Question: Natural oil cooling is used for transformers up to a rating of____________?

• 1. 3000 kVA
• 2. 1000 kVA
• 3. 500 kVA
• 4. 250 kVA

Question: In the transformer the function of a conservator is to_______________?

• 1. provide fresh air for cooling the transformer
• 2. supply cooling oil to transformer in time of need
• 3. protect the transformer from damage when oil expends due to heating
• 4. none of the above

Question: The no load current in a transformer lags behind the applied voltage by an angle of about_____________?

• 1. 180°
• 2. 120″
• 3. 90°
• 4. 75°

Question: A common method of cooling a power transformer is_______________?

• 1. natural air cooling
• 2. air blast cooling
• 3. oil cooling
• 4. any of the above

Question: In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?

• 1. friction and windage losses
• 2. copper losses
• 3. hysteresis and eddy current losses
• 4. none of the above

Question: Which winding in a transformer has more number of turns ?

• 1. Low voltage winding
• 2. High voltage winding
• 3. Primary winding
• 4. Secondary winding

Question: Primary winding of a transformer________________?

• 1. is always a low voltage winding
• 2. is always a high voltage winding
• 3. could either be a low voltage or high voltage winding
• 4. none of the above

Question: A transformer cannot raise or lower the voltage of a D.C. supply because_______________?

• 1. there is no need to change the DC voltage
• 2. a DC circuit has more losses
• 3. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
• 4. none of the above

Question: A transformer transforms__________________?

• 1. voltage
• 2. current
• 3. power
• 4. frequency

Question: In the transformer following winding has got more cross-sectional area______________?

• 1. Low voltage winding
• 2. High voltage winding
• 3. Primary winding
• 4. Secondary winding