Question Bank 13 Flashcards
(100 cards)
1
Q
An operation in which the motor runs when the push button is pressed and will stop when the push button is released. A. Clipping B. Jogging C. Plugging D. Commissioning
A
B. Jogging
2
Q
It is not advisable to leave a lead acid storage battery in a discharged state for a long time mainly because A. the plates will become sulphated B. electrolyte will attack the condenser C. electrolyte will become weak D. acid will evaporate
A
A. the plates will become sulphated
3
Q
An instrument used to measure temperature. A. Thermometer B. Tachometer C. Synchroscope D. Thermocouple
A
A. Thermometer
4
Q
What is the angular velocity for a 25-cycle circuit? A. 3.1416 radians per second B. 157 radians per second C. 377 radians per second D. 314 radians per second
A
B. 157 radians per second
5
Q
A term universally employed to measure wire diameters. A. Millimeter B. Circular mil C. Meter D. Mil
A
D. Mil
6
Q
In a radio, gang condenser is a type of A. electrolytic capacitor B. paper capacitor C. ceramic capacitor D. air capacitor
A
D. air capacitor
7
Q
To keep the terminals of a lead-acid storage battery free from corrosion, it is advisable to
A. keep electrolyte level low
B. apply petroleum jelly
C. charge the battery at frequent intervals
D. clean the terminals frequently
A
B. apply petroleum jelly
8
Q
A \_\_\_\_\_ is a device with functions that is similar to a rectifier. A. transformer B. contactor C. inverter D. commutator
A
D. commutator
9
Q
Which of the following is a typical usage of an autotransformer? A. Motor control transformer B. Grounding transformer C. Distribution transformer D. Multi-voltage transformer
A
D. Multi-voltage transformer
10
Q
The electrolyte used in carbon-zinc dry cell is a combination of \_\_\_\_\_ dissolved in water. A. sulphuric acid and manganese dioxide B. powdered carbon and zinc chloride C. ammonium chloride and zinc chloride D. none of these
A
C. ammonium chloride and zinc chloride
11
Q
Which of the following statements is NOT true regarding a cell?
A. The plates must be immersed in some electrolyte solution such as an acid, an alkali or a salt
B. Decreasing the distance between plates, decreases the internal resistance of the cell
C. The plates must be of different metals
D. Increasing the size of the electrodes, increases the emf of the cell
A
D. Increasing the size of the electrodes, increases the emf of the cell
12
Q
The \_\_\_\_\_ rating of a circuit breaker is the maximum short circuit current which the breaker will interrupt safely. A. instantaneous B. interrupting capacity C. optimum current D. optimum voltage
A
B. interrupting capacity
13
Q
A 2-pole ac generator is running at 1,500 rpm. What is the frequency? A. 25 Hz B. 50 Hz C. 60 Hz D. 45 Hz
A
A. 25 Hz
14
Q
An ohmmeter measures A. very high power B. resistance C. insulation resistance D. temperature
A
B. resistance
15
Q
If a transformer bank is using an open delta connection, how many single-phase transformers are interconnected? A. Only one B. Two C. Three D. More than three
A
B. Two
16
Q
What is the advantage of star connection over mesh connection for the same phase voltage? A. It has a higher line voltage B. It has a higher line current C. It gives a higher apparent power D. All of these
A
A. It has a higher line voltage
17
Q
A cell with an emf of 1.45 V is connected to an external resistance of 2 ohms. If the current drawn by the external resistance is 0.5 A, what is the internal resistance of the cell? A. 0.80 ohm B. 0.90 ohm C. 0.10 ohm D. 0.25 ohm
A
B. 0.90 ohm
18
Q
Which of the following metals has the highest melting point? A. copper B. gold C. solver D. tungsten
A
B. gold
19
Q
In an open delta connected system,
A. phase voltage is greater than line voltage
B. phase voltage is lesser than line voltage
C. phase voltage is equal to line voltage
D. phase voltage is zero
A
C. phase voltage is equal to line voltage
20
Q
Electrical symbol represented by a broken line. A. Open wiring B. Circuit homerun C. Underground wiring D. Emergency wiring
A
A. Open wiring
21
Q
Which of the following defines an insulator?
A. A substance that offers a low resistance to current flow
B. A substance that offers a high resistance to current flow
C. A form of a condenser
D. A substance that absorbs electricity
A
B. A substance that offers a high resistance to current flow
22
Q
Among the multimeters, the \_\_\_\_\_ features compactness, simplicity and portability. A. VOM B. VOTM C. VTVM D. all of these
A
A. VOM
23
Q
A squirrel cage induction motor has a \_\_\_\_\_ starting torque. A. very low B. zero C. very high D. moderate
A
A. very low
24
Q
How many wattmeters are needed to measure unbalanced three-phase loads whose phase impedances cannot be opened? A. One B. Two C. Three D. Four
A
B. Two
25
The inert gas present in an incandescent bulb is primarily intended to
A. increase lumen output
B. activate the surface of the filament
C. decrease filament evaporation
D. reduce the hazards when the glass bulb is shattered
A. Increase lumen output
26
```
When a lead acid battery is in a nearly discharge condition, the electrolyte is in its _____ state.
A. stable
B. strongest
C. weakest
D. normal
```
C. weakest
27
```
A device used to measure the mechanical output of a motor or a generator is called
A. watt-hour meter
B. sphygmomanometer
C. engine indicator
D. dynamometer
```
D. dynamometer
28
```
Minimum oil circuit breakers are used for HV system. The oil is used to
A. ensure effective operation
B. prevent grounds
C. cool the breaker
D. quench the arc and as an insulator
```
D. quench the arc and as an insulator
29
```
Which of the following metals has the highest electrical and thermal conductivity?
A. Gold
B. Platinum
C. Palladium
D. Silver
```
D. Silver
30
```
When the speed of the alternator increases, the frequency
A. varies exponentially
B. remains the same
C. increases
D. decreases
```
C. increases
31
```
Which of the following is NOT a cause for a generator to vibrate?
A. Misalignment
B. Loose pigtails
C. Loose bolts
D. Faulty speed governor
```
B. Loose pigtails
32
```
An arc lamp takes 10 A at 50 V. Find the value of the resistance to be placed in series so that the lamps may burn correctly from 110-V supply.
A. 5 ohms
B. 11 ohms
C. 6 ohms
D. 10 ohms
```
C. 6 ohms
33
```
A 15-hp, 220 V shunt motor has an efficiency of 87% at full load. The resistance of the field is 440 ohms. What is the full load armature current?
A. 67.59 A
B. 57.96 A
C. 75.69 A
D. 49.58 A
```
B. 57.96 A
34
```
If a three-phase load is unbalanced, the most suitable system connection is a
A. 3-wire star connection
B. 3-wire closed delta connection
C. 3-wire open delta connection
D. 4-wire star connection
```
D. 4-wire star connection
35
```
The transformer oil used in a transformer provides
A. insulation and cooling
B. insulation, cooling and lubrication
C. insulation and lubrication
D. cooling and lubrication
```
A. insulation and cooling
36
```
An RME whose certificate of registration has been revoked may, after the lapse of _____ year(s) from the surrender thereof, be reissued with issued with such certificate upon approval by the Commission after he has established to the Board that he is still fit to continue practicing his profession.
A. 3
B. 1
C. 2
D. 5
```
B. 1
37
```
What is the rated primary current of a 250 kVA, 480/230 - volt 3-phase transformer?
A. 521 A
B. 628 A
C. 301 A
D. 1086 A
```
C. 301 A
38
```
Mica is commonly used for _____.
A. panelboards
B. pole insulators
C. appliance insulation
D. commutator bar segments
```
D. commutator bar segments
39
```
Coulomb is to charge as a joule is to _____.
A. heat
B. emf
C. energy
D. power
```
C. energy
40
```
Which of the following instruments can be used to measure wire diameters?
A. wire gauge
B. Micrometer
C. Megger
D. Multitester
```
B. Micrometer
41
```
An over-excited synchronous motor operates at _____ power factor.
A. leading
B. lagging
C. unity
D. zero
```
A. leading
42
```
Lap windings in dc generators are used for _____ applications.
A. low voltage, low current
B. low voltage, high current
C. high voltage, high current
D. high voltage, low current
```
B. low voltage, high current
43
```
What type of prime movers drives a high-speed alternator?
A. Diesel motor
B. Gas turbine
C. Steam turbine
D. Hydraulic turbine
```
C. Steam turbine
44
```
If the excitation on one alternator in parallel operation is adjusted, which of the following parameter of the alternator will change?
A. Load
B. Frequency
C. Power factor
D. All of these
```
C. Power factor
45
```
The _____ shall be the executive officer of the board (BEE)?
A. President of the Philippines
B. BEE board
C. Commissioner
D. Chairman of the board (BEE)
```
A. President of the Philippines
46
```
What is a dead board?
A. A board with no switches
B. A board which is overload
C. A board with no power
D. A board with no circuit breaker
```
C. A board with no power
47
```
A 3-phase wye connected solidly grounded alternator is under test. Between one terminal and ground, the voltmeter registers 120 V, between any two terminals, the voltmeter is expected to register _____.
A. 360 V
B. 208 V
C. 170 V
D. 240 V
```
B. 208 V
48
```
Most common semi-conductor in used today.
A. Germanium
B. Silicon
C. Arsenic
D. None of these
```
B. Silicon
49
The purpose of the ballast in a fluorescent lamp assembly is
A. to regulate the voltage across the lamp
B. to improve the overall power factor
C. to limit the current through the lamp
D. to regulate the lumens output
C. to limit the current through the lamp
50
```
Where a conduit enters a box, fitting or other enclosure, what shall be provided to protect the wire from abrasions?
A. Lock nut
B. Stud bolt
C. Fastener
D. Bushing
```
D. Bushing
51
```
In hospitals, the general lighting load required shall be _____.
A. 24 VA/m^2
B. 12 VA/m^2
C. 16 VA/m^2
D. 28 VA/m^2
```
C. 16 VA/m^2
52
```
Rod electrodes of steel or iron shall be at least _____ in diameter.
A. 10 mm
B. 12 mm
C. 14 mm
D. 16 mm
```
D. 16 mm
53
```
Bonding jumpers which connect communications cable grounding conductors and the grounding electrode of the building shall NOT be smaller than what copper size?
A. 5.5 mm^2
B. 8.0 mm^2
C. 14.0 mm^2
D. 3.5 mm^2
```
C. 14.0 mm^2
54
```
Each plate electrode shall expose NOT less than _____ of surface to exterior soil.
A. one-fifth square meter
B. one-fourth square meter
C. one-third square meter
D. one-half square meter
```
A. one-fifth square meter
55
```
Non-metallic sheathed cable shall NOT have a bending radius less than _____ times the diameter of the cable.
A. 8
B. 7
C. 5
D. 6
```
C. 5
56
```
Conductors after the final overcurrent device and before the load served.
A. Branch circuit conductors
B. Service conductors
C. Feeder conductors
D. None of these
```
A. Branch circuit conductors
57
```
Type FCC cable shall be permitted for the following applications EXCEPT one. Which one is this?
A. for branch circuits
B. for service entrance
C. in damp locations
D. in heated floors
```
B. for service entrance
58
```
In every drawing, the title block shall be a standard strip, which shall contain the name of the project, owner, title of the sheet, scale used, name and signature of the PEE. How wide is this strip?
A. 35 mm
B. 30 mm
C. 40 mm
D. 45 mm
```
C. 40 mm
59
```
Intermittent operation in which the load conditions is regularly recurrent.
A. Varying duty
B. Intermittent duty
C. Periodic duty
D. Short time duty
```
C. Periodic duty
60
```
Underground cable feeder and branch circuit cables shall be permitted for use in any of the following applications EXCEPT one. Which one is this?
A. Where embedded in poured concrete
B. For interior wiring
C. For direct burial
D. Where used in corrosive locations
```
B. For interior wiring
61
```
A factory assembly 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 or in raceways.
A. type NM
B. type FCC
C. type TC
D. type USE
```
C. type TC
62
```
The minimum size of conductors to be used for lighting purposes is
A. 1.5 mm^2
B. 1.25 mm^2
C. 1.75 mm^2
D. 2.0 mm^2
```
D. 2.0 mm^2
63
```
Conductors on poles shall have a separation of NOT less than _____ where not placed on racks or brackets.
A. 300 mm
B. 250 mm
C. 400 mm
D. 150 mm
```
A. 300 mm
64
```
Non-metallic surface extensions shall be secured in place by approved means at intervals NOT exceeding _____.
A. 100 mm
B. 500 mm
C. 300 mm
D. 200 mm
```
D. 200 mm
65
```
Any unguarded metal sheathed service cable, service conduits, metal fixtures and similar non-current carrying part, if located in urban districts and where liable to be charged to more than a certain voltage to ground shall be isolated or guarded so as not to be exposed to accidental contact by unauthorized persons. What is this voltage?
A. 1,000 V
B. 500 V
C. 150 V
D. 300 V
```
D. 300 V
66
```
Auxiliary gutters may enclose conductors or busbars but shall NOT enclose which of the following?
A. Switches
B. Overcurrent devices
C. Appliances
D. All of these
```
D. All of these
67
```
Where an intermediate metal conduit is used, there shall not be more than the equivalent of _____ quarter bends between pull point.
A. 2
B. 4
C. 3
D. 5
```
B. 4
68
```
Rigid metal conduit shall be supported at least every _____
A. 2,000 mm
B. 2,500 mm
C. 3,000 mm
D. 1,500 mm
```
C. 3,000 mm
69
```
Service entrance conductors passing over roofs shall have a clearance over the roof which they pass of
A. 1,000 mm
B. 2,000 mm
C. 1,500 mm
D. 2,500 mm
```
D. 2,500 mm
70
```
Liquidtight metal conduit smaller than _____ electrical trade size shall NOT be used.
A. 20 mm
B. 15 mm
C. 12 mm
D. 10 mm
```
B. 15 mm
71
```
Rigid metal conduits smaller than _____ electrical trade size shall NOT be used.
A. 15 mm
B. 20 mm
C. 12 mm
D. 16 mm
```
A. 15 mm
72
```
Flexible metal conduit shall be secured by an approved means at intervals NOT exceeding _____.
A. 1,200 mm
B. 1,300 mm
C. 1,500 mm
D. 1,400 mm
```
B. 1,300 mm
73
```
Which of the following premises wiring installations is NOT covered in the scope of the Philippine Electrical Code?
A. Parking lots
B. Dockyards
C. Quarries and mines
D. Motor vehicles
```
D. Motor vehicles
74
```
An auxiliary conductor used in connection with remote measuring devices or for operating apparatus at a distant point.
A. Tie wire
B. Jumper wire
C. Pilot wire
D. Dummy wire
```
C. Pilot wire
75
```
A unit or assembly of units or sections and associated fittings, forming a rigid structural system used to support cables.
A. Cable tray
B. Cable bus
C. Wire way
D. Busway
```
A. Cable tray
76
```
The conductors including splices and taps shall NOT fill the wireway to more than _____ percent of its area at that point.
A. 65
B. 70
C. 75
D. 80
```
C. 75
77
```
Overcurrent in transformers affect all of the following EXCEPT
A. breather effectiveness
B. mechanical stresses
C. life insulation
D. rise in temperature
```
A. breather effectiveness
78
```
The rating the branch circuit using flat cable assemblies shall NOT exceed _____.
A. 40 A
B. 30 A
C. 20 A
D. 15 A
```
B. 30 A
79
```
One or more non-metallic surface extensions shall be permitted to be run in any direction from an existing outlet, but NOT on the floor or within _____ from the floor
A. 50 mm
B. 100 mm
C. 75 mm
D. 25 mm
```
A. 50 mm
80
```
Service drop conductors passing over residential property and driveways and those commercial areas not subject to truck traffic shall have a vertical clearance of
A. 4,600 mm
B. 5,500 mm
C. 3,700 mm
D. 4,800 mm
```
A. 4,600 mm
81
```
The equipment bonding jumper shall be permitted to be installed inside or outside of a raceway or enclosures where installed on the outside, the length of the equipment bonding jumper shall NOT exceed _____.
A. 2,000 mm
B. 1,500 mm
C. 1,800 mm
D. 1,200 mm
```
C. 1,800 mm
82
```
An electrician should consider all electrical equipment live unless he definitely knows what they are not. The main reason of this practice is to avoid
A. personal injury
B. energizing the wrong circuit
C. de-energizing the wrong circuit
D. unnecessary work
```
A. personal injury
83
```
Electrical floor assemblies shall NOT be installed _____.
A. where subject to corroded vapors
B. outdoors
C. in wet or damp locations
D. all of these
```
D. all of these
84
```
In cases where there are energized parts normally exposed on the front of switchboards or motor control centers, the working space in front shall NOT be less than _____.
A. 1,000 mm
B. 1,500 mm
C. 2,000 mm
D. 1,800 mm
```
A. 1,000 mm
85
```
The rating of the branch circuit serving a continuous load shall NOT exceed _____ percent of the continuous load.
A. 100
B. 130
C. 125
D. 115
```
C. 125
86
```
Cabinet and cutout boxes shall have an air space at least _____between the base of the device and the wall of any metal cabinet or cutout box in which the device is mounted.
A. 1.5 mm
B. 1.8 mm
C. 2.0 mm
D. 2.4 mm
```
C. 2.0 mm
87
```
Service conductors in cable shall NOT be smaller than ____.
A. 5.5 mm^2
B. 8.0 mm^2
C. 3.5 mm^2
D. 14.0 mm^2
```
A. 5.5 mm^2
88
```
At least how many receptacle outlet(s) shall be installed in the bathroom?
A. One
B. Two
C. Three
D. None of these
```
A. One
89
```
What is the maximum allowable voltage drop from the distribution panel to the farthest load?
A. 10 %
B. 5 %
C. 3 %
D. 2 %
```
B. 5%
90
```
Conductors in concealed knob and tube wiring shall maintain a clearance of NOT less than _____ between the conductor and the surface over which it passes.
A. 30 mm
B. 25 mm
C. 28 mm
D. 26 mm
```
D. 26 mm
91
The use of rigid metal conduits shall be permitted under all atmospheric conditions subject to the following conditions EXCEPT one. Which one is this?
A. Aluminum fittings and enclosures shall be permitted to be used with rigid steel conduits.
B. Ferrous metal conduits shall be permitted to be installed in concrete
C. Conduits shall be permitted to be used in sand fill which is subject to permanent moisture
D. Where the ferrous raceways are protected solely by enamel, the use is permitted only indoors
C. Conduits shall be permitted to be used in sand fill which is subject to permanent moisture
92
```
An exposed wiring method using cleats, knobs, tubes and flexible tubing for the protection and support of single insulated conductor run in or on building and not concealed by the building structure.
A. Open wiring on insulators
B. Concealed knob and tube wiring
C. Armored cable wiring
D. Metal clad cable wiring
```
A. Open wiring on insulators
93
```
The radius of the inner edge of any bend for type MI cables shall NOT be less than _____ times the diameter of the cable.
A. 5
B. 6
C. 7
D. 8
```
A. 5
94
```
General purpose and appliance branch circuits using type FCC cable shall have ratings NOT exceeding _____.
A. 20 A
B. 15 A
C. 30 A
D. 40 A
```
A. 20 A
95
```
Communication conductors shall NOT be attached to a cross arm below electric light and power conductors under Art 10.1, 3.1 (a) (2).
A. No one cares
B. True
C. False
D. Allowed with approval from unitlity
```
D. True
96
```
Interlocked type armored cable or corrugated sheath cables hall have a bending radius of NOT less than _____ times the external diameter of the metallic sheath.
A. 7
B. 10
C. 12
D. 5
```
A. 7
97
Type AC cable shall be permitted in one of the following. Which one is it?
A. for branch circuits
B. for feeders
C. in cable trays where identified for such usage
D. all of the these
D. all of these
98
```
In banks and office buildings, a unit load of _____ VA per square meters shall be included for the general purpose receptacle outlets when the actual number of outlets is unknown.
A. 6
B. 8
C. 10
D. 12
```
B. 8
99
```
Where receptacles are connected to a 30-A branch circuit, the maximum allowable cord and plug connected load shall not be more than
A. 30 A
B. 24 A
C. 16 A
D. 20 A
```
B. 24 A
100
```
For a series RC circuit, the circuit power factor is _____.
A. lagging
B. leading
C. in-phase
D. zero
```
B. leading
