Electrical Machines The material used for commutator brushes is mostly copper. cast iron. mica. carbon. copper. cast iron. mica. carbon. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value? 0.4 0.04 0.2 0.02 0.4 0.04 0.2 0.02 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve reduced size. quick acceleration. low starting torque. high efficiency. reduced size. quick acceleration. low starting torque. high efficiency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Capacitor start capacitor run provides high staring torque and high power factor. high power factor only. high staring torque only. none. high staring torque and high power factor. high power factor only. high staring torque only. none. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In Ward-Leonard system, the lower limit of the speed imposed by None of above. Residual magnetism of the generator. Armature resistance. Field resistance. None of above. Residual magnetism of the generator. Armature resistance. Field resistance. 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 3.1 Ω 1.8 9 Ω 2 .1 Ω 1.79 Ω 3.1 Ω 1.8 9 Ω 2 .1 Ω ANSWER DOWNLOAD EXAMIANS APP
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