Engineering Answers

name atleast 5 construction activities in a built environment. classify these activities. how do these activities contribute to the society's well-being?

Think 5 ways in (flood defenses,drainage, and transport network) which it impacts on your daily life.

1. Name atleast two major environmental problems we are facing in our country as of present. As a future engineer, what are the possible recommendations you cn provide to mitigate these problems?

2. list atleast 3 aspects of natural world that environmental engineers should work to care for or restore, then provide a brief description and discussion for each aspect.

discuss the functions of civil engineering, environmental engineering nd environmental science. and give their relation to each other.

Write atleast 5 different infrastrustures under the domain of the following specialization of Civil Engineering.

*structural engineering

*water resource engineering

*transportation engineering

explain the working principle and operation of BLDC motor

Determine the center of gravity and area moment of inertia about centroidal axes of shaded area as shown in Figure 1

One kg of fluid enters the steady flow apparatus at a pressure of P1, velocity 16m/s and

specific volume 0.4 m3/kg. The Inlet is 30 m above the ground level. The fluid leaves the

apparatus at Pressure of P2, velocity of 275 m/s and specific volume 0.6 m3/kg. The outlet is

at the ground level. The total heat loss between the inlet and outlet is 10 KJ/kg of fluid. If 140

KJ/kg of work is done by the system, find the change in specific internal energy and indicate

whether this is a increase or decrease.

P1 = 6 Bar − {

√X5

849 } Pa ; P2 = 1 Bar + {+√99 − X

4

}Pa

x= 51

Using powers of 10, estimate the number of quantum states accessible to an outer electron on an atom, by estimating the size of an atom and knowing that typical binding energies are a few eV. (That is, if the kinetic energy is greater than a few eV then the electron is no longer on the atom.) The number of states = VrVp/h3.) 

White dwarf stars are essentially plasmas of free electrons and free protons

(hydrogen atoms that have been stripped of their electrons). Their densities

are typically 5 × 10^9 kg/m3 (i.e., 10^6 times the average density of Earth).

Their further collapse is prevented by the fact that the electrons are highly

degenerate, that is, all the low-lying states are filled and no two identical

electrons can be forced into the same state.

(a) Estimate the temperature of this system. (Assume nonrelativistic electrons and that p2

f /2m = (3/2)kT .)

(b) Now suppose that the gravity is so strong that the electrons are forced

to combine with the protons, forming neutrons (with the release of a

neutrino). If the temperature remains the same, what would be the density

of this degenerate neutron star?