Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 920 RPM
 960 RPM
 940 RPM

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 differentially compounded motor in the same direction
 differentially compounded motor in the opposite direction
 cumulative compounded motor in the same direction
 cumulative compounded motor in opposite direction

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines