Transformers Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is great than one None of these less than one approximately equal to one great than one None of these less than one approximately equal to one ANSWER DOWNLOAD EXAMIANS APP
Transformers Which of the following transformer should never have the secondary open circuited while the primary is energised? Auto transformer Power transformer Current transformer Potential transformer Auto transformer Power transformer Current transformer Potential transformer ANSWER DOWNLOAD EXAMIANS APP
Transformers What is the approximate efficiency of large transformers? 65% 75% 95 % 85% 65% 75% 95 % 85% ANSWER DOWNLOAD EXAMIANS APP
Transformers Material used for construction of transformer core is usually Aluminium Wood Copper Silicon steel Aluminium Wood Copper Silicon steel ANSWER DOWNLOAD EXAMIANS APP
Transformers The leakage flux in a transformer depends upon load current load current, voltage, frequency and power factor load current, voltage and frequency load current and voltage load current load current, voltage, frequency and power factor load current, voltage and frequency load current and voltage ANSWER DOWNLOAD EXAMIANS APP
Transformers When secondary of a current transformer is open-circuited its iron core will be cool as there is no secondary current none of above will happen hot because of heavy iron losses taking place in it due to high flux density hot because primary will carry heavy current cool as there is no secondary current none of above will happen hot because of heavy iron losses taking place in it due to high flux density hot because primary will carry heavy current ANSWER DOWNLOAD EXAMIANS APP
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