EE Terms Additional

Hazel Lynn Ramos · 95問 · 2年前

通報

問題一覧

In a given circuit when 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

In series rl circuit the inductor current ___ the resistor current

is equal to

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

This type of emf induced by neighboring coils

mutually induced

Transformers are used to change the value of the following except

power

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

becomes maximum

A four way switch control a lamp from __ different locations

When a V-V system is converted into ∆-∆ system, increase in the capacity of the system is ____ percent

73.2

Converts energy of water to mechanical energy

turbine

the applied voltage in a transformer is increased by 50% and frequency is reduced by 50%. the maximum core flux density will become

3 times

A device that establishes an electrical connection to the earth

grounding electrode

Which of the following is not a standard branch circuit ampere rating

25 A

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

to an external battery

Power in balanced three phase system is measured by two wattmeter method and it is found that the ratio of the two wattmeter readings is 2 is to 1.

0.866

A diversity factor of two gives a saving of __ percent in generating equipment

In a parallel rc circuit as the capacitance decreases the power factor

increases

Which of the following is the basis for standards of electrical wiring installations in the philippines

philippine electrical code

In dwelling units with the hallway of 3 m or more in length at least how many receptacle outlet should be installed

When the length of a wire is doubled and all other factor remain the same what would the wire resistance become?

doubled

An act to ensure and accelerate the total electrification of the Philippines also known as the EPIRA law of 2001

RA 9136

Sparking occurs when a load is switched off because the circuit has high

inductance

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

they produce less arcing

Power develop by a dc motor is maximum when the ratio of back emf and applied voltage is

half

The starting winding of single phase motor is placed in

stator

In a synchronous motor the rotor copper losses are met by

dc source

A substance that contains atoms with several bonds of electrons but with only one valence electrode is

conductor

If the capacitance in a series rlc ac circuit increases by a factor of 4, what happens to the resonant frequency

it decreases by 50%

When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

statically induced emf

A coulomb

is an extremely large number of charge carriers

Fault level means

fault MVA

Which plant can never have 100% load factor

peak

A potentially lethal electric current is on the order of

0.1 A

The unit of elastance is

daraf

All magnetic fields originate from

moving electric charges

An ion

can have either a positive or negative charge

An induction motor is analogous to

to winding transformer with short circuit secondary

A material best suited for manufacturing of fuse wire is

silver

In the flemings left hand rule thumb always represent

direction of force on conductor

The ampere hour capacity of battery depends on

the area of the plates

For a three phase unbalanced load

the power factor of each phase may be different

Overhead lines are protected from lighting by the use of I. Overhead ground conductors II. Surge arrester

either I or II

The synchroscope is an instrument used to indicate the

phase relationship between two voltages

The armature current drawn by any dc motor is proportional to

the torque required

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

kva will be lagging

In electroplating the positive electrode is called the

anode

Barrier potential of silicone diode is

0.7 volts

Which of the following is an active element of a circuit

ideal current source

Which waveform will have the minimum rms value if they have the same peak value of voltage

triangular wave

The minimum armature current of a synchronous motor corresponds to operation at

unity pf

Lap winding is best suited for ____ voltage, ____ current dc generators

low, high

Wave winding is best suited for _____ voltage, _____ current dc generators

high, low

What is the relative permittivity of vacuum

unity

On tripling the number of turns of a coil the inductance

becomes nine times as large

An external resistance is added in series with the field of a dc shunt motor. When the motor runs, the effect of resistance is

to increase the speed of the motor

Which of the following is not the method of arc dispersion

use of rectifiers

During load shedding

some loads are switched off

The capacitor in a series rc circuit at steady state is

open circuit

The ratio of lumen reaching the work plane divided by the total lumens generated by the lights is

coefficient of utilization

When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected, then

the motor stops

Sensitivity of a voltmeter is expressed as

ohms/volt

What is the maximum distance between two receptacles in a single family dwelling unit

1.8 m

The value of mutual inductance in terms of self inductance of the two coils L1 and L2 is proportional to

√L1L2

Which of the following relays is used in transformers

Buchholz relay

The heat required to raise 1 g of water at 1° c is

calorie

Heating value of coal largely depends on

ash content

For open circuited condition of Thevenins theorem all sources of emf in the network are replaced by

their internal impedance

Heating effect of current has an undesirable side effect in

vacuum cleaner

The phase angle for a series rc circuit may be computed as the angle between the ____ and ____ phasors.

resistance, impedance

The impedance triangle is similar to the ___ triangle with the resistance phasor in place of the ___.

voltage, resistor voltage

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

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 consists of

an airlight metal drum fix at the top of the tank

Cellular phones operate in the frequency range of

UHF

Varmeter when paired with other device 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

Which of the most reliable power plant

steam

If an electrical network having one or more than one voltage source is transformed into equivalent electrical network with a single voltage source (which is short circuit current of previous circuit) with parallel internal resistance of the network with all current source replaced by their internal resistance. The above illustration is called

norton's theorem

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

philippine electrical code

In a diode modulator, what supplies the negative half wave

tuned circuit

Which is not a source of power

thermocouple

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.

The velocity of electromagnetic waves in free space is given by

1/√UE

Induced charge on insulator

resides on surface

Human body is

conductor

The presence of earth in case of overhead lines

increase the capacitance

Transformer breaths in when

load on it decreases

The shaft of synchronous motor is made of

mild steel

Bundle conductors are used in transmission lines the effective capacitance in inductance with 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

In a parallel circuit the potential difference across the resistance

always constant

The resistance phasor for a series rc circuit points to the right. The capacitance reactance phasor points ___ while the diagonal of the rectangle having these two phasors as sides represents the ___

down, reactance

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

differential

100

Transformer a is in parallel with transformer b. If the equivalent impedance of the transformer b is greater than a then

kva share of transformer a is greater than that of b

Math

Math

95問 • 2年前

ESAS Lesson Objectives 1

ESAS Lesson Objectives 1

ESAS Lesson Objectives 2

ESAS Lesson Objectives 2

ESAS Lesson Objectives 3

ESAS Lesson Objectives 3

Other Terms for ESAS

Other Terms for ESAS

Hazel Lynn Ramos · 99問 · 2年前

ESAS Matlab

ESAS Matlab

99問 • 2年前

ESAS 200 objectives 1

ESAS 200 objectives 1

ESAS 200 objectives 2

ESAS 200 objectives 2

ESAS 350 objectives 1

ESAS 350 objectives 1

ESAS 350 objectives 2

ESAS 350 objectives 2

Hazel Lynn Ramos · 44問 · 2年前

ESAS 350 objectives 3

ESAS 350 objectives 3

44問 • 2年前

EE Lesson Objectives 1

EE Lesson Objectives 1

EE Lesson Objectives 2

EE Lesson Objectives 2

EE Lesson Objectives 3

EE Lesson Objectives 3