Mechanical Engineering Answers

A turbojet aircraft flies at an altitude of 10000 m at a speed of 300 m/s. Compression ratio 10,

turbines inlet section is 1000°C and the mass flow rate of the air is 30 kg/s, from this engine

Calculate the maximum possible thrust. In addition, the heating value of the fuel is assumed to be 8400 kJ/kg.

fuel calculation.

Steam at 173.6 degrees celcius and with a specific entropy of 6 kJ/ kg-K undergoes a polytropic process with n= 1.18 until the pressure becomes 2 MPa. (a) What is the final temperature of the steam? (b) What is the work nonflow and steady flow of the process? (c) What is the heat transferred?

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.

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

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.

One of the wheels and leaf springs of an automobile, traveling over a rough road, is

shown in Figure 1 below. For simplicity, all the wheels can be assumed to be

identical and the system can be idealized as shown in Figure 2 below. The

automobile has a mass of m1 = 1000 kg and the leaf springs have a total stiffness of

k1 = 400kN/m. The wheels and axles have a mass of m2 =300kg and the tires have

a stiffness of k2= 500kN/m. If the road surface varies sinusoid ally with an

amplitude of Y = 0.1 and a period of l = 6m find the critical velocities of the �

answer of rod diameter,diameter pf the knuckle pin,, diameter of single eye

The design of the gear-and-shaft system depicted necessitates the use of steel shafts of the same

diameter for both AB and CD. It is also necessary that the maximum pressure be 60 MPa, and that

the angle D through which the end D of shaft CD turns not exceed 1.5°. Determine the needed shaft

diameter using G = 77.2 GPa