38) Arrange the following in steps followed in Powder metallurgy 1. Metal powdering 2. Blending 3. Compacting 4. Sintering

39) If a room is to be maintained at 200K while surroundings are 300K by a refrigeration system using reversed Carnot cycle, Coefficient of Performance (COP) will be

40) A differential manometer connected at two points shows a difference in mercury level as 10cm. The difference of pressure at the two points are: (Assume pipe is horizontal, Specific gravity of mercury is 13.6 and fluid in pipe is 0.9, g=10m/square seconds)

41) A steel rod of 1 m length has to transmit a force of 15 kN without stretching more than 1mm. E of steel is 200Gpa. Minimum cross sectional area required is

42) A thin cylindrical shell of diameter (d), length (l), and thickness (t) is subjected to an internal pressure (p). The ratio of the longitudinal strain to hoop strain is