Q.

In a dc machine

• AThe current and emf in armature conductors are alternating while those at the terminals are unidirectional
• BThe current and emf in armature conductors are unidirectional while those at the terminals are alternating
• CThe current and emf in armature conductors and at the terminals are unidirectional
• DThe emf in armature conductors and at the terminals is alternating while current  there is unidirectional