Skin Effect MCQ & Proximity Effect MCQ

1. At power frequencies, skin and proximity effects are ________ frequency.

1. independent of
2. negligible at small
3. important at small
4. negligible at large

2. Which of the following is an effect of non-uniform current distribution in a conductor?

1. Ferranti effect
2. skin effect
3. proximity effect
4. skin effect or proximity effect

3. The AC resistance of the conductor is more than DC resistance, due to

1. Ferranti effect
2. skin effect
3. both a and b
4. none of these

4. Which of the following effect represents in resistance due to non-uniform distribution of current in a conductor?

1. Ferranti effect
2. skin effect
3. corona effect
4. both a and b

5. The effective resistance of a coil at high frequencies is more than its d.c. resistance on account of

1. Ferranti effect
2. skin effect
3. eddy current losses
4. all of these

6. Skin effect is only noticeable at ______ frequencies.

1. audio
2. low
3. high
4. all

7. If supply frequency increases, the skin effect is

1. decreased
2. increased
3. remains same
4. none of these

8. Skin effect exists only in

1. low voltage dc overhead transmission
2. high voltage dc overhead transmission
3. cable carrying dc current
4. AC transmission

9. The skin effect of the conductor increases the effective value of

1. inductance of the conductor
2. resistance of the conductor
3. capacitance of the conductor
4. none of these

10. Stranded wires are mainly used to

1. reduce skin effect
2. reduce metal fatigue
3. reduce proximity effect
4. both b and c

11. Skin effect results

1. resistance in ac > resistance in dc
2. resistance in ac = resistance in dc
3. resistance in ac < resistance in dc
4. none of these