Air is expanded isentropically in an adiabatic turbine, to produce 135 kW of power. If the mass flow rate is 0.75 kg/s, and the air at the exit is 500 K and 305 kPa, then what is the temperature and pressure at the inlet of the turbine?
(a) The temperature is K.
(b) The pressure is kPa.
NOTE: Do NOT approximate the air as having a constant specific heat.
In: Mechanical Engineering
The following problem description applies also to the next two problems.
A piston-cylinder device contains 2 kg of a saturated liquid mixture at an initial state 1 with p1= 100 kPa and x1= 0.8. The water is heated at constant pressure until its final state 2 with volume V2 = 1.947V1.
Its initial volume, in m3/kg, is closer to:
Its final temperature, in oC, is closer to:
The amount of heat supplied to the steam during the expansion process, in kJ, is closer to:
In: Mechanical Engineering
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Real engine pistons are tapered. Explain the need for this feature; aid your explanation with a sketch of a piston in a cylinder. |
In: Mechanical Engineering
List the Electric equipment used in Testing and Maintenance of Alternators. Discuss each equipment.
In: Mechanical Engineering
Explain ductility, strength and elastic modulus. Explain and compare these for ceramics and metals.
In: Mechanical Engineering
In: Mechanical Engineering
A door is closed under the control of a spring and dashpot. The spring gives a torque of 13.5 Nm when the door is closed and has a stiffness of 50 N.m/rad. The dashpot gives a damping torque of 100 N.m.s/rad. The moment of inertia of the door about its hinges is 90 Kg.m2. Derive an expression for the motion of the door if it is opened 90o and released and find approximately the time it takes to close
In: Mechanical Engineering
Write a report on AI based Social distancing monitoring using drone with out human interaction report should contain drone design it specification it's algorithm control system algorithm.minimum 10 A4 size page.No plagiarism is allowed other wise down rate is given
In: Mechanical Engineering
Refrigerant 22 passes into a device operating at steady state with a single inlet and two outlets. The flow at the device inlet has a pressure of 60 lbf/in2, a temperature of 40°F, and a velocity of 2 ft/s. The inlet has an area of 2 ft2. The flow at the first outlet has a pressure of 60 lbf/in2, a temperature of 120°F, and a velocity of 3 ft/s. The first outlet has an area of 1 ft2. The flow at the second outlet has a temperature of 120°F. The device consumes 70 hp of power. Determine the mass flow rate in lb/s and pressure of the flow in lbf/in2 at the second outlet. Assume the device is well-insulated and neglect kinetic and potential energy changes.
please donot copy and paste i will rate you negative .. take care of sign of work and explain in details
In: Mechanical Engineering
At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.2 L. Determine per cylinder:
c) the heat addition per cycle, in
kJ.
d) the heat rejection per cycle, in
kJ.
e) the net work per cycle, in kJ.
f) the thermal efficiency.
g) the mean effective pressure, in bar.
In: Mechanical Engineering
1. Steel is the material that has been chosen for a small link in the fuel injection mechanism in a space vehicle. Which steelmaking process would probably be used to manufacture the steel for this application?
2. You are involved in the design and construction of a new-steel -making factory. Which steel-making process would you incorporate into this new plant? How would the geographic location of the plant affect the selection of the process?
In: Mechanical Engineering
A spring loaded piston cylinder contains 1.5 kg of air
at 27°C and 160 kPa. It is
now heated in a process where pressure is linear in volume, P = A +
BV, to twice the
initial volume where it reaches 900 K. Find the work, the heat
transfer and the total
entropy generation assuming a source at 900 K. Is this a possible
process?
In: Mechanical Engineering
The following description applies to the next three problems.
Air enters steadily an electrical hair dryer at 100 kPa and 27 C. It leaves the hairdryer at a temperature of 80 C, an exit velocity of 10 m/s, and at the same pressure. The exit and inlet areas are 20 cm2 and 40 cm2 respectively.
(Assume properties of air cp= 1.007 kJ/kg.K, cv = 0.72 kJ/kg.K, and R= 0. 287 kJ/kg.K )
The mass flow rate of air entering the hairdryer, in kg/s, is closer to
The velocity of the air at the inlet of the hairdryer, in m/s, is closer to
The total power the hairdryer needs to operate at the stated conditions, in kW, is closer to:
In: Mechanical Engineering
1.A materials fatigue resistance can be improved by
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removing sharp corners in the geometric design of the component |
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introducing a residual compressive stress on the surface of the component. |
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operating the component at temperatures above its melting point |
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introducing surface flaws to the component |
2.What test is used to determine the toughness of a material under shock loading?
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hardness test |
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Impact test |
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compression test |
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tensile test |
3.Martensite
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is a phase that consists of lamellar arrangement of iron and cementite |
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is harder than pearlite |
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is harder than ferrite |
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has a high level of ductility |
In: Mechanical Engineering
In: Mechanical Engineering