The exhaust nozzle of a jet engine expands air at 300 kpa and 180â°c adiabatically to 100 kpa. determine: (a) the air velocity at the exit when the inlet velocity is low, and (b) the nozzle isentropic efficiency is 96 percent.

air velocity at the exit, v' = 15.3 m/s

Given:

Temperature, T =

Pressure, P = 300 kPa

Pressure, P' = 100 kPa

isentropic efficiency,

Solution:

In case of isentropic process:

Using steady flow energy eqn:

                      (1)

Now, by using eqn (1), we can calculate the isentropic kinetic energy:

where

Now,

(a) For actual kinetic energy :

Also,

             (2)

Now,

(a) air velocity at the exit, v = 0:

Using eqn (2):

v' = 15.3 m/s

the correct answer is c.stops after infancy and childhood.

myelin is the substance of the central nervous system (cns) that insulates nerve cell axons to increase the speed at which nerve impulse travels. myelination is a process of myelin formation. this process occurs postnatally, begins in the embryo during the midst of early development and finishes after birth.

answer: 500 wph.

explanation: