299) An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

300) The dehumidification process, on the psychrometric chart, is shown by

301) The vertical and uniformly spaced lines on a psychrometric chart indicates

302) In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = By-pass factor)

303) The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine.