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MMLU-Pro / 11833 / A two-winding transformer is rated 2.2 kva, 220/110 volts, 60 cycles per second.…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A two-winding transformer is rated 2.2 kva, 220/110 volts, 60 cycles per second. Winding A is the 220-volt winding and has an impedance of 0.24 + j0.40 ohms. Winding B is the 110-volt winding and has an impedance of 0.05 + j0.09 ohms. The core loss is 28 watts for rated voltage and frequency. The transformer is connected as an autotransformer to supply a load at 220 volts from a source of 330 volts. For a load current of 30 amp at 0.9 pf lagging, find: (a) the voltage regulation; (b) the efficiency.

category

engineering

options

  1. (a) 0.019, (b) 0.987
  2. (a) 0.009, (b) 0.981
  3. (a) 0.020, (b) 0.985
  4. (a) 0.015, (b) 0.982
  5. (a) 0.013, (b) 0.990
  6. (a) 0.012, (b) 0.986
  7. (a) 0.010, (b) 0.989
  8. (a) 0.017, (b) 0.983
  9. (a) 0.008, (b) 0.980
  10. (a) 0.011, (b) 0.988

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11833
task_id
8b02b59a-23a3-5d55-9a3c-7048781c502f
task_key
default--test--11833
task_revision_id
1
config / split
default / test

Official source

initial import