An item has constant failure rate 0.0005 hr. when the item fails, it is repaired to an "as good as new" condition. the associated mean downtime is 6 item is supposed to be in (a) find the average availability aav of the item. (b) how many hours per year will the item on average be out of operation?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature