JANUARY 1999 BOARD EXAMINATION 1

Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)

INSTRUCTION: Select the correct answer for each of the following questions. Mark only one answer for each item by
marking the box corresponding to the letter of your choice on the answer sheet provided. STRICTLY NO ERASURES
ALLOWED. Use pencil no. 1 only.

MULTIPLE CHOICE:

1. Given Figure BO 03.99-02. Figure shows a riser diagram of a Telephone Entrance Cable Facility for a simple building.
What is the part of the facility, which accepts the house cable riser and houses the terminal block at each floor and at the
highest or end of a feeder/riser cable as maybe seen in No. 2 of the figure. Identify this part of the facility.
A. Telephone Terminal Cabinet C. Telephone Floor Panel
B. Floor Load Center D. Floor Distribution Panel

2. What is the simplest type of building automation system, which intercoms, PABX, microwave links, analog and digital
telephone systems, video conferencing, satellite links, structured cabling and similar devices?
A. Telecommunication system C. Conveyance system
B. Cable management system D. Information system

3. It is customary that a full open type of valve is used in several locations in a water distribution system. Which location in
the following list DOES NOT require one?
A. On every hose bibb
B. On water supplies to pressurized tank
C. On the water service pipe near the source connection
D. On the main water distribution pipe near the water service

4. What is a fire line system without a constant water supply and is equipped with a fire service inlet and outlet connection
and installed exclusively for the use of the Fire Service?
A. Fire Department House Connection C. Dry Standpipe
B. Combination Standpipe D. Wet Standpipe

5. The term used to the main water pipe delivering potable water to a building is called
A. Water service pipe C. Main pipe
B. NAWASA D. Water utility pipe

6. In a water system with constant water supply supplying series of plumbing fixtures, water supply drop is experience when
the fixtures in the series are simultaneously opened. Which poor design in the plumbing system causes this?
A. Choice in the system of water distribution
B. Insufficiency in the size of the water service and distribution pipe
C. Too many fixtures opened simultaneously
D. Use of PVC or other plastic pipes

7. What is the minimum size of a trap or branch of a residential kitchen?

A. 1 1/2” C. 1 1/4”
B. 1 3/4” D. 2”

8. What is the minimum size of a trap or branch for a lavatory?

A. 1 1/4” C. 1 1/2”
B. 1 3/4” D. 2”

9. The standard size of an outlet of a dry standpipe located for each floor is ___mm. diameter.
A. 51 mm (2”) C. 38 mm (1 1/2”)
B. 76 mm (3”) D. 64 mm (2 1/2”)

10. Which criterion is NOT needed in sizing a vent pipe for individual, branch and circuit vent based on the total linear
footage of the pipe making up the vent?
A. Developed length of the vent pipe C. Slope of the drain pipe
B. Number of fixture unit D. Size of the drain pipe
JANUARY 1999 BOARD EXAMINATION 2
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
11. Given Figure BO 02, 77. Hot and cold water supply pipes meets at location 2 in order to mix manually the desired
water temperature and directs the mixed water either at the shower head or at the foot spout. What concealed assembly is
installed at this location?
A. 3-way valve diverter C. Telephone-type shower valve
B. 1/2” shower valves D. 3 sets gate valves

12. Single lever valves used in kitchen sink and lavatory faucets or at shower valves has gain popularity in plumbing
installation today. This is because these valves are beautiful and are maintenance-free. These valves work by the principle
of a:
A. gate valve C. ball valve
B. angle valve D. globe valve

13. Minimum water delivery in liters per minute for an outlet of a wet standpipe at a residual pressure or 1.8 kilos per sq.
mts.
A. 132 liters per minute C. 155 liters per minute
B. 112 liters per minute D. 126 liters per minute

14. A female GI threaded pipe reducer fitting use to connect a reducing branch pipe at an angle.
A. Elbow reducer C. Coupling reducer
B. Bushing reducer D. Tee reducer

15. Given Figure BO . 99-01. Figure shows a set plumbing fittings. What is the general term used to describe this set of
fittings?
A. American Standard fittings C. Plush valve fittings
B. Overhead tank fittings D. Water closet tank fittings

16. Given Figure BO 02.84. The Figure shows the Soil, Waste and Vent Piping on plan layout. What CI fitting is installed
at location 12 as indicated, use to accept the P-trap assembly of the lavatory?
A. 2” Sanitary Tee C. 2” Tapped Tee
B. 2” Tee D. 2” Wye and 2 x 1/8 bend combination

17. What is a type of vent applied on installations with multi-branch interval where the vertical vent pipe takes off in front
of the first fixture and connects to a main vent stack?
A. Relief vent C. Loop vent
B. Yoke vent D. Circuit vent

18. Water as delivered by NAWASA is no longer safe for drinking because of several contaminants from the water source
present in the environment. It is now therefore imperative that water to be safe for drinking has to undergo water
purification in several stages. Because of several contaminants, water undergoes several stages. What is a stage in water
purification, which removes mineral deposits, salts, heavy metal, totally dissolves solids while some useful minerals are
retained?
A. carbon filtration C. ultraviolet radiation
B. aeration D. reverse osmosis

19. Plan 02.21 shows the floor plan of a 9-storey office building showing the plumbing fixture layout and the location of
the stack at the pipe chase. The building’s floor to floor height is 3.00 meters. Using the tables provided, what is the size
to the horizontal branch nearest the soil stack at the 5th floor if the branch uses a 1/2” of fall per foot?
A. 5 inches C. 6 inches
B. 3 inches D. 4 inches

20. What type of fire detector installed in a fire alarm system, which uses low melting point solders or metal that expands
when exposed to heat to detect a fire? Such a detector is rated detecting heat between 135 to 197 degrees Fahrenheit to
send a signal for fire mitigation.
A. Photoelectric detector C. Fixed temperature heat detector
B. Rate of rise heat detector D. Infrared flame detector

21. Plan 02.21 shows the floor plan of a 9-storey office building showing the plumbing fixture layout and the location of
JANUARY 1999 BOARD EXAMINATION 3
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
the soil and vent stack of the pipe chase. The building’s floor to floor height is 3.00 meters. Using the table provided,
what is the size of the main vent stack if all the fixtures connect to it?
A. 3 inch diameter C. 6 inch diameter
B. 5 inch diameter D. 4 inch diameter

22. What is a GI fitting to join two threaded fittings as close as possible but not exceeding 3 inches?
A. Nipple C. Union
B. None of the three D. Coupling

23. A device used to control an incoming high water pressure into the water distribution system by mechanical means so
as to bring it to a working pressure of 80 psi.
A. Pressure relief valve C. Pressure reducing valve
B. Pressure reducer D. Pressure regulator

24. A slow draining of water from a fixture down a plumbing system indicates a poor venting system. This poor venting
system is caused by:
A. Over loaded fixture unit in the soil stack C. Wrong choice of vent type
B. Change in the atmospheric pressure in the pipe D. Inadequate drain pipe

25. A type of pump for driven well from 150 ft to 200 ft which works by a principle of venturi where water of high
pressure is pump into the well to draw water upwards through the return pipe.
A. submersible pump C. jack or piston pump
B. jet pump D. reciprocating pump

26. Which of the following locations DO NOT require installation of a clean out?
A. At every branch interval of a soil stack
B. Any horizontal waste or soil pipe exceeding 15 meters
C. Any change in direction of a soil branch 22.5 degrees and over
D. At every end of every soil branch

27. Which in the list is NOT a standard commercial size of GI pipe for water supply?
A. 2 1/2” diameter C. 4” diameter
B. 3” diameter D. 5” diameter

28. Given Figure BO 02.99-07. This device is a control valve, which works by discharging instantaneous volume of water
at higher pressure. Identify this device.
A. Water closet tank assembly fittings C. Water closet flush
B. Urinal flush valve assembly D. Overhead tank pressure control valves

29. A term used for a pipe extension of not more than 2 feet in length, installed at any stack or branch of a plumbing
rough-in for the purpose future tap.
A. tail piece C. clean out
B. branch D. stub out

30. In a water distribution system, locations such as supply pipe to every water heater requires a full open valve. Which of
the following in the list is a full open valve?
A. check valve C. globe valve
B. ball valves D. angle valve

31. A residence with 12 family members requires 3.6 cu. meters of cold water daily with peak demand. What is the
maximum hot water probable hourly demand?
A. 110 liters C. 120 liters
B. 100 liters D. 140 liters

32. What is a type of Parking Management System, which may use two types of vehicular deterrent either articulated arm
type or straight beam type? This system may either be activated by means of a radio frequency remote control, push
button switch, photo cell, magnetic loop or access control readers to remove such deterrent along the path of the vehicle.
JANUARY 1999 BOARD EXAMINATION 4
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
In more sophisticated system, this may use interlinked computers for data information and processing. Figure BO 04.99-
01 illustrates this type of Parking Management System. Identify this type of parking management system.
A. Automated Barrier system C. Automated Gate system
B. Automated Roll-up and Roll-down door system D. Automated retractable pillar system
JANUARY 1999 BOARD EXAMINATION 5
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
33. It is customary that each fixture requires a trap. An exception allows the fixtures in a series of washbasins, laundry
trays, or sinks maybe interconnected to a single trap. How many fixtures are allowed to be interconnected to a single trap?
A. Two C. Three
B. Five D. Four

34. The presence of a Fire Service Connection represents that the fire fighting systems of a building is equipped with a:
A. Dry standpipe C. Wet standpipe
B. Automated sprinkler system D. Fire pump

35. What is the general term applied to the pipes and fittings, which can exclusively be used for cold water lines for
potable main distribution water service, sprinkler and irrigation system? The pipes and fittings come in standard sizes of
1/2”, 3/4”, 1”, 1-1/4” 1-1/2” and 2” in diameter. The pipe comes in coil or roll. It is manufactured in black and passes
ASTM D3309 and ISO 161/1.
A. Polythelyne pipes and fittings C. Plastic Extrusion pipes and fittings
B. Polyethylene pipes and fittings D. Polybutylene pipes and fittings

36. In Figure BO 01.99-1 G shows uPVC pipes and fittings of sizes of 2”, 3” and 4” diameters. Pipes come in standard
lengths of 3 meters. The pipes and fittings come in standard color of orange brown and passes ASTM 2729 standards.
What is the general term used to these pipes and fittings?
A. uPVC plumbing pipes and fittings C. Gravity sewer main uPVC pipes and fittings
B. uPVC drainage and sewer spiral pipes D. UPVC DWV Sanitary pipes and fittings

37. Which of the following pipes is least popular and NOT recommended for use as potable water distribution pipe?
A. Galvanized steel pipes C. UPVC pipes
B. Asbestos pipes D. PB pipes

38. Given Figure BO 02.99-01 E. Figure shows a shower set for bath. What is the common term for this shower set?
A. Single lever bath faucet with hand shower – Telephone shower
B. Single lever three way diverter with spout and shower
C. Single lever two way diverter with spout and shower
D. Shower valve

39. Given Figure BO 02.99-04. The following are different types of faucets for different purposes. A lavatory a 4” center
top is to be installed with a faucet. Which of the following matches the lavatory?
A. 5 C. 2
B. 4 D. 1

40. Plumbing fixtures and mechanical equipment that have water supply are required to have a cut-off valve installed in
the service piping. Which of the following is a cut-off valve?
A. Globe valve C. Ball valve
B. None of the three D. Gate valve

41. What is the minimum size of a wet standpipe for a riser of more than 15 meters from the source?
A. 102 mm (4”) diameter C. 51 mm (2”) diameter
B. 64 mm (2-1/2”) diameter D. 76 mm (3”) diameter

42. Which of the following pipes is NOT used as water service pipe?
A. Fiber cement pipes C. PB pipes
B. Galvanized steel pipes D. UPVC pipes

43. The minimum height of a dry standpipe outlet from the floor line is:
A. 61 cms. C. 68 cms.
B. 73 cms. D. 55 cms.

44. Water hammering is most prevalent around quick-closing valves such as ball cocks and washing machine valves.
What device is used to prevent water hammering by diminishing the water force present in the water distribution system
by installing the device close to the supply pipe of a fixture or in long straight run?
JANUARY 1999 BOARD EXAMINATION 6
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
A. Air chamber C. Pressure relief valve
B. Pressure regulator D. Air volume control

45. A rule of thumb in sizing an individual vent:

A. Vent size is at least 1/2 the fixture unit but not less the required minimum whichever is larger.
B. Vent size is at least 1/2 the drain it serves but not less than the required minimum whichever is larger.
C. Vent size is at least equal to the branch or trap diameter it serves whichever is smaller but not less than the required
minimum whichever is larger.
D. Vent size is at least 1/2 the developed length of the stack it vents but not less than the required minimum whichever is
larger.

46. What mechanical equipment, coupled with a central airconditioning system, is used to dehumidify and cool the
airstream injected into the conditioned space?
A. Fan coil unit C. Evaporator
B. Air handling unit D. Chiller unit

47. Figure BO 05.15 shows a diagram of a central airconditioning system. Identify component part No. 6.
A. Fan coil unit C. Evaporator
B. Condenser unit D. Chiller unit

48. When providing space for elevator landing for a single bank, as a general rule for non-residential buildings such as
offices, hotels and hospitals, the floor landing fronting the elevator should at least be:
A. 1.3 times more than the elevator car depth C. 1.7 times more than the elevator car depth
B. 1.5 times more than the elevator car depth D. twice times more than the elevator car depth

49. A type of elevator control system that enables recording calls from landings even when the car is in use. When the car
is free or running down, it answers calls starting from the highest floor, and so on while descending. When the car is in
use and running up calls will be satisfied once the ascending ride is over and car lowers. From the inside the car, controls
are memorized and executed in sequence order, both rising and lowering.
A. Collective selective control, in two directions C. Up collective control
B. Down collective control

50. Given figure BO 06.90, identify the location of the Step chain safety.
A. No. 6 C. No. 1
B. No. 8 D. No. 5

51. A type of control system of an elevator that enables recording calls from landing even when the car is in use. When
the car is free or running up, it answers calls starting from the lowest floor, and so on while ascending. When the car is in
use and running down calls will be satisfied once the descending ride is over and car moves up. From the inside the car,
controls are memorized and executed in sequence order both rising and lowering.
A. Single push button control C. Collective selective control, in two directions
B. Up Collective control D. Down collective control

52. A safety device of a passenger elevator which activates if the car travels faster than its rated speed by grasping the
guide rail to stop the car safely.
A. Safety gear C. Safety Shoe
B. Magnetic brake D. Governor

53. Figure BI 05.35 shows a cross-sectional view of a portable gas fired water boiler showing its major component parts.
Identify part No. 8.
A. Volt control C. Heat exchangers
B. Burner trays D. Refractory panel

54. When planning a multiple system of elevator layout where 4 or more elevators are arranged in banks, the bank should
be arranged:
A. back against back C. side by side
B. right angle to each other (L shaped) D. one in front of the other
JANUARY 1999 BOARD EXAMINATION 7
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
55. The nominal size of an escalator, a measurement of the escalator’s width like those of the Japanese brand is:
A. 1120 mm C. 980 mm
B. 800 mm D. 760 mm

56. Given BO 06.97, identify escalator part no. 5.

A. Main drive chain C. Handrail drive chain
B. Step chain D. Bottom sprocket chain

57. In the following list are the standard speeds of electric traction type passenger elevators for low to medium rise
buildings. Which in the list is NOT a standard speed?
A. 75 meters per minute C. 60 meters per minute
B. 90 meters per minute D. 105 meters per minute

58. What type of dampers is installed at supply ducts, which are electro-mechanically activated by a building automation
system to close in case of a detected fire within the area?
A. Smoke dampers C. Adjustable locking dampers
B. Batterfly valve dampers D. Balancing dampers

59. Figure BO 05.01 shows a typical refrigeration cooling cycle. Identify which among the tubing contains cool
refrigerant vapor.
A. No. 6 C. No. 7
B. No. 5 D. No. 8

60. What general rule is used as a guide for an initial estimate per Ton of Refrigeration (TR) per sq. mts? Of a standard
room of normal condition without external solar heat gain and excessive internal heat gain? It is on the understanding that
further heat gain calculation is needed for a precise capacity.
A. 16 to 18 sq. mt. per TR C. 12 to 14 sq. mt. per TR
B. 25 to 27 sq. mt. per TR D. 30 to 34 sq. mt. per TR

61. The nominal size of an escalator, a measurement of the escalator’s step like those of the Japanese brand is:
A. 1150 mm C. 900 mm
B. 1100 mm D. 1000 mm

62. As per International Standard and EN 81.1 code, the following are the standard criteria for the design of a machine
room of an electric passenger elevator. Which in the list is inconsistent to the code?
A. Piping or duct belonging to other system should not run through the machine room.
B. Opening between the machine room and the shaft must be fully opened to allow easy access.
C. Ventilation must be sufficient to maintain an indoor temperature between 5 to 40 degrees centigrade. Otherwise
mechanical means of ventilation or airconditioning shall be installed.
D. Only the hoist machine-motor assembly and control panel and auxiliary equipment for fire fighting and detectors are
allowed inside.

63. The standard installation for escalator not exceeding 4.50 meters floor to floor height or supported at two points,
where the escalator’s truss abut to the structural beam supporting the escalator is:
A. The side of the escalator’s truss is bolted to the size face of the building’s structural beam.
B. The top chord of the truss is with a steel angle.
C. A sub beam supports the bottom chord of the escalator’s truss.
D. The bottom chord of the truss is resting on a corbel of the building’s structural beam.

64. The location of the control system or the “computer brain” of the escalator is:
A. at the machine room at the lowest floor C. adjacent to the drive motor
B. at the escalator machine room D. at the machine room at the highest floor

65. The main purpose of the pit of the elevator shaft is to allow a space for the:
A. car’s over-run C. car to be stalled for maintenance
B. car buffer and idler sheave D. counter weight and buffer
JANUARY 1999 BOARD EXAMINATION 8
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
JANUARY 1999 BOARD EXAMINATION 9
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
66. Given Figure BO 05.99092 diagram the parts of an electric instantaneous water heater. In a non-centralized hot water
supply system, this type of water heater can easily retrofit by simple installation. Part no. 12 is a built-in safety feature
which operates the heater only when there is sufficient flow of water; saving energy by turning heater on only when the
unit is in operation, at the same time acts as safety device preventing burn-out caused by insufficient water flow. What is
this vital part of this instantaneous water heater?
A. power selector pressure switch C. pressure relief valve
B. power adjusting knob D. safety thermostat

67. Figure BO 05.99-03 shows the basic component parts of a solar water heater such as that as manufactured by
“Solahart”, Chamber 11 is the storage of hot water. Chamber 3 is the entry of heated water from the solar panels 9 and 10.
What is part no. 4, which is a vital part of a solar water heater to keep the heat in and keep the cold out?
A. polyurethane foam insulation C. thick ceramic glass outsulation
B. thick aluminum insulation D. expanded polythelyne foam insulation

68. The packaging and assembly of an elevator as it arrives on site is:

A. Fully knockdown and assembled
B. Arrives as a complete package unit and installed as a complete unit
C. Knockdown by major component part and assembled by component
D. Labor intensive assembly and installation

69. International Standard ISO 4190.1 categorizes elevators use into 5 categories. Category III elevator is exclusively for:
A. goods accompanied by persons C. passengers only
B. service lifts for goods only D. transport of beds

70. Figure BO 05.01 shows a typical refrigeration cooling cycle. Identify which among the tubing contains warm
refrigerant liquid?
A. No. 8 C. No. 5
B. No. 6 D. No. 7

71. What major component part functions to cool the condenser unit in a central airconditioning system?
A. Chiller C. Fan and motor
B. Air handling unit D. Cooling tower

72. Figure BO 07.99-09 shows a floor duct tubing and fitting method of raceway installation. This method is best applied
in large construction where coordination of different trades is extremely impossible allowing electrical installation to
proceed on its own timetable. From the figure, what is part no. 10, which is used to connect a rigid conduit to the ducts?
A. Adapter C. Low tension outlet stand
B. Insert Stud D. Duct coupling

73. Two lights in a long hallway connected in parallel are to be controlled simultaneously at three points. Which switch
combination is to be used?
A. Single pole switch at start, 3-way switch at midpoint and single pole switch at end
B. Double pole switch at start, 3-way switch at midpoint and 3-way switch at end
C. 3-way switch at start, 2-way switch at midpoint and double pole at end
D. 3-way switch at start, 4-way switch at midpoint and 3-way switch at end

74. A type of cable which is a factory assembled of two or more insulated conductors, with or without associated bare or
covered grounding conductor under a non-metallic sheath; approved for installation in cable trays, in raceways, or where
supported by a messenger wire. This cable is highly recommended for use in industrial establishments where the
conditions of ready access for maintenance and supervision is a requirement and facilitates qualified persons to service
the installation.
A. Shielded nonmetallic-sheathed cable type SNM
B. Non-metallic sheathed cable type NM
C. Power and control tray cable type TC
D. Flat cable assemblies type FC

75. What type of wire and cables with a trade name as Heat Resistant Rubber with maximum operating temperature of 75
JANUARY 1999 BOARD EXAMINATION 10
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
degrees centigrade used for dry location?
A. RH C. RHH
B. RUH D. RHW

76. Which light source used in lighting fixtures best specified in areas such as those requiring high illumination levels for
detailed work such as needle work?
A. Fluorescent lamp C. Metal halide
B. High pressure sodium D. Low pressure sodium

77. A transformer connection required in some localities where a three-phase power is required from a two-phase system.
In this case, the special taps must be provided on the secondary side.
A. Scott connection – Two phase to three phase C. Y-Y for lighting and power
B. Special connection – Two phase to three phase D. Scott connection – Three phase to two phase

78. Given Figure BO 07.166. The figure shows the common switch wiring devices. Below each individual figure shows
the switching diagram identifying its switch type, which maybe a single pole, double pole, 2-way, 4-way, etc. Identify
which is a 4-way non-appellation switch?
A. 11 C. 3
B. 10 D. 5

79. What type of building wire has a trade name as Moisture Resistant Thermoplastic with a maximum operating
temperature of 60 degrees centigrade and applied for dry and wet location?
A. THW C. THWN
B. TW D. THHN

80. What is the allowable ampacity of an insulated copper conductor, based on an ambient temperature of 30 degrees
centigrade, with a 2.0 sq. mm. in cross-sectional area in size, but no more than three conductors in a raceways type TW?
A. 20 amperes C. 10 amperes
B. 30 amperes D. 15 amperes

81. Given Figure BO 07.166. The Figure shows the common switch wiring devices. Below each individual figure shows
the switch diagram identifying its switch type, which maybe a single pole, double pole, 3-way, 4-way, etc. Identify which
is a low switch with a Lead Emitting Diode?
A. 8 C. 6
B. 7 D. 12

82. What is the maximum horizontal range between two ore more air terminals for lightning arrest for effective disaster
prevention in buildings?
A. 7500 mm to 9000 mm C. 10000 mm to 12000 mm
B. 5000 mm to 6000 mm D. 6000 mm to 7600 mm

83. What type of building wire has a trade name as Heat Resistant Thermoplastic with a maximum operating temperature
of 90 degrees centigrade and best suited for dry locations?
A. THW C. THWN
B. TW D. THHN

84. Given Figure BO 07.99-03. Figure shows floor receptacle for different purposes. Which is a Duplex floor receptacle
outlet for telephone?
A. 5 C. 10
B. 1 D. 6

85. An outline as shown in Figure BO 07.99-02 shows wiring diagrams of a panel board. If the main power supply and
wiring system is a 110/220 volt line, which wiring diagram resembles that of the panel board?
A. 2 C. 4
B. 3 D. 1

86. Given Figure BO 07.146. The figure shows the second floor lighting layout of a residence. The legend shows the
JANUARY 1999 BOARD EXAMINATION 11
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
diagonal slash lines representing the number of wires inside the conduit to complete the circuit. The notes stipulate the
switch circuitry. If the lighting power source is 220 volts, in which location of circuit no. 4 represents a wrong number of
wires inside the conduit? The encircled number represents the location.
A. 11 C. 14
B. 13 D. 10

87. A situation where a pilot light inside a switch is lit to guide a person in the dark. The small pilot light inside the switch
turns off when switching the lighting fixture. What type of switch is best recommended for this purpose?
A. Dimmer switch C. Glow switch
B. Appellation switch D. Illuminated switch

88. Which of the following statements is best suited for a Rigid Nonmetallic Conduit like PVC for underground
installation in buildings?
A. PVC is allowed for underground use provided that it is encased in no less than 75 mm of concrete.
B. PVC is allowed for as long as both burial depth of no less than 460 mm and concrete encasement is provided.
C. PVC is not allowed for underground use despite concrete encasement.
D. PVC is allowed for underground use under building slab provided that it is of a burial depth of no less than 460 mm.

89. Given Figure BO 07.20, identify the transformer connection.

A. Open Y-delta C. Y-delta for power
B. Delta-Y for lighting and power D. Y-delta for lighting and power

90. Which is the allowable ampacity of an insulated copper conductor, based on an ambient temperature of 30 degrees
centigrade, with a 22 sq. mm. cross sectional area in size, and not more than three conductors in a raceway type USE?
A. 65 amperes C. 45 amperes
B. 85 amperes D. 110 amperes

91. Given Figure BO 07.146. The Figure shows the second floor lighting layout of a residence. The legend shows the
diagonal slash lines representing the number of wires inside the conduit to complete the circuit. The notes stipulate the
switch circuitry. If the lighting power source is 110 volts, in which location of circuit no. 3 represents a WRONG number
of wires inside the conduit? The encircled number represents the location.
A. 2 C. 1
B. 8 D. 3

92. An air terminal for lightning arrest is distanced at 7600 mm. What must be the least height of the air terminal above
the building part being protected for disaster prevention?
A. 550 mm C. 600 mm
B. 700 mm D. 850 mm

93. What is the standard color-coding for grounding conductor?

A. yellow C. black
B. white D. red

94. What is the term applied to sound should the frequency be higher than 20,000 hertz?
A. radio waves C. ultrahertz
B. gamma waves D. ultrasound

95. What effective method can be employed to reduce direct noise, which is transmitted airborn, for noise reduction
within a space?
A. Install absorbent materials within the wall of the enclosure
B. Placement of a functional screen between the source and the listener
C. Use of flexible mountings and connections between equipment and its foundation
D. Isolate the base foundation of the equipment

96. A unit of acoustic absorption equivalent to the absorption by one square root of a perfect absorber.
A. hertz C. sabin
B. decibel D. sound absorption coef
JANUARY 1999 BOARD EXAMINATION 12
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
97. What method is the first defense from external noise by site selection and site planning for a quiet internal acoustic
environment?
A. Using non-sensitive parts of the building as barriers
B. Positioning of openings away from the noise source
C. Use of noise insulating building envelope
D. Avoiding zones of directional sound

98. Compute for the velocity of sound if its wavelength is 1.50 m at a frequency of 1,500 Hz.
A. 0.00328 fps C. 7,380 fps
B. 3048.7 fps D. 304.87 fps

99. Which of the following statements does NOT describe velocity of sound correctly?
A. If the temperature in a room increases, the speed of sound also increases.
B. Changes in pressure at controlled density have virtually no effect on the speed of sound.
C. Sound travels slightly slower in moist air than in dry air because moist air contains a greater number of lighter
molecules.
D. The product of the wavelength and frequency is equal to the speed of propagation of the sound wave.

100. A perceptual characteristic of sound which is the average rate of flow of energy per unit area perpendicular to the
direction of propagation.
A. intensity C. harmonic constitution
B. pitch D. loudness

*** END ***

SUBMIT THIS TEST QUESTION SET TOGETHER WITH THE ANSWER SHEET TO YOUR WATCHERS. BRINGING
THE TEST QUESTION SET OUT OF THE ROOM WILL BE A GROUND FOR DISCIPLINARY ACTION.
JANUARY 1999 BOARD EXAMINATION 13
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
ANSWERS:
Disclaimer: Most of the answers here have already been exhaustively researched and/or asked to authorities. Nevertheless,
there is also room for errors, as answers to board exams are very unpredictable (depending on the references used by the
board examiners). As such, it is advisable that you double-check them. Those answers that have a question mark after it,
means that this is just a guess, as the reference for this have not yet been found.

1. A trying to fool you.

2. A 32. A
3. A 33. C
4. C 34. A
5. A 35. D: (polyethylene pipes and fittings—choice B—is
6. B colored white)
7. A: Fajardo plumbing book (memorize the whole chart of 36. D: The initials DWV means drain, waste, vent, and
this) drain, waste, vent pipes are colored orange brown.
8. A: Fajardo plumbing book (memorize the whole chart of Neltex is an example of this)
this) 37. B
9. D: (Plumbing code) 38. A
WET STAND DRY STAND 39. B
PIPE PIPE 40. D
Outlet 1 1/2” 2 1/2” 41. B: (plumbing code) See chart on no.9
diamete 42. A
r 43. A: (see chart on no. 41)
Pipe 2 1/2” (>15m 6” (>23 m bldg. 44. A
diamete bldg. ht) ht) 45. B
r 2” (< 15m bldg. 6” (<23 m bldg. 46. A: See American Graphic Standards
ht) ht) 47. B: See American Graphic Standards
Height 91-182 cm 46-122 cm 48. B
10. A 49. B
11. A 50. A
12. C 51. B
13. A: Fire code (p.191) 52. C
14. A 53. D
15. C 54. D
16. A: A sanitary tee is always the one accepting 55. B: Japanese brand is Mitsubishi. See Mitsubishi
“things” from the P-trap of a lavatory. brochures.
17. B: Key words for a yoke vent: multi-branch, vertical 56. A
vent… connects to main vent stack. 57. A: Standard speeds are 45m/min, 60m/min, 90m/min
18. D and 105m/min.
19. D: Actually, even without the table, it is usually 4 58. A
inches for this type of buildings. (see no. 21) 59. D: See American Graphic Standards
20. C 60. C: This is for normal room condition. But it would
21. D vary for other conditions, like those of restaurants (15 sq.
22. A: If it is not exceeding 3 inches, it is always a m. per TR).
nipple. 61. D: Japanese brand is Mitsubishi. See Mitsubishi
23. C brochures.
24. C 62. A
25. B 63. B
26. D? 64. B
27. D: National Plumbing Code Handbook (by 65. D
Woodson) or Audel’s Plumbing series 66. ?
28. B 67. A
29. A? 68. A
30. D: A full open valve is also a gate valve, and an 69. D
angle valve is a gate valve. Category 1: persons only; Category 2: persons with
31. C: Sources say that the hot water demand is 10 liters goods; Category 3: hospital beds;
per head, so 12 heads x 10 = 120 liters. The 3.6 cubic Category 4: goods with people; Category 5: goods
meter has nothing to do with the computation and is just only
JANUARY 1999 BOARD EXAMINATION 14
Part 1: Utilities Jan. 23, 1999 (08:00 am -– 12 noon)
70. ? See American Graphic Standards
71. D: See American Graphic Standards
72. A
73. D: See Fajardo electrical book
74. D
75. A: See Fajardo electrical book
76. A
77. A
78. D
79. B
80. D: See Fajardo electrical book
81. C: The diagram has the initials LED. LED is Lead
Emitting Diode.
82. A: Elctrical Code
83. D: See Fajardo eletrical book
84. C
85. ?
86. A
87. D
88. ?
89. ?
90. B: See Fajardo electrical book
91. C
92. ?
93. B: Building Code
94. D
95. A?
96. C
97. D
98. C
The formula for use here: V=λf, where V=speed of
sound; λ=the wavelength; f=frequency.
In using this formula, see to it that the units are the
same. For this problem, notice that the wavelength is
in meters, while velocity is in feet. Convert first,
before solving.
99. C
100. A