ELECTRICAL 3

Gaviola Jayson, Alab · 100問 · 2年前

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Which is not a standard distribution voltage in the Philippines

69 kV

What is the maximum number of conductors in a raceway that does not need to be derated

When peace and order problem exist, National Grid Corportation of the Philippines (NGCP) issues

security alert

Which increases the resistance of a conductor

increase in length

Red, red, orange, silver indicates a resistance of

22 k, ±10%

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

Half duplex

21 is the device function number for this relay

Distance relay

AC system has the following disadvantages over DC system

charging current exists

RA 7832 concerns on

pilferage of electricity, theft of transmission material and rationalizing of system loss

Open circuit test on transformers is conducted to determine

core loss

PDC in EPIRA means

Philippine Distribution Code

What device is used to measure the temperature of a motor winding while the motor is in operation

Resistance temperature detector

Which of the following type of fault used only the equivalent positive sequence impedance of the circuit in the short circuit calculation

Three phase fault

The amount of frequency deviation from the carrier center of frequency in an FM transmitter is proportional to the

amplitude

If the resistance in a series RC circuit is increased, the magnitude of the phase angle

decreases

Nuclear reactors generally employ

fission

Which of the following is not a factor in calculating the feeder conductor size

branch circuit protection

Between no-load and full load, _________ motor develops the least torque

shunt

One KW is equal to ______ gram-cal/sec

238.8

Voltage resonance means

series resonance

A barrier voltage at a PN junction for germanium is about

0.3 v

This is the device function number for DC power circuit breaker

A diversity factor of 1.5 gives a saving of ___% in generating equipment

In case the field of a synchronous motor is underexcited, the power factor will be

lagging

If stator voltage of a SCIM is reduced by 25 percent of its rated voltage, torque developed is reduced by ______ percent of its full load value

A shorted resistor has

zero voltage across it

Materials whose permeabilities are slightly greater than that of free space are called

paramagnetic

A real current source has

a large internal resistance

One ampere turns is equal to

1.26 Giberts

Three phase alternators are invariably Y-connected because

higher terminal voltage is obtained

The essential condition for stable parallel operation of two dc generators having similar characteristics is that they should have

drooping voltage characteristics

Large current in dc circuits are almost always measured with a/an

milivoltmeter and shunt

The voltage induced in a loop of wire rotating in a strong and steady magnetic field is

Which of the following insulators is most affected by heat

PVC

What effect of principle those of a microphone operates

Piezoelectric

Fixtures that transmit 60% to 90% of the light downward are classified as

Semidirect

Which of the following is a primary disadvantages of FM over AM

Excessive use of spectrum space

The size of conductor on EHV lines is obtained based on

corona

Which of the following is NOT a property of magnetic field lines

The lines cross themselves only at right angles

Which of the following effects are generally less for an alternating current than for a direct current

chemical effects

Which of the following cannot have a single unit of 100MW

Diesel power plant

In the left hand rule, thumb always represents direction of the

force on conductor

Copper loss of a transformer are determined by means of a/an ________

short circuit

What is/arebtye main reasons for using high voltages in the transmission of power in the grid system I - to transmit bulk power with minimum line losses II - Increase system reliability

I only

In which type of electronic communication does the information travel in two directions

Full duplex

Which of the following insulators will be selected for high voltage application

suspension type

The dc armature winding in which the coil sides are placed a pole pitch apart is called

Full pitch

The effect if series capacitor on a transmission line is to improve

Steady state stability

In two wattmeter method, the reading of one of the wattmeters will be zero when

power factor is 0.5

The electric motor generally used in household food mixer

Universal

What type of transformer bank is used to convert 2-phase to 3-phase power

scott-T

By increasing the transmission voltage double of its original value, the same power can be dispatched keeping the line loss

One fourth of original value

The highest speed attained by a dc shunt motor is

equal to no load speed at rated flux

How many parallel paths does a 6 pole triplex lap wound connected armature winding of a dc generator has

The average of dc voltage of a half wave rectifier circuit is _______ the value of the peak input voltage

31.8%

Chemical with lower flash points present a greater

flammability hazard

The product of rms values of current and voltage is called as

apparent power

An electric current can neither be _______________ nor ________________

seen, touched

Ohm's law is not applicable to

vacuum tubes

Which medium has the highest value of dielectric strength

mica

Which of the following buses constitute the maximum number in a power system

P Q bus

In order to transfer the load from one alternator to another alternator, when they are operating in parallel

prime mover power input is increased

KLC works on the principle of which of the following

law of conservation of charge

Sumpner's test is conducted on transformers to determine

temperature

In a transformer, the resistance between the primary and secondary must be

Infinite

The d.c generator used for voltage boost is

series

What is the main drawback in NR method

A large memory allocation is required to store the jacobian matrix

If a permanent brake magnet is moved away from the spindle of the moving disc, energy meter

will run slow

Buchholz relay in a transformer is placed in between

the tank and the conservator

According to Philippine Distribution Code (PDC), undervoltage is a long duration voltage where the RMS value of the voltage is less than or equal ______ of the nominal voltage

90%

The cost of power generatioj will decrease the load factor

increases

At a voltage controlled bus, following quantities are specified

P and |V|

In an AC circuit, the ratio of kW/ kVa represents

power factor

Protection scheme used for detection of loss of excitation of a very large generating feeding into a grid employs

offset mho relays

The unit of intensity is

newtons/coulomb

in TV transmission, picture signal is _________ modulated

amplitude

A permanent split phase capacitor motor does not have

centrifugal switch

The maximum value of potential gradient in a cable occurs in

conductor

What does PEMC in EPIRA stands for

Philippine Electricity Market Corportation

The rotor of an induction motor gets its power from

magnetic induction

When maximum and average load are equal, the load factor will be

1.0

For alteration, having fractional pitch of 5/6 the coil span

150°

in the transformers

high tension winding is used near the core

Which of the following parameters can be neglected for a short line

capacitance

Find the frequency of radiowave whose wavelength is 600m

500 kHz

The curve representing Ohm's law is

linear

The overcurrent protective device is caused to operate by

current flow

What is the maximum number of bends permitted in rigid conduits between outlets

4 quarter bends

Which of the following insulators will be selected for high voltage application

suspension type

If the torque angle continuosly increases, system will become

unstable

The condition in Ohm's law is that

the temperature should remain constant

Which of the following shall be included in the calculation of the reliability standards indices of the distributor asset by the Philippine Distribution Code

Outages that occur on the primary lines of the distribution system

Base load plants are designed to supply power at

high capital cost and low operating cost

Peak load plants are designed to supply power at

Low capital cost and high operating cost

If the effect of earth is taken into account, then the capacitance of line to ground

increases

The effective resistance of conductor is increased by

both skin effect and corona effect

Surge impedance of transmission line is given by

√L/C

A terminal pair of network of a transmission line can be represented by a

either π network or T-network

In television system, channels 2 and 13 are classified as

VHF

100

Which of the following methods of generating electric power from the sea water is more advantageous

tidal power

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