Aluminium has a specific gravity of___________?

Related Mcqs:

1. In aluminium conductors, steel core is provided to____________?

   A. compensate for skin effect
   B. neutralise proximity effect
   C. reduce line inductance
   D. increase the tensile strength

2. In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?

   A. insulin
   B. bitumen
   C. varnish
   D. no insulation is required

3. For aluminium, as compared to copper, all the following factors have higher values except:

   A. specific volume
   B. electrical conductivity
   C. co-efficient of linear expansion
   D. resistance per unit length for same cross-section

4. The use of strain type insulators is made where the conductors are__________?

   A. dead ended
   B. at intermediate anchor towers
   C. any of the above
   D. none of the above

5. For transmission of power over a distance of 500 km, the transmission voltage should be in the range?

   A. 150 to 220 kV
   B. 100 to 120 kV
   C. 60 to 100 kV
   D. 20 to 50 kV

6. The usual spans with R.C.C. poles are_______________?

   A. 40—50 meters
   B. 60—100 meters
   C. 80—100 meters
   D. 300—500 meters

7. Which of the following are the constants of the transmission lines ?

   A. Resistance
   B. Inductance
   C. Capacitance
   D. All of the above

8. The voltage of the single phase supply to residential consumers is_____________?

   A. 110 V
   B. 210 V
   C. 230 V
   D. 400 V

9. The material commonly used for sheaths of underground cables is______________?

   A. lead
   B. rubber
   C. copper
   D. iron

10. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?

    A. 31.25 percent of copper
    B. 33.3 percent of copper
    C. 66.7 percent of copper
    D. 125 percent of copper