In: Mechanical Engineering
For H2O, determine the specific volume at the indicated state, in m3/kg.
(a) T = 480°C, p = 20 MPa.
(b) T = 160°C, p = 20 MPa.
(c) T = 40°C, p = 2 MPa.
In: Mechanical Engineering
Determine whether the following statements are correct (y) or not (n): and explain why..
( ) A system have a higher second law efficiency than the first law efficiency during a process
( ) It is impossible that the energy of one isolated system increases
( ) Adding moisture is the ONLY way to obtain saturated air from unsaturated air
( ) A Piston Cylinder device contains air. During a reversible, isothermal process the entropy of the air will never decrease.
In: Mechanical Engineering
The file CO2.txt, found on Blackboard with this assignment, contains 50 numbers, which represent the concentration of atmospheric carbon dioxide (parts per million) recorded at Mauna Loa, HI. The data in the file are the CO2 values on May 15th of each year from 1961 through 2010, (with background level CO2 removed). Fit an exponential model. Use the model to predict the CO2 value for May 15, 2015. Print the result to the screen using fprintf. The actual value was 125.1ppm.
41.5800 42.0100 43.2500 43.2400 43.1600 45.0100 46.0000 46.5700 48.3400 49.0700 49.9200 51.0700 53.4800 54.0900 54.9700 55.8700 57.7500 59.0100 60.4700 62.4600 63.9100 65.1400 66.7500 68.4300 69.9300 71.2100 72.8400 75.2200 76.6700 78.1600 80.3400 80.6600 81.2800 82.6800 84.7900 86.4100 87.8000 90.3000 92.0000 92.8200 95.0200 96.5500 99.3500 101.6100 103.2400 105.9400 107.4300 109.4900 111.1800 114.2200
In: Mechanical Engineering
A gas mixture contains 5 kg of N2 and 10 kg of O2. Determine (a) the average molar mass and (b) gas constant. (c) What-if Scenario:What would the average molar mass be if the gas mixture contained 10 kg of N2 and 5 kg of O2?
a) ? kg/mol
b)? KJ/kgk
c) ? kg/mol
In: Mechanical Engineering
Identify and describe three automatic control systems in a modern automobile (besides criuse control)
In: Mechanical Engineering
A Carnot heat engine has an ideal efficiency of 34% and produces 25 kW of output power. At what rate (MJ/h) must it discharge heat when operating at full power?
In: Mechanical Engineering
1a. What is thermodynamics system?
b. Briefly explain (i) control mass system
(ii) control volume system
c. Comment briefly on control mass system and control volume system at Steadey state
d.
In: Mechanical Engineering
The inner and outer surface temperatures of a glass window 5 mm thick are 15 and 5°C. The thermal resist- ance of the glass window due to conduction is Rt,cond = 1.19 × 10−3 K/W. What is the rate of heat loss through a 1 m × 3 m window? What is the thermal conductivity of the glass?
In: Mechanical Engineering
Problem 1: For a city at 42 deg N latitude, 93 deg W longitude, determine the Local Civil Time (CT) for the sunset on May 21 for central standard time.
In: Mechanical Engineering
Your company has been awarded a contract for 5-story addition on top of an existing 10-story hospital tower at a Cancer Center located in one of the most populated areas of Dallas, Texas. The existing hospital building is beyond 100% occupancy. The company was hired under a design-build contract to complete the $220 million project. Wind-load testing will be conducted. The wind-resisting system will be modified to redistribute loads on the mat foundation. High-strength concrete will be utilized for the addition's floors and columns (to reduce the load). The new mechanical level will be relocated from an upper floor to the floor just above the hospital's existing roof level. Glass fiber reinforced concrete cladding matching the original building's precast concrete façade (but at about one-quarter the weight) is specified in the design. The duration of the project is three-year.
Can you guys help me find the mechanical and electrical system hazards in this problem?!
And what would be the control strategies for them.
In: Mechanical Engineering
When compressed liquid properties are unavailable for a substance, it is acceptable to use the ____ values at the same temperature
Select one:
a. saturated liquid
b. saturated vapour
c. critical
d. triple line
In: Mechanical Engineering
Which model, exponential failure rate or Weibull failure rate is
suitable to capture the wearout
process of a pump bearing? (justify). Using MS Excel and simulated
data, estimate the
reliability a pump bearing for every month over 10 years of
operations (upload the MS
Excel file on the D2L along with your answer sheet).
In: Mechanical Engineering
Select one major aspect of human physiology in the selected readings for this module that particularly interests you. Analyze and evaluate it, then creatively apply it to aviation safety. Explain both how and why you believe it could negatively impact safety in some aspect of aviation operations that also particularly interests you, such as flight operations, maintenance operations, or air traffic control operations.
In: Mechanical Engineering
Consider the following boiler hazards:
1- High steam pressure in the boiler exceeding design limits
2- High steam temperature in the boiler
3- Low water level in the boiler
4- High water level in the boiler
5- High pressure of hot gases inside the furnace
6- Low pressure of hot gases inside the furnace
7- Flammable and toxic gases build up in flues
8- Explosive gas mixture in the furnace or flues
Consider each of the above hazards separately. For each of the hazards give the following details:
a) Suggest the suitable safety control function
b) Draw a simple block diagram of this control function using manual drawing tools or computer software (do not copy and paste the images, no freehand drawings)
c) Explain the working of the above control function in your own words
d) Explain how the above control function protects against the respective hazard
(Five marks for each hazard. Total marks for practical: 40)
In: Mechanical Engineering