Questions
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits...

A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 4 MPa in the boiler and 5 kPa in the condenser and a turbine inlet temperature of 700°C. The boiler is sized to provide a steam flow of 50 kg/s. Determine the power produced by the turbine and consumed by the pump. Use steam tables.

Find the values of power produced by the turbine and consumed by the pump in kW

In: Mechanical Engineering

What is strain hardening and what is its difference with work hardening? (10 marks)

What is strain hardening and what is its difference with work hardening?

In: Mechanical Engineering

Water flows in a horizontal pipe of d1=100 mm with a velocity wt=1m/s and pressure p1=90...

Water flows in a horizontal pipe of d1=100 mm with a velocity wt=1m/s and pressure p1=90 kPa. It enters a pipe reduction to a diameter d2=50 mm. Pressure after the pipe reduction drops to p2=80 kPa while temperature is unchanged. Find entropy generation rate in the zone of the pipe reduction. Assume that the surroundings is at Ts=20?C and pressure is ps=80kPa and the steady state is considered. What will be the exit pressure after the pipe reduction if the process was reversible? Water density is ?=1000kg/m^3. Specific enthalpy and entropy of the water can be calculated from formulae: h=href+cT[K]+?(?-?ref), where c=4.19 KJ/(kgK).

In: Mechanical Engineering

Thrust is transmitted to an aircraft control by a tube which is 1 m long with...

Thrust is transmitted to an aircraft control by a tube which is 1 m long with an outside diameter of 25 mm and wall thickness of 2 mm. Assume the ends of the tube to be pin jointed and guided. Calculate the failing load by:

a) Euler theory

b) Rankine Theory

Assume E = 200 GN/m2, a =1/3000 and ?c = 300 MN/m2

In: Mechanical Engineering

In the carburizing of 1018 steel... The carbon concentration will be equal to or greater than...

In the carburizing of 1018 steel...

The carbon concentration will be equal to or greater than 18% by wt 2mm below the surface after 24 hours at 500C.

The carbon concentration will be equal to or less than 0.18% by wt 2mm below the surface after 24 hours at 500C.

The carbon concentration will be equal to or less than 18% by wt 2mm below the surface after 24 hours at 500C.

The carbon concentration will be equal to or greater than 0.18% by wt 2mm below the surface after 24 hours at 500C. The carbon concentration will be equal to or greater than 18% by wt 2mm below the surface after 24 hours at 500C.

In: Mechanical Engineering

(Computer memory) (Computer-integrated Manufacturing) A retail store uses a CD ROM with 700 MB capacity to...

(Computer memory) (Computer-integrated Manufacturing)

A retail store uses a CD ROM with 700 MB capacity to store its products name, specification and manufacturer information. On the average, including the spaces between words, the products names are 15 letters long. The product specification and manufacturer information require 60 and 30 letters each. An additional 200 letters is required for retailer tracking information.

How many CDs are necessary for 1,000,000 products?

In: Mechanical Engineering

1. Find a picture on the internet that shows the underlying structure of an aircraft wing...

1. Find a picture on the internet that shows the underlying structure of an aircraft wing and discuss how it is similar to the box beam concept.

2.The box beam concept handles bending and torsional loads. Consider and discuss what structural elements we have explored so far in this course that address these loads. Hint: there are two (one for bending and one for torsion). Also, please include the following in the discussion.

Depending on the air vehicle performance requirements a wing’s thickness is different. For example, a lower speed vehicle such as a large transport aircraft (e.g., B-747) will have a thicker wing compared to a fighter aircraft. The reasons for this are beyond the scope of this course.

Consider the I-beam concept we have been exploring in this module. Discuss what happens as the wing thickness changes. For example, what is the variable in the bending equation that is effected as the wing thickness changes?

How could the allowable stress level be managed for the different wing structures (i.e., what happens to the skin thickness, which is the upper part of the box beam)?

In: Mechanical Engineering

A Diesel engine with a compression ratio of 16 has a cutoff ratio of 1.5. The...

A Diesel engine with a compression ratio of 16 has a cutoff ratio of 1.5. The state before polytropic compression (exponent 1.3) is 1700 cm3, 96 kPa and 22°C and there is isentropic expansion.
(a) Sketch the P-v diagram for this cycle.

(b) Calculate the heat transfer in and heat transfer out.

(c) Determine the thermal efficiency.

(d) Calculate the mean effective pressure.

In: Mechanical Engineering

Prove that a Kempe’s mechanism traces an exact straight line using two identical mechanisms.

Prove that a Kempe’s mechanism traces an exact straight line using two identical mechanisms.

In: Mechanical Engineering

1. what is an end effector? Describe different types of grippers and tools that are connected...

1. what is an end effector? Describe different types of grippers and tools that are connected to manipulator.

2. explain different types of sensors used in robotic system.

3. list the applications of robotics and explain briefly.

4. Define the following
    a. load carrying capacity
    b. work volume
    c. end effector

Please provide the answers for the above questions which are related to ROBOTICS

In: Mechanical Engineering

Estimate the area of forest (in hectares) needed to absorb the carbon dioxide produced by a...

Estimate the area of forest (in hectares) needed to absorb the carbon dioxide produced by a 1 GWe coal-fired power plant with a capacity factor of 80% and efficiency of 35%. Is this a practical method of counteracting carbon emissions? Explain how you got your number for absorption amount.

In: Mechanical Engineering

Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature...

Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature of the air is 1000°C.

a) Compute the specific volume ratio.

b) Compute the boundary work (kJ/kg)

c) Compute the change in specific internal energy by:
1. Using the tables.
2. Integrating the polynomial (cp)
3. Assuming constant specific heat.

d) Repeat c for specific enthalpy

e) Compute the heat

In: Mechanical Engineering

2. (i) What factors must be considered to provide a safe and healthful workplace for the...

2. (i) What factors must be considered to provide a safe and healthful workplace for the workers (R)?

Or What are the major factors affecting fatigue of the operator (R)?

(ii) What are the opportunities for savings through the application of methods engineering and work measurement (R)?

(iii) In the conduct of operations analysis, explain the importance of the (1) process of manufacture, and (2) set-up and tools (R).

(iii) State the basic principles of motion economy for the “use of the human body” (R).

(iv) State the body members involved in the five classifications of movements. Explain the concept that all motions should be made at the lowest classification of movements (R). Explain difference between the flow process chart and the flow diagram?

(v) State briefly the macroscopic approaches to making improvements in the workplace (R).

Or What are the macroscopic approaches to making improvements in the work place with particular reference to: (a) physical environment, (b) physiological factors, (c) physiological factors, and (d) sociological factors?

(vi) State the manner by which the principle of motion economy can be employed in the design of tools and equipment (R).

(vii) Explain the role of methods analyst in providing a good working condition? Do working conditions appreciably affect output (R)?

Or Why should the method analyst accept as a part of his or her responsibility to provide good working condition to the operators? Do working conditions appreciably affect output? Explain (R).

(viii) What are the main uses of human machine chart? Show the basic features human machine chart, including summary form of such a chart (R).

(ix) What are the common considerations for improving working conditions? State the benefits of ideal working conditions (R)?

(x) Show the proper flow process chart symbols for the following processes: (a) move material by truck, (b) raw material in bulk storage, (c) examine material for quality, (d) material in truck waiting to be processed, and (e) mix material to proper consistency.

In: Mechanical Engineering

Which of the following statements regarding dimensioning is NOT true? 1) Dimensions should be given where...

Which of the following statements regarding dimensioning is NOT true? 1) Dimensions should be given where the shapes (contours) are shown. 2) Finish marks are shown in every view where the finished surface appears as an edge. 3) Dimensioning in engineering drawing involves two steps; size dimensions and location dimensions. 4) Current ANSI standards require that the diameter symbol (Ø) be used following the dimension. 5) Notes should always be lettered horizontally.

In: Mechanical Engineering

Explain Pycnometer method & procedure for calculating density. Evaluate the advantages and disadvantages of this process.

Explain Pycnometer method & procedure for calculating density. Evaluate the advantages and disadvantages of this process.

In: Mechanical Engineering