DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce sparking They reduce armature reaction They have longer life They have lower resistance They reduce sparking They reduce armature reaction They have longer life They have lower resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors The dirction of rotation of a dc series motor can be changed by None of the listed here Interchanging field terminals Either of Interchanging field or Interchanging supply Interchanging supply terminals None of the listed here Interchanging field terminals Either of Interchanging field or Interchanging supply Interchanging supply terminals ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is 6.77% 8.85% 4.76% 2.22% 6.77% 8.85% 4.76% 2.22% ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc motor constant torque is produced due to Commutator End plates Pole shoes Rotor laminations Commutator End plates Pole shoes Rotor laminations ANSWER DOWNLOAD EXAMIANS APP
DC Motors A three point starter is considered suitable for Shunt motors Shunt, compound and series motors Shunt as well as compound motors All D.C. motors Shunt motors Shunt, compound and series motors Shunt as well as compound motors All D.C. motors ANSWER DOWNLOAD EXAMIANS APP
DC Motors The starting resistance of a DC motor is generally 1000 Ω Infinitely large Low Around 500 Ω 1000 Ω Infinitely large Low Around 500 Ω ANSWER DOWNLOAD EXAMIANS APP
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