Three Phase Induction Motors The speed of a squirrel-cage induction motor can be controlled by all of the following except Changing winding resistance Changing number of poles Reducing supply voltage Changing supply frequency Changing winding resistance Changing number of poles Reducing supply voltage Changing supply frequency ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The frame of an induction motor is usually made of Cast iron Silicon steel Aluminium Bronze Cast iron Silicon steel Aluminium Bronze ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors If the rotor slots are made deeper, rotor resistance is ______ Decreased at starting Increased under running conditions Increased at starting None of the listed here Decreased at starting Increased under running conditions Increased at starting None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors Very large 3-phase induction motors (greater than 25 HP) are started _____ By auto transformer starting Direct on line None of the listed here Star-delta starting By auto transformer starting Direct on line None of the listed here Star-delta starting ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______ None of the listed here 1-S 1+S S-1 None of the listed here 1-S 1+S S-1 ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor with 1000 r.p.m. speed will have 6 poles 2 poles 4 poles 8 poles 6 poles 2 poles 4 poles 8 poles ANSWER DOWNLOAD EXAMIANS APP
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