561. Which of the following materials is used for overhead transmission lines ?
A. Steel cored aluminium
B. Galvanised steel
C. Cadmium copper
D. Any of the above

562. Which of the following is not a constituent for making porcelain insulators ?
A. Quartz
B. Kaolin
C. Felspar
D. Silica

563. There is a greater possibility of occurence of corona during______________?
A. dry weather
B. winter
C. summer heat
D. humid weather
E. none of the above

564. A 3-phase 4 wire system is commonly used on________________?
A. primary transmission
B. secondary transmission
C. primary distribution
D. secondary distribution

565. The commercial sources of energy are____________?
A. solar, wind and biomass
B. fossil fuels, hydropower and nuclear energy
C. wood, animal wastes and agriculture wastes
D. none of the above

566. The percentage O2 by Weight in atmospheric air is____________?
A. 18%
B. 23%
C. 77%
D. 79%

567. The percentage 02 by volume in atmosphere air is____________?
A. 21%
B. 23%
C. 77%
D. 79%

568. The proper indication of incomplete combustion is_______________?
A. high CO content in flue gases at exit
B. high CO2 content in flue gases at exit
C. high temperature of flue gases
D. the smoking exhaust from chimney

569. The main source of production of biogas is__________________?
A. human waste
B. wet cow dung
C. wet livestock waste
D. all above

570. In fuel cell, the ___________ energy is converted into electrical energy?
A. mechanical
B. chemical
C. heat
D. sound

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