A beam of steel having square cross section of 20x20mm2
having E =
200 GPa is subjected to an axial (P) load of 20 kN, Torsional (T)
load
of 60 Nm and Transverse (F) load of 0.60 kN as shown in Figure.
Solve
each load independently for both element A and B existing at the
top
and side surface of the beam respectively and determine:
a) State of stress against each load condition for both element
A
and B
b) Draw Mohr’s Circle where applicable for each state of stress
for
both element A and B
c) Determine the principal planes and the principal stresses,
d) Draw the orientation of the Principal Stresses
e) The stress components exerted on the element obtained by
rotating the given element counterclockwise through 30
degrees.
In: Mechanical Engineering
3. Define critical pressure & discharge pressure for long Laval nozzle convergent-divergent. and What are the practical applications of the long Laval nozzle convergent-divergent
In: Mechanical Engineering
Q4 (a): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 33.77 , wire diameter 5 , and the number of active coils 22. Assume no set removal.
a) Calculate the torsional yield strength, of the spring wire (in units). Enter only numeric value upto four places of decimal without units.
(b): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 34.93 , wire diameter 5.87 , and the number of active coils 20. Assume no set removal.
Calculate the static load, (in units) corresponding to torsional yield strength, of the spring wire. Enter only numeric value upto four places of decimal without units.
(c): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 25.5 , wire diameter 4.61 , and the number of active coils 23. Assume no set removal.
Calculate the spring scale, (in units). Enter only numeric value upto four places of decimal without units.
(d): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 25.21 , wire diameter 5.91 , and the number of active coils 20. Assume no set removal.
Calculate the deflection, (in units) that would be caused by load of part corresponding to . Enter only numeric value upto 4 places of decimal without units.
(e): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 34.76 , wire diameter 5.44 , and the number of active coils 20. Assume no set removal.
Calculate the solid length, (in units). Enter only numeric value.
(f): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 27.96 , wire diameter 4.89 , and the number of active coils 21. Assume no set removal.
Calculate the free length, (in units). Enter only numeric value upto 4 places of decimal without units.
(g): A helical compression spring made of music wire (ends are squared and ground) has mean coil diameter 34.27 , wire diameter 4.99 , and the number of active coils 23. Assume no set removal.
Calculate the pitch, (in units). Enter only numeric value upto four places of decimal without units.
In: Mechanical Engineering
Consider a steam power plant that operates on a regenerative Rankine cycle and has a net power output of 150 MW. Steam enters the turbine at 10 MPa and 500°C and the condenser at 10 kPa. The isentropic efficiency of the turbine is 80 percent, and that of the pumps is 95 percent. Steam is extracted from the turbine at 0.5 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the mass flow rate of steam through the boiler, and (b) the thermal efficiency of the cycle. Also, determine the exergy destruction associated with the regeneration process. Assume a source temperature of 1300 K and a sink temperature of 303 K.
In: Mechanical Engineering
3-) A heat exchanger with 1 body - 4 pipe passages and each pipe (100+ ??) (with a diameter of 2.6 cm each, 4 m long thin wall per pass) will be used to heat the air. Water enters the pipes with a mass flow of 8 kg / s at 350 K temperature, and air enters the body at a temperature of 15 C with a mass flow of 18 kg / s. The pollution factor of the sediment formed inside the pipe over time is 0.0026 m'K / W. Transport coefficients on the inner and outer surfaces of the pipes are estimated at 450 and 200 W / m'K, respectively. Using specific temperatures at 25 ° C for air and water (?? = school no. Last two digits, for example 0611002072; ?? = 72, ie 172 units), a-) the efficiency of the heat exchanger by drawing the shape of the problem, b-) Heat transfer rate ( kW), c-) Calculate the outlet temperatures (C) of the water and air and show the temperatures in the T_L diagram.
28 will be written instead of a question mark
In: Mechanical Engineering
2-) Methane gas enters an uninsulated horizontal pipe with a thin wall of 25 cm in diameter at a temperature of (300+ ??) C with 4.5 tons of mass flow per hour and exits at (280+ ??) C. The pipe is smooth and its length is 10 m and the ambient and environmental temperature is 25 C. Since the smear coefficient of the pipe surface is given as 0.8; (?? = school no. last two digits, for example 0611002072; ?? = 72, ie 300 + 72 = 372 C and 280 + 72 = 352 C) a-) Indoor and outdoor convection coefficients (W / m K), b -) Calculate heat loss from the pipe to the environment (W), c-) Surface temperature of the pipe (C), d-) Calculate the required fan power (W) and interpret the results.
28 will be written instead of a question mark
In: Mechanical Engineering
In wire drawing, is there a difference and if so how much is the force required to draw a wire from cross sectional area of A0 down to A1 in one operation as compared to drawing it through two dies in tandem. Assume that there is friction but no redundant work
In: Mechanical Engineering
The DOSH is responsible for ensuring the occupational safety, health and welfare of people at work as well as protecting the public from safety and health hazards arising from various activities of various sectors. Describe briefly any TEN (10) of these sectors.
In: Mechanical Engineering
Provide the Risk Assessment for Testing and Commissioning of Drainage System.
In: Mechanical Engineering
Based on OSH legislations in Malaysia, briefly describe the FIVE areas from the history, role and development of OSH
In: Mechanical Engineering
Briefly describe 14 Regulations under Factories and Machineries Act, 1967
In: Mechanical Engineering
In: Mechanical Engineering
During a cold winter day. wind at 70 km/h is blowing parallel to
a 4 m high and 10 m long wall of a house. If the air outside is at
7°C and the surface
temperature of the wall is 13°C, determine the rate of heat loss
from that wall by convection.
In: Mechanical Engineering
Define/explain following terminologies:
(a) Sketch a positive cambered airfoil and identify upper surface, lower surface, leading edge, trailing edge, camber line, camber, chord line and airfoil thickness on your sketch
(b) Sketch and explain the lift curve (lift coefficient versus angle of attack) for a positive cambered airfoil. Then compare it with a symmetrical airfoil lift curve.
In: Mechanical Engineering
Consider a Rapid Prototyping product and discuss its manufacturing process in your own words. Include the material(s) used and significant properties of the product. You may choose one of the process listed below:
1. Stereolithography
2. Fused-deposition modelling
3. Multijet/Polyjet modelling
4. Selective laser sintering
5. Ballistic-particle manufacturing (3D printing)
6. Electron-beam melting
7. Laminated-object manufacturing
In: Mechanical Engineering