Electrical Machines If field current is decreased in shunt dc motor, the speed of the motor remains same. decreases. increases. None of these remains same. decreases. increases. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the function of inter pole in DC generator? To get a superior commutation. To neutralize the distortion of main field flux due to armature reaction. Both option B and C. To serve the economical aspects. To get a superior commutation. To neutralize the distortion of main field flux due to armature reaction. Both option B and C. To serve the economical aspects. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is 340 A. 570 A. 440 A. 250 A. 340 A. 570 A. 440 A. 250 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brushes of a DC machine should be placed on the commutator in the inter polar axis. commutator in the polar axis. armature in the polar axis. armature midway between poles. commutator in the inter polar axis. commutator in the polar axis. armature in the polar axis. armature midway between poles. 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 = 9.6Ω and Xq = 9Ω Xd = 10.8Ω and Xq = 8Ω Xd = 9Ω and Xq = 9.6Ω Xd = 8Ω and Xq = 10.8Ω Xd = 9.6Ω and Xq = 9Ω Xd = 10.8Ω and Xq = 8Ω Xd = 9Ω and Xq = 9.6Ω Xd = 8Ω and Xq = 10.8Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Motors for fans and pumps are selected in the rpm range 375 to 500. 1440 to 2880. 500 to 720. 720 to 920. 375 to 500. 1440 to 2880. 500 to 720. 720 to 920. ANSWER DOWNLOAD EXAMIANS APP
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