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

43) If the mechanical properties of a composite improves as a result of increasing the average fibre length, then it is called

44) According to Gibb's phase rule, the number of component phases and number of degrees of freedom in a system at equilibrium is given by where, P = number of phases, F = number of degrees of freedom, C = number of components in a system in equilibrium.