A 15 KVA, 2300/230 V transformer, has been tested and found the compone from open circuit test
Rc, s=10500
Xm, s = 1100
from short circuit test
Req, p=4.450
Xeq, p=6.450
The efficiency at the 80% of the full load, power factor 0.8 lagging will be

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented