NEW
Font size
WorksheetsRME_Chapter 1
Total questions: 50
Worksheet time: 50mins
Automatic device that operates at preset values is known as .
relay
mercury switch
contactor
fuse
A device used for the purpose of minimizing irregularities in the flow of welding currents.
Rheostat box
Grounding transformer
Reactor
Inverter
Individual branch circuits using type FCC (flat conductor cable) shall have ratings not exceeding how much amperes?
20 A
40 A
15 A
30 A
Which of the following is a unit of electrical pressure?
Watt
Ampere
Ohm
Volt
An appliance, which is fastened or otherwise, secured at a specific location.
Fixed appliance
Stationary appliance
Portable appliance
Permanent appliance
Which one is a standard rating of an inverse time CB?
130 A
110 A
120 A
140 A
A measuring instrument used to measure the diameter of circular wires in mils.
Milliammeter
Millimeter
Micrometer
Wire gauge
If the two leads of a dc series motor are reversed, which of the following events will happen?
It will not run
It will run in the reverse direction
It becomes a generator
It runs in the same direction as before
A universal motor can be operated on which of the following supply currents?
ac or dc currents
dc current only
ac current only
3-phase ac current only
What is another name for a secondary cell?
Storage cell
Dry cell
Disposable cell
Wet cell
What component of an atom that doesn't have any electrical charge?
Ion
Electron
Proton
Neutron
An electric iron takes 3 ½ A. If the heating element has a resistance of 40 ohms, what is its power consumption?
0.35 kW
0.45 kW
0.49 kW
0.51 kW
A phenomenon on a series ac circuit wherein maximum current will flow.A. B.C. D.
Avalanche
Break-even
Resonance
Breakdown
What would be the advantage of 240 volts rather than 120 volts on the load with the same wattage?
Less power used
Greater voltage drop
Less power used and less voltage drop
Less voltage drop
Above ground tanks containing liquids at atmospheric pressure are considered to be protected against lightning if the following requirements are meet. Which one?A. . C. D.
The roof shall be welded, bolted or riveted to the shell
All of these
The metal roof shall have a minimum thickness of 4.8 mm
All pipes entering the tank shall be metallically connected to the tank at the point of entrance
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?
All of these
The non-current carrying metal parts of equipment and the equipment grounding conductor terminals of the receptacles are bonded to the generator frame
The generator supplies only equipment located on the vehicle
The vehicle of the generator is bonded to the vehicle frame
A heavy duty lamp holder shall have a rating no less than how many watts?
660 W
600 W
500 W
450 W
Heating elements of cables shall be separated at least by how much from the edge of outlet boxes and junction boxes?A. B. C. D.
100 mm
200 mm
300 mm
150 mm
What type of electrical conductors has a trade name, moisture resistant thermoplastic?A. B. C. D.
THW
All of these
TW
THWN
Equipment for installation in hazardous locations must be tested and approved for use according to the classification of the hazards involved. These are divided ingroups.
3
7
6
4
What is the minimum insulation resistance required for circuits rated from 201 to 400 A?
50, 000 ohms
25,000 ohms
12,500 ohms
100,000 ohms
Transformer exceeding 112.5 kVA, shall not be located within from combustible materials of the building.A. B.C. D.
500 mm
400 mm
300 mm
200 mm
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 current?A. B. C. D.
37-strand conductor
19-strand conductor
Single solid conductor
7-strand conductor
In rigid metal conduit wiring, conduits shall be supported at least every .
3,500 mm
3,000 mm
2,000 mm
2,500 mm
Aerial cable under non-metallic extensions shall have a clearance of not less than how much from steel structure members or other conductive materials?
40 mm
50 mm
30 mm
60 mm
For the purpose of lightning protection, a high rise building is a building with a height over how much?
15 m
70 m
50 m
23 m
For all land-based electrical installation under the scope of the Philippine Electrical Code, where should an electrical permit be filed?
Local Building Office
Office of the Mayor
Office of the City Engineer
Department of Energy
Conductors used in open wiring method within from the floor shall be considered exposed to physical damage.
1,800 mm
2,000 mm
2,500 mm
3,000 mm
A device capable to drawing lightning discharge to it In preference to vulnerable parts of the protected area.
Ground terminal
Ground mat
Lightning trap
Air terminal
What is the minimum insulation levels (in volts) for the neutral conductors of a solidly grounded system?
300V
600V
1,000V
500V
If there are three wires of 150 mm2 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
400 mm
250 mm
300 mm
Electrical equipment may best be mounted on a concrete wall by using one of the following. Which one is this?
Expansion bolt
Wooden plug
Plastic plug
Load plug
During the short circuit test on transformer, which side is short circuited?
High side
Either sides
Both sides
Low side
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?
0.2 A
0.3 A
0.5 A
0.4 A
Which of the following connections would be most likely to injure the instruments attached?
An ammeter in series in the circuit
An ammeter connected across the line
A voltmeter in series with the line
A voltmeter connected across the line
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 internal resistance of the cell
To increase the capacity of the cell
All of these
When using ohms law E divided by I would solve for .
watts
resistance
voltage
amperage
Multimeters consist of a . . .
voltmeter, current meter and an ohmmeter
current meter and an ohmmeter
voltmeter and current meter
voltmeter and an ammeter
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
zero
infinity
In resistance color coding, red color is assigned to what value?A. 3B. 0C. 2D. 1
3
1
2
0
What is another name for full voltage starting?
Direct on line
Starting without a contactor
Reduce voltage starting
Pull load starting
Excitation current is used in which of the following motors?
Squirrel cage motors
Induction motors
Synchronous motors
Wound rotor motors
On a simple ohmmeter, the zero ohm mark is of the scale.
far right
in the right
far left
none of these
An instrument used to measure the state of electrical charge in a storage battery
Hydrometer
Calorie meter
Amprobe
Tachometer
A high resistance connected in parallel with a potential relay across a 120-V battery will .
make the relay inoperative
increase the voltage across the relay
increase the current through the relay
have no effect on the relay
When computing the service load, more than three fixed appliances are computed with a demand factor of of the nameplate rating.
70%
75%
80%
65%
Operation at substantially constant load for an indefinitely long time.
Periodic duty
Short time duty
Continuous duty
Intermittent duty
As a rule, no overcurrent device shall be connected in series with any conductor that is .
current carrying
intentionally grounded
closed
stranded
The Philippine Electrical Code is intended for what type of applications by government bodies exercising legal jurisdiction over electrical installation?
Professional
Optional
Mandatory
Advisory
Light Fixtures suspended from the ceiling by chains should be wired so that the
wires do not support the Fixture
wires will not touch the chains
chain is grounded
wires help support the Fixture
