Electrical Machines What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field? Zero Slip speed None of these Synchronous speed Zero Slip speed None of these Synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machine armature windings are placed on rotor because of the necessity for development of torque. electromechanical energy conversion. commutation. generation of voltage. development of torque. electromechanical energy conversion. commutation. generation of voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is 15.1 Ω 15.9 Ω 31.1 Ω 31.9 Ω 15.1 Ω 15.9 Ω 31.1 Ω 31.9 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be Xd = 8Ω and Xq = 10.8Ω Xd = 9Ω and Xq = 9.6Ω Xd = 9.6Ω and Xq = 9Ω Xd = 10.8Ω and Xq = 8Ω Xd = 8Ω and Xq = 10.8Ω Xd = 9Ω and Xq = 9.6Ω Xd = 9.6Ω and Xq = 9Ω Xd = 10.8Ω and Xq = 8Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ slip ring motor has double cage rotor. short-circuited rotor. wound rotor. any of the above. double cage rotor. short-circuited rotor. wound rotor. any of the above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dummy coils are used for mechanical balancing. reducing armature reaction. All of these increasing efficiency. mechanical balancing. reducing armature reaction. All of these increasing efficiency. ANSWER DOWNLOAD EXAMIANS APP
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