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WorksheetsQB01KDJ8SJCK
Total questions: 100
Worksheet time: 1hrs 1mins
Which of the following is a unit of electrical pressure?
Watt
Ampere
Ohm
Volt
In resistance color coding, red color is assigned to what value?
3
0
2
1
What is another name for a secondary cell?
Wet Cell
Storage Cell
Dry Cell
Disposable cell
How is a voltmeter connected in a circuit?
Connect in short circuit across the load
Connect in shunt across the load
Connect in series across the load
Connect in open circuit with the load
In the American wire gauge, as the number of gauge wire increases, the wire diameter ______.
increases
decreases
does not change
does change
A generator may lose residual magnetism because of ______.
Vibration
Over-excitation
Heating
Varying Loads
A meter whose needle is initially at the center.
Dynamometer
Iron Vane Meter
Galvanometer
Voltmeter
A universal motor can be operated on which of the following supply currents?
DC Current Only
AC or DC Currents
3-phase AC current only
AC Current Only
A 6-volt lead-acid battery has an internal resistance of 0.01 ohm. How much current will flow if the battery has a short circuit?
60 A
600 A
infinity
Zero
Automatic device that operates at present values is known as ______.
Relay
Mercury Switch
Contactor
Fuse
What is another name for full voltage starting?
Reduce voltage starting
Full Load Starting
Direct on Line
Starting without a contactor
What is the resistance reading of a shorted capacitor?
High resistance
Zero resistance
Infinite resistance
10 ohm
A wire has a diameter of 0.125 inch. What is its cross sectional area in circular mils?
12500
22500
15625
10800
In metric standard, what is the unit of conductor sizes?
AWG
Circular Mils
mm^2
cm^2
Multimeters consist of a ______.
Voltmeter, current meter and ohmmeter
Voltmeter and an ammeter
Current Meter and an ohmmeter
Voltmeter and current meter
What component of an atom that doesn't have any electrical charge?
Electron
Proton
Neutron
Ion
Excitation current is used in which of the following motors?
Synchronous motors
Wound rotor motors
Induction motors
Squirrel cage motors
A simple ohmmeter consists of a meter movement in series with,
an inductor
a spring
a capacitor
a battery
What is the former name of the American Wire Gauge?
NEMA
Westinghouse
Brown and Sharpe
IEEE
What resistance must be connected across a 4-ohm resistance in order to give an equivalent resistance of 3 ohms?
10 ohms
8 ohms
12 ohms
9 ohms
When using ohms law, E divided by I would solve for _____.
Watts
Amperage
Voltage
Resistance
Modern contact surfaces are made from what alloys?
Copper
Silver
Aluminum
Manganin
On a simple ohmmeter, the zero ohm mark is _____ of the scale.
In the right
far left
none of these
far right
Two resistances of 8 and 10 ohms respectively are connected in parallel and take a total current of 9 A. What is the current flowing in the 8-ohm resistance?
5 A
4 A
6 A
3 A
How do you call a diagram showing the physical location of the components such as coils, contacts, motors and the like in their actual positions?
Ladder diagram
Schematic Diagram
Wiring diagram
Power flow diagram
An electric iron takes 3 1/2 A. If the heating element has a resistance of 40 ohms, what is its power consumption?
0.45 kW
0.49 kW
0.35 kW
0.51 kW
What is the purpose of constructing a lead acid cell into a multiple plate cell?
To increase the emf of the cell
To increase the capacity of the cell
To increase the internal resistance of the cell
All of these
The continuity of a winding coil maybe determined by measuring the resistance of the coil. If the resistance reading is infinite, the winding is _____.
Open
In perfect condition
partially shorted
Totally shorted
An instrument used to measure the state of electrical change in a storage battery.
Amprobe
Tachometer
Hydrometer
Calorie Meter
Determine the reactance of a 50 microfarad capacitor at 60 Hz.
18.85 ohms
0.0188 ohms
55.25 ohms
53.05 ohms
In a large alternator, which of the following is normally negligible?
Reactance of winding
Resistance of winding
Impedance of winding
Current of winding
If the two leads of a DC series motor are reversed, which of the following events will happen?
It becomes a generator
It runs in the same direction as before
It will not run
It will run in the reverse direction
Find the amperage of a 5kVA load on a 220-V, three-phase branch circuit?
13 A
8.66 A
12.7 A
22 A
What will happen to the resistance of a conductor when its temperature is increased?
It will increase
It remains constant
It varies
It will decrease
How do you call the electrons in the last orbit of an atom?
Bound electrons
Free electrons
Valence electrons
Charged electrons
A high resistance connected in parallel with a potential relay across a 120-V battery will ____.
Increase the current through a relay
Increase the voltage across the relay
Have no effect on the relay
Make the relay inoperative
A phenomenon on a series AC circuit wherein maximum current will flow.
Avalance
Resonance
Break-even
Breakdown
Which of the following connections would be most likely to injure the instruments attached?
An ammeter in series in the circuit
A voltmeter, connected across the line
An ammeter connected across the line
A voltmeter in series with the line
The rotating part of a DC motor is known as _____.
Pole
Stator
Carbon Brush
Armature
The members of the Board shall hold office for a term of _____ years from date of appointment.
4
3
2
1
Two resistors of resistances 5 ohms and 7 ohms are connected in series across a 60-volt source. What is the power absorbed in the 5-ohm resistor?
50 watts
25 watts
125 watts
100 watts
A measuring instrument used to measure the diameter of circular wires in mils.
Micrometer
Millimeter
Wire gauge
Milliammeter
A secondary cell is charged with a constant current of 10 A for 10 hours. How much charge is accumulated?
100 coulumbs
360,000 coulombs
100,000 coulombs
60,000 coulombs
At starting the motor current is high due to ____.
Counter emf is high
Counter emf is zero
Supply voltage is high
Armature circuit resistance is open
A cell whose emf is 1.45 V has an internal resistance of 4 ohms. What current will flow if this cell is connected across a 1-ohm resistor?
0.4 A
0.2 A
0.5 A
0.3 A
A voltage source of 20 V is applied across the terminals of a 2.5-ohm rheostat. Calculate the power dissipated in the rheostat?
160 W
100 W
150 W
180 W
What would be the advantage of 240 volts rather than 120 volts on the load with the same wattage?
Less power used and less voltage drop
Less power used
Greater voltage drop
Less voltage drop
What is the amperage of a 120 Volt, single-phase circuit that supplies a load of 3.12 kVA?
26 A
30 A
22 A
15 A
During the short circuit test on transformer, which side is short circuited?
High Side
Low Side
Either Sides
Both Sides
Which of the following conductor sizes has the highest resistance?
3.4 mm^2
8.0 mm^2
2.0 mm^2
5.5 mm^2
A device or equipment which is suspended from overhead either by means if a flexible cord carrying the current, or otherwise.
Rosette
Pendant
Fixture
Air terminal
In the schedule of loads for motor circuits, which of the following is not included?
Type of motor
Manufacturer of motor
Motor as numbered in the power layout
Number of phases
What is the allowable ampacity of THW insulated copper conductor with an area of 8.0 mm^2 and exposed to an ambient temperature of 30 degrees celcius?
45 A
20 A
30 A
60 A
Which one is a standard rating of an inverse time CB?
140 A
130 A
120 A
110 A
The term ampere-hour is associated with which of the following?
Converters
Transformers
Electromagnets
Storage Cells
Electrical equipment may best be mounted on a concrete wall by using one of the following. Which one is this?
Wooden plug
Expansion bolt
Load plug
Plastic plug
Before starting any installation work, alteration, repair or extension on any electrical system, what type of permit is needed?
Building permit
Working permit
Electrical Permit
Mayor's Permit
Above ground tanks containing liquids at atmospheric pressure are considered to be protected against lightning i the following requirements are meet. Which one?
The metal roof shall have a minimum thickness of 4.8 mm
The roof shall be wielded, bolted or riveted to the shell
All pipes entering the tank shall be metallically connected to the tank at the point of the entrance
All of these
When computing the service load, more than three fixed appliances are computed with a demand factor of _____ of the nameplate rating.
80%
65%
70%
75%
If the project is extensive and requires more time for checking and for computations of fees, the issuance of the electrical permit need not be issued immediately. However, the delay shall not be longer than how many working days?
7
6
5
8
Splices in ground conductors shall be as few as practicable and shall be attached so as to withstand a pull test of _____.
900 N
880 N
800 N
890 N
Locations which are hazardous because of the presence of combustible dust.
Class I
Class II
Class III
Class IV
If there are three wires of 150 mm^2 connected to one terminal entering a cabinet or a switchboard, the bending space at each terminal shall NOT be less than _____, provided the conductors do not enter or leave the enclosure through the wall opposite its terminals.
200 mm
300 mm
400 mm
250 mm
For an ambient temperature of 30 degrees celcius, a THW insulated copper conductor with a cross sectional area of 3.5 mm^2 and buried underground has the following ampacity. Which one is correct?
20 A
40 A
15 A
30 A
All extended parts located within _____ of the lightning protection system shall be bonded thereto.
1500 mm
1600 mm
1800 mm
2000 mm
Operation at substantially constant load for an indefinitely long time.
Continuous duty
Intermittent duty
Periodic duty
Short time duty
Transformer exceeding 112.5 kVA, shall not be located within _____ from combustible materials of the building.
400 mm
300 mm
200 mm
500 mm
Electrodes of iron or steel plates shall be at least ____ in thickness.
6.4 mm
5.8 mm
6.0 mm
6.2 mm
Advisory rules in the PEC are characterized by the use of what word?
Will
Would
Shall
Should
The frame of the vehicle-mounted generator shall be permitted to serve as the grounding electrode for a system supplied by a generator located on the vehicle under which of the following conditions?
The vehicle of the generator is bonded to the vehicle frame
The generator supplies only equipment located on the vehicle
The non-current carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame
All of these
What is the minimum insulation level (in volts) for the neutral conductors of a solidly grounded system?
600 V
300 V
500 V
1000 V
No boxes shall have an internal depth of less than how many millimeters?
15 mm
10 mm
12 mm
14 mm
Branch circuits are classified according to which of the following?
Voltage across it
Load being served
Power consumed
Setting of the overcurrent device
The following copper conductors have the same cross sectional area but are made up of different number of strands. Which one has the least resistance to AC curent?
19-strand conductor
Single solid conductor
7-strand conductor
37-strand conductor
An appliance, which is fastened or otherwise, secured at a specific location.
Permanent appliance
Stationary Appliance
Portable appliance
Fixed Appliance
What is the minimum insulation resistance required for circuits rated from 201 to 400 A?
25000 ohms
50000 ohms
100000 ohms
12500 ohms
A device capable of drawing lightning discharge to it in preference to vulnerable parts of the protected area.
Air terminal
Lightning trap
Ground mat
Ground terminal
Light fixtures suspended from the ceiling by chains should be wired so that the _______.
Chain is grounded
Wires help support the fixture
Wires will not touch the chains
Wires do not support the fixture
Which of the following Republic Act number refers to the new Electrical Engineering Law?
RA 7920
RA 8450
RA 8710
RA 1840
Cable tray shall NOT be used is which of the following applications?
Hoistways
Dry Locations
Industrial establishments
All of these
A heavy duty lamp holder shall have a rating no less than how many watts?
450 W
500 W
600 W
660 W
In rigid metal conduit wiring, conduits shall be supported at least every ______.
2500 mm
3500 mm
3000 mm
2000 mm
Conductors used in open wiring method within _____ from the floor shall be considered exposed to physical damage.
3000 mm
2500 mm
2000 mm
1800 mm
Conductors normally used to carry current shall be made of _______ unless otherwise provided in the PEC.
aluminum
copper
steel
silver
What is the maximum electrical trade size of intermediate conduit?
150 mm
125 mm
200 mm
100 mm
The Philippine Electrical code is intended for what type of applications by government bodies exercising legal jurisdiction over electrical installation?
Advisory
Mandatory
Optional
Professional
Individual branch circuits using type FCC (flat conductor cable) shall have ratings not exceeding how much amperes?
20 A
30 A
15 A
40 A
Equipment for installation in hazardous locations must be tested and approved for use according to the classification of the hazards involved. These are divided into _____ groups.
4
3
7
6
Aerial cable under non-metallic extensions shall have a clearance of not less than how much from steel structure members or other conductive materials?
60 mm
30 mm
50 mm
40 mm
For all land-based electrical installation under the scope of the PEC, where should an electrical permit be filed?
Department of Energy
Office of the City Engineer
Office of the Mayor
Local Building Office
Compliance with the provisions of the PEC will result in _______.
I. Freedom from hazard
II. Good electrical service
III. An efficient system
I, II, & III
I and II
II only
I only
In an auxilliary gutter, how much is the minimum clearance required between bare current carrying metal parts and any metal surface of the gutter?
26 mm
24 mm
13 mm
12 mm
Heating elements of cables shall be separated at least by how much from the edge of outlet boxes and junction boxes?
200 mm
100 mm
150 mm
300 mm
Auxiliary gutters shall not contain more than _____ current carrying conductors at any cross section.
36
32
30
24
As a rule, no overcurrent device shall be connected in series with any conductor that is _______.
stranded
current carrying
closed
intentionally grounded
Which of the following wires is applicable for underground service entrance conductors?
type THWN
type UF
type MI
type USE
For the purpose of lightning protection, a high rise building is a building with a height over how much?
23 m
50 m
20 m
15 m
What type of electrical conductors has a trade name, moisture resistant thermoplastic?
TW
THW
THWN
All of these
A device used for the purpose of minimizing irregularities in the flow of wielding currents.
Rheostat box
Grounding transformer
Reactor
Inverter
In an automatic FORWARD-REVERSE-STOP star-delta motor controller, how many electrical timers are needed?
At least one
Only one
Two
No timer is needed
