Suppose that an ideal gas diesel engine comprises the following four processes: 1-2: polytropic compression with n = 9/7, p1 = 1.5 bar, p2 = 53 bar, v1/v2 = 16, v1 – v2 = 14 l 2-3: isobaric expansion, v3/v2 = 2.795 3-4: polytropic expansion with n = 9/7 4-1: isometric heat output (a) determine the unknown state variables, v1, v2, v3, v4, p3, and p4, (b) plot the p-v diagram on the axes provided. clearly label each state on the plot and clearly draw the path between each state.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.

Which of the following is the most important advantage of a large field of view? a. allows larger areas to be examined b. relieves eyestrain c. minimizes parallax errors. d. increases precision in proportion to the in- crease in field of view

Assume that you are asked to perform a boring operation on a large-diameter hollow workpiece. would you use a horizontal or a vertical boring mill?