DC Motors Differentially compound D.C. motors can find applications requiring Variable speed Low starting torque Frequent on-off cycles High starting torque Variable speed Low starting torque Frequent on-off cycles High starting torque ANSWER DOWNLOAD EXAMIANS APP
DC Motors During rheostat braking of dc series motor Motor is run at reduced speed Motor is reversed in direction None of the listed here Motor is run as a generator Motor is run at reduced speed Motor is reversed in direction None of the listed here Motor is run as a generator 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% 2.22% 4.76% 8.85% 6.77% 2.22% 4.76% 8.85% ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be Rated full-load current Less than full-load current Almost negligible More than full-load current Rated full-load current Less than full-load current Almost negligible More than full-load current ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 100% of the previous value 10% of the previous value 50% of the previous value 25% of the previous value 100% of the previous value 10% of the previous value 50% of the previous value 25% of the previous value ANSWER DOWNLOAD EXAMIANS APP
DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit A resistance is connected in series with armature Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected parallel to the armature A resistance is connected in series with armature Armature is temporarily open circuited A high value resistor is connected across the field winding A resistance is connected parallel to the armature ANSWER DOWNLOAD EXAMIANS APP
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