Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? Both (A) and (B). By varying number of poles. By varying supply voltage. By varying the supply frequency. Both (A) and (B). By varying number of poles. By varying supply voltage. By varying the supply frequency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Due to magnetic saturation, the flux per pole in a DC machine without brush shift decreases in both generators and the motors with load. decreases in generators and increases in motor with load. increases in generators but decreases in motor with load. increases in both the generators and the motors with load. decreases in both generators and the motors with load. decreases in generators and increases in motor with load. increases in generators but decreases in motor with load. increases in both the generators and the motors with load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips? 0.02, 1.98 0.04, 0.96 0.02, 0.98 0.04, 1.96 0.02, 1.98 0.04, 0.96 0.02, 0.98 0.04, 1.96 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On what factors the speed of dc motor depends? All of these. Field flux. Applied voltage. Armature current Ia. All of these. Field flux. Applied voltage. Armature current Ia. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The flux involved in the emf equation of a transformer has rms value. maximum value. total value. average value. rms value. maximum value. total value. average value. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is K²R1 K×R1 R1 /K R1 /K² K²R1 K×R1 R1 /K R1 /K² ANSWER DOWNLOAD EXAMIANS APP
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