Transformers A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is 0.4 5 0.2 25 0.4 5 0.2 25 ANSWER DOWNLOAD EXAMIANS APP
Transformers The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is 8 μH 2 mH 4 μH 2 μH 8 μH 2 mH 4 μH 2 μH ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following transformer should never have the secondary open circuited while the primary is energised? Potential transformer Auto transformer Power transformer Current transformer Potential transformer Auto transformer Power transformer Current transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers To step 110 V ac down to 20 V ac, the turns ratio must be 18 0.18 0.018 5.5 18 0.18 0.018 5.5 ANSWER DOWNLOAD EXAMIANS APP
Transformers A transformer operates poorly at very low frequencies because _____ Permeability of core is increased Magnetising current is abnormally high None of the listed here Primary reactance is too much increased Permeability of core is increased Magnetising current is abnormally high None of the listed here Primary reactance is too much increased ANSWER DOWNLOAD EXAMIANS APP
Transformers The no load primary current is about ______of full load primary current. 15-30% 30-40% Above 40% 3-5% 15-30% 30-40% Above 40% 3-5% ANSWER DOWNLOAD EXAMIANS APP
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