Electrical Machines Ward Leonard control provides speed control above rated speed. in one direction only. in both direction. below rated speed. above rated speed. in one direction only. in both direction. below rated speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The back emf produced in a dc motor depends on none of these. P and Z. P. Z. none of these. P and Z. P. Z. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The stator frame in an induction motor is used to protect the whole machine. provide return path for the flux. hold armature stamping in position. ventilate the armature. protect the whole machine. provide return path for the flux. hold armature stamping in position. ventilate the armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine is invariably provided with forced ventilation? Fractional horse power slow speed motor. Fractional horse power high speed motor. Hermetically sealed motor of refrigerator. 50 MW generator in a power plant. Fractional horse power slow speed motor. Fractional horse power high speed motor. Hermetically sealed motor of refrigerator. 50 MW generator in a power plant. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is 20 V 40 V zero 50 V 20 V 40 V zero 50 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load? 1130 r.p.m. 4575.4 r.p.m. 1037.5 r.p.m. none of above. 1130 r.p.m. 4575.4 r.p.m. 1037.5 r.p.m. none of above. ANSWER DOWNLOAD EXAMIANS APP
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