Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure of 1000 kPa by an internally reversible compressor. Determine the compressor power per unit mass flow rate if the device is

(a) isentropic,
(b) polytropic with n =1.3,

(c) isothermal.

International Capital, Inc. (IC), is a small investment banking firm that specializes in securing funds for small- to medium-sized firms. IC uses a standardized project format for each engagement

1. Create a network for the project

2. Compute the expected time for each activity.
3. Compute the variance for each activity.
4. Compute the expected project duration.
5. What is the probability of completing the project by day 83?  

consider a column that is fixed at the base and which is pinned at the top. The differential equation for this system is
d^2v/dx^2 + k^2v= R/El ( L -x);k^2=P/EI
it is known that the smallest critical load is
P1= 20.19EI/ L^2.
for this system determine the second smallest critical load P2 and express this as the numerical ratio P2/P1.

In a household refrigerator with evaporator temperature -10 ° C and condenser pressure 1000 kPa R134a is used as refrigerant. Saturated steam at the compressor inlet The refrigerant that is in the state is in the state of saturated liquid at the outlet of the condenser. Entropy at the compressor outlet is 0.985 kJ / kgK. According to this,

a) Cycle T-s and P-h diagrams, showing saturation curves on the diagram Draw.

b) Calculate the isentropic efficiency of the compressor.

c) Find the cooling performance coefficient of the refrigerator.

d) What is the second law efficiency of this refrigerator?

PLEASE EXPLAİN STEP BY STEP

Five mutually-exclusive projects consisting of reinforcing dams, levees, and embankments are available for funding by a certain public agency. The following tabulation shows the equivalent annual benefits and costs for each: Project Annual Benefits Annual Costs A $1,800,000 $2,000,000 B $5,600,000 $4.200,000 C $8,400,000 $6,800,000 D $2,600,000 $2,800,000 E $6,600,000 $5,400,000 Assume that the projects are of the type for which the benefits can be determined with considerable certainty and that the agency is willing to invest money in any project as long as the B-C ratio is at least one. Determine the annual worth (AW) of the best project that the public agency will select. The agency’s MARR is 10 % per year and the project lifetimes are each 15 years.

A 15/16 in. wide key has depth of 5/8 in. It is 12 inches long and is to be used on a 200 hp, 1160 rpm, squirrel-cage induction motor. The shaft diameter of 3 7/8 inches. The maximum running torque is 200% of the full-load torque. Compute the maximum torque (ans: 21,733 in-lb) Please show solution.

Air is compressed from an inlet condition of 100 kPa, 300 K to an exit pressure of 1000 kPa by an internally reversible compressor. Determine the compressor power per unit mass flow rate if the device is
(a) isentropic,
(b) polytropic with n =1.3,
(c) isothermal.

A person without a lower limb or limbs may face huge cost to get prosthetic legs. A metal prosthesis can cost up to RM10,000 depending on the specifications and requirement of the patient. Cane furniture was made by bending the stem in such beautiful shapes that could also hold human weight. The usage of sustainable materials such as cane may help the sustainability of life of a person without a limb by ensuring it is affordable and available to people of all levels as well as helped the sustainability of the environment. However, one question - can you make a leg out of a cane? Discuss.

(20) A 15kW electric motor, which is running at 43 rev/s, is used to drive a crusher which operates 24 hours per day. An engineer has specified 212 mm and 315 mm pitch diameters for small pulley and large pulley respectively; and C 3454 V-belt type.

a) Calculate allowable power, design power and required number of belts. (Take design factor nd as 1.)

In a gas turbine generating station the overall compression ratio is 12/1, performed in three stages with pressure ratios of 2.5/1, 2.4/1, and 2/1 respectively. The air inlet temperature to the plant is 25 ℃ and intercooling between the stages reduces the temperature to 40 ℃. The HP turbine drives the HP and intermediate-pressure compressor stages; the LP turbine drives the LP compressor and the generator. The gases leaving the LP turbine passed through the heat exchanger which heats the air leaving the HP compressor. The temperature at inlet to the HP turbine is 650 ℃, and reheating between the turbine stages raises the temperature to 650 ℃. The gases leaves the heat exchanger at a temperature of 200 ℃. The isentropic efficiency of each compressor stage in 0.83, and isentropic efficiencies of HP and LP turbines are 0.85 and 0.88 respectively. Take the mechanical efficiency of each shaft as 0.98. The air mass flow is 140 kg/s. Neglecting the pressure losses and changes in kinetic energy, and taking the specific heat of water as 4.19 kJ/kg.K, and take Cp and γ for air to be 1.005 kJ/kg.K and 1.4 respectively. calculate. (a) The power output in kilowatts; [2 marks] (b) The cycle efficiency; [2 marks] (c) The flow of cooling water required for the intercoolers when the rise in water temperature must not exceeded 40 K; [2 marks] (d) The thermal ratio of heat exchanger [2 marks] (e) Draw the T-s diagram [2 marks]

A 20kW electric motor, which is running at 43 rev/s, is used to drive a crusher that operates 24 hours per day. An engineer has specified 212 mm and 315 mm pitch diameters for the small pulley and large pulley respectively; and C 3454 V-belt type.

a) What should be the conservative service factor for this belt and pulley system?

b) Calculate the center distance between the pulleys?

c) Calculate allowable power, design power, and required number of belts. (Take design factor nd as 1.)

d) Calculate centrifugal tension, forces at tension side and loose side, initial tension, and factor of safety. (Take friction coefficient including wedge effect as 0.5123.)

Suppose the Gulfstream G550 is cruising at an altitude and of 41,000 feet. and 559 miles per hour, respectively. If the plane currently weighs 74,950 pounds, how much thrust is required to maintain these flight conditions? The wingspan is 91.5 feet and the wing platform area is 1,137 square feet. The Oswald efficiency factor is 0.9 and the zero-lift drag coefficient is 0.0165.

List, draw and explain the strengthening mechanisms for metals. Why we are using this techniques?

An ideal gas-turbine cycle with two stages of compression and two stages of expansion. The overall pressure ratio is 9. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. assuming an efficiency of 86 percent for each compressor stage and an efficiency of 90 percent for each turbine stage. Draw the T-S diagram and determine the back work ratio and the thermal efficiency of the cycle, assuming (a) no regenerator is used and (b) a regenerator with 85 percent effectiveness is used.

A Dual cycle engine is analyzed using the air standard method. Given the conditions at state 1, compression ratio (r), pressure ratio (rp), and cutoff ratio (rc) determine the efficiency and other values listed below.

Note: The gas constant for air is R=0.287 kJ/kg-K.

Given Values

T1 (K) = 334

P1 (kPa) = 115

r = 11.5

rp = 1.34

rc = 1.14

a) Determine the specific internal energy (kJ/kg) at state 1.

b) Determine the relative specific volume at state 1.

c) Determine the relative specific volume at state 2.

d) Determine the temperature (K) at state 2.

e) Determine the pressure (kPa) at state 2.

f) Determine the specific internal energy (kJ/kg) at state 2.

g) Determine the temperature (K) at state 3.

h) Determine the pressure (kPa) at state 3.

i) Determine the specific internal energy (kJ/kg) at state 3.

j) Determine the specific enthalpy (kJ/kg) at state 3.

k) Determine the temperature (K) at state 4.

l) Determine the pressure (kPa) at state 4.

m) Determine the specific enthalpy (kJ/kg) at state 4.

n) Determine the relative specific volume at state 4.

o) Determine the relative specific volume at state 5.

p) Determine the temperature (K) at state 5.

q) Determine the pressure (kPa) at state 5.

r) Determine the specific internal energy (kJ/kg) at state 5.

s) Determine the net-work per cycle (kJ/kg) of the engine.

t) Determine the heat addition per cycle (kJ/kg) of the engine.

u) Determine the efficiency (%) of the engine.