It is required to design a zener shunt regulator to provide a regulated voltage of about 10 v. the available 10-v, 1-w zener of type 1n4740 is specified to have a 10-v drop at a test current of 25 ma. at this current, its rz is 7 . the raw supply, vs , available has a nominal value of 20 v but can vary by as much as ±25%. the regulator is required to supply a load current of 0 ma to 20 ma. design for a minimum zener current of 5 ma.

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

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.

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.