- (A) increase in armature current
- (B) increase in flux
- (C) decrease in reactance
- (D) decrease in back emf
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- (A) reducing the field current
- (B) decreasing the armature current
- (C) increasing the armature current
- (D) increasing the excitation current
- (E) none of the above methods
- (A) the field
- (B) the armature
- (C) the brushes
- (D) the commutator
- (A) Series motor
- (B) Shunt motor
- (C) Cumulatively compounded motor
- (D) Differentially compounded motor
- (A) severe sparking
- (B) rough commutator surface
- (C) imperfect contact
- (D) any of the above
- (A) ball bearings
- (B) bush bearings
- (C) magnetic bearmgs
- (D) needle bearings
- (A) double the number of poles
- (B) same as the number of poles
- (C) half the number of poles
- (D) two
- (A) all the four poles are north poles
- (B) alternate poles are north and south
- (C) all the four poles are south poles
- (D) two north poles follow two south poles
- (A) is amenable to better voltage control
- (B) is more stable
- (C) has exciting current independent of load current
- (D) has all above features
- (A) field control method
- (B) armature controlled method
- (C) field diverter
- (D) frequency control method
