70) In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become

74) The stress induced in a body, when suddenly loaded, is _____ the stress induced when the same load is applied gradually

75) When two links are connected by a pin joint, their instantaneous centre lies

76) When the gas is cooled at constant pressure

77) A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviations 1, 2 and 2 respectively. The probability that the project will be completed in 20 days is