A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

• A.  less than 6 V
• B.  6 V
• C.  zero
• D.  more than 6 V

Answer: (D)