A500mva, 220kv/24kv, three phase y-δ transformer has an equivalent series impedance of 1 + j5 ω per phase referred to the high-voltage side. the transformer is supplying a three phase load of 500mva, 0.85 power factor lagging at a terminal voltage of 24 kv (line to line) on its low-voltage side. the primary is supplied from a feeder with an impedance of 0.5+ j1 ω per phase. determine the line-neutral voltage in kv across the load when it is referred to the transformer high side voltage.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79