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MMLU-Pro / 11602 / 2,300-volt 60-cycle power transformer. r_1 = 1.28 ohmsr_2 = 0.0467 ohm x_1= 4.24…

Problem

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question

2,300-volt 60-cycle power transformer. r_1 = 1.28 ohmsr_2 = 0.0467 ohm x_1= 4.24 ohmsx_2 = 0.162 ohm When this transformer is operated at no load, with 2,300 volts at 60 cycles impressed on its low-voltage winding, the current and power are I_n = 3.57 amp and P_n= 2,140 watts. When the high-voltage winding is short-circuitedand 48.4 volts at 60 cycles are impressed on thelow- voltage winding, the input current and power are I_SC = 132.6 amp and P_SC = 1,934 watts. The d-c resistances r_1and r_2 were measured at a temperature of 25°C and the temperatureduring the short-circuit test was also 25°C. Calculate the efficiency for a fullkva, 0.8 power-factor load.

category

engineering

options

  1. 97.8 per cent
  2. 99.5 per cent
  3. 96.7 per cent
  4. 95.0 per cent
  5. 95.5 per cent
  6. 99.1 per cent
  7. 94.8 per cent
  8. 97.3 per cent
  9. 93.2 per cent
  10. 98.2 per cent

src

stemez-ElectricalMachines

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Source and history

upstream_id / Original problem ID
11602
task_id
1b3c1f86-5e49-53fd-8dbb-fbc21bc7542b
task_key
default--test--11602
task_revision_id
1
config / split
default / test

Official source

initial import