Engineering Answers

Steam at a temperature of 300°C has a specific volume of 0.0976 m3/kg. Determine the pressure, specific internal energy, enthalpy, and entropy.

The simple span of 6 m W shape was used as a bridge crane runway girder. Assume that the crane wheel imparts a vertical load of 60 kN and a lateral load of 6 kN at the midspan applied at the top flange of the girder. A standard rail weighing 65 kg/m will be used. Assume that the top flange is not laterally braced between end supports.

Properties of W section:

Sx = 1280 x 10^3 mm^3 Fbx = 207 MPa

Sy = 361 x 10^3 mm^3 Fby = 238 MPa

a. Draw the loading diagram (attached in the solution set)

b. Determine the bending stress along the x-axis.

c. Determine the bending stress along the y-axis

d. Determine the ratio of the actual bending stresses to allowable bending stress.

Considering that the change in enthalpy at the first stage of a Reheat Rankine Cycle 

is 450 BTU/lb and 850 BTU/lb was recorded in the second stage, calculate for the 

thermal efficiency (in percent) of the cycle if both stages has a 93% efficiency and 

having a heat added of 9000 kJ/kg. (Hint: Neglect the pump work)

 A reheat steam cycle has 13,580 kPa of throttle pressure at the turbine inlet and a 

37.50308414 atm reheat pressure, the throttle and reheat temperature of the steam is 

1302 R, condenser pressure is 4.3 kPa, find the following:

a. Thermal Efficiency in percent

b. Heat Rejected in kJ/kg

Design a sequential circuit with two D flip-flops A and B and one input X. When X=0, the state of the circuit remains the same. When X=1, the circuit goes through the state transitions from 00 to 10 to 11 to 01, back to 00, and then repeats.

A rice hull furnace is to be designed to consume rice hull

at a rate of 5 sack/hour (10 kg/sack). If the furnace has an

outside dimension of 1 m wide x 1.5 m long x 1.2 m high,

what is the percentage heat loss by conduction from the

wall of the furnace? The wall is insulated by 8 in. thick brick

material. Inside and outside temperature are 400℃ and

40℃ , respectively.

According to the methodology of Materials Science and Engineering, a tetrahedron showing the relationship between performance, microstructure, chemistry and synthesis and processing of materials, introduce a world-class mechanical product in your country to China.

The joint p.d.f of a dimensional random variable (X,Y) is given by

f(x,y)=xy²+28, 0≤x≤2, Osys1 find (i) PX>1/Y<12 (ii) PY<12X>1.

Let X and Y be discrete random variable with probability function f (x, y)=x+y21, x=1, 2, 3 and y=1, 2. (i) Find the mean X and Y. (ii) Covariance of X, Y (iii) correlation of X and Y.

Write a report ( 5 or 6 pages).. According to the methodology of Materials Science and Engineering, a tetrahedron showing the relationship between performance, microstructure, chemistry and synthesis and processing of materials, introduce a world-class mechanical product in your country to China.