D.C. Motors

A. 4.0
B. 2.0
C. 1.0
D. 0.5

A. To reduce eddy current loss
B. To support the field coils
C. To spread out flux for better uniformity
D. To reduce the reluctance of the magnetic path

A. Starting torque
B. Operating speed
C. Full-load current
D. All of the above

A. Series motor
B. Shunt motor
C. Air motor
D. Battery operated motor

A. damage to commutator segments
B. damage to commutator insulation
C. increased power consumption
D. all of the above

A. as separately wound unit
B. in parallel with armature winding
C. in series with armature winding
D. in parallel with field winding

A. shunt
B. series
C. differentially compounded
D. cumulativelyc’ompounded

A. where load is constant
B. where load changes frequently
C. where constant operating speed is needed
D. in none of the above situations

A. nothing will happen to the motor
B. this will make armature to take heavy current, possibly burning it
C. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses D. motor will run at very slow speed

A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor