Question 43 In a hydro-electric plant, spillways are used: a. b. None of the above C. Question 44 d. to discharge surplus water on the downstream side of dam Water is not available in sufficient quantity Running cost of a hydro-electric power plant is: Y b. to discharge all surplus water a. Equal to running cost of a steam power plant Less than running cost of a steam power plant More than running cost of a steam powl plant None of the above C. d. a. Question 45 The efficiency of the solar cell is about: a. 60% b. 25% C. 15% d. 40% Question 46 What is the maximum possible output of a solar array? a b C d. 300 W m 250 W m 500 W m 100 W m ion 47 The function of a solar collector is of converting solar energy into a. Electrical energy directions. b. Thermal energy. C. d. estion 48 In a solar collector, what does the transparent cover provide for? b. All of these. a. All of the above C Radiations d Transmit solar radiation only Reduce the heat losses from collector beneath to atmosphere. L Protect the collector from dust. tion 49 What is the working fluid in closed cycle a magneto hydrodynamic (MHD) system? a. Coal b. Potassium c. Natural gas d. Helium and argon stion 50 Tidal energy development needs a. Low capacity and long construction time. .b. Huge capacity and long construction time. Low capacity and low construction time. C. Huge capacity and low construction time. d.