Electrical Machines Which of the following represents the pitch factor? Cos (α/2) Cos α² sin (α/2) Cos α Cos (α/2) Cos α² sin (α/2) Cos α 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 170. 160. 180. 150. 170. 160. 180. 150. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on dielectric losses. core losses. stray losses. copper losses. dielectric losses. core losses. stray losses. copper losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines With the increase in speed of a DC motor back emf falls and line current increases. back emf increases but line current falls. both back emf as well as line current increase. both back emf as well as line current fall. back emf falls and line current increases. back emf increases but line current falls. both back emf as well as line current increase. both back emf as well as line current fall. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will happen if the the supply terminals are reversed in case of a DC shunt motor? The motor will run at its normal speed in the same direction as before. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will stop. The motor will run at its normal speed in the same direction as before. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will stop. 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
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