Q31. The string efficiency of a string of suspension insulators is dependent on

Q32. For a 1 cm. gap in air at 760 mm. pressure and 20°C temperature the breakdown voltage is

Q33. The chances of corona are maximum during__________.

Q34. At normal atmospheric conditions breakdown strength of air is

Q35. A 132 kV transmission line has the following data: Weight of conductor = 700 kg/km; Length of span = 250 m; Ultimate strength = 4375 kg; Safety factor = 2. Calculate the height above ground at which the conductor should be supported. (Ground clearance required is 10 m.)

Q36. The distance between two poles in called

Q37. The effect of increase of temperature on overhead lines is to

Q38. The major criteria for selection of size of distributor for a radial distribution system is

Q39. In primary distribution lines, the earth wire is placed

Q40. Generation and distribution of power in EHV lines is