14. Sacrificial anodes are bolted inside the_____ of a heat exchanger

15. Sacrificial anodes minimize______ within a heat exchanger

17. The two factors that determine the choice of tools and equipment for a specific heat exchanger
of a heat exchanger maintenance job are familiarity with the (a)________ and knowledge of the (b)______

18. Blockage in a shell-and-tube heat exchanger may range from relatively light accumulations of (a)_______ and (b)_______ to heavy blockage caused by (c)_______ in cooling water

22. Automatic cleaning systems work by either (a)________or (b)_______ means

23. Some automatic chemical cleaning systems periodically introduce chlorine into the incoming water to kill________ and prevent growth on tube walls

25. When a main condenser is to be flooded, jack or supports may be necessary to________

26. Maintenance of smaller heat exchangers is approached differently from large heat exchangens because the smaller components are (a)______ and can be moved by (b)______

Compare the phase angle obtained from the free response and the phase angle obtained from the harmonic response in physical meaning and explain their importance.

Explain the advantages and disadvantages of the following four methods when calculating the harmonic response.

1. method of undetermined coefficients
2. a graphic method
3. complex number method
4. Laplace transformation

Design a steam power cycle that can achieve a cycle thermal efficiency of at least 40% under the conditions that all turbines have isentropic efficiencies of 80% and all pumps have isentropic efficiencies of 65%. Prepare an engineering report describing your design. Your design report must include, but is not limited to, the following:

1. Discussion of various cycles attempted to meet the goal as well as the positive and negative aspects of your design.

2. System figures and T-s diagrams with labeled states and temperature, pressure, enthalpy, and entropy information for your design.

3. Sample calculations.

Suppose you own some land next to a 50 MW wind farm located on Colorado’s Front Range. Your land has a fantastic cliff/ridgeline with an elevation difference of 250 m. Evaluate whether or not you can make money by building a pumped hydroelectric energy storage system on your land that interfaces with the wind farm. Your plan is to capture excess energy from the wind farm or buy energy from the wind farm when electricity prices are low and sell that energy back to the grid when electricity prices are high (assume that the utility that owns the grid will grant you a fair contract). You find that a good power rating for your storage system is 50% of the rated wind farm output, or 25 MW. Also your storage system should be able to generate electricity at rated power for 8 h.

a. Determine the flow rate and reservoir size needed to accomplish the required power output and energy capacity. Pumped hydroelectric plants generally run at 80%–90% generating efficiency, depending on the size of the machinery. Suggest a reasonable surface area and depth for your two reservoirs.

b. Assume it costs $500 per kW to install your turbomachinery and penstocks, plus $2 per cubic yard to build reservoirs. Calculate the initial capital cost of your pumped hydroelectric system.

c. Suppose you can buy energy from the wind farm at $0.035/kWh between the hours of 10:00 pm and 8:00 am to charge your storage and sell energy between 1:00 pm and 9:00 pm back to the grid at $0.1/kWh. Select a reasonable simple payback period that would motivate you to invest in energy storage. Calculate the maximum capital cost expenditure on your energy storage system that would allow this payback period.

d. Would you decide to build this energy storage system? Why or why not?

Water flows at 112°C through a steel pipe (k=90 W/m °C) which has a 6 cm inside diameter and 8cm outside diameter. Such that, hi =346 W/m2 °C and ho =6.0 W/m2 °C. Surrounding air temperature is 20°C. To reduce heat loss to the surroundings the pipe is covered with an insulation insulation having the thickness of 4.0 mm and k=0,5W/m°C . Calculate;
a.    The heat loss by convection per unit length from the bare pipe (before insulation).
b.    The heat loss from the insulated pipe,
c. The critical radius. And discuss the result.

Consider a circular (cylindrical) pin fin attached to a flat plane with the following properties:

k = 237 W/mC (thermal conductivity)

L = 100mm (length)

r = 2mm (radius)

T_b = 80 C (temperature at fin base)

T_inf = 20 C (air temperature)

h = 12 W/m^2C (Convection Coefficient)

Find the following using the infinitely long and insulated (adiabatic) tip methods:

The temperature of the fin at a distance L/2

Heat transfer rate from the fin

Fin efficiency

Fin Effectiveness

Thermal Resistance

What are the various methods used for comparison during the evaluation of concept? Explain briefly.

Explain what you understand by the word configuration design?

g)When at least 50% copper material is alloyed with ..............................., ……………. material is obtained

h)Alloys with the highest strength / weight ratio ……………… are used in prosthesis and implant production

i)…………… used in coating canned cans, it is also used in the production of …………… material in joining processes)

j)………….plastic materials that do not melt when exposed to heat are produced by the method of ……………………… ..….)

k)…………………………… is used in the production of gaskets and tires)

l)The ………………..strength of ……………… used in cutting tool manufacturing is greater than the tensile strength)

In your first assignment as a new engineer at a large jet engine manufacturer, you are part of a team investigating a new generation of lightweight turbine engines for regional jet liners. In order to increase efficiencies and improve performance, lightweight materials with significant toughness are needed. However, the operating conditions include high temperatures and high stresses. Of the three categories of composites, which one would you select for further investigation in an engine inlet application where temperatures in the vicinity of 500°C are experienced?

1. polyethylene
2. metal matrix composite
3. iron-aluminide intermetallics
4. ceramic matrix composite
5. polymer matrix composite

What is torque wrench and why it is used in oil rigs

The optical Tachometer

a- Can the SIS optical tachometer be used to determine the direction of rotation?
b- If number of slots in the disc is changed what effect would this have on the results?
c- Discuss sensor characteristics as linearity, repeatability, accuracy and sensitivity.
d- What are the sources of errors in this experiment?