Transformers The permissible flux density in case of cold rolled grain oriented steel is around 1.7 Wb/m² 4.7 Wb/m² 2.7 Wb/m² 3.7 Wb/m² 1.7 Wb/m² 4.7 Wb/m² 2.7 Wb/m² 3.7 Wb/m² ANSWER DOWNLOAD EXAMIANS APP
Transformers What is the approximate efficiency of large transformers? 85% 95 % 75% 65% 85% 95 % 75% 65% ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following is the main advantage of an auto-transformer over a two winding transformer? Hysteresis losses are reduced Copper losses are negligible Eddy losses are totally eliminated Saving in winding material Hysteresis losses are reduced Copper losses are negligible Eddy losses are totally eliminated Saving in winding material ANSWER DOWNLOAD EXAMIANS APP
Transformers Which type of winding is used in 3phase shell-type transformer? Rectangular type Cylindrical type Circular type Sandwich type Rectangular type Cylindrical type Circular type Sandwich type ANSWER DOWNLOAD EXAMIANS APP
Transformers The output current corresponding to the maximum efficiency for a transformer having core loss of 200 W and equivalent resistance referred to secondary of 0.5 Ω is 20 A 5 A 10 A 15 A 20 A 5 A 10 A 15 A ANSWER DOWNLOAD EXAMIANS APP
Transformers The main reason for generation of harmonics in a transformer could be mechanical vibrations saturation of core poor insulation fluctuating load mechanical vibrations saturation of core poor insulation fluctuating load ANSWER DOWNLOAD EXAMIANS APP
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