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

Question: While conducting short-circuit test on a transformer the following side is short circuited?

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

Question: Which of the following is not a part of transformer installation ?

• 1. Conservator
• 2. Breather
• 3. Buchholz relay
• 4. Exciter

Question: The purpose of providing an iron core in a transformer is to_____________?

• 1. provide support to windings
• 2. reduce hysteresis loss
• 3. decrease the reluctance of the magnetic path
• 4. reduce eddy current losses

Question: No-load current in a transformer________________?

• 1. lags behind the voltage by about 75°
• 2. leads the voltage by about 75°
• 3. lags behind the voltage by about 15°
• 4. leads the voltage by about 15°

Question: The efficiency of a transformer will be maximum when_____________?

• 1. copper losses = hysteresis losses
• 2. hysteresis losses = eddy current losses
• 3. eddy current losses = copper losses
• 4. copper losses = iron losses