# The surge impedance of 50 miles long underground cable is 50 ohm. For a 25 miles length it will be

1.  25 ohms

2.  50 ohms

3.  100 ohms

4.   none of these

4

50 ohms

Explanation :
No Explanation available for this question

# For reducing tower footing resistance, it is better to use

1.  chemical and ground rods only

2.  chemical and counterpoise only

3.  ground rod and counterpoise only

4.  chemical, ground rods and counterpoise

4

ground rod and counterpoise only

Explanation :
No Explanation available for this question

# An RLC series circuit remains predominantly inductive

1.  at resonance frequency

2.  below resonance frequency

3.  above resonance frequency

4.   at lower half power frequency

4

above resonance frequency

Explanation :
No Explanation available for this question

# If corona loss on ;a particular-system at 50 Hz is 1 kW/phase per km, then corona loss on the same system with supply frequency 25 Hz will be

1.  1 kW/phase/km

2.  0.5 kW/phase/km

3.  0-667 kW/phase/km

4.  none of these

4

0-667 kW/phase/km

Explanation :
No Explanation available for this question

# If r is radius of the conductor and R is radius of the sheath of strength, then

1.  r/R>1.0

2.  r/R>1.0

3.  r/R

4.   r/R

4

r/R<0.368

Explanation :
No Explanation available for this question

# Three insulating materials with same maximum working stress and permittivities 2-5, 3 0, 4.0, are used in a single core cable, then location of the materials With respect to the core of the cable will be

1.  2.5, 3.0, 4.0

2.  3 0, 2.5, 4.0

3.  4.0, 3-0, 2.5

4.  40, 2.5,3.0

4

4.0, 3-0, 2.5

Explanation :
No Explanation available for this question

# If δ is the loss angle of the cable, then its power factor is

1.  sin δ

2.  cos δ

3.  independent of δ

4.   depends upon δ but it is not as per (a) and (b)

4

sin δ

Explanation :
No Explanation available for this question

# For the same voltage boost, the reactive power capacity is

1.  more for shunt capacitor

2.  more for series capacitor

3.  it is same for both series and shunt

4.  uncertain

4

more for shunt capacitor

Explanation :
No Explanation available for this question

# For effective use of a counterpoise wire

1.  its leakage resistance should be greater than the surge impedance

2.  its leakage resistance should be less than the surge impedance

3.  its leakage resistance should be equal to the surge impedance

4.  two resistance may have any relation

4

its leakage resistance should be less than the surge impedance

Explanation :
No Explanation available for this question

# For effective use of a counterpoise wire

1.  its leakage resistance should be greater than the surge impedance

2.  its leakage resistance should be less than the surge impedance

3.  its leakage resistance should be equal to the surge impedance

4.  two resistance may have any relation

4