Electrical Machines If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to? 1000 rpm 950 rpm 940 rpm 975 rpm 1000 rpm 950 rpm 940 rpm 975 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 1.06 0.95 0.96 0.87 1.06 0.95 0.96 0.87 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to greater than one. less than one. approx to one. very low greater than one. less than one. approx to one. very low ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on stray losses. core losses. dielectric losses. copper losses. stray losses. core losses. dielectric losses. copper losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle? 30° 10° 45° 60° 30° 10° 45° 60° ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What are slot wedges in a DC machine made of? Mild steel. Cast iron. Fibre. Silicon steel. Mild steel. Cast iron. Fibre. Silicon steel. ANSWER DOWNLOAD EXAMIANS APP
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