ELECTRICAL 5

Gaviola Jayson, Alab · 100問 · 2年前

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The phase angle for a series RC circuit may be computed as the angle between the _______ and ________ phasors.

resistance, impedance

which is not a characteristics of an ideal transformer

finite permeability

It is defined as the total number of sustained customer power interruption within a given period divided by the total number of customers served within the same period

system average interruption frequency index

the specific resistance p is defined as

resistance of a conductor which has length of 1 m and cross section of 1m² at 20 C

What is the IIEE device function number 50

Instantaneous overcurrent relay

In long transmission line at no load the receiving end voltage as compared to the sending end voltage is

higher

What determines the direction of force in a conductor

left hand rule

which of the following plants will take least time in starting from cold conditions to full load operations

gas turbine

the study of illumination involves

design of lighting system

when a power plant is not able to meet the demand of consumers it will resort to

load shedding

a distributor is designed from the point of view of

voltage drop

conservator of a transformer consist of

an air -tight metal drum fixed at the top of the tank

cellular phones operate in the frequency range of

UHF

Varmeter when paired with other devices measures ____ factor

power

the type of ac distribution system commonly used to supply both light and power is the

three phase wye system with neutral wire

if an electrical network having one or more than one voltage source is transformed into equivalent electrical network with a single corn source which is the short circuit current of the previous circuit with the parallel internal resistance of the network with all current source replaced by their interior resistance the above solution is called

Norton's Theorem

Which is the most reliable power plant

steam

What governs the minimum safety requirement in the Philippines for distribution and grid

Philippine Electrical Code

In a diode modulator what supplies the negative halfwave

turned circuit

Which is not a source of power

thermocouple

when the frequency of a synchronous motor increases what happens to it's speed

increases

what instrument measures the insulation of a powerline

megger

At steady state in an RC circuit the capacitance will act as

open circuit

In an ac circuit a low value of KVAR compared with KW indicates

high power factor

Branch circuit larger than _____ amperes shall only supply non-lighting outlet load

Wye-delta starting is equivalent to auto transformer starting with___tapping

58%

With reference to armature windings wave windings are often called____windings

series

induced charge on insulators

resides on surface

human body is

conductor

the presence of earth in case of overheadlines

increases the capacitance

transformer breaths in when

load on it decreases

the shaft of synchronous motor is made of

mild steel

bundled conductors are used in transmission lines the effective capacitance and inductance will respectively

increase and decrease

in a three-phase system when the loads are perfectly balanced the neutral current is

zero

a double squirrel cage induction motor has

two parallel windings in rotor

the purpose of providing dummy coil in a generator is

to provide mechanical balance for the rotor

which of the following is not a full duplex

radar

in a circuit breaker the time duration from the instant of the fault to the extinction of arc is known as

total clearing time

34.5 kv to 69 kv is classified as

high voltage

for an rl circuit the power factor cannot be less than ___ or greater than ____

0,1

it is the overall energy program formulated and updated yearly by the doe submitted to the congress pursue one to ra 7638

philippine energy plan

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

the capacitors of powerfactor correction are rated in terms of

KVAR

in a balance three phase wye connected circuit the line voltage are equal

and so are the line currents

in a given circuit one power factor is unity the reactive power is

zero

joule found out that the heat produced in a current carrying conductor is proportional to the

square of the current

in a wye connected system line current is

equal to the phase current

what is the device function number of overcurrent relay

in a series rl circuit the inductor current ______ the resistor current

is equal to

a master control center for cellular telephone system is the

mobile telephone switching office

the permeability of a material means

the conductivity of a material for magnetic lines of force

is an instrument connected across the load

voltmeter

what will happen to the current of a transformer when the temperature of the transformer winding increases

decreases

the type of emf induced by neighboring coils

mutually induced

a coil of fire wound with or without a magnetic core design to have a higher self inductance than a straight wire

inductor

when a dc motor has no load what will happen to the back emf

becomes maximum

a four way switch controls a lamp from _____ different locations

when a v-v system is converted into delta delta system increase in the capacity of the system is _____percent

73.2

the current carrying capacity of a copper having twice the diameter of another copper wire is ____ as great

4 times

converts energy of water to mechanical energy

turbine

a device that establishes an electrical connection to the earth

grounding electrode

which of the following is not a standard branch circuit amperating

25 A

Once residual magnetism of a chant generator is lost it may be restored by connecting its shunt field

to an external battery

In parallel RC circuit as the capacitance decreases, the power factor

increases

the current flowing in the armature conductors of a dc motor is

heating effect of current has an undesirable side effect in

vacuum cleaner

1 kwhr is = _____ BTU

3413

if the resistance in a series RC circuit increased the magnitude of the phase angle

decreases

for an unbalanced load which connection is suitable

4 wire wye connection

Nuclear reactors generally employ

fission

in a parallel circuit the potential difference across the resistance

is always constant

what is the primary advantage of FM over AM

noise immunity

What is the IIEE device function number 21

distance relay

Which is not included in a basic communication circuit

antenna

when the sole purpose of an alternating current is to produce heat, the selection of conductor is based on ____ value of the current

root mean square

a type of electronics communication in which only one party transmits at a time

half duplex

two wattmeters can be used to measure 3 phase power for a

balanced and unbalanced load

Which of the following is not included in the evaluation of the technical performance of a distribution system according to PDC

collecting efficiency

the resistance phasor for a series rc circuit points to the right the capacitive reactance phasor points _____while the diagonal of the rectangle having these two phase source asides represents the ____

down, impedance

the phase angle for a series RC circuit may be computed s the angle between the ____ and ____ phasors

resistance impedance

what is the type of relay that is intended to respond to the difference between incoming and outgoing electrical quantities

differential

which is not a characteristics of an ideal transformer

finite permeability

what effect on current flow does reversing the direction of movement of a conductor in the magnetic field of a generator have

it reverses the direction of current flow

receptacle outlet in a dwelling unit must be installed no more than ____ mm above the floor

1700

the depletion region of a junction diode forms the ____ of the capacitor

dielectric

as specified by the erc a customer is said to be a large customer if ts demand is at least ____ MW

Which of the following can be used as lightning protection for distribution line

surge arrester and overhead ground conductor

silica gel prevents air moisture from entering the outdoor transformer tank it is placed in

breather

breather mounted on transformer tank contains

calcium

in an alternator the armature reaction influences the magnitude of

terminal voltage/phase

in dwelling units with a hallway of 3m or more in length at least how many receptacle outlet shall be installed

when installing two grounding electrodes the minimum distance between them

1800 mm

when the length of a wire is doubled and all other factors remained the same what would the wire resistance become

doubled

which of the following is not included in the evaluation of technical performance of a distribution system according to pdc

collecting efficiency

sparking occurs when a load switch off because the circuit has high

inductance

sleep rings are made of

copper

the primary reason for using carbon brushes over copper brushes in dc motors is

less arcing

power developed by dc motor is maximum when the ratio of back emf and applied voltage is

half

the starting winding of a single phase motor is placed in

stator

100

in a synchronous motor the rotor copper losses are met by

dc source

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