Multiple Choice
The main reason why electricity transmission and distribution as three-phase a.c. is because
A) for a given load, it is more economical than single phase.
B) the voltage drops along single-phase lines are excessively high.
C) it is essential in order to maintain a balanced load.
Correct Answer:

Verified
Correct Answer:
Verified
Q20: When constructing a three-phase phasor diagrem, it
Q21: When constructing a three-phase phasor diagram, the
Q22: For a balanced star-connected load the line
Q23: Using 'double-subscript notation', UAB is read as
Q24: For a balanced star-connected load, the neutral
Q25: Another advantage of three-phase systems, over single-phase
Q26: For a delta-connected supply, the line voltage
Q27: When constructing a three-phase phasor diagram, it
Q29: The three energised conductors that connect a
Q30: The secondary of a star-connected transformer supplies