C. Three SCR’s in series
D. Four SCR’s in series