Technical Questions asked in ABB

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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

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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
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
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
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

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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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