D.C. Generators

A. brushes
B. field
C. armature
D. load

A. 640 V
B. 620 V
C. 600 V
D. 580 V

A. multiplication of front and back pitches
B. division of front pitch by back pitch
C. sum of front and back pitches
D. difference of front and back pitches

A. to reduce the reluctance of the mag¬netic path
B. to spread out the flux to achieve uniform flux density
C. to support the field coil
D. to discharge all the above functions

A. neutralising residual magnetism
B. creating residual magnetism by a D.C. source
C. making the magnetic losses of forces parallel
D. increasing flux density by adding extra turns of windings on poles

A. rotary converter
B. mercury are rectifier
C. induction motor D.C. generator set
D. synchronous motor D.C. generator set

A. number of armature coils
B. number of armature coil sides
C. number of armature conductors
D. number of armature turns

A. lap winding
B. wave winding
C. delta winding
D. duplex wave winding

A. wave wound
B. lap wound
C. delta wound
D. duplex wound

A. oscillating magnetic field
B. pulsating magnetic flux
C. relative rotation between field and armature
D. all above