A60-hz single-phase transformer with capacity of 150 kva has the following parameters: rp = 0.35 ω rs = 0.002 ω rc = 5.2 kω xp = 0.5 ω xs = 0.008 ω xm = 1.1 kω the primary transformer voltage is 2.8 kv and the secondary is 230 v. the transformer is connected to a variable load (0 to 300 kw) with a lagging power factor of 0.83 and a load voltage equal to the rated transformer secondary. determine: (a) the total input impedance of the transformer when the secondary is shorted; and (b) the input current, voltage, power and power factor at full load (150 kw). (c) plot the voltage regulation versus load, and determine the load that produces 5% regulation.

We want to calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. the air temperature is 20 oc, canary’s body internal and surface temperature is 33oc, external body surface convective heat transfer coefficient is 25.2 w/m2 .k, temperature difference between the inhaled and exhaled air is 4.3 oc, the ventilation rate is 0.74 cc of air per second, specific heat of air is 1.0066 kj/kg. k and density of air is 1.16 kg/m3 . assume the canary’s body to be a cylinder with 7 cm diameter and 9 cm length, and heat exchange is from the side as well as the top and bottom of cylinder. calculate 1) the net rate of heat lost by radiation, assuming heat gained by the bird through radiation from the surroundings is 11.5 w; 2) rate of heat transferred by convection to the surrounding air; 3) rate of heat transferred in the exhaling air without considering any internal evaporation; 4) total metabolic power.

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.