ELECTRICAL 7

Gaviola Jayson, Alab · 100問 · 2年前

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Impurities in an electrolyte can cause an internal short circuit condition called

local action

the turn on voltage of a Get Junction diode is ___ volt

mode of communication in which either party can hear while talking does allowing one party to instantly interrupt to the other at any time is called

full duplex

a device that repeatedly reverses the polarity of a magnetic field in order to keep a dc motor rotating is known as

commutator

87 is the device function number assigned by ansi to this relay

differential relay

wind mill in addition to proper gearing is the best driver for

induction generator

the dc generator used as pilot exciter is

flat compund

bundled conductors in ehv transmission lines results to

increase capacitance

the surge impedance of an underground cable is around

50 ohms

a contact device installed at the outlet for the connection of a single attachment plug

receptacle

when carrier wave is modulated at 100% it's power is increased by ___ percent

Differential relays are installed to protect the equipment against

internal faults

this is the porcelain insulator for the end poles

suspension

farad is equivalent to what unit

coulomb/volt

which of the following is used in power factor correction

synchronous motor

the lighting load for a dwelling expressed in terms of a unit load in volt-ampere per square meter must be at least

which pf the following is used for power factor correction

synchronous motor

what do you call the interior lighting where the roof trusses or ceiling height is greater than 7.6m above floor level

high bay

which of the following is a vector quantity

magnetic flux intensity

the electrical safety month of the year is

may

which of the following produces a reactive power

induction motor

heating effect of current has undesirable side effect in

vacuum cleaner

In two -wattmeter method the readings of the wattmeters will be identical when

power factor is unity

an electric current can neither be___ nor___

seen, touched

In transmission voltage levels 756kV is categorized

Extra High Voltage

The purpose of a grid system is to

interconnected the power stations

the efficiency of thermal plant is approximately

30%

the number of parallel paths in a simplex lap winding is equal to

number of poles

If the input of the prime mover of an alternator is kept constant but the excitation is increased then

kVA will be lagging

the useful life of a diesel engine in a power plant is expected to be

An automatic device that operates at preset value is known as

relay

a magnetic field exist around

moving charges

which of the following is not a type of thew contactor for circuit breaker

vacuum

charging a lead-acid cell causes the electrolyte to become

stronger

if the resistance of the field winding of a dc generator is increased the output voltage will

decrease

wye-wye power transformers are protected by current transformers having___ connection

delta delta

the luminous intensity of a lamp is expressed in

candela

Ten oersted is equivalent to

10 Gb/cm

which of the following ammeters is the most sensitive

0-1 micro meter

Brushes of dc machine are usually made of

carbon

Impurities in an electrolyte can cause an internal short circuit called

local action

what is the minimum number of wattmeters required to measure unbalanced power for a three phase system

permeance is analogous to

conductance

overvoltage relay device function number

a test used to determine the equivalent resistance of an induction motor

blocked-rotor test

the unit of retentivity

ampere turn/weber

the ratio of the total flux to useful flux is called

leakage factor

with reduction of load on alternator

the frequency increases

the process by which mettalic parts are demagnetized is called

degaussing

the gas inside the inner discharge tube of a sodium vapor lamp is

neon

what is the nature of the current flowing in the armature of dc machine

alternating current

which of the following frequencies has the longest period

1 Hz

What is the purpose of using oil in the transformer

cooling and insulation

skin effect is proportional to

(diameter of conductor)²

the three primary colors in the chrominance signal of color TV are

red green blue

an alternator running in parallel with other alternators all having automatic voltage regulators is to be taken off the bus the usual procedure before opening the switch is to

reduce the power fed to the prime mover

which one of the following is not one of the relays of transmission line

negative sequence relay

the area of hysterisis loop is the measure of

energy loss per cycle

slip rings are made of

copper

moving coil instrument are used

in dc circuits only

the efficiency of a thermal plant is ___ %

Merz Prize protection is used on

substations

the greater percentage of materials are

paramagnetic

the greatest percentage of power loss in dc motor is due to

copper loss

the charge of a hole is

equal to that of a proton

as load pf of an alternator becomes more leading the value of the generated voltage required to give rated terminal voltage

decreases

some of the arrangement for switch panel boards are as follows except

vertical

the fuse used for the overhead primary distribution is

expulsion

porcelain insulators are protected against creepage of surge current by the use of

arcing horns

this is a lighting system wherein the percentage of upward and downward brightness is the same

general diffuse

one ampere turn is equivalent to ___ gilberts

1.26

which motor is used to start heavy loads

series

the capacitor in a capacitor start induction run ac motor is connected in series with___ winding

starting

power circuit breakers can be classified according to operation some of these are, except

inclined break

the lowest KAIC available commercially for miniature circuit breakers is

this is the least prevalent shunt fault among transmission and distribution line

LLL

In what year was the first 500kV line in the world was operational

1985

a standard candle emits a total luminous flux of ____ lumens

12.57

when a welding transformer is used in a resistance welding it will

step up current

Grounding allows _____ opposition path of current flow

low

when the temperature of the wire increases what happens to the resistance

increases

what is the maximum allowable continous load for branch circuit conductors

0.8

In PEC 1 where does the bonding jumper is connected

equipment enclosure

For a series circuit the current flowing is

same in all components

What is the primary advantage of FM over AM

noise immunity

Floor receptacle outlets are not counted unless they are within a distance of ___mm from the wall

450

a permanent split single phase capacitor motor does not have

centrifugal switch

the sparking at the brushes of a dc generator is due to

reactance voltage

buchholz relay is a

gas activated device

electrical continuity is required by the Philippine electrical code for metallic conduit

to assure equipment grounding

Which is not included in a basic communication circuit

antenna

Where must the surge arrester be placed

near transformer

What affects the speed of a rotating field

frequency and no. of poles

___ is the overall energy program formulated and updated yearly by the DOE submitted to congress pursuant to RA 75387

Energy Plan

In a resistance welding the SCR is closed during ____ time

weld

In transmission, picture signal is ____modulated

amplitude

What is the device function number of directional power relay

with reduction of load on alternator

the frequency increases

Transformer taps are generally on the ___ of the tranformer

high voltage winding

100

a thermal protection switch is able to protect a circuit against

overload

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