38) A refrigerator working on a reversed Carnot cycle removes 2 kW per minute of heat from a system working between the temperatures of 300 K and 200 K. The COP and power consumed by the cycle will be

39) The Maximum Normal Stress Theory gives reasonably good predictions of the failure stress for

40) The parts of the spark ignition system are A. Carburettor B. Spark plug C. Fuel injector Which of the above are correct ?

41) Which of the following statements is/are correct about fire tube boilers ? A. The hot products of combustion pass through the tubes which are surrounded by water. B. Fire tube boilers have low initial cost. C. Fire tube boilers are more likely to explosion

42) The ratio of fibre length to its diameter in a composite material is called