Recent questions tagged insulators

List the properties of line insulators in brief

Description : List the properties of line insulators in brief

Last Answer : Following are the properties of line insulators:  A) Electrical Properties of insulating material:- 1. It should have high resistance. 2. It should have high breakdown voltage. 3. It should have high ... of insulating material:- 1. It should have longer life. 2. It should have low cost

Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of flash over due to large birds (v) Maintenance/Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life

Description : Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of ... Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life 

Last Answer : S.No  Points Pin Type insulator Suspension or Disc Type insulator 1 Position of insulator on cross arm It is fixed on top of cross arm by using galvanized steel pin. So it is ... so to maintain minimum ground clearance height of pole increase.  8 Life Less More

Which have more free electrons: conductors or insulators?

Description : Which have more free electrons: conductors or insulators? 

Last Answer : Conductors have many free electrons whereas insulators have very few or none at all.

Name two good conductors, two good insulators, and two semiconductors.

Description : Name two good conductors, two good insulators, and two semiconductors.

Last Answer : In general all metals are good conductors, with silver the best and copper second.

The voltages across various discs of suspension insulators having identical discs are different due to:

Description : The voltages across various discs of suspension insulators having identical discs are different due to:  (A) Surface leakage currents  (B) Series capacitance of lines  (C) Shunt capacitance to ground  (D) Series and shunt capacitances

Last Answer : The voltages across various discs of suspension insulators having identical discs are different due to: Shunt capacitance to ground 

_______are the materials having electrical conductivity much less than most of the metals but much greater...

Description : _______are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Last Answer : Semi-conductors are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

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