Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

• A.  1 and 3
• B.  1 and 2
• C.  2 alone
• D.  1, 2 and 3

Answer: (D)