Electrical Machines In dc machine armature windings are placed on rotor because of the necessity for development of torque. commutation. electromechanical energy conversion. generation of voltage. development of torque. commutation. electromechanical energy conversion. generation of voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous generator V curve is drawn between either of these. field current on X-axis and power factor on Y-axis. field current on X-axis and armature current on Y-axis. field current on Y-axis and armature current on X-axis. either of these. field current on X-axis and power factor on Y-axis. field current on X-axis and armature current on Y-axis. field current on Y-axis and armature current on X-axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be 1.79 Ω 1.8 9 Ω 3.1 Ω 2 .1 Ω 1.79 Ω 1.8 9 Ω 3.1 Ω 2 .1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines At what power factor, the voltage regulation of a transformer can be zero ? Lagging power factor. Unity power factor. Zero power factor. Leading power factor. Lagging power factor. Unity power factor. Zero power factor. Leading power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor Remains unchanged. Increases. Oscillates around the rated speed. Decreases. Remains unchanged. Increases. Oscillates around the rated speed. Decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight 160. 170. 180. 150. 160. 170. 180. 150. ANSWER DOWNLOAD EXAMIANS APP
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