Electrical Machines The starting resistance of DC motor is generally 1000 ohms. Low. Infinitely large. around 500 ohms. 1000 ohms. Low. Infinitely large. around 500 ohms. 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%. 940 RPM 970 RPM 920 RPM 960 RPM 940 RPM 970 RPM 920 RPM 960 RPM ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will reduce by 5 %. increase by 5 %. depend on other factors. remain unchanged. reduce by 5 %. increase by 5 %. depend on other factors. remain unchanged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A differentially compound motor under high-over-load conditions will behave like a / an cummulative compound motor. series motor. shunt motor. AC synchronous motor. cummulative compound motor. series motor. shunt motor. AC synchronous motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is 200Hz. 50Hz. 150Hz. 100Hz. 200Hz. 50Hz. 150Hz. 100Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following load normally needs starting torque more than rated torque? Centrifugal pumps. Air compressors. Conveyers. Blowers. Centrifugal pumps. Air compressors. Conveyers. Blowers. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS