philippine electrical code 3 | Exams Electrical Engineering

1. Fixed wiring methods shall be as provided for the following except for.

a. audio signal processing

b. amplification

c. reproduction equipment

d. canopy lighting system

2. According to the code, only such electric wiring, raceways, and cables used directly in

connection with the elevator or dumbwaiter, including wiring for signals, for communication

with the car, for lighting, heating, air conditioning, and ventilating the elevator car, for fire

detecting systems, for pit sump pumps, and for heating, lighting, and ventilating the hoistway,

shall be permitted inside the following location except for

a. Hoistway

b. Plenum

c. machine rooms and machinery spaces

d. control rooms and control spaces

3. Communication, radio, and television coaxial cables shall be permitted at a height of not less

than ______ above swimming and wading pools, diving structures, and observation stands,

towers, or platforms.

a. 8.0 m b. 3.0 m c. 1.0 m d. 0.5 m

4. A raceway marked ______ is suitable for use in ducts

a. plenum b. plemun c. plema d. Plumen

5. Circuits used only for the operation of fire alarm, other protective signaling systems, or the

supply to fire pump equipment _________to be connected on the supply side of the service

overcurrent device where separately provided with overcurrent protection

a. shall be permitted b. shall not be permitted

c. not stated in the code d. not required by the Code

6. According to the table of operating voltage in the code. The minimum conductor size for

copper conductor for 2000 v is

a. 8.0 sq mm b. 2.0 sq mm c. 3.5 sq mm d. 5.5 sq mm

7. According to the table of operating voltage in the code. The minimum conductor size for

copper conductor for 8000 v is

a. 8.0 sq mm b. 2.0 sq mm c. 3.5 sq mm d. 5.5 sq mm

8. According to the table of operating voltage in the code. The minimum conductor size for

copper conductor for 15,000 v using AWG system is.

a. 2 b. 12 c. 1 d. 0

9. Determine the minimum-size service conductors to supply a 100 A lighting and appliance

load plus three squirrel-cage induction motors rated 460 volts, 3 phase, 40°C, full-voltage

starting one 100-hp rated at 124 A at full load and two 25-hp motors rated at 34 A at full load

on a 480-volt, 3-phase system.

a. 223 A b. 155 A c. 323 A d. 292 A

10. Determine the maximum rating of the service overcurrent protective device that will supply a

100 A lighting and appliance load plus three squirrel-cage induction motors rated 460 volts, 3

phase, 40°C, full-voltage starting one 100-hp rated at 124 A at full load and two 25-hp motors

rated at 34 A at full load on a 480-volt, 3-phase system.

a. 453 A b. 518 A c. 523 A d. 392 A

Partial preview of the text

Download philippine electrical code 3 and more Exams Electrical Engineering in PDF only on Docsity!

Fixed wiring methods shall be as provided for the following except for. a. audio signal processing b. amplification c. reproduction equipment d. canopy lighting system
According to the code, only such electric wiring, raceways, and cables used directly in connection with the elevator or dumbwaiter, including wiring for signals, for communication with the car, for lighting, heating, air conditioning, and ventilating the elevator car, for fire detecting systems, for pit sump pumps, and for heating, lighting, and ventilating the hoistway, shall be permitted inside the following location except for a. Hoistway b. Plenum c. machine rooms and machinery spaces d. control rooms and control spaces
Communication, radio, and television coaxial cables shall be permitted at a height of not less than ______ above swimming and wading pools, diving structures, and observation stands, towers, or platforms. a. 8.0 m b. 3.0 m c. 1.0 m d. 0.5 m
A raceway marked ______ is suitable for use in ducts a. plenum b. plemun c. plema d. Plumen
Circuits used only for the operation of fire alarm, other protective signaling systems, or the supply to fire pump equipment _________to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection a. shall be permitted b. shall not be permitted c. not stated in the code d. not required by the Code
According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 2000 v is a. 8.0 sq mm b. 2.0 sq mm c. 3.5 sq mm d. 5.5 sq mm
According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 8000 v is a. 8.0 sq mm b. 2.0 sq mm c. 3.5 sq mm d. 5.5 sq mm
According to the table of operating voltage in the code. The minimum conductor size for copper conductor for 15,000 v using AWG system is. a. 2 b. 12 c. 1 d. 0
Determine the minimum-size service conductors to supply a 100 A lighting and appliance load plus three squirrel-cage induction motors rated 460 volts, 3 phase, 40°C, full-voltage starting one 100-hp rated at 124 A at full load and two 25-hp motors rated at 34 A at full load on a 480-volt, 3-phase system. a. 223 A b. 155 A c. 323 A d. 292 A
Determine the maximum rating of the service overcurrent protective device that will supply a 100 A lighting and appliance load plus three squirrel-cage induction motors rated 460 volts, 3 phase, 40°C, full-voltage starting one 100-hp rated at 124 A at full load and two 25-hp motors rated at 34 A at full load on a 480-volt, 3-phase system. a. 453 A b. 518 A c. 523 A d. 392 A

The following are the standard ampere ratings for fuses and inverse time circuit breakers except for. a. 125 b. 150 c. 175 d. 95 A
The inverse time factor of a DC motor is a.250 % b. 175 % c. 150 % d. 140 %
The rating of an inverse time circuit breaker shall be permitted to be increased but shall in no case exceed _____percent for full-load currents of 100 amperes or less or ____ percent for full-load currents greater than 100 amperes. a. 400, 300 b. 250, 175 c. 300, 400 d. 175, 250
Either a circuit breaker with inverse time characteristics or a dual-element (time-delay) fuse may serve as the following except for. a. overload protection b. as the branch-circuit short-circuit c. series fault protection d. ground-fault protection.
Where the service drop is secured to the mast, a guy wire may be installed to support the mast and provide adequate mechanical strength to support the service drop_________ are not permitted to be attached to the service mast. a. Communications conductors b. cable TV c. telephone service d. all of the above
Actual voltage is likely to be many times the 10,000 volts calculated, because extremely low (below normal) values were assumed for both resistance to ground and current. Most insulation systems, however, are not designed to withstand even 10,000 volts. Even if the insulation system does withstand a 10,000-volt surge, it is likely to be damaged and breakdown of the insulation system will result in sparking. The same situation would exist if the current surge were on the CATV cable or on a telephone line. The only difference would be the voltage involved, which would depend on the individual resistance to ground of the grounding electrodes. What will be the solution for this problem? a. bond the two grounding electrode systems together b. create a phantom circuit c. there will be no solution, the problem is embedded in the system d. install additional line trap
The code ______the use of a raceway as a means of support for nonelectric equipment, such as suspended ceilings, water pipes, nonelectric signs, and the like, which could cause a mechanical failure of the raceway. a. allows b. prohibits c. does not mentioned d. does not detail
Optical fiber cables and conductors for operating devices, operation and motion control, power, signaling, fire alarm, lighting, heating, and air-conditioning circuits of 600 volts or less shall be permitted to be run in the same traveling cable or raceway system if all conductors are insulated for the maximum voltage applied to any conductor within the cables or raceway system and if all live parts of the equipment are insulated from ground for this maximum voltage. Such a traveling cable or raceway shall also be permitted to include shielded conductors and/or one or more coaxial cables, if such conductors are insulated for the

b. service head c. service mast d. service point

For a 3-phase, 4-wire delta system with the center of one leg grounded, there are two voltages to ground. For example, on a 240-volt system, two legs would each have 120 volts to ground and the third, or “high” leg, would have ______ volts to ground. a. 120 b. 240 c. 208 d. 360
According to the code, which of the following is incorrect? a. where an ungrounded system is utilized, the voltage to ground is the greatest voltage between the given conductor and any other conductor of the circuit b. The voltage to ground for a 480-volt ungrounded delta system is 480 volts. c. In corner-grounded delta systems, the grounded conductor is the neutral conductor. d. Continuous white or gray coloring is used to identify the grounded conductor
Where one system uses white for the grounded conductor, the second system must a. Use a different color or marking such as gray or white with a stripe. b. Use the same color c. Use an identifying mark d. Use other types of conductor
In practice, to compensate for voltage drops in a long circuit. a. larger conductors with a higher ampacity are commonly used b. the conductors are rerouted in such a way as to decrease the length of the conductor c. Use aluminum conductor d. Use metallic conduit
Which of the following load that can be connected to 20 A Branch Circuit. a. Four loads, consisting of 4A continuous duty b. 18 A non continuous load and 2 A load non continuous load c. 16 A continuous load and 4 A load non continuous load d. One 20 A continuous load
An applied voltage of 10 percent below rating can result in a decrease of fluorescent light output by. a. 10 % b. 20% c. 15% d. 5%
With an applied voltage of 10 percent below rating, the running current would increase _____percent, and the operating temperature would increase by _____percent. At the same time, torque would be reduced by _____percent. a. 11, 12, 19 b. 10,11, 12 c. 19, 12, 11 d. 10,10,
A 3-phase, 4-wire (208Y/120-volt, 480Y/277-volt) system is often used to supply both lighting and motor loads, if the maximum possible unbalanced load is 500 amperes, the neutral would have to be large enough to carry a. 350 A b. 500 A c. 410 A d. 700 A
In a Three phase four wire system, compose of lighting and motor load, demand factor of 70 percent is permitted for that portion of the neutral load in excess of _____ amperes. a. 100 b. 200 c. 300 d. 400
What is the total loading of a double duplex receptacle? a. 180 b. 4 x 90 c. 360 d. 2 x 180

Determine the feeder capacity needed for a 120/240-volt fastened-in-place appliance load in a dwelling unit for the following: Appliance Rating Load Water heater 4000 W, 240 V 4000 VA Kitchen disposal 1/2 hp, 120 V 1176 VA Dishwasher 1200 W, 120 V 1200 VA Furnace motor 1/4 hp, 120 V 696 VA Attic fan 1/4 hp, 120 V 696 VA Water pump 1/2 hp, 240 V 1176 VA a. 8944 VA b. 6708 VA c. 10789 VA d. 4000 VA
Which of the following statement is incorrect? a. It is impractical or impossible to install one service for an industrial plant with sufficient capacity for any and all future loads. b. It is impractical to run extremely long feeders. c. The expansion of buildings, shopping centers, and industrial plants often necessitates the addition of one or more services. d. It is impractical to use high voltage
Three 3-phase circuits in the same raceway, protected by overcurrent devices rated 30, 60, and 100 amperes, what shall be the size of equipment grounding conductor. a. 30 A b. 60 A c. 100 A d. 190 A
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called. a. encased b. hidden c. accessible d. enclosed
Determine the minimum standard size overcurrent protective device for a feeder circuit with the following characteristics: 3-phase, 4-wire feeder (full-size neutral) 125-ampere noncontinuous load 200-ampere continuous load 75°C overcurrent device terminal rating Type THWN insulated conductors Four current-carrying conductors in a raceway A major portion of the load is nonlinear a. 375 A b. 400 A c. 350 A d.425 A
Conductors on poles shall have a separation of not less than ________ where not placed on racks or brackets. a. 300 mm b. 500 mm c. 1000 mm d. 150 mm
Conductors supported on poles shall provide a horizontal climbing space not less than the following: I. Power conductors below communications conductors — 750 mm II. Power conductors alone or above communications conductors: 300 volts or less — 600 mm III. Power conductors alone or above communications conductors: Over 300 volts — 750 mm a. I and II only b. I, II and III c. I and III only d. III only
Additional services shall be permitted for different a. Voltages, frequencies, or phases, or for different uses, such as for different rate schedules. b. Frequencies, Short Circuit MVA, Interrupting Capacity c. Types of Loading, Application d. No of Phase and duty cycle

philippine electrical code 3, Exams of Electrical Engineering

Related documents

Partial preview of the text

Download philippine electrical code 3 and more Exams Electrical Engineering in PDF only on Docsity!