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159 Cards in this Set
- Front
- Back
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____ used to prevent motorizing of generator |
Reverse power relay |
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Not belong to the technical performance of standards of PDC |
Collection efficiency |
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Not consideration of surge arrester |
Insulation coordination |
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Not factor in determining speed of motor |
Thickness of commutator bars |
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Used to prevent motorizing of the generator |
Reverse power relay |
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The technical performance standard of the philppines distribution code |
Collection efficiency |
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Calculation of the reliability standard undices of the ditributor asset by the philippine distributiin code |
Outage that occur on the primary lines of the distribution system |
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Which othe following is not consideration in surge arrester |
Insulation coordination |
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Diesel power plant is best suited as |
Standby |
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Carry and interrupt load current even in case of a fault by used of seperate contact |
Circuit breaker |
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Purpose of performance standard for distribution of the philippine distibution code |
To facilitate the monitoring of complience with the distribution code at the operations level |
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Source of noise in a communication system |
Manufacture electical equipment |
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The electric motor generally used in household food mixer |
Split phase |
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Which of these is not an objective of GRID planning |
Timing |
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The current transformer secondaries of wye-delta power transformer will be in |
Delta-wye |
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From the carrier center of frequency in an FM transmiter is promotional to the |
Amptitude |
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Interupe a circuit at a certain fault current level |
Total clearing |
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In conjuction with other meter devices can be used to determine the factor |
Power |
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Autimatically trips and recloses a presset number of times to clear temporary fault or isolate permanent fault |
Circuit recloser |
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Used for finding short circuited coil is called a/an |
Growler |
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Which is not a semicinductor |
Silica |
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The earth to discharge the charge on the conductor on the earth is called |
Earthing switch |
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Having a voltage coil and current coil with be a |
Wattmeter |
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Variable inductance which can be increased by |
Saturating the core |
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Buttons are added to an existing starter control curcuit they must be |
Series with the cintactor coil |
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A freshly paint layer may be dried electronically by heating |
Conductor |
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The grid owners as set by philippine grid code shall include outage that occur |
On the transmission line |
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An ampere is how many abapere |
-0.1 |
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The rapid failture caused by the heat of an arc on the conductor surface accompanied by the heating effect f short circuit |
Fault current burndown |
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What is purpose if air blower In substation transformer |
To increase the capacity |
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Which is the safest type of insolation for indo wiring installing specially residential and commercial building |
Ethylene propylene rubber |
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Name the throw away protection device |
Fuse |
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Who developed the wireless transmission in 1897 |
Henrich hertz |
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What effect or princeple those of a microphone operate |
Piezeolectric |
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What would happen if you connect a transformer to a DC circuit with a voltage of 20% of nameplate rating after a steady state condition is reached |
No voltage is registered at secondary |
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For indoor lawn tennis what is the recomended level of illumination for turnaments in foot candles (fc) |
50 |
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Name the voltage class when the nominal voltage range is 120 - 600 volts |
Low voltage |
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Where else is the third wire in the service conductor terminated aside from the S/N of the panelboard |
Ground rod |
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An instruments applied to a simple structural number to messure stretch or extension in a certain direction over a definite distance called the gauge lenght |
Strain gauge |
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Magnetic induction can be expressed equally well except one of the following |
Magnetic field |
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If the reverse bias voltage of a PN junction is increased within the limits the reverse saturation current will |
Remain an affected |
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Which of the following types of heating process is used for surface hardening of the steel |
Infrared |
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What is the peak factor of a traingular wave |
1.73 |
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The equipment grounding conductor is required to be in the same metal enclosure as the circuit condctor to protection against |
Surge current in metal enclosure |
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What contains in each cell site of cellular telephone system |
Direct link to branch |
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The power generated by some steam power planta drops in the summer because |
The lake temperature increases |
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An emf induced in a coil due to change un a current a neigboring coil is known as emf |
Mutualy induced |
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With reduction of load on alternator |
The frequency increase |
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What is the difference between a refrigerator and air conditioner |
I only ( A refrigerator Takes away heat from a refrigerated space while an air conditioner takes away heat from a living space) |
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With reduction of load on alternator |
The frequency increaces |
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What is the difference between a refrigerator and air-conditioner |
I only (A refrigerator takes away heat from a refrigerated space while an air-condetioner takes away heat from a living space |
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In TV transmission picture signal is modulated |
Amplitude |
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What is the device function number of directional power relay |
32 |
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Which is not included in a basic communication circuit |
Communication chanel |
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Where the surge arrester must be place |
Near transformer |
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____is the overall energy program formulated and updated yearly by DOE submited to congress pursuant to R.A 7638 |
Energy plan |
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In a resistant welding the SCR is closed during _____time |
Squeeze weld and hold |
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Electrical continuity is required by the philippine electrical code metalic conduit |
To assure equipment grounding |
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The turn-on voltage of a Ge junction diode is volt |
0.3 |
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A permanent -split single- phase capacitor motor does not have |
Centrifugal switch |
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The sparking at the brushes of a dc generator is due to |
Reactant voltage |
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Buchholz relay is a |
Gas actuated device |
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In here does a bonding jumper is connected |
Equipment enclusure |
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What is the primary advantage of FM over AM |
Noise immunity |
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Floor receptacle outlets are not counted unless they are within a distance of mm from the wall |
450 |
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When a welding transformer is used in a resistance welding it will |
Step up current |
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Grounding allows _____ opposition path of current flow |
Low |
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Moving coil instruments are used |
In dc circuit only |
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The efficiency of thermal plant is aproximately_____ |
30% |
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Merz-price protction is used in |
Substation |
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The greater percentages of a material are ______ |
Paramagnetic |
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The greater percentages of power loss in dc motor is due to |
Copper loss |
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The process by which metallic parts are demagnetize is called |
Degaussing |
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The gas inside the inner discharge tube of a sodium vapor lamp is |
Neon |
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What is the nature of the current lowing in the amature of dc machine |
Alternating current |
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Skin effect is proporsional to |
Diameter of conductor |
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Permeance is analogous to |
Conductance |
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Surge impedence of transmission line is given by |
√L/C |
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Which of the follwing is not a type of condutor for circuit breakers |
Vacuum |
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Charging a lead acid cell causes the electrolyte to become |
Stronger |
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The luminous intensity of a lamp is expressed in a |
Candela |
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Ten oersted is equivalent to |
10Gb/cm |
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The barrier potential for a sillicon diode at 25°c approximately |
0.7v |
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If the input of the prime mover of an alternator is kept constant but the excitation is increased then |
KVA will be lagging |
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The useful of a diesel engine un a power plant is expected to be ___ year/s |
15 |
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An automatic device that operates at preser values is known as |
Relay |
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A magnetic field exist around |
Moving charges |
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Which of the following produces a reactive power |
Induction motor |
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Receptacle outlets shall be located above but more the counter top |
500 |
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In dwelling units hallways of a_____ m or more in length shall have at least one receptacle outlets |
3 |
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The time constant of a series RL circuit is equal to _______ |
L/R |
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This is the least prevelent fault among transmission and distribution lines |
LLL |
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In what years was the first 500 kV line in the world become operational |
1965 |
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This is a lighting system wherein the percentage of upward ang downward brightness is the same |
General difuse |
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One ampare-turn is equivalent to gilberts |
1.26 |
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Which motor is used to start heavy loads |
Series |
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The capacitor in a capacitor start induction run ac motor is connected in a series with winding |
Starting |
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Power circuit breaker can be classified according to operation some of these are exept |
Inclined break |
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The lowes KAIC available commercialy for for miniature circuit breaker is |
Five |
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The effect of the dielectric is to |
Reduce the working voltage |
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Sparking occurs when a load is switched off because the circuit has high |
Inductance |
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Rapid stopping of a motor by momentarily connecting the motor reverse direction is called |
Pluging |
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The charge of a hole is ______ |
Equal to that of a protonk |
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Transiant current in an RLC circuit is oscillatory when |
R < 2 √L/S |
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A load of an alternator becomes more leading value of the generated voltage required to give rated terminal voltage |
Decreases |
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The device is used to reflect back surges in to the line |
Choke coil |
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Some of the arrangments for switch/panel boards are as follows exept ______ |
Vertical |
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The fuse used for the over head primary distributors is |
Expulsion |
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The fuse used for the over head primary distributors is |
Expulsion |
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Porcelain insulator are protected against creepage of surge current by the use of |
Arcing horns |
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Moving coil instruments are used |
In dc circuit only |
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The efficiency of thermal plants is approximately |
30% |
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Merz -price protection is used on |
Substation. |
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The greatest percentage of a materials is |
Paramagnetic |
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The greatest percentage of power loss in dc motor is due to |
Copper loss |
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The three primary colors in the chrominance signal of a color TV |
Red-green-blue |
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An alternator running in parallel with other alternators all having an authomatic Voltage regulator is to be taken off the bus. The usual procedure before opening the switch is to |
Reduce the power fed to the prime mover |
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Which one of the following is not one of the relays of transmision lines |
Negative sequence relay |
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The area of the hysteresis loop of the measure of |
Energy loss per cycle |
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Slip rings are made of |
Copper |
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Overvoltage relay device function number |
59 |
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A test used to determine the equivalent resistance of an induction motor is |
Block-rotor test |
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The unit retentivity is |
Ampere turn/weber |
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In running condition the motor reactance 3 phase induction motor is prportional to |
Slip |
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The ratio of the total flux to useful flux is called |
Leakage factor |
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With reduction of load on alternator |
The frequency increases |
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Which of the following ammeters is the most sensitive |
0-1 micro meter |
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Brushes of dc machine are usually made of |
Carbon |
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Impurities in an electrolyte can cause an internal short circuit condtion called |
Local action |
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In transmission voltage levels 765 kV us categorize as |
Extra high voltage |
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The efficiency of thermal plant is approximately |
30% |
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The lightning load for a dwelling expressed in terms of a unit load in volt-ampere per square meter must be atleas |
24 |
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What do you call the interior lighting where the roof trusses ceilling height is greater than 7.6 m above floor level |
High mast |
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Which of the following common electronic components is not found in ICs |
Inductors |
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____are auxilliary transformers used fr metering or operation auxilliary equipment and relays |
Current transformers |
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An electrical outlet constructed so that moisture will not enter the enclosure is clasified as being |
Watertight |
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The commonly used light sensor in a modern fax machine is the |
Charge couple device |
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What is the device function number of an ac circuit breaker |
52 |
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Which of the following cannot have a single unit of 100MV |
Diesel power plant |
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What is the full load effiency of a power transformer |
0.98 |
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A/an ____ relay that operates or pick up when its current exceeds pre-determine value |
Over current |
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The primary fuction of a fuse is to ____ |
Protect the line |
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A type of electronics communication in which only one part transit at a time |
Haft duplex |
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The correct word to define wiring which is not concealed is |
Exposed |
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When luminairse direct 90-100% of there output upward is considered a |
Indirect lighting |
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In a resistance welding the pneumatic pressure is applied during ___time |
Squeeze weld and hold |
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Is known also cold standby time reserved |
Contingency reserve |
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Transformer taps are generally on the ____ of transformer |
High voltage winding |
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A thermal protection switch is able to protect a circuit against _____ |
Over load |
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With reduction of load on alternator |
The frequency increases |
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A gang capacitor is a variable capacity in which capacitance is varied by chaging the |
Plate area |
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When electrons build up pressure at one point is a called |
Current flow |
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Fermi energy is the amount f energy which ____ |
Must be given to an electron to move it to conduction band |
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If the dc Current is reserved in a control winding of a saturable reactor |
Same ac current will flow |
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The over current protective device is caused to operate by |
Current flow |
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Luminaire types permited in clothes closet |
Surface mounted or recessed in candescent fixture with a completly enclose lamp |
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Current reactors a resistance are used to |
Bring down the fault level within the capacity |
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Overcurrent protection respond to |
Increase in current above the pick up value |
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What is the maximum allowable continous load for branch circuit conductor |
0.8 |
