TRANSFORMERS Find the all-day efficiency of a transformer having maximum efficiency of 98.5 per cent at 20 KVA at unity power factor and loaded as follows 11 hours: 5 kW at 0 7 power factor lagging 6 hours: 8 kW at 0.8 power factor lagging 7 hours: no load The maximum efficiency of the transformer occurs at 80 per cent of full load.​

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Apiston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kpa. heat is transferred at constant pressure until the temperature of water reaches 350 °c. determine (a) the quality of water at the initial state (b) the work associated with this process, (c) the heat associated with this process.

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces.a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.