Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

problem 1)a) Define the following

(i) Process

(ii) Intensive property

(iii) open system

(iv) Thermodynamic equilibrium

b) Show that internal energy is a property of the system.

c) Air at a temperature of 15°C passes through a heat exchanger at a velocity of 30 m/s where its temperature is raised to 800°C. It then enters a turbine with the same velocity and expands until the temperature falls to 650°C. On leaving the turbine air is taken at a velocity of 60 m/s to a nozzle where it expands until the temperature has fallen to 500°C. If the air flow rate is 2 kg/s, find out:

(i)Rate of heat transfer to air in the heat exchanger

(ii)Power output from the turbine assuming adiabatic conditions

(iii) Velocity at the exit of the nozzle. Take enthalpy of air as Cpt where Cp is the specific heat of air (=1.005 kJ/kgK) and t is the temperature.

problem 2)a) Derive the expression for thermal efficiency of a diesel cycle in terms of compression ratio, cut off ratio and ratio of specific heats.

b) A two stage air compressor receives 0.238 m3/s of air at 1 bar and 27°C and discharges it at 10 bar. The polytropic index of compression is 1.35. Assuming perfect inter cooling, determine

(i) the minimum power required for compression

(ii) Power needed for single stage compression to the same pressure

(iii) Maximum temperature in both cases.

problem 3)a) With neat sketches describe the effect of super heating and subcooling on the vapor compression refrigeration cycle.

b) Derive an expression for volumetric efficiency of a reciprocating air compressor in terms of clearance ratio and the pressure ratio.

c) In a gas turbine plant working on Brayton cycle, air at the inlet is at 27°C and 0.1MPa. The pressure ratio is 6.25 and maximum temperature is 800°C. The turbine and compressor efficiencies are each 80%. Find:

(i) Turbine exhaust temperature

(ii) cycle efficiency

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M96477

Have any Question? 


Related Questions in Mechanical Engineering

1 the tank is accelerated upward at a uniform rate does the

1. The tank is accelerated upward at a uniform rate. Does the manometer level go up or down? 2. Glass viewing windows are to be installed in an aquarium. Each window is to be 0.6 m in diameter and to be centered 2 m belo ...

Example how an p-channel flash eprom would work is the

Example how an p-channel flash EPROM would work. Is the p-channel worse or better than the n-channel asides form speed? Estimate the write and erase times (using the Fowler-Nordheim tunneling formulae for a triangular ba ...

A closed rigid tank having a volume of 1 m3 contains a

A closed, rigid tank having a volume of 1 m 3 contains a mixture carbon dioxide (CO 2 ) and water vapor initially at 70°C and 200 kPa The mass of water vapor in the tank is 0.10 kg. The tank contents are cooled to 20°C. ...

A neighborhood fuel cell power plant is to be designed for

A neighborhood fuel cell power plant is to be designed for an electric power output of 2000 kW with liquid-water product. Estimate the flow rates of hydrogen and oxygen during peak power production, assuming an 80% effic ...

Electrical current is passed through a resistor immersed in

Electrical current is passed through a resistor immersed in a liquid in an adiabatic container. The temperature of the liquid is varied by 1°C. The system consists solely of the liquid. Does heat or work flow across the ...

An air conditioner is a refrigerator with the inside of the

An air conditioner is a refrigerator with the inside of the house acting as the cold reservoir and the outside atmosphere acting as the hot reservoir. Assume that an air conditioner consumes 1.70 X 10 3 W of electrical p ...

Optional extra credit problemyou have been given a map

OPTIONAL EXTRA CREDIT PROBLEM You have been given a map which references a monument having coordinates North 2403306.986, East 5873350.973, expressed in US Survey Feet. A statement on the map states that the area mapped ...

During the flow of 200 ft3nbsps of water through the

During the flow of 200 ft 3  /s of water through the hydraulic turbine shown, the pressure indicated by gage A is 12 psig. What should gage B read if the turbine is delivering 600 hp at 82% efficiency? Gage B is designed ...

You need help with these 3 problems to be answered

You need help with these 3 problems to be answered correctly and with an explinations and steps.There are two pictures with three questions, please look and understand them before contacting me as well. 1. An alloy at 10 ...

A typical diver inhales 0450 liters of air per breath and

A typical diver inhales 0.450 liters of air per breath and carries a 25 L breathing tank containing air at a pressure of 300. bar. As she dives deeper, the pressure increases by 1 bar for every 10.08 m. How many breaths ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro