46) Find the melting efficiency for an arc welding process which has a potential of 15 volts and current rating of 250 ampares. Weld has travel speed of 6 mm/s for a cross sectional area of 18 square millimeter. Heat transfer efficiency is 0.80 and heat requir

47) During expansion in steam turbine, entropy

48) If the strain energy absorbed in a cantilever beam in bending under its own weight is 'K' times greater than the strain energy absorbed in an identical simply supported beam in bending under its own weight, then the magnitude of 'K' is

49) In a 5 KW cooling capacity refrigeration system operating on a simple vapour compression cycle, the refrigerant enters the evaporator with an enthalpy of 75 KJ/kg and leaves with an enthalpy of 182 KJ/kg. The enthalpy of the refrigerant after compression i

50) A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30 m at a flow rate of 60 litres/min. If the rpm is changed to 1000, then the head H in meters and flow rate Q in liters/min at maximum efficiency are estimated to