Questions and Answers
A single phase transformer is wound with 200 turns on the primary and 60 turns on the secondary. The maximum of core flux is 12.5mWb and the frequency is 50Hz determine the - primary and Secondary voltage.
555v and 166.5V
A single phase transformer is wound with 750 turns on the primary and 100 turns on the secondary. Determine the primary voltage of the secondary voltage is 32v.
240v
A 240/20v single phase transformer has 480 turns on the primary. Determine the required number of turns on the secondary.
40
A single phase transformer has 500 turns on the primary and 250 turns on the secondary. If th primary is 5A, determine the value of the secondary current.
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What is the secondary current
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What is the transformation ratio
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What is the primary voltage
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What is the primary current
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A single phase 1000/250V, Transformer is rated at 10kVA. Determine the full load secondary current.
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A three phase, 11,000/415 transformer is rated at 500kVA. Determine the full load secondary current.
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The 42/52V single phase transformer used in the practical assignments of this module are rated at 100VA. Determine the full load secondary current, given the transformers are designed to deliver 24V at 50Hz
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Determine the full load secondary current of the 33/11kV, 1,000kVA 3 phase transformer.
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A 240/32V single phase transformer takes a no load current of 0.8A at a power factor of 0.1 lag. Determine the primary current and power factor of the transformer supplies a load current of 35A at unity power factor
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A 240/110V single phase transformer takes a no load current of 2A at a power factor of 0.9 lag. Determine the primary current and power factor if the transformer supplies a load current of 15A at power factor of 0.85 lag
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The open circuit secondary voltage of a transformer is 250V and at full load the voltage drops to 244.5V. Determine the percentage regulation.
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A step down transformer with an open circuit ratio of 6600/415V has a regulation of 3.14% at full load. What is the secondary terminal voltage of the transformer at this load?
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A 5MVA, 33/11kV transformer is tested with the secondary short circuited. A voltage of 1.65kV is required to cause full load current to flow. Determine the transformer (a) rated primary current. (b) Impedance (c) percentage Impedance
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A three phase 11kV/430V delta/star transformer is rated at 450kVA and has a Z% of 5% (a) find the rated secondary line current. (b) Find the prospective short circuit current of the transformer.
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A three phase distribution transformer supplies 675kW at full load. If the input power to the transformer at this load is 695kW, determine the efficiency of the transformer.
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