62) _____ is a drop hammer used in forging

63) A drop hammer is used to forge a steel rod. If the energy transferred is 7500 Joules and the downward force exerted by the hammer is 15 tons, the distance the hammer travelled after striking is _____ mm

64) The process of increasing the diameter of a ring by forging is called

65) The accuracy of micrometer and caliper are checked by

66) Ram drives his car at a speed of 50 km/hr for 6 hours and 37.5 km/hr for next 4 hours. What is his average speed?