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1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 5 per cent d) 20 to 30 per cent c) 0.5, d) 0.35 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, 3- The efficiency of a transformer will be maximum when a) copper losses = hysteresis losses c) copper losses = iron losses b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side c) High voltage side d) Primary side

1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 5 per cent d) 20 to 30 per cent c) 0.5, d) 0.35 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, 3- The efficiency of a transformer will be maximum when a) copper losses = hysteresis losses c) copper losses = iron losses b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side c) High voltage side d) Primary side

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 per cent d) 20 to 30 per cent 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, c) 0.5, 3- The efficiency of a transformer will be maximum when a) copper losses hysteresis losses c) copper losses = iron losses d) 0.35 b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side 6- The core loss of a transformer depends upon : a) the frequency and the maximum flux density c) rated current c) High voltage side d) Primary side b) Induced Voltage d) rated voltage 7- The no load current in a transformer lags behind the applied voltage by an angle of about a) 120 degree b) 75 degree c) 45 degree d)180 degree 8- The hysteresis loss in a transformer is 500 watts at 50 Hz. Its loss at 80 Hz will be a) 312.5 watts b) 500 watts c) 200 watts 9- Power transformers are designed to have maximum efficiency at d) 800 watts a) nearly full load b) 70% full load c) 50% full load d) no load 10- A transformer operates maximum efficiently at 3/4th full load. Its iron (Pi) and copper loss (Pcu) are related as: a) Pi 1.778 Pcu b) Pi 1.333 Pcu c) Pi=0.75 Pcu d) Pi=0.5625 Pcu
Transcribed Image Text:1- The no-load current drawn by transformer is usually, the per cent of the full-load current is a) 0.2 to 5 per cent b) 2 to 5 per cent c) 12 to 15 per cent d) 20 to 30 per cent 2- The power factor of a transformer on no load will be about a) unity, b) 0.75, c) 0.5, 3- The efficiency of a transformer will be maximum when a) copper losses hysteresis losses c) copper losses = iron losses d) 0.35 b) eddy current losses = copper losses d) hysteresis losses = eddy current losses 4-During the short circuit test, the core losses are negligible. This is because a) The voltage applied across the high voltage side is a fraction of its rated voltage b) The current on the low voltage side is very small. c) The power factor is high d) iron becomes fully saturated 5-While conducting short-circuit test on a transformer, the following side is short circuited a) Secondary side, b) Low voltage side 6- The core loss of a transformer depends upon : a) the frequency and the maximum flux density c) rated current c) High voltage side d) Primary side b) Induced Voltage d) rated voltage 7- The no load current in a transformer lags behind the applied voltage by an angle of about a) 120 degree b) 75 degree c) 45 degree d)180 degree 8- The hysteresis loss in a transformer is 500 watts at 50 Hz. Its loss at 80 Hz will be a) 312.5 watts b) 500 watts c) 200 watts 9- Power transformers are designed to have maximum efficiency at d) 800 watts a) nearly full load b) 70% full load c) 50% full load d) no load 10- A transformer operates maximum efficiently at 3/4th full load. Its iron (Pi) and copper loss (Pcu) are related as: a) Pi 1.778 Pcu b) Pi 1.333 Pcu c) Pi=0.75 Pcu d) Pi=0.5625 Pcu
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