The temperature and pressure of the steam at the inlet of a high pressure turbine is 500 ° C, respectively. It is 12 MPa and 300 ° C and 3MPa at its outlet. If the mass flow of steam is 400 kg / h, how much is the isentropic efficiency of the turbine?
In: Mechanical Engineering
In 2014, General Motor (GM) decided to recall about 1.6 million vehicles worldwide to rectify vehicles in which the ignition can switch to ‘off’ while the car is running, disabling the power steering and air bags.
i. Critically discuss recall exercises practised by manufacturers with analytical thoughts?
In: Mechanical Engineering
How does the impact strength of the nails compare to tabulated values of steel?
In: Mechanical Engineering
With increases in obesity rates over the past several decades, health care providers have become concerned about the effects of obesity on health. As a health psychologist, you are interested in people’s perceptions and responses to food as this might influence obesity. You are curious if people that are impulsive or have difficult with impulse control are more likely to be obese and if they perceive sweet, high calorie foods as being more desirable than the general population. Given this, you screen a group of participants and recruit participants (n=20) that have high impulsivity scores (that is, they are more impulsive). From your sample, you collect participant’s weight and scores on the Food Perception Inventory (FPI) which measures individual’s preference for high calorie foods. For obesity, you know the national mean (168) and standard deviation (26.38), but you only know the population mean (103) for the FPI. Using the data below, answer the following questions:
Participant ID |
Weight |
FPI |
1 |
204 |
115 |
2 |
198 |
111 |
3 |
219 |
119 |
4 |
250 |
122 |
5 |
170 |
105 |
6 |
232 |
110 |
7 |
178 |
104 |
8 |
177 |
107 |
9 |
192 |
109 |
10 |
198 |
110 |
11 |
203 |
115 |
12 |
211 |
114 |
13 |
198 |
112 |
14 |
212 |
120 |
15 |
215 |
119 |
16 |
236 |
120 |
17 |
196 |
115 |
18 |
198 |
115 |
19 |
180 |
112 |
20 |
210 |
121 |
Questions:
1. Calculate a one sample test for Weight and report the result
2. What is your decision for Weight (how will you determine if this sample is unique or rare)? Interpret your result
3. Calculate a one sample test for FPI and report the result
4. What is your decision for FPI? Interpret your result
In: Mechanical Engineering
The diameter of the discharge and suction pipe of a boiler feed pump is 4 inches and 6 inches, respectively. The water delivered is 250 GPM and the temperature is 60 F. The discharge pressure near the pump is 90 psig and the suction is 12 in.hg vacuum. Find the total dynamic head if the discharge gage is located 3 ft above pump centerline and the vacuum gage connection to the suction pipe is 2 feet below the center of the pump. Assume that the head necessary to overcome the frictional resistance through the pump is 2.20 feet.
In: Mechanical Engineering
PLEASE ANSWER ALL QUESTIONS. ALL THE QUESTION ARE RELATED IN EVERY NUMBER
1. "For each of the following questions, use a dry bulb temperature of +26°C and a wet bulb temperature of +15°C, in a room with 70 kg of dry air. The atmospheric pressure is 101,325 Pa. What is the relative humidity of this air? Enter your answer as a number from 0 to 100 without any units or percent sign. Your answer is correct if it is within 3 percent of the correct answer."
2. What is the moisture content of a kg of dry air? Enter your number of kg of wv/ kg of dry air without units. Your answer is correct if it is within 0.0004 kg of wv/ kg of dry air of the correct answer.
3. What is the absolute humidity (total weight of all of the water vapour in the room)? Enter your number of kg of wv without units. Your answer is correct if it is within 5 percent of the correct answer.
4. What is the total heat of a kg of dry air? Enter your number of kJ/ kg of dry air without units. Your answer is correct if it is within 1.5 kJ/ kg of dry air of the correct answer.
5. What is the total heat for all of the air in the room? Enter your number of kJ without units. Your answer is correct if it is within 5 percent of the correct answer.
6. What is the dew point temperature of air? Enter your temperature in °C without units. Your answer is correct if it is within 1°C of the correct answer.
7. What is the total amount of moisture condensed if all of the air in the room is cooled to +2°C? Enter your number in kg wv without units. Your answer is correct if it is within 15 percent of the correct answer.
8. What is the volume of all of the air in the room? Enter your number in m^{3} without units. Your answer is correct if it is within 5 percent of the correct answer.
In: Mechanical Engineering
develop a mathematical model and rate of return code for helical compression first priority used individual which is operated at minus 273 degree centigrade with the help of liquid helium and liquid nitrogen.
write a fortran code for the same
In: Mechanical Engineering
Drag measurements were taken for a 5 cm diameter sphere in water at 20 °C to predict the drag force of a 1 m diameter balloon rising in air with standard temperature and pressure. Given kinematic viscosity of water (v) = 1.0 X 10^{-6} m^{2}/s and kinematic viscosity of air (v) = 1.46 X 10^{-5} m^{2}/s.
In: Mechanical Engineering
A steel ruler (100 mm) is used for measuring the length of a block. The ambient temperature is found likely to vary in between 24 °C and 25 °C. The temperature is likely to be anywhere within these limits. The temperature variation follows square distribution, with expected value to be 24.5 °C. Determine the degree of uncertainty that will be registered when measurement is done using steel scale? CTE = 11.5 x 10-6 / °C
In: Mechanical Engineering
In: Mechanical Engineering
Prepare a case study which explains the effect of the following components and process on the boiler efficiency and mention how much it changes the efficiency:
Fuel treatment
Air preheater
Feed water heater
Economizer
Flue gas treatment
Feed water treatment
In: Mechanical Engineering
By choosing one of the abrasion test methods applied to metals; Write how the test is done, the graphics drawn as a result of the test, which parameters are drawn, and which material properties can be determined from the graph.
In: Mechanical Engineering
In: Mechanical Engineering
A steam turbine receives superheated steam at 18.0
kg/s, 500.°C, and 3.00 MPa and exhausts it to 10 kPa with a quality
of 96%. If the turbine is assumed to be internally reversible,
determine the rate of heat loss from the turbine surface if the
power output is 20.MW The surface temperature of the turbine is
uniform at 350.°C, and the local environment (ground state) is
taken to be saturated liquid water at T0 = 20.0°C. Neglect all flow
stream kinetic and potential energies in this problem
Enthalpy at state # 1 is?
Entropy at state #2 is ?
Exergy at state 2 is ?
Heat Transfer through the system is?
second law efficiency is?
In: Mechanical Engineering
A feedwater heater is a device to heat the feedwater before it goes into the boiler. This device receives one stream of saturated vapor at 0.8 MPa and another stream of compressed liquid at 0.8 MPa and 60 oC. These two streams combined to become saturated liquid at 0.8 MPa at the exit of the feedwater heater. The mass flow rate of the compressed liquid is 100 kg/s. Determine a) the mass flow rate of the saturated vapor, b) the exergy destroyed in the feedwater heater (To=300K, Po=0.1 MPa) (10)
In: Mechanical Engineering