Question: Spacers are provided between adjacent coils?

• 1. to provide free passage to the cooling oil
• 2. to insulate the coils from each other
• 3. both A and B
• 4. none of the above

Question: No-load current of a transformer has_____________?

• 1. has high magnitude and low power factor
• 2. has high magnitude and high power factor
• 3. has small magnitude and high power factor
• 4. has small magnitude and low power factor

Question: Transformer breaths in when_______________?

• 1. load on it increases
• 2. load on it decreases
• 3. load remains constant
• 4. none of the above

Question: The maximum efficiency of a distribution transformer is____________?

• 1. at no load
• 2. at 50% full load
• 3. at 80% full load
• 4. at full load

Question: Power transformers are designed to have maximum efficiency at___________?

• 1. nearly full load
• 2. 70% full load
• 3. 50% full load
• 4. no load

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