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100問 • 2年前

問題一覧

The electric motor generally used in household food mixer.

Universal

The power circuit for bathroom can also supply: i. one luminaire and one receptacle for the same bathroom ii. Two receptacle for the same bathroom and two or more for another bathroom iii. Two receptacle and two luminaire for the same bathroom and two more receptacle and luminaire for another bathroom.

I only

One primary and one secondary terminal of two-winding cransformer as connected to an ohm-meter Instrument What will be the reading the instrument?

Infinity

A car battery is rated at 100 ampere-hour. An ampere-hour is a unit of

Charge

The boundary of the protection system is determined by the location of

Current Transformer

GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the grid to the PGC. What is the GMC stands for?

Grid Management Committee

Which of the following protective relay/s operates on the principle of the Kirchoff's Current Law?

Differential Relay

A permeable substance is one

Through which magnetic lines of force can pass very easily

Which of the following has the greatest effect in decreasing the oscillation frequency of an LC circuit? Using instead

2L and 2C

The costumer is only charged or credited, as the case may be for the difference between the electricity supplied by the Distribution Utility and electricity it supplies to Distribution Utility when the times it has excess VRE generation both of which are metered using either 2 unidirectional meters, one for import and one for export, or a single unidirectional meter. what do you called this scheme?

Net Metering

Which of the following statement is correct concerning electric field?

Electric field are closed together where the field is large.

Which of the following in the eddy current is not proportional to?

square of the load current of the laminated core

Ohms Law does not apply to

Semi-conductor

All grounding connections are made ____ and electrically _____

Permanent , Continuous

Why is the core losses are negligible during a short-circuit test conducced on transformer?

Mutual flux is small

Which of the following is the electrical device that is usually required to installed in moisture area in the dwelling unit in order protect the person from electric shock?

Ground Fault Circuit Interrupter

Which of the following instrument is used to measure high resistance as the measurement of insulation resistance?

Megger

Which of the following is the correct statement about coulomb?

The amount of current of charge that flows past a point in one second when the current is one ampere.

What is the effects on current flow in reversing the direction movement as a concuctor in a magnetic field of a generator?

Reverse the direction of the current flow

A motor generally used for toys

Shaded pole

Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs

at the center

The rms valve of an ac current is:

that steady current that produces the same rate of heating in a resistor as the actual current

Amplitude modulation generated at a very low voltage or Power amplifier is ____ modulation.

low-level

If the magnetic flux through a certain region is changing with time

an emf must exist around the boundary

The current is zero in a conductor when NO potential difference is applied because

for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction

Which of the following will the effect of the electric shock in the human body depend on?

the current flowing in the body

Modern locomotives are powered by DC motors driven by DC generators. Those are, in furn, driven by diesel engines. Which of the following is the reason for using such a configuration instead of AC generator-motor sets?

The DC configuration provides high torque and good incremental power at low speeds, and performs equally well at high speeds.

Which of the following is NOT a reason why single-phase induction motor run?

Hysteresis

What is the function of the surge tank in the hydropower plant?

Relieve water hammer pressures in the penstock pipe

In an oscillating LC circuit, the total stored energy is U. The maximum energy stored in the capacitor during one cycle is

Which of the following is/are the MOST important factor/s to be considered in the selection of fuel for power plants? I. Cost of fuel Il. Calorific valve of fuel

Both I and II

The government agency created under Presidential Decree 269, whose additional mandates includes preparing electric cooperatives in operating and competing under a deregulated electricity market.

National Electrification Administration

Which statement about a charge placed on a dielectric material is true?

The charge is confined to the region in which the charge was placed.

In a DC motor, what is the definition of "field resistance"?

It is the resistance of the excitation circuit.

A device used to detect the impurities in insulating oil.

Oil Tester

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

steady state stability

_____ is used to prevent motorizing of the generator.

Reverse Power Relay

Gauss-Seidel iterative method can be used for solving a set of

linear algebraic equations only

According to ERC, the agreement between the User and the Distribution Utility which specifies the terms and conditions pertaining to the connection of the User System or Equipment to a new Connection Point in the Distribution System.

Connection Agreement

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

security red alert

RA 7832 concerns on __________

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

Nuclear reactors generally employ

fission

The strain type insulators are used when I. Transmission line is dead ended Il. The direction of the transmission line changes

Either I or II

If the height of the transmission tower is decreased, the capacitance of the line

Increases

In Philippine Distribution Code, retail competition and open access on distribution wires shall be implemented not later than three (3) years upon the effectivity of the Act, subject to the following conditions, which is not included?

Non-privatization of at least 70 percent of the total capacity of generating assets of NPC Luzon and Visayas

In television system, channels 2 and 13 are classified as

VHF

For two alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is

to be kept constant but input torque should be increased

To adjust the power of the alternator, adjust the

Governor

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 and negative sequence impedance of the circuit in the short-circuit calculation?

Line to Line

Zero-sequence current will flow in a fransmission line when there is

double line to ground

Which of the following characteristie of the plates of the battery will the Ampere-Hour of the battery depends on?

Area

Which of the following statements is correct for resistance?

The resistance of conductor is the hindrance by which the conductor opposes the flow of the current.

Which of the following is frue?

Magnetic flux lines have neither source nor sink

Which is not a characteristie of an ideal transformer?

Finite permeability

What is the IEEE device function number 50?

Instantaneous overcurrent relay

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

Load Shredding

A distributor is designed from the point of view of

Voltage Drop

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

Phillippine Grid Code

A conductor is distinguished from an insulator with the same number of atoms by the number of

Nearly free electrons

Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:

at none of these places (there is no place)

A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:

The author made a mistake

The electric field due to a uniform distribution of charge on a spherical shell is zero:

only inside the shell

"Positive charge +Q is uniformly distributed on the upper half a semicireular rod and negative charge Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, the center of the semi circle (to the right of the rod)

Downward

An electron traveling north enters a region where the electric field is uniform and points north. The electron:

slows down

Choose the INCORRECT statement:

According to Gauss' law, if a closed surface encloses no charge, then the electric field must vanish everywhere on the surface

An electron volt is :

the energy gained by an electron in moving through a potential difference of 9 volt

A hollow metal sphere is charged to a potential V. The potential at its center is:

The equipotential surfaces associated with a charged point particles are:

concentric spheres centered at the particle

If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is:

unchanged

If the plate area of an isolated charged parallel-plate capacitor is doubled:

The potential difference is doubled

Pulling the plates of an isolated charged capacitor apart

increases the potential difference

A dielectric slab is slowly inserted between the plates of a parallel plate capacitor, while the potential difference between the plates is held constant by a battery. As it is being inserted.

the capacitance and the charge on the positive plate increase but the potential difference between the plates remains the same

Current is a measure of;

amount of charge that moves past a point per unit time

Positive charge Q is uniformly distributed on a semicircular rod. What is the direction of the electrie field at point P, the center of the semicircle (to the right of the rod?

to the right

An electric field exerts a torque on a dipole only if:

the field is not parallel to the dipole moment

An electron is accelerated from rest through a potential difierence V. Its final speed is profortional to:

sqrt V

A conducting sphere with radius R is charged until the magnitude of the electric field just outside its surface is E. The electric potential of the sphere, relative to the potential far away, is:

Equipotential surfaces associated with an electric dipole are:

None of these

Let Q denote charge, V denote potential difference, and U denote stored energy. Of these quantities, capacitors in series must have the same:

Q only

Let & denote charge, V denote potential differenee, and U denote stored energy. Of these quantities, capacitors in parallel must have the same:

V only

Two wires made of different materials have the same uniform current density. They carry the same current only if:

their cross-sectional areas are the same

Two wires made of different materials have the same uniform current density. They carry the same current only if:

their cross-sectional areas are the same

In a conductor carrying a current we expect the electron drift speed to be:

much less than the average electron speed

Of the following, the copper conductor that has the least resistance is:

thick, short and cool

The resistanee of a rod does NOT depend on:

the shape of its (fixed) cross-sectional area

Two wires are made of the same material and have the same length but different radii. They are joined end-to-end and a potential difference is maintained across the combination. Of the following the quantity that is the same for both wires is:

current

For an ohmic substance the resistivity is the profortionality constant for:

current density and electric field

For an ohmic resistor, resistance is the proportionality constant for:

current and potential difference

You wish to triple the rate of energy dissipation in a heating device. To do this you could triple:

the resistance keeping the current the same

"You buy a "75W" light bulb. The label means that:

none of these

The sum of the currents into a junction equals the sum of the currents out of the junction" is a consequence of

conservation of charge

The sum of the emf's and potential differences around a closed loop equals zero" is a consequence of;

conservation of energy

The emf of a battery is equal to its terminal potential difference:

only when there is no current in the battery

At any point the magnetic field lines are in the direction of:

None of these

The magnetic force on a charged particle is in the direction of its velocity if

Never

A magnetic field CANNOT:

change the kinetic energy of a charged particle

A beam of electrons is sent horizontally down the axis of a tube to strike a florescent screen at the end of the tube. On the way, the electrons encounter a magnetic field directed vertically downward. The spot on the sereen will therefore be deflected

to the right as seen from the electron source

At one instant an electron is moving in the positive & direction along the r axis in a region where there is a uniform magnetie field in the positive z direction. When viewed from a point on the positive z axis, it subsequent motion is:

counterclockwise around a circle in the y plane

100

J. J. Thomson's experiment, involving the motion of an electron beam in mutually perpendicular E and B fields, gave the value of:

charge/mass ratio for electrons

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問題一覧

The electric motor generally used in household food mixer.

Universal

I only

One primary and one secondary terminal of two-winding cransformer as connected to an ohm-meter Instrument What will be the reading the instrument?

Infinity

A car battery is rated at 100 ampere-hour. An ampere-hour is a unit of

Charge

The boundary of the protection system is determined by the location of

Current Transformer

GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the grid to the PGC. What is the GMC stands for?

Grid Management Committee

Which of the following protective relay/s operates on the principle of the Kirchoff's Current Law?

Differential Relay

A permeable substance is one

Through which magnetic lines of force can pass very easily

Which of the following has the greatest effect in decreasing the oscillation frequency of an LC circuit? Using instead

2L and 2C

Net Metering

Which of the following statement is correct concerning electric field?

Electric field are closed together where the field is large.

Which of the following in the eddy current is not proportional to?

square of the load current of the laminated core

Ohms Law does not apply to

Semi-conductor

All grounding connections are made ____ and electrically _____

Permanent , Continuous

Why is the core losses are negligible during a short-circuit test conducced on transformer?

Mutual flux is small

Which of the following is the electrical device that is usually required to installed in moisture area in the dwelling unit in order protect the person from electric shock?

Ground Fault Circuit Interrupter

Which of the following instrument is used to measure high resistance as the measurement of insulation resistance?

Megger

Which of the following is the correct statement about coulomb?

The amount of current of charge that flows past a point in one second when the current is one ampere.

What is the effects on current flow in reversing the direction movement as a concuctor in a magnetic field of a generator?

Reverse the direction of the current flow

A motor generally used for toys

Shaded pole

Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs

at the center

The rms valve of an ac current is:

that steady current that produces the same rate of heating in a resistor as the actual current

Amplitude modulation generated at a very low voltage or Power amplifier is ____ modulation.

low-level

If the magnetic flux through a certain region is changing with time

an emf must exist around the boundary

The current is zero in a conductor when NO potential difference is applied because

for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction

Which of the following will the effect of the electric shock in the human body depend on?

the current flowing in the body

The DC configuration provides high torque and good incremental power at low speeds, and performs equally well at high speeds.

Which of the following is NOT a reason why single-phase induction motor run?

Hysteresis

What is the function of the surge tank in the hydropower plant?

Relieve water hammer pressures in the penstock pipe

In an oscillating LC circuit, the total stored energy is U. The maximum energy stored in the capacitor during one cycle is

Which of the following is/are the MOST important factor/s to be considered in the selection of fuel for power plants? I. Cost of fuel Il. Calorific valve of fuel

Both I and II

The government agency created under Presidential Decree 269, whose additional mandates includes preparing electric cooperatives in operating and competing under a deregulated electricity market.

National Electrification Administration

Which statement about a charge placed on a dielectric material is true?

The charge is confined to the region in which the charge was placed.

In a DC motor, what is the definition of "field resistance"?

It is the resistance of the excitation circuit.

A device used to detect the impurities in insulating oil.

Oil Tester

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

steady state stability

_____ is used to prevent motorizing of the generator.

Reverse Power Relay

Gauss-Seidel iterative method can be used for solving a set of

linear algebraic equations only

Connection Agreement

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

security red alert

RA 7832 concerns on __________

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

Nuclear reactors generally employ

fission

The strain type insulators are used when I. Transmission line is dead ended Il. The direction of the transmission line changes

Either I or II

If the height of the transmission tower is decreased, the capacitance of the line

Increases

Non-privatization of at least 70 percent of the total capacity of generating assets of NPC Luzon and Visayas

In television system, channels 2 and 13 are classified as

VHF

For two alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is

to be kept constant but input torque should be increased

To adjust the power of the alternator, adjust the

Governor

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 and negative sequence impedance of the circuit in the short-circuit calculation?

Line to Line

Zero-sequence current will flow in a fransmission line when there is

double line to ground

Which of the following characteristie of the plates of the battery will the Ampere-Hour of the battery depends on?

Area

Which of the following statements is correct for resistance?

The resistance of conductor is the hindrance by which the conductor opposes the flow of the current.

Which of the following is frue?

Magnetic flux lines have neither source nor sink

Which is not a characteristie of an ideal transformer?

Finite permeability

What is the IEEE device function number 50?

Instantaneous overcurrent relay

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

Load Shredding

A distributor is designed from the point of view of

Voltage Drop

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

Phillippine Grid Code

A conductor is distinguished from an insulator with the same number of atoms by the number of

Nearly free electrons

Two particles have charges Q and -Q (equal magnitude and opposite sign). For a net force of zero to be exerted on a third charge it must be placed:

at none of these places (there is no place)

A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:

The author made a mistake

The electric field due to a uniform distribution of charge on a spherical shell is zero:

only inside the shell

Downward

An electron traveling north enters a region where the electric field is uniform and points north. The electron:

slows down

Choose the INCORRECT statement:

According to Gauss' law, if a closed surface encloses no charge, then the electric field must vanish everywhere on the surface

An electron volt is :

the energy gained by an electron in moving through a potential difference of 9 volt

A hollow metal sphere is charged to a potential V. The potential at its center is:

The equipotential surfaces associated with a charged point particles are:

concentric spheres centered at the particle

If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is:

unchanged

If the plate area of an isolated charged parallel-plate capacitor is doubled:

The potential difference is doubled

Pulling the plates of an isolated charged capacitor apart

increases the potential difference

A dielectric slab is slowly inserted between the plates of a parallel plate capacitor, while the potential difference between the plates is held constant by a battery. As it is being inserted.

the capacitance and the charge on the positive plate increase but the potential difference between the plates remains the same

Current is a measure of;

amount of charge that moves past a point per unit time

Positive charge Q is uniformly distributed on a semicircular rod. What is the direction of the electrie field at point P, the center of the semicircle (to the right of the rod?

to the right

An electric field exerts a torque on a dipole only if:

the field is not parallel to the dipole moment

An electron is accelerated from rest through a potential difierence V. Its final speed is profortional to:

sqrt V

A conducting sphere with radius R is charged until the magnitude of the electric field just outside its surface is E. The electric potential of the sphere, relative to the potential far away, is:

Equipotential surfaces associated with an electric dipole are:

None of these

Let Q denote charge, V denote potential difference, and U denote stored energy. Of these quantities, capacitors in series must have the same:

Q only

Let & denote charge, V denote potential differenee, and U denote stored energy. Of these quantities, capacitors in parallel must have the same:

V only

Two wires made of different materials have the same uniform current density. They carry the same current only if:

their cross-sectional areas are the same

Two wires made of different materials have the same uniform current density. They carry the same current only if:

their cross-sectional areas are the same

In a conductor carrying a current we expect the electron drift speed to be:

much less than the average electron speed

Of the following, the copper conductor that has the least resistance is:

thick, short and cool

The resistanee of a rod does NOT depend on:

the shape of its (fixed) cross-sectional area

current

For an ohmic substance the resistivity is the profortionality constant for:

current density and electric field

For an ohmic resistor, resistance is the proportionality constant for:

current and potential difference

You wish to triple the rate of energy dissipation in a heating device. To do this you could triple:

the resistance keeping the current the same

"You buy a "75W" light bulb. The label means that:

none of these

The sum of the currents into a junction equals the sum of the currents out of the junction" is a consequence of

conservation of charge

The sum of the emf's and potential differences around a closed loop equals zero" is a consequence of;

conservation of energy

The emf of a battery is equal to its terminal potential difference:

only when there is no current in the battery

At any point the magnetic field lines are in the direction of:

None of these

The magnetic force on a charged particle is in the direction of its velocity if

Never

A magnetic field CANNOT:

change the kinetic energy of a charged particle

to the right as seen from the electron source

counterclockwise around a circle in the y plane

100

J. J. Thomson's experiment, involving the motion of an electron beam in mutually perpendicular E and B fields, gave the value of:

charge/mass ratio for electrons