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 Excessive sparking at brushes may be caused due to Misaligment of machine Dirt on the commutator Loose coupling Worn bearings Misaligment of machine Dirt on the commutator Loose coupling Worn bearings 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 high value resistor is connected across the field winding A resistance is connected parallel to the armature Armature is temporarily open circuited A resistance is connected in series with armature A high value resistor is connected across the field winding A resistance is connected parallel to the armature Armature is temporarily open circuited A resistance is connected in series with armature ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which method of braking is generally used in elevators? Regenerative braking Rheostat braking Plugging None of these Regenerative braking Rheostat braking Plugging None of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors ______ motors never use belt connected loads. Shunt Cummulative compounded Series Differentially compounded Shunt Cummulative compounded Series Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors The direction of rotation of a D.C. series motor can be changed by None of these Interchanging supply terminals Either of (A) and (B) above Interchanging field terminals None of these Interchanging supply terminals Either of (A) and (B) above Interchanging field terminals ANSWER DOWNLOAD EXAMIANS APP
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