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LATEST PRE-BOARD EXAM COMPILATIONENGINEERING SCIENCES AND ALLIED SUBJECTSAUGUST 2012 – JULY 2018WITH QUESTION AND SOLUTIONRIZAL TECHNOLOGICAL UNIVERSITY MAY 2019ENGINEERING SCIENCES AND ALLIED SUBJECTS MARCH ESAS PRE-BOARD EXAM JULY TABLE OF CONTENTS ESAS PRE-BOARD EXAM MARCH ESAS PRE-BOARD EXAM AUG...

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LATEST PRE-BOARD EXAM COMPILATION ENGINEERING SCIENCES AND ALLIED SUBJECTS AUGUST 2012 – JULY 2018

WITH QUESTION AND SOLUTION

RIZAL TECHNOLOGICAL UNIVERSITY MAY 2019

TABLE OF CONTENTS ESAS PRE-BOARD EXAM JULY 2018........................................................................... 2 ESAS PRE-BOARD EXAM MARCH 2018 .................................................................... 17 ESAS PRE-BOARD EXAM AUGUST 2017 .................................................................. 33 ESAS PRE-BOARD EXAM MARCH 2017 .................................................................... 49 ESAS PRE-BOARD EXAM AUGUST 2016 .................................................................. 62 ESAS PRE-BOARD EXAM MARCH 2016 .................................................................... 81 ESAS PRE-BOARD EXAM AUGUST 2015 .................................................................. 95 ESAS PRE-BOARD EXAM MARCH 2015 .................................................................. 115 ESAS PRE-BOARD EXAM AUGUST 2014 ................................................................ 132 ESAS PRE-BOARD EXAM MARCH 2014 .................................................................. 146 ESAS PRE-BOARD EXAM AUGUST 2013 ................................................................ 167 ESAS PRE-BOARD EXAM MARCH 2013 .................................................................. 190 ESAS PRE-BOARD EXAM AUGUST 2012 ................................................................ 213

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

ESAS PRE-BOARD EXAM JULY 2018 1. Mr. Juan dela Cruz drives 120 km at 100km/h and 120 km at 90 km/h. What is the average speed of Mr. dela Cruz on this trip in km/h? A. 93.5 B. 94.7 C. 85.8 D. 82.3 Solution:

120 + 120 = 𝟗𝟒. 𝟕 𝐴𝑣𝑒. 𝑠𝑝𝑒𝑒𝑑 = 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒⁄𝑡𝑖𝑚𝑒 = 120 120 + 100 90

2. In a spreadsheet (EXCEL), the number in cell A2 is set to 2. Then cell B2 is set to A2 x 4 / $A$2, where $ indicates the absolute cell address. This formula is copied into cells C2 and D2. What is the value shown in cell D2? A. 8 B. 2 C. 4 D. 16 Solution: A2 x 4 / $A$2 4∗2= 4 2

B2 x 4 / $A$2 4∗ 2 = 8 4

C2 x 4 / $A$2 8∗

4

2

= 𝟏𝟔

3. What is the MOST nearly effective annual interest rate on a loan if the nominal interest rate is 9% per year compounded quarterly? A. 9.52% B. 9.84% C. 9.68% D. 9.31% Solution:

𝐸𝑅𝐼 = (1 +

𝑟 0.09 )𝑚 – 1 = (1 + )4 – 1 = 0.0931 𝑥 100% = 𝟗. 𝟑𝟏% 𝑚 4

4. Find the amount of P30,000 at 6% simple interest after 5 years. A. P39,000 B. P40,000 C. P41,000 D. P42,000 Solution:

𝐹 = 𝑃 ( 1 + 𝑖𝑛 ) = 30,000 (1 + 0.06𝑥5) = 𝑷𝟑𝟗, 𝟎𝟎𝟎

5. A bar of uniform cross section is subject to a uniaxial tension and develops a strain in the direction of the force 1/800. Calculate the change of volume per unit volume. Assume µ= 1/3. A. 1/2400 (inc) B. 1/2400 (dec) C. 1/1200 (inc) D. 1/1200 (dec) 2

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

Solution: ∆𝑣 = ∈ 𝑎𝑥𝑖𝑎𝑙 (1 − 2𝜇) 𝑣

1 1 𝟏 ∆𝑣 = (1 − 2 ∗ = (𝒊𝒏𝒄) 1800 𝑣 3 𝟐𝟒𝟎𝟎 6. A bank is advertising 9.5 percent account that yield 9.84 percent annually. Find how often interest is compounded. A. Monthly B. Bimonthly C. Quarterly D. Annually 7. Defects seen by optical or electron microscope. A. alteration B. aberration C. atomization

D. deformation

8. NGCP warns ___________ alert if tropical disturbance is expected to make a landfall within 24hrs. A. yellow B. blue C. red D. weather disturbance 9. What is work-in process classified as A. an asset B. a liability

C. an expense

D. owner’s equity

10. It state that if two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. A. first law of thermodynamics C. third law of thermodynamics B. zeroth law of thermodynamics D. second law of thermodynamics 11. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). A. Feeder C. Branch Circuit B. Service lateral D. Service conductor 12. The term “thermodynamics” comes from the Greek words “Therme” and “Dynamis” which means A. heat, power C. heat, transfer B. heat, motion D. heat, energy

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

13. If a refrigerator uses 1.5kJ to cool a 1kJ input. What was the heat transferred to the kitchen? A. 1kJ B. 2kJ C. 0.5kJ D. 2.5kJ Solution: 𝑤 = 𝑄𝐻 – 𝑄𝐿

𝑄𝐻 = 𝑤 + 𝑄𝐿 = 1.5 + 1 = 𝟐. 𝟓𝒌𝑱

14. A mass m is released at a height h, using conservation of energy, find the final velocity of the mass as it hits the ground. A. v = gh B. v= gh/ 2 C. v= √𝟐𝒈𝒉 D. v= √𝑔ℎ

15. A conducting connections, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth. A. Grounded B. Ground C. Short D. Fault 16. An essential part of a large dam and provides an efficient and safe means of releasing flow of water that exceeds the design capacity of the reservoir. A. spillway B. weir C. culverts D. standpipe 17. The maximum bending moment in a simple supported beam of span L and carrying a concentrated load “W” is A. WL B. WL/ 2 C. WL/ 4 D. 2WL 18. MS-DOS is a type of? A. system software B. operating system

C. application software D. system architecture

19. (111) base 2 + (111) base 2 = ( ) base 2. A. 11011 B. 11101 C. 11110

D. 11100

Solution: 1112 + 1112 = ________2 1112 +1112 111102

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

20. The ampacity of the fuse should be 125% of the continuous load current is covered by A. installation design C. manufacturing design B. wiring design D. construction design 21. Steel that are used for axles, gears and similar parts requiring medium to high hardness and high strength are known as A. Low- carbon steels C. High-carbon steels B. Medium-carbon steels D. Very high-carbon steel 22. What will you do when you install a new heat sink? A. Insert thermal compound between processor and system board. B. Apply isopropyl alcohol between processor and heat sink. C. Insert thermal compound between processor and heat sink. D. Apply isopropyl alcohol between processor and system board. 23. Assuming i= annual rate of return, n= number of years, F= future worth, and P= present worth, what is the future worth of a present amount P(F/P, I, n). A. P( 1+ i)n B. P( 1+ i)n-1 C. P( 1+ i)-n D. P( 1+ i)i 24. Which of the following statements is not correct? A. A nominal rate of 12% per annum compounded quarterly is the same as (12%) + 4 = 3% per quarter. B. One dollar compounded quarterly at 3% for n years has a worth of (1.03) 4n dollars. C. Compounding quarterly at a nominal rate of 12% per year is equivalent to compounding annually at a rate of 12.55%. D. Effective rate of return in choices (A) through (C) is the difference between 12.55% and 12%. 25. XYZ Corporation is applying for a short term loan. In reviewing XYZ Corporation’s financial records, bank ABC finds a current ratio of 2.0, an acid test ratio of 0.5, and an account receivable period of 70 days. What should the banker do? I. suggest that XYZ Corporation lower its inventories II. suggest that XYZ Corporation be more aggressive in collecting on its invoices A.I only B. II only C. either I or II D. both I or II 26. The ideal, reversible Carnot cycle involve four basic processes. What type of

5

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

processes are they? A. all isothermal B. all adiabatic

C. two adiabatic and two isentropic D. two isothermal and two isentropic

27. What is the value of A after this program segment is performed? A= 0 DO 77 I = 1, 4 77 A= A + I A. 4

B. 5

C. 8

D. 10

C. CaCl

D. CaCl3

Solution: I= 0 A=0 A= A + I= 0+1 = 1 I= 2 A=1 A= A + I= 1+2 = 3 I=3 A=3 A= A + I= 3+3= 6 I=4 A=6 A= A + I= 6+4= 10 28. Formula for calcium chloride A. CaCl2 B. Ca2Cl

29. Sec.18 (b) of Art. III of RA 7920: Examination and Registration. Qualifications of Applicants for Registered Master Electricians, states that an applicant is at least be ___ years of age. A. 23 B. 22 C. 21 D. 18 30. Sec. 17 (b) of Art. III of RA 7920: Examination and Registration. Qualifications of Applicants for Registered Electrical Engineers, states that an applicant is at least be ___ years of age. A. 21 B. 23 C. 24 D. 25 31. Find MW of HNO3 in g/mole. A. 72 B. 61 Solution:

C. 73 𝐻 = 1𝑥1 = 1

D. 63

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

𝑁 = 14 𝑥 1 = 14 𝑂3 = 16 𝑥 3 = 48

1 + 14 + 48 = 𝟔𝟑

32. What is the chemical formula of Sulfuric acid? A. HSO4 B. H2SO4 C. H3SO2

D. HSO2

33. 1KB is how many bytes? A. 1000 B. 1024

C. 1012

D. 1048

34. What is the unit of strain? A. Pa B. unit less

C. N-m

D. N-m/s

35. Which of the following is an example of an integrity violation of e-commerce security? A. A Website is not actually operated by the entity the customer behaves in to be B. A merchant uses customer information in a manner not intended by the customer C. A customer denies that he or she is the person who placed the order D. An unauthorized person intercepts an online communication and changes its content 36. What is the physical appearance of sodium chloride? A. Silver metal B. White crystal C. Yellowish Gas

D. White metal

37. What is the oxidation number of Cr in the dichromate ion (Cr2O2)-2 ? A. -1 B. 0 C. 2.5 D. 6 2𝑥 + (−14) = −2 Solution:

∴𝑿 = 𝟔

38. A software that is commonly known as firmware. A. OS B. Cache Memory C. BIOS 39. Pulverized fuel is used for A. Better burning B. Less radiation loss

D. IO

C. More calorific value D. Medium sized units

40. An unknown fuel has a mass density of 805 kg/m3. Find its specific gravity. A. 0.805 B. 1.242 C. 1.610 D. 0.621

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

Solution:

𝑆. 𝐺 =

𝜌

𝜌𝐻2𝑂

=

805

1000

= 𝟎. 𝟖𝟎𝟓

𝒌𝒈 𝒎𝟑

41. Which of the following is a variable renewable source of energy? A. Hydro-power C. Biomass Energy B. Geothermal Energy D. Solar Energy 42. Which of the following is a conventional source of energy? A. Coal B. Solar C. Wind

D. Tidal

43. In cold working of metals A. close dimensional tolerance cannot be maintained B. poor surface finish is obtained C. recrystallization temperature for steel is reduced D. strength and hardness of steel is increased 44. An object is dropped from an original height h hitting the ground with velocity v. How much greater will speed hitting the ground be if the object is dropped from a height 4 times the original height? A. 4 times B. 2 times C. √2 times D. 16 times Solution:

𝑉𝑓 = 𝑉𝑜 + 2𝑔ℎ

𝑉2 = 2𝑔ℎ 𝑉22 𝑣12

𝑉22 𝑣12

=

=

2𝑔2 ℎ2 2𝑔1 ℎ1 8

2

=4

√𝑉2 2 = √4 𝑣1 𝑉2

𝑉1

2

=2

𝑽𝟐 = 𝟐𝑽𝟏

45. An inventor clams to extract 100 kJ of energy from 30°C sea water and generate 7 kJ of heat while rejecting 93 kJ to a 10°C stratum. The scheme fails because;

8

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

A. The temperature of the sea water is too low B. It is perpetual-motion machine

C. It violates the first law D. It violates the second law

46. The second period contains how many elements? A. 2 B. 4 C. 6

D.8

47. An isentropic process: A. is adiabatic and reversible B. is reversible but may not be adiabatic

C. is adiabatic but may not be reversible D. is always reversible

48. A driver fills an 18.9 L can with gasoline at 15.0 °C right up to the top. He forgets to replace the cap and leave the can in the back of his truck. The temperature climbs to 30.0°C by 1 PM. How much gasoline spills out of the can? Assume a coefficient of linear expansion of steel to be 12x10-5 K-1 and the coefficient of volumetric expansion of gasoline to be 950 x 10-6 K-1. A. 0.62 L B. 0.26 L C. 0.27 L D. 0.72 L Solution: 49. My Johnson borrows $ 100,000 at 10% effective annual interest. He must pay back the loam over 30 years with uniform monthly payments due on the first day of each month. What does Mr. Johnson pay each month? B. $846 C. $870 D. $884 A. $839 Solution:

𝑖 12 ) 12 𝑖 12 1.10 = (1 + ) 12

𝑖 + 1 = (1 +

𝑖 = 0.007974 12

𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑝𝑎𝑦𝑚𝑒𝑛𝑡𝑠 = 12(30) = 360 𝐵𝑜𝑟𝑟𝑜𝑤𝑒𝑑 𝑚𝑜𝑛𝑒𝑦 = 𝐴 + 𝑃

100,000 = 𝐴 +

𝐴[(1 + 0.007974)359 − 1] (1 + 0.007974)359 (0.007974) 𝐴 = 839

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

50. Air has a specific heat of 1 kJ /kg-K. If BTU of energy is added to 100 g of air, what is the change in air temperature? A. 10.0°C B. 21.1°C C. 44.1°C D. 88.2°C Solution:

𝑄 = 𝑚𝐶𝛥𝑇 𝛥𝑇 =

𝑄

𝑚𝐶

=

= 𝟐𝟏. 𝟏°𝑪

2.11

(0.1)(1)

51. A pump has an efficiency of 65%. It is driven by a 0.75 horsepower motor. The pump produced a pressure rise of 120 Pa in water. What is the required flow rate? A. 3.03 m3/s B. 4.04 m3/s C. 4.55 m3/s D. 4.66 m3/s Solution:

𝑃𝑜𝑢𝑡 = 𝜂𝑃𝑖𝑛 = (0. 65)(0.75 𝑥 746 ) = 363 .675 𝑊 𝑃𝑜𝑢𝑡 = 𝑄𝛾ℎ 𝑏𝑢𝑡 𝛾ℎ = 𝑃 𝑃𝑜𝑢𝑡 = 𝑄𝑃 𝑄=

𝑃𝑜𝑢𝑡 𝑃

=

363.675 120

= 𝟑. 𝟎𝟑 𝒎𝟑/𝒔

52. What is the tensile load if a ½” x 4” x 12” steel tie rod experience an 80°F temperature decrease from the no stress temperature? A. 92,346 lb B. 47,120 lb C. 31,200 lb D. 52,130 lb Solution:

𝑁𝑜𝑡𝑒: 𝑛𝑜 𝑠𝑡𝑟𝑒𝑠𝑠 𝑑𝑢𝑒 𝑡𝑜 𝑡𝑒𝑛𝑠𝑖𝑙𝑒

𝛼 (∆𝑇) =

𝑃 𝐴𝐸

6.5𝑥10−6 (80) =

𝑷 = 𝟑𝟏, 𝟐𝟎𝟎 𝒍𝒃

1

𝑃

(2𝑥4)(30𝑥106 )

53. The rate of return for a ₱10,000 investment that will yield ₱ 1,000 per year for 20 years is closest to A. 2% B. 4% C. 8% D. 16% Solution: 10

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

𝑃 = 𝐴[

(1+𝑖)𝑛 −1 𝑖(1+𝑖)𝑛

]

10,000 = 1000 [ 𝑖(1+𝑖)20 ] (1+𝑖)20 −1

𝑖 = 0.0775 𝑥 100% = 𝟖%

54. The overall energy program formulated and updated yearly by the DOE and submitted to Congress pursuant to R.A. 7638. A. Power Development Plan (PDP) C. Philippine Electrical Code (PEC) B. Philippine Energy Plan (PEP) D. Preliminary Project Planning Data (PPPD) 55. The work of a polytrophic (n=1.21) compression of air (Cp/Cv = 1.4) in a system with moving boundary from P1= 15 psia, V1=1.0 cu.ft. to P2=150 psia, V2=0.15 cu.ft. is. A. 1080 ft-lb B. 5150 ft-lb C. 6882 ft-lb D. 2700 ft-lb Solution:

𝑾=

𝑾=

𝑷𝟐𝑽𝟐 − 𝑷 𝟏𝑽𝟏 𝟏−𝒏

𝟏𝟓𝟎(𝟏𝟒𝟒)(𝟎.𝟏𝟓)−(𝟏𝟓𝒙𝟏𝟒𝟒)(𝟏) 𝟏−𝟏.𝟐𝟏

𝑾 = 𝟓𝟏𝟒𝟐. 𝟖𝟔 𝒇𝒕 − 𝒍𝒃 ≈ 𝟓𝟏𝟓𝟎 𝒇𝒕 − 𝒍𝒃

56. One Newton is equivalent to A. 105 dyne B. 106 dyne

C. 10 7 dyne

57. An adiabatic process with no work done is A. isometric B. throttling C. isobaric

D. 108 dyne D. polytropic

58. Article IV Rule __________. Requirements form examination as a REE. A. 14 B. 15 C. 16 D. 17 59. The phenomenon known as corrosion in metals is by nature A. chemical B. organic C. electrochemical D. electrical 60. A force causing a rise in liquid in tubes of small diameter. A. cohesion B. surface tension C. capillarity

D. adhesion

61. Also known as PRC Renewal Law. A. RA 8189 B. RA 8981

D. RA 184

C. RA 7920

62. A price tag of ₱1,200 is payable in 60 days but if paid within 30 days it will have a 3 percent discount. Find the rate of interest. 11

REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

A. 36.33 percent B. 36.12 percent

C. 37.66 percent

D. 37.11 percent

Solution:

𝐼 = 𝑃𝑖𝑛

(1200)(0. 03) = 1200 (1 − 0.03) (𝑖) ( ) 360 30

𝑰 = 𝟑𝟕. 𝟏𝟏 %

63. A projectile leaves a velocity of 50 m/s at an angle of 30 degrees with the horizontal. Find the maximum height that it could reach. A. 28.46 m B. 31.86 m C. 41.26 m D. 51.26 m Solution:

𝐻 =

(𝑉𝑜𝑆𝑖𝑛𝜃) 2𝑔

2

𝐻 =

((50)(𝑆𝑖𝑛30))2 2(9.81)

𝑯 = 𝟑𝟏. 𝟖𝟔 𝒎

64. The majority of the rocks in the Earth’s crust are: A. igneous B. metamorphic C. Sedimentary

D. volcanic

65. The zone of the atmospheric in which weather occurs is known as the A. ionosphere B. mesosphere C. troposphere D. stratosphere 66. What is another term for modulus of elasticity? A. Bulk modulus C. Constant of elongation B. Shear strain D. Young’s modulus 67. What do you call earth and stone mixed with the iron oxide? A. Hematite B. Magnetite C. Grangue

D. Ore

68. Which light contains wavelengths of all or nearly colors? A. White Light B. Laser C. X-ray

D.Gamma rays

69. A 10-mm diameter brass rod has a modulus of elasticity of E=100 GPa. If it is 4 m long and subjected to an axial tensile load of 6KN, determine its elongation. A. 3.06mm B. 3.60m C. 2.34mm D. 2.43mm

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REGISTERED ELECTRICAL ENGINEERS PRE-BOARD EXAMINATION JULY 2018 ENGINEERING SCIENCES AND ALLIED SUBJECTS

Solution:

𝑆 =

(6𝑥103 )(4)

10 𝜋 ( )(1000)2 (100𝑥109 ) 4

𝑆 =

𝜌𝐿 𝐴𝐸

𝑺 = 𝟑. 𝟎𝟔 𝒎𝒎

70. RA 7920, Rule 2(n), defining ? A. DECS B. Syllabi

C. Board

D. CHED

71. What rules are included in article V of RA 7920? A. RULE 11 to 20 B. RULE 28 to 34 C.RULE 21 to 27

D.RULE1 to 20

72. In the case of a regenerative gas turbine engine, which of the following is false? A. The regenerator improves the efficiency of the engine B. The amount of energy required during combustion is less than that required in a similar gas turbine if the power is constant. C. The exit temperature of the regenerator is higher than the inlet temperature of the compressor. D. There is no heat rejected to the atmosphere in a regenerative gas turbine engine. 73. When exposed to the atmosphere, which of the following liquids is coldest? A. Oxygen B. Argon C. Nitrogen D. Helium 74. What is the temperature rating of a TW insulated conductor? A. 60 deg C B. 75 deg C C. 90 deg C 75. The brain of any computer system is A. ALU B. Memory C. CPU

D. 100 deg C

D.Control Unit

76. Electrical symbol represented by a solid line A. intercom wiring B. telephone wiring C. conduit

D.service entrance

77. A storage system for small amounts of data is A. magnetic card B.magnetic tape C.Punched card D.Optical mark reader 78. The place where buyers and sellers come together A. Market B. Business center C.Recreation center D.Buy and sell section 79. Which is m...