Skip to main content

Posts

Showing posts from 2009

ANSWERS TO BOARD EXAM REVIEWER: POWER ELEMENTS

Here's the answers to the questions posted on the last article.
1. The measure of how effective a boiler is in transferring heat from furnace to the water and steam.
Answer: C. Boiler efficiency

2. A heat exchanger used to remove dissolved air in water?
Answer:b. Deaerator

3. A state of water where the quantity of steam and liquid water is indistinguishable.
Answer: a. Critical point
Reference: p.62, Thermodynamics 6th.Ed., Faires and Simmang

BOARD EXAM REVIEWER: POWER ELEMENTS

I have here some of the most frequently appearing types of "elements" on the subject of power and industrial plant engineering. Answers will be provided after a week.
These questions were based on previous board examination and was reworded and modified but it carries the same thought as the actual questions.


Instruction: Choose the BEST answer.

1. The measure of how effective a boiler is in transferring heat from furnace to the water and steam.
A. Coefficient of heat transfer
B. Boiler conductivity
C. Boiler efficiency
D. Furnace efficiency

2. A heat exchanger used to remove dissolved air in water?
a. Condenser
b. Deaerator
c. Reheater
d. Boiler

3. A state of water where the quantity of steam and liquid water is indistinguishable.
a. Critical point
b. Absolute zero
c. Boiling point
d. Freezing point

4. A power plant that harness energy from the difference in temperature between the depths of the ocean.
a. OTEC
b. Geothermal plant
c. Hydroelectric plant
d. Wave power plant


5…

SOLUTION TO MECHANICAL BOARD EXAM PROBLEMS: Power Set-1

Here are the solutions to board problems given at Power Subject Set-1. If you do not understand anything, feel free to write a comment voicing out your concern. I'm still looking for better ways to present my solution. I still don't know how to present equations and mathematical symbols with blogger. Please bear with me.

1. An automobile tire is inflated to 32psig pressure at 50 degree F. After being driven, the temperature rises to 75 degree F. Determine the final gage pressure assuming the volume remains constant. (Electrical Engineering Board Exam Problem)

Solution:
Since volume is constant, use Charles’ Law on constant volume processes.
P1/T1=P2/T2
Note: P and T should be absolute.

(32+14.7)/ (50+460) =P2/ (75+460)

P2=48.99 psia

Converting back to gage pressure,

P2g=48.99-14.7

P2g=34.29 psig


2. Four hundred cubic centimeters of gas at a pressure of 740 mmHg absolute and temperature of 18 degree C undergoes a process until the pressure and temperature becomes 760 mmHg abso…

IMPORTANT: Email Subscriptions

I'm very glad about the response of the visitors of this blog. In it's 7th Month now, Mechanical Engineering Blog Site already have 96 email subscription requests! This can only mean one thing--that the visitors are interested on the future contents of this site. The sad news though is that only 64 out of those 96 subscriptions (67 percent) are active. The remaining 32 requests are in the state of "pending confirmation".



To be able to get an email notification from this website, you need to ACTIVATE your subscription. To do this, you have to go to your email address (that you used to subscribe) and open the message from FeedBurner. Click on the link provided to verify your subscription. That email is automatically sent to your inboxes immediately after your subscription. If you cannot find it there, check your spam folders.



Question: What if I already deleted the email without activating my account?
Answer: The BEST thing you can do is to resubscribe. Enter again you…

PAST BOARD EXAM QUESTION:POWER SET-I (ANSWERS)

Below are the answers to the question on the POWER Set-I Questions taken from prevous engineering board examination.

1. An automobile tire is inflated to 32psig pressure at 50 degree F. After being driven, the temperature rises to 75 degree F. Determine the final gage pressure assuming the volume remains constant. (Electrical Engineering Board Exam Problem)
a. 34.3psig



2. Four hundred cubic centimeters of gas at a pressure of 740 mmHg absolute and temperature of 18 degree C undergoes a process until the pressure and temperature becomes 760 mmHg absolute and 0 degrees C respectively. Calculate the final volume of the gas. (Electrical Engineering Board Exam Problem)
c. 365 cc

PAST BOARD EXAM QUESTIONS: POWER SET-1

I have put here part of my compilation of past board examination on the subject Industrial and Power Plant Engineering. These questions are modified for the purpose of improvement. Answers (and probably solutions) will be posted here soon.

1. An automobile tire is inflated to 32psig pressure at 50 degree F. After being driven, the temperature rises to 75 degree F. Determine the final gage pressure assuming the volume remains constant. (Electrical Engineering Board Exam Problem)
a. 34.3psig
b. 49 psig
c. 19.6 psig
d. 32.3 psig




2. Four hundred cubic centimeters of gas at a pressure of 740 mmHg absolute and temperature of 18 degree C undergoes a process until the pressure and temperature becomes 760 mmHg absolute and 0 degrees C respectively. Calculate the final volume of the gas. (Electrical Engineering Board Exam Problem)
a. 351 cc
b. 371 cc
c. 365 cc
d. 375 cc

PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1 (solutions and answers)

The following are the solutions and answers to MODIFIED PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1 posted on this blog last Saturday, November 14, 2009.




Again, I want to stress out that most of the questions here are modified from its original form for the purpose of improving the question.

Past Mechanical Engineering Board Exam Question Number 1
A 4 inches diameter short shaft carrying 2 pulleys close to the bearings transmits how much horsepower if the shaft makes 120 rpm.

A.200HP               B. 199 HP

C.198 HP              D. 202 HP

P = (D3N )/38 -- for mula for short shafts from PSME code

P = (4)3(120)/38

P= 202 HP

Past Mechanical Engineering Board Exam Question Number 2
An instrument that measures the hardness of the work piece in terms of elasticity.

a. Durometer

b. Scleroscope

c. Mohs's Scale

d. Brinell Tester

Source: Machinery’s Handbook

Free Software For Mechanical Engineers

In line with the goal of to share informations that can help our fellow mechanical engineers, I wrote this article about free softwares that can be very useful.




Free CAD softwares

Co-Create
It was first developed by Hewlett-Packard Mechanical Design Division and acquired by Parametric Technology Corporation (maker of Pro-Engineering Software) on late 2007. It offers FREE personal edition that can be downloaded on its website. All you have to do is to register with a valid email address.
Link to the download page.

Alibre
Alibre Inc., offers a FREE light version of their commercial CAD software. Just sign-up using a valid email adress to download the installer.
Link to download page.

T-Flex
Top Systems, a Russian developer of CAD/CAD/CAE/PDM solutions offers a student version of their commercial CAD package T-Flex for FREE.
Link to Download page.




Mind Mapping software

Free Mind
Sourceforge, an organization promoting open-source sofwares created Freemind, a mind mapping software. This can be us…

PAST MECHANICAL BOARD EXAM QUESTION: Machine Design Set-1

The questions below are BASED on the past board examinations given by the board of mechanical engineering. Also, please take note that some of the questions are intentionally varied for the purpose of improving them. Answers (and probably the solutions) will be given a few days after.



Past Mechanical Engineering Board Exam Question Number 1
A 4 inches diameter short shaft carrying 2 pulleys close to the bearings transmits how much horsepower if the shaft makes 120 rpm.
A.200HP             B. 199 HP
C.198 HP            D. 202 HP

Past Mechanical Engineering Board Exam Question Number 2
An instrument that measures the hardness of the workpiece in terms of elasticity.
a. Durometer
b. Scleroscope
c. Mohs's Scale
d. Brinell Tester

Past Mechanical Engineering Board Exam Question Number 3
A cylindrical tank with 15 in inside diameter contains oxygen gas at 3000 psi. Calculate the required wall thickness in (mm) under stress of 25,000 psi.
A.11.44mm               B. 22.86mm
C.15.36mm         …

ME LAWS: REPUBLIC ACT 8495 Part 5 (Article V)

ARTICLE V

PENAL AND CONCLUDING PROVISIONS

Sec. 42. Penalties. – In addition to the administrative sanctions imposed under this Act any person who violates any of the provisions of this Act and its rules and regulations shall, upon conviction be penalized by a fine of not less than Fifty thousand pesos (P50,000.00) nor more than Two hundred thousand pesos (P200,000.00), or imprisonment of not less than six (6) months nor more than three (3) years, or both fine and imprisonment at the discretion of the court.

Section 43. Implementing Rules and Regulations. – The Board shall formulate and issue the implementing rules and regulations to carry out the provisions of this Act.




Section 44. Funding Provisions. – Such sums may be necessary to carry out provisions of this Act shall be included in the General Appropriations Act of the year following its enactment into law and thereafter.


Section 45. Separability Clause. – If any section or portion of this Act shall be declared unconstitutional or inv…

ME LAWS: REPUBLIC ACT 8495 Part 4 (Article IV)

ARTICLE IV
PRACTICE OF THE PROFESSION
Section 33. Field of Action Authorized for Each Category: Prohibition. – It shall be unlawful for any person, unless authorized under this Act:







(a) to be in responsible charge of the preparation of plans, designs, investigations, valuation, technical reports, specifications, project studies or estimates or to be in performance of other professional mechanical engineering activities unless he is a duly licensed Professional Mechanical Engineer.

(b) to teach professional subjects in mechanical engineering course unless he is a duly licensed Professional Mechanical Engineer, or a Master's degree, or Doctorate degree holder in mechanical engineering.

(c) to be in responsible charge of the construction, erection, installation, alteration, or of the performance of a mechanical engineering service in connection with the manufacture, sale, supply or distribution of any mechanical works, project or plant either for himself or for other, unless he is a du…

ME LAWS: REPUBLIC ACT 8495 Part 3 (Article III)

ARTICLE III
EXAMINATION, REGISTRATION AND LICENSE

Sec. 12. Examination Required. – All applicants for registration for the practice of mechanical engineering shall be required to undergo and pass a written technical examination as provided for in this Act.




Section 13. Categories. – Certificates of registration for the practice of mechanical engineering shall be of three (3) categories and in order of rank as follows:

(a) Professional Mechanical Engineer;

(b) Mechanical Engineer; and

(c) Certified Plant Mechanic.

Section 14. Qualification of Applicants for Professional Mechanical Engineer. – Any applicant to the Professional mechanical engineering examination must, at the time of filing of his application, establish to the satisfaction of the Board that:

(a) He is a citizen of the Philippines;

(b) He must not have been convicted by a court of law of a crime involving moral turpitude;

(c) He has a valid certificate of registration and he is a registered mechanical engineer and a holder of …

ME LAWS: REPUBLIC ACT 8495 Part 2 (Article II)

ARTICLE II
BOARD OF MECHANICAL ENGINEERING
Sec. 4. Creation and Composition of the Board of Mechanical Engineering. – There is hereby created a Board of Mechanical Engineering, hereinafter called the Board, to be composed of a Chairman and two (2) members to be appointed by the President of the Philippines from a list of three (3) recommendees for each position, chosen, ranked in the order of preference and submitted by the Professional Regulation Commission, hereinafter referred to as the Commission, from a list of five nominees submitted by the duly accredited association of mechanical engineers in the Philippines. The Board shall be organized not later than six (6) months from the effectivity of this Act.




Section 5. Qualification of Members of theBoard. – A member of the Board shall, at the time of his appointment, possess the following qualifications:

(a) Natural born citizen and resident of the Philippines;

(b) Must be at least thirty-five (35) years of age;

(c) Holder of the degre…

ME LAWS: REPUBLIC ACT 8495 Part 1 (Article I)

Just a refresher for anyone who might not be familiar with the law that governs the practice of Mechanical Engineering in the Philippines.


Republic of the Philippines
Congress of the Philippines

Metro Manila

Tenth Congress

February 12, 1998


Republic Act No. 8495

AN ACT REGULATING THE PRACTICE OF MECHANICAL ENGINEERING IN THE PHILIPPINES

Be it enacted by the Senate and House of Representatives of the Philippines in Congress assembled::



ARTICLE I


TITLE, STATEMENT OF POLICY AND DEFINITION OF TERMS


Section 1. Title. – This Act stall be known as the "Philippine Mechanical Engineering Act of 1998."

Section 2. Statement of Policy. – The State recognizes the importance of mechanical engineers in nation building and development. Their talents through sustainable human development shall be promoted. Thus, the State shall develop and nurture competent, virtuous, productive and well-rounded mechanical engineers whose standard of professional practice and service shall be excellent, qualitati…

Mechanical Engineering REVIEW CENTERS in the Philippines

The following are the addresses and contact numbers of some review centers in Metro manila and Cebu City offering review classes in Mechanical Engineering.



Alcorcon Engineering Review Center-Manila

4th Floor, Anacleta Building, 891 Galicia Street, Corner Espana Blvd., Sampaloc, Manila

Tel No. (02) 742-5600


Alcorcon Engineering Review Center - Cebu

4th Floor, Villa Campa-Capuras Building, Sanciangko Street, Cebu City

Tel No. (032) 254-3384




Linx Engineering Review Center

2nd Floor CMFFI Old Bldg., 815 R. Papa St., Sampaloc, Manila

tel No. 7368670


CDTC Review Center

Dona Amparo Bldg, G. Tolentino St, cor Espana Blvd., Sampaloc, Manila


MERIT Review Center

2nd Floor, San Jose Bldg. Cor. Espana & P. Campa Sts., Sampaloc, Metro Manila


Prime Review Center

Rm 401-404 GMT Bldg., cor Junquera and P. Del Rosario Sts.,Cebu City

tel No.(032) 416-8175




maps courtesy of www.openstreetmap.org

CHOOSING A USEFUL PROJECT STUDY

Most universities and colleges in the Philippines are requiring students to conduct a final project study or thesis before they could graduate. For mechanical engineering students, however, one of the common trends is to design a machine and prototype it. Well, there’s nothing wrong about prototype projects. But what usually happen is the machine ends up in the warehouse. Rusting and decaying. The project that the students have invested in a lot of time, money and effort just ended up useless.




Well, if you’re intention is just to pass the subject, well maybe you don’t have to think about it. But if you want to have a project that will make you graduate and at the same time can be very useful, think more ideas.

There are some tips on how to have a useful project study.
Image via Wikipedia

Tip #1
A utility machine that can be used in the school

Yes, the most practical thing is to design something that will benefit the university. A good example is with regards to waste management design, …

Mechanical Engineer Board Exam Result October 2009

The professional Regulations comission (PRC) announces, after only one working day, the results of October 2009 Mechanical Engineering Board Examination. Out of 2322 examinees, roughly 60.5% or 1404 passed the said examination.This is by far, one of the highest passing percentages in the history of mechanical engineer board exam.




The following are the list of examinees who garnered the 10 highest scores.

1. Radino Encaya Estoria, Technological University of the Philippines (TUP-Manila) - 89.35%
2. Cesar Minorias Baron Jr, University of Cebu - 88.80%
3. Marcelo Casquejo Santillan, Bicol University - Legazpi - 88.55%
4. Mark Cecil Mirasol Tano, Cebu Institute of Technology - 87.80%
5. Christopher Magnaye Requinto, Batangas State University- Batangas City - 87.75%
6. Dale Bryan Raiz Pacheco, Mindanao State University - Iligan Institute of Technology - 87.40%
7. Christopher Beunavente Sanchez, Bicol University - Legazpi - 87.20%
8. Jan Derrick Hernandez Nidar, University of the Philippine…

Mechanical Engineering Board Exam Questions Part 4

Source: Machinery's Handbook
Topic: Materials and Processes




1.______is a number indicating how many times a certain volume of a material is heavier than an equal volume of water
a.specific ratio
b.density
c.Specific gravity
d.Avogadro's Number

2._______an instrument for determining the density of liquids, provided with graduations made to an arbitrary scale
a.hygrometer
b.hydrometer
c.weighing scale
d.sphygmomanometer

3. Stainless steels generally contain at least _______ chromium, with or without other elements
a.40%
b.30%
c.20%
d.10%

4.______ is type of stainless steel that is nonmagnetic in the annealed condition, although some may become slightly magnetic after cold working
a.austenitic
b.hematite
c.martensitic
d.ferritic

5. ______ grades of stainless steel are always magnetic and contain chromium but no nickel.
a.austenitic
b.hematite
c.martensitic
d.ferritic




6. _______ grades of stainless steel are magnetic and can be hardened by quenching and tempering.
a.austenitic
b.hemati…

Mechanical Engineering Board Exam Questions Part 3

Source: Machinery's Handbook
Topic: Strength of Materials, Springs and Wire Ropes


Answers in RED.

1. These washer type springs can sustain relatively large loads with small deflections, and the loads and deflections can be increased by stacking the springs.
a. Volute springs
b. Torsion bars
c. Belleville
d. Flat springs

2. These springs are often used on army tanks and heavy field artillery, and seldom find additional uses because of their high cost, long production time, difficulties in manufacture, and unavailability of a wide range of materials and sizes
a. Volute springs
b. Torsion bars
c. Belleville
d. Flat springs

3. These springs are often used to overcome operating space limitations in various products such as electric switches and relays.
a. Volute springs
b. Torsion bars
c. Belleville
d. Flat springs

4.The ______ of a wire rope is the direction of the helical path in which the strands are laid and, similarly, the lay of a strand is the direction of the helical path in which …

Mechanical Engineering Board Exam Questions Part 2

Mechanical Board Exam Questions from Machinery's Handbook.
Topic: Machine Design : Strength of Materials


1.______ is the amount by which a dimension of a body changes when the body is subjected to a load, divided by the original value of the dimension
a. stress
b. unit strain
c. modulus of resilience
d. modulus of elasticity

2.______is the maximum stress to which a test specimen may be subjected and still
return to its original length upon release of the load.
a. elastic limit
b. rupture point
c. yield point
d. elastic limit

3. _______ is the ratio of unit stress to unit strain within the proportional limit of a material in tension or compression.
a. Modulus of Elasticity
b. Modulus of Resilience
c. Strain
d. unit strain

4._______is the ratio of lateral strain to longitudinal strain for a given material
subjected to uniform longitudinal stresses within the proportional limit.
a. Poisson's ratio
b. unit stress
c. strain
d. Young's modulus of elasticity

5._______is the maximum st…

PROBLEM SOLVING TECHNIQUE—Root Cause Analysis

During college, we solve a lot of problems. Mathematics, physics, machine design and thermodynamics were just a few examples. The good thing about these problems is that usually:


1. All needed information and parameters were given. All you have to do is to solve it using formulas and equations.

2. We are sure that the question has an answer.Image via Wikipedia
3. When you already find the correct answer, the problem is done.

That’s the good thing about solving problems theoretically. But when it comes to the actual work, everything is completely different. Some actual problems in the work are:

PIPING: “the pressure on a particular pipe is usually high”

MANUFACTURING: “the dimension of the parts coming out of the machine is off-spec”

FARMING: “the crops do not yield good fruits.”

EDUCATION: “the students’ score dropped dramatically”

In contrast to college problems, actual work problem are one or all of the following.

1. There’s none or insufficient information or parameters known. The …