Question: The energy radiated by sun on a bright sunny day is approximately______________?

• 1. 700 W/m2
• 2. 800 W/m2
• 3. 1 kW/m2
• 4. 2 kW/m2

Question: Solar thermal power generation can be achieved by_______________?

• 1. using focusing collector or heliostates
• 2. using flat plate collectors
• 3. using a solar pond
• 4. any of the above system

Question: In fuel cell, the ___________ energy is converted into electrical energy?

• 1. mechanical
• 2. chemical
• 3. heat
• 4. sound

Question: The main source of production of biogas is__________________?

• 1. human waste
• 2. wet cow dung
• 3. wet livestock waste
• 4. all above

Question: The proper indication of incomplete combustion is_______________?

• 1. high CO content in flue gases at exit
• 2. high CO2 content in flue gases at exit
• 3. high temperature of flue gases
• 4. the smoking exhaust from chimney

Question: The percentage 02 by volume in atmosphere air is____________?

• 1. 21%
• 2. 23%
• 3. 77%
• 4. 79%

Question: The percentage O2 by Weight in atmospheric air is____________?

• 1. 18%
• 2. 23%
• 3. 77%
• 4. 79%

Question: The commercial sources of energy are____________?

• 1. solar, wind and biomass
• 2. fossil fuels, hydropower and nuclear energy
• 3. wood, animal wastes and agriculture wastes
• 4. none of the above

Question: Due to which of the following reasons the cables should not be operated too hot ?

• 1. The oil may loose its viscosity and it may start drawing off from higher levels
• 2. Expansion of the oil may cause the sheath to burst
• 3. Unequal expansion may create voids in the insulation which will lead to ionization
• 4. All of the above

Question: The load voltage is approximately constant when a Zener diode is ________________?

• 1. Forward biased
• 2. Unbiased
• 3. Reverse biased
• 4. Operating in the breakdown region