Three Phase Induction Motors The speed of a squirrel-cage induction motor can be controlled by all of the following except Changing winding resistance Reducing supply voltage Changing supply frequency Changing number of poles Changing winding resistance Reducing supply voltage Changing supply frequency Changing number of poles ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors If the rotor slots are made deeper, rotor resistance is ______ Increased under running conditions Decreased at starting None of the listed here Increased at starting Increased under running conditions Decreased at starting None of the listed here Increased at starting ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors A 3 phase induction motor is ________ Very costly Not easily maintainable Essentially a constant speed motor A variable speed motor Very costly Not easily maintainable Essentially a constant speed motor A variable speed motor ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The reactance of the rotor circuit of a 3-phase induction motor is maximum at Half full load No load Starting Full load Half full load No load Starting Full load ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current. 15 to 20 % 30 to 50% 5% 10 to 15% 15 to 20 % 30 to 50% 5% 10 to 15% ANSWER DOWNLOAD EXAMIANS APP
Three Phase Induction Motors An induction motor is Self starting with high torque Self starting with zero torque Self starting with low torque Non self starting Self starting with high torque Self starting with zero torque Self starting with low torque Non self starting ANSWER DOWNLOAD EXAMIANS APP
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