Assorted Terms Flashcards
In series circuit when the voltage remains constant and the resistance increases, the current ________.
A. remains the same
B. decreases
C. increases
D. increases by the square
decreases
Ohms law
An overcurrent trip unit if a circuit shall be connected in series with each ________.
A. grounded conductor
B. overcurrent device
C. transformer
D. ungrounded conductor
ungrounded conductor
Trip para jd sa ungrounded
The rating of the largest size regular plug fuse is ____ amperes.
A. 20
B. 15
C. 60
D. 30
30
Multiple start buttons in a motor control circuit are connected in _____.
A. none of these
B. parallel
C. series-parallel
D. series
parallel
Start sa motor, pwede automatic pwede sikad, so parallel bsag asa
If the end of a cartridge fuse becomes warmer than normal, you should _____.
A. notify the utility company
B. change the fuse
C. lower the voltage on the circuit
D. tighten the fuse clips
tighten the fuse clips
A capacitor opposes _____.
A. change in current
B. none of these
C. change in voltage
D. change in voltage and current
change in voltage
A circuit breaker that has purposely introduced into a delay in the tripping action and which delay decreases as the magnitude of the current increases in a ____ circuit breaker.
A. control vented
B. vented power
C. adjustable
D. inverse time
inverse time
Branch circuit conductors shall have an ampacity not less than _____.
I. the load increased 125%
II. 100% of the load to be served
III. 80% of the load to be served
IV. 125% of the continuous load plus 80% of the non-continuous load
II only
Never approach a victim of an electrical injury until you ____.
A. find a witness
B. contact the supervisor
C. have a first-aid kit
D. sure the power is turned off
sure the power is turned off
When installing an instrument meter on a panel, to obtain accurate mounting _____.
A. drill oversize holes
B. drill from back of the panel
C. use the meter and drill through the holes
D. use a template
use a template
The usual service conditions under which a transformer should be able to carry its rated load are ____.
I. at rated secondary voltage or not in excess of 105% of the rated value
II. at rated frequency
II. temperature of the surrounding cooling air at no time exceeding 400C and average temperatir of the surrounding cooling ari during any 24 hour period not exceeding 300 C
I, II, and III
The greatest voltage drop in a circuit will occur when the ______ the current flow through that part of the circuit.
A. slower
B. lower
C. greater
D. faster
greater
Greater current= greater drop, I²
Copper-clad aluminum conductors have a ampacity ____.
A. rating of their own
B, equal to copper
C. equal to aluminum
D. lower than copper but higher than aluminum
equal to aluminum
Alu ghapon, gi clad lng
What refers to the ratio of thermal conductivity of a material to the product of electrical conductivity and temperature?
A. Matthiessens’ ratio
B. Wiedermann’s-Frantz ratio
C. Conductivty ratio
D. Maxwell’s ratio
Wiedermann’s-Frantz ratio
Puro conduct so, WF
When voltage and current appear at their zero and peak values at the same time, they are in ____.
A. group
B. balanced
C. motion
D. phase
phase
Insulated nonmetallic boxes are made of
I. polyvinyl chloride
II. bakelite
III. Bower-Barff lacquer
I and II only
Tinning rubber insulated twisted cable is done to ____.
I. make the strand stronger
II. prevent chemical reaction between the copper and the rubber
III. increase the resistance
IV. meet NEMA requirements
II only
A laminated pole is _____.
I. one built up of layers or iron sheets,stamped from sheet metal and insulated
II. used in transmission lines over 100kv
III. a pole soaked in creosote
IV. found in the north pole
I only
Fixtures supported by the framing members of suspended ceiling system shall be securely fastened to the ceiling framing memeber by mechanical meas such as _____.
I. bolts or screws
II. rivets
III. clips identified for this use
I, II, and III
Hysterisis is
I. the tool used to read the specific gravity of battery
II. the lagging of magnetism, in a magnetic metal, behind the magnetizing flux which produces it.
III. the opposition of impedance
IV. none of these
II only
The Code rule for maximum 900 bends in a conduit between two boxes is four, the most likely reason for the total 3600 limitation is
I. it is unsafe
II. it makes pulling the conductors throught the conduit too difficult
III. you can damage the galvanized coating on the conduit
Iv. too many bends require extra wire to be pulled
II only
For an unbalanced 3 phase load, which connection is suitable?
A. 3 wire, open delta
B. Three wire, wye
C. Four wire, wye
D. 3 wire, delta
Four wire, wye
For neutral
Which of the following transformer has only one winding?
A. Current
B. Distribution
C. Autotransformer
D. Power
Autotransformer
ANSI Device No. 21
A. Distance Relay
B. Frequency Relay
C. Overcurrent Relay
D. Undervoltage Relay
A. Distance Relay
The distributor shall design and operate its system to assist the system operator on maintaining its fundamental frequency within the limits of __ Hz to __ Hz during normal conditions.
A. 59-60
B. 59.7-60.3
C. 58.3-60.3
D. 59.3-50.3
B. 59.7-60.3
A generating unit providing backup reserve shall have a fast start capability and its capacity shall be sustainable for a minimum period of __ hours.
A. 5
B. 8
C. 10
D. 12
B. 8
For planned outages, customers or users shall be notified at least __ days prior to the loss of power.
A. 3
B. 5
C. 6
D. 10
A. 3
3 for distribution side
7 for transmission side
For which of the following sinusoids, the rms value and mean value is the same?
A. Sine wave
B. Triangular wave
C. Square wave
D. None of the above
C. Square wave
Slip rings are made of
A. Steel
B. Copper
C. Bakelite
D. Mica
Cooper
Merz price protection is used on
A. Substations
B. Capacitor Banks
C. Induction motors
D. Generators
Generators
A __ is a device that carry and interrupt load current even in case of a fault by used of
separate contacts.
A. Air switch
B. Fuse
C. Sectionalizing
D. Circuit breaker
Circuit breaker
Contact breakers
What is the process of heating electrically non-mettalic materials such as plumbers,
plastics, etc
A. Resistive
B. Capacitive
C. Dielectric
D. Induction
Dielectric
Non-metalic so dielectric
How are multiple stop push buttons connected in a control circuit
A. Series-parallel
B. Parallel
C. Gang
D. Series
Series
What electrode in a junction transistor corresponds to the cathode in vacuum tube
A. Base
B. Emitter
C. Drain
D. Collector
Emitter
Cathode-emitter
An SCR combines the feature of
A. Rectifier and resistance
B. Rectifier and capacitor
C. Rectifier and transistor
D. Rectifier and inductor
Rectifier and transistor
Name of the transformer that provides an almost continuously variable stepless output voltage from 0 to rated line voltage
A. Booster
B. UPS
C. AVR
D. Variac
Variac
Variable, variac
What is the maximum allowable voltage drop for lighting circuit
A. 3%
B. 5%
C. 2%
D. 10%
3%
What is the maximum allowable voltage drop for feeders
A. 1%
B. 2%
C. 3%
D. 5%
5%
Feeder, F, Five
The unit of magnetic field intensity in the CGS system is
A. Gauss
B. Ampere-turn per meter
C. Gilbert
D. Oersted
Oersted
IO, intensity-oersted
The rapid failure caused by the hear of an arc on the conductor surface accompanied by the heating effect of short circuit
A. Fault current breakdown
B. Current limit value
C. Arc current breakdown
D. Fault current limit
Fault current breakdown
Short- fault
Failure- breakdown
What is the most common cause of failure in cable termination and insulation
A. Tracking
B. Poor shielding
C. Wrong clearance
D. Improper insulation penciling
Improper insulation penciling
Sayop tahal
A freshly paint layer may be dried electronically by __ heating
A. Emissive
B. Dielectric
C. Induction
D. Convection
Induction
PI, paint Induction
Prior to starting of fluorescent lamp, heating of electrode is done by
A. Starter
B. Ballast
C. Filament
D. Heater
Ballast
Paminaw sa illumination na klase
What is the barrier potential of a germanium diode at room temperature
A. 0.3 V
B. 0.7 V
C. 1.1 V
D. 1.2 V
0.3V
Paminaw lge sa klase sa ece
While describing the sheath of a cable, the abbreviation XLPE means __ polyethylene
A. Cross layer
B. External layer
C. Cross linked
D. Extra long
Cross linked
A permanent slip single phase capacitor motor does not have
A. Centrifugal switch
B. Start winding
C. Squirrel cage motor
D. High power factor
Centrifugal switch
Single so way center, di ni mao buot2 ra
The sparking at the brushes of a dc generator is due to
A. Reactance voltage
B. Armature reaction
C. Light load
D. High resistance at the brushes
Reactance voltage
Ni spark kay nireact
A fuse is a __ device
A. 3-phase terminal
B. 1-phase terminal
C. 3-phase protective
D. 1-phase switching
1-phase terminal
Which of the following types of heating process is used for surface hardening of steel
A. Resistance
B. Dielectric
C. Induction
D. Infrared
Resistance
Metal so naay resistance
What is the minimum clearance between the recessed incandescent fixture and the
nearest point of a storage space of closet
A. 100 mm
B. 150 mm
C. 200 mm
D. 250 mm
150mm
If the speed of an induction motor increases, what happens to the motor frequency
A. Increases
B. Decreases
C. Does not change
D. No relation at all
Decreases
Induction motor, s = k/f
Wind mils in addition to proper gearing is the best driver for
A. DC generator
B. Synchronous Generator
C. Induction Generator
D. Rotary Rectifier
Induction generator
wInd, Induction
The dc generator used as a pilot exciter is
A. Series
B. Shunt
C. Over compound
D. Flat compound
Flat compound
Laki kasagaran pilot, so flat
When a carrier wave is modulated at 100%, its power is increased by __ percent
A. 100%
B. 150%
C. 50%
D. 0%
50%
Carrier ramn, so mo kikik pa, maong tunga nalng
Differential relays are used to protect the equipment against
A. Reverse current
B. Internal faults
C. Overcurrents
D. No voltage
Internal faults
If the supply voltage is changed by 5% for a 3 phase induction motor, its torque will have a change of
A. 5%
B. 10%
C. 25%
D. 20%
10%
Which of the following is not a part of the megger
A. Handcrank
B. Moving coil meter
C. Coil of high inductance
D. Gear box generator
Handcrank
In a series RL circuit, the inductor current __ the resistor current
A. lags
B. leads
C. equal to
D. negative of
Equal
Open conductors run individually as service drops shall be.
I. Insulated. II. Bare. III. Covered
Either I or II
The direction of rotation of a series dc motor can be reversed by interchanging the
A. Supply terminals
B. Field terminals
C. Supply and field terminals
D. None of these
Field terminals
Very large 3 phase induction motor (larger than 25 hp) are started by:
A. Direct starting
B. Autotransformer starting
C. Star-delta starting
D. Primary resistance starting
Autotransformer starting
What is the common method of cooling power transformer
A. Air cooling
B. Oil cooling
C. Air blast cooling
D. Natural cooling
Oil cooling
Which material is used as a moisture absorber in the transformer breathing
A. Calcium carbide
B. Calcium sulfide
C. Calcium chloride
D. Calcium carbonate
Calcium Chloride
A wattmeter is installed in a balanced 3 phase system with current coil at line a and
voltage coil across lines b and c. The wattmeter will measure _ power
A. Total
B. Active
C. Reactive
D. Real
Reactive
Electrodes permitted for grounding are the following except __
A. Underground water metal pipe
B. Concrete encased electrode
C. Metal frame of building electrode
D. Metal underground gas piping system
Metal underground gas piping system
What is the voltage used in LCD monitor
A. Low dc voltage
B. High dc voltage
C. Low ac voltage
D. High ac voltage
Low dc voltage
In dc motors, carbon brushes are preferred than copper brushes because
A. They are stronger
B. They produced less arcing
C. They have low loss
D. All of the above
They produced less arcing
At least __ mm of free conductor, measured from the point in the box where it emerges from its raceway shall be left at each outlet, junction, and switch point for splices or connection to fixtures or devices
A. 150
B. 200
C. 300
D. 500
150
SAIDI in EPIRA means
A. System average interruption duration index
B. System average interruption distribution index
C. System average interruption demand index
D. System average interruption difference index
System average interruption duration index
Minimum thickness of concrete in a concrete encased electrode is __ mm
A. 80
B. 60
C. 70
D. 50
50
A device which serves to govern in some predetermined manner the electric power
delivered to the apparatus to which it is connected with is called
A. Switch
B. Feeder
C. Relay
D. Controller
Controller
It is a general term including material, fittings, devices, appliances, fixtures, apparatus
and the like used as part or in connection with an electrical insulation
A. Wiring system
B. Utilization equipment
C. Service equipment
D. Equipment
Equipment
It is a term for devices that utilizes electric energy for a purpose like motors, furnaces,
heaters, light source and the like is:
A. Wiring system
B. Utilization equipment
C. Service equipment
D. Equipment
Utilization equipment
The maximum torque that allows a synchronous motor to remain in synchronism is
A. Pull-in torque
B. Pull-out torque
C. Brake-in torque
D. Brake-out torque
Pull-out torque
Conductors after the final overcurrent device and before the load served
A. Branch circuit conductor
B. Service conductor
C. Feeder conductor
D. None of these
Branch circuit conductors
What rule is used to determine the direction of the induced or generated current within the conductor
A. Flemings left hand rule
B. Flemings right hand rule
C. Lenz law
D. Faradays la
Flemings right hand rule
In a dc motor, which of the following does not cause sparking in the commutator
A. No load on the output leads
B. Frozen armature
C. High brush contact resistance
D. Graphite brushes with good contact pressure
High brush contact resistance
What is the maximum number of conductors permitted in a wireway at any cross-section, signal circuit or starter-control wires are not included?
A. 30
B. 40
C. 50
D. 100
30
Where multiple rod, pipe or plate electrodes are installed to meet the requirement of PEC, they shall not be less than ___ mm apart.
A. 1900
B. 1800
C. 1500
D. 2000
1800
The PEC has assigned thr color __to the high leg of a four wire delta connected secondary
A. Black
B. Green
C. Orange
D. Red with green tracer
Orange
The residual voltage of a capacitor shall be reduced to _ volts, nominal, or less with ___
minute/s after the capacitor is disconnected from the source of supply
A. 0, 5
B. 15, 2
C. 30, 3
D. 50, 1
50, 1
Conductors ____ and larger shall be stranded when installed in raceways
A. 3.5 mm²
B. 5.5 mm²
C. 8.0 mm²
D. 30 mm
8.0 mm²
What is the relative permittivity of vacuum?
A. Unity
B. 8.854x10-¹²
C. 8.854
D. Zero
Unity
The law that induces emf and current always oppose the cause producing the was discovered by
A. Faraday
B. Maxwell
C. Lenz
D. Ohm
Lenz
Which of the following cannot have a single unit of 100
MW?
A. Hydro power plant
B. Steam power plant
C. Diesel power plant
D. Nuclear power plant
Diesel power plant
“The sum of the currents into a junction equals the sum of
the currents out of the junction” is a consequence of:
A. Newton’s third law
B. Ohm’s law
C. conservation of energy
D. conservation of charge
Conservation of charge
The amount of frequency deviation from the carrier center
of frequency in an FM transmitter is proportional to the
_______________.
A. Shape
B. amplitude
C. frequency
D. phase
Amplitude
The applied voltage in a transformer is increased by 50%
and frequency is reduced by 50%. The maximum core flux
density will become______.
A. Same
B. 1.5 times
C. 3 times
D. 5 times
3 times
The maximum core flux density in a transformer is directly proportional to the V/f ratio.
Where V is the supply voltage and
f is the supply frequency
Calculation:
Given that, the applied voltage of a certain transformer is increased by 50% while the frequency is reduced by 50%.
V2 = 1.5 V1 and f2 = 0.5f1
Therefore, the V/f ratio will becomes three times and hence the maximum flux density will also become three times
In a two wattmeter method of measuring, balanced 30 power, the reading of one of the wattmeters is twice to that of the other when,
A. pf is unity
B. pf is 0.707
C. pf is 0.866
D. a neutral wire
is provide
pf is 0.866
