A 15 kVA , 4150/240 V, single phase transformer, has a core loss at rated voltage of 120W. Its per unit reactance is 0.01 and per unit resistance is 0.06. a)What is the primary side (HV side) voltage to have 240V at secondary side (LV side) terminals when the load on the low voltage side is 12kVA at 0.8 power factor lagging b)What is the efficiency of the transformer c)At what kVA does this transformer have its maximum efficiency

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object

The maximum shear stress and maximum flexural stress occur at the same location along a beam subjected to a non-uniform bending load. a)-trune b)- false