A. brushes
B. field
C. armature
D. load
In a D.C. generator the critical resistance refers to the resistance of_____________? Read More »
D.C. Generators 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
In the case of lap winding resultant pitch is____________? Read More »
D.C. Generators 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
The function of pole shoes in the case of D.C. machine is______________? Read More »
D.C. Generators 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
Flashing the field of D.C. generator means:______________? Read More »
D.C. Generators 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
Welding generator will have____________? Read More »
D.C. Generators A. wave wound
B. lap wound
C. delta wound
D. duplex wound
Equilizer rings are required in case armature is_______________? Read More »
D.C. Generators A. oscillating magnetic field
B. pulsating magnetic flux
C. relative rotation between field and armature
D. all above
Eddy currents are induced in the pole shoes of a D.C. machine due to______________? Read More »
D.C. Generators