Technical Questions asked in ABB

  1. Which of the following is not the disadvantage of lower power factor?
    1. Larger copper losses
    2. Greater conductor size
    3. Voltage regulation
    4. lesser kVA rating
    Answer: Option D
  1. The ratio of resistances of a 110 W, 220 V lamp to that of a 55 W, 110 V lamp will be at the respective voltages
    1. 1
    2. 2
    3. 4
    4. 8
    Answer: Option B
  2. A power supply having output resistance 1.5Ω supplies a full load current of 500mA to a 10Ω load. Determine percent voltage regulation of the supply.
    1. 15%
    2. 20%
    3. 45%
    4. 80%
    Answer: Option A
  3. The rms value of the voltage V(t) =3 + 4 cos (3f) is
    1. √ 17V
    2. 5V
    3. 3. 7 V
    4. (3 + 2 √ 2) V
    Answer: Option A
  4. The passive 2-port network is in a steady state. Compared to its input, the steady state output can never offer
    1. higher voltage
    2. lower impedance
    3. greater power
    4. better regulation
    Answer: Option C
  1. An electric motor with 'constant output power' will have a torque-speed characteristic in the form o a
    1. straight line through a origin
    2. straight line parallel to speed axis
    3. circle about origin
    4. rectangular hyperbola
    Answer: Option D

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