Electrical Machines Ideal value of voltage regulation of a device is? ∞ a positive finite value 0 a finite negative value ∞ a positive finite value 0 a finite negative value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction in DC generators will result in reduction in generated emf. increase in slip. short circuit. open circuit. reduction in generated emf. increase in slip. short circuit. open circuit. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor None of these. Decrease. Remains same. Increase. None of these. Decrease. Remains same. Increase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Ward Leonard control provides speed control above rated speed. in both direction. below rated speed. in one direction only. above rated speed. in both direction. below rated speed. in one direction only. ANSWER DOWNLOAD EXAMIANS APP
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%. 920 RPM 960 RPM 970 RPM 940 RPM 920 RPM 960 RPM 970 RPM 940 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breadth factor is defined as the ratio of emf with distributed winding to emf with concentrated winding. emf with concentrated winding to emf with distributed winding. None of these both 1 and 2. emf with distributed winding to emf with concentrated winding. emf with concentrated winding to emf with distributed winding. None of these both 1 and 2. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS