EE Lesson Objectives 1

Hazel Lynn Ramos · 95問 · 2年前

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Interpoles are normally connected in

parallel with the field

If a speed of a dc shunt motor increases, the back emf

increases

The current flowing in the conductors of a dc motor is?

what opposes change in current

inductor

what opposes change in voltage

capacitor

the magnetic potential in a magnetic circuit can be measured in terms of

MMF

the tesla is a unit of

magnetic flux density

what is the counterpart of magnetic flux in an electric circuit

current

whenever a conductor cuts magnetic flux, an emf is induced in that conductor. this statement is due to

faraday's law

the law that induces emf and current always opposes the cause producing them was discovered by

lenz

in the left hand rule, thumb always represents

direction of force on conductor

which of the following is not a property of magnetic field lines

the lines cross themselves only at right angles

positive charge is distributed uniformly throughout a non-conducting sphere. the highest electric potential occurs

at the center

absolute permittivity of vacuum is taken as

8.854 * 10 ^ -12 farad/meter

the coulomb force F acts on two charges a distance r apart. what is F proportional to

1/r²

current has units of

coulomb/second

a parallel plate capacitor with plates of area A that are separated a distance d by air is initially charged with charge q. the energy stored in the capacitor initially is E. the plates are then separated by 2d. what is the new energy stored in the capacitor

a voltmeter consists of a meter movement in series with

high resistance

what extends the range of a dc ammeter

shunt resistance

which of the following characteristics of the plates of the battery will the ampere-hour of the battery depends on

area

transient current in the circuit results from

changes in the stored energy in inductors and capacitors

current that continually reverses its direction

alternating current

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

chemical effects

when a sole purpose of ac is to produce heat the selection of conductor is based on ___ value of the current

RMS

root mean square is also called the ___ voltage

effective

the value of form factor for a pure sine wave is

1.11

the value of peak factor for a pure sine wave is

1.414

the net reactance in a series RLC circuit is

xl-xc

for an RL circuit the power factor cannot be less than ___ and greater than ___

0,1

when the voltage remains the same, the current will ___ as the impedance decreases I. decrease II. increase

II only

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

decreases

which of the following ac device is used to measure the angle between the voltage and its current

phase angle meter

when the current and voltage are out of phase by 90°, the power is

zero

a coil of wire having a value of 10 + j16 ohms is connected in series with a capacitive reactance xc, and this series combination is then connected in parallel with a resistor R. if the equivalent impedance of the circuit is 8 + j0 ohms, what is the value of xc in ohms?

the power factor of an inductive circuit can be best improved by connecting a capacitor to it in

parallel

the value of an alternating quantity at any instant

instantaneous value

the maximum value attained by an alternating quantity during positive or negative half cycle. also called the peak value or the amplitude of an alternating quantity.

maximum value

the average of all instantaneous of half cycle of an alternating quantity.

average value

the value of an alternating quantity which when applied to a given circuit for a given time produces the same expenditure of energy as when DC is applied to the same circuit for the same interval of time.

effective value

the graph between an alternating quantity (voltage or current) and time

waveform

the maximum value either positive or negative which an alternating quantity attains during one complete cycle. also called peak value or maximum value

amplitude

a complete change in value and direction of an alternating quantity.

cycle

the number of cycles per second

frequency

the length of one complete wave or the distance travelled by the wave in one cycle

wavelength

the opposition of current flow which dissipates power and turns it mostly into heat

resistance

it is a form of opposition that electronic components exhibit to flow of alternating current due to inductance or capacitance

reactance

is a total opposition to the flow of current resulting from the circuits combination of resistance and reactance

impedance

is the total useful power delivered in the actual power dissipated by the load

real power

is a measure of the energy exchange between the source and the reactive part of the load

reactive power

is the measure of the total active and reactive power of a system. it is also called complex power

apparent power

is defined as the ratio of the real power absorbed by the load to the total apparent power in the circuit

power factor

is the angle between the real power and the apparent power

power factor angle

is defined as the ratio of the reactive power to the total apparent power

reactive factor

ohm's law is not applicable to non-linear and non-ohmic circuits such as

semiconductors vacuum tube diodes filament bulbs thermistors insulators

is the property of a material that resists or opposes the flow of current

resistance

is the rate of doing work the rate at which work is performed or done

power

is the force that acts upon an object to cause a displacement

work

is a force or property that can cause two objects to attract or repel each other due to the motion of electric charges

magnetism

is a force that sets up or tends to set up magnetic flux in a magnetic circuit by passing an electric current through a number of turns of a wire

magnetomotive force

the number of magnetic lines of force in a magnetic field

magnetic flux

is the property of material that opposes flux flow

reluctance

the ability of material to conduct magnetic flux through it

permeability

branch of physics that deals with the study of electromagnetic force and deals with electricity and magnetism in the interaction between them

electromagnetism

is the production of EMF across an electrical conductor in a changing magnetic field or generating electric current with a magnetic field

electromagnetic induction

is a tendency of a conductor to oppose a change in current flowing through it measured in the unit of Henry

inductance

is a passive electronic component in a circuit that stores energy in the magnetic field

inductor

formerly known as condenser, is a passive element designed to store energy in its electric field

capacitor

is the ratio of the charge on one plate of a capacitor to the voltage difference between the two plates measured in Farads

capacitance

in a series RLC circuit the current at resonance is

maximum

in a series RLC circuit the impedance at resonance is

minimum

the current flowing in L and C at parallel resonance are

equal

the condition in ohm's law is that

the temperature should remain constant

the curve representing ohm's law is

linear

the resistance of a rod does not depend on

the shape of cross-sectional area

the specific resistance depends upon

the nature of the material of the conductor only

when electrons build up pressure at one point, it is called

current flow

always made of the same material have the same length but different diameters. they are connected in series to a battery. Which of the following quantity is the same for the two wires

current

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

power in a three-phase delta system with balanced load is equal to

√3 x VL x IL x power factor

for an unbalanced load which connection is suitable?

4-wire wye connection

circuit breakers are rated based on their ___ fault.

symmetrical

in two-wattmeter method, the reading of one of the what metres will be zero when

power factor is 0.5

the readings of the wattmeter will be same in the two-wattmeter method when ___

power factor is unity

a copper wire is drawn down such that it's length is doubled but the volume remains the same, what is the new resistance of the wire?

4R1

Which statement is true

magnetic flux lines does not have sources and sinks

in a DC steady state, a capacitor behaves like a/an ____, while an inductor behaves like a/an ____. I. short II. open III. grounded

II and I

Tesla is the unit of

magnetic induction

the resistance of resistor 1 is twice of resistor 2. network connected in series and the potential difference is maintain across the combination. what is the rate of thermal energy generation in the resistor 1

twice that in resistor 2

when the amplitude of the oscillator in a series RLC circuit is doubled, the ___.

current amplitude is doubled

which of the following protective device operates on the principle of Kirchoff's current law

differential protective relay

the magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is ____

maximum when the plane of the loop is parallel to B

a resistor with resistance R1 and a resistor with resistance are two are connected in parallel to an ideal battery with EMF. what is the rate of thermal energy generation in the resistor with resistance R1?

V2/R1

in a purely resistive AC circuit, the current

is in phase with the EMF

when the current and voltage are out of phase by 90°, the power is

zero

the power factor of incandescent bulb is

unity

the impedance triangle is similar to the ___ triangle with the resistance spacer in place of the ____

voltage, resistor voltage

the units of motional EMF are

Tesla•meter²/second

ohm's law is not applicable to

semiconductors

the study of illumination involves

design of lighting system

100

two wires made of the same material have the same lengths but different diameters. they are connected in parallel to a battery. the quantity that is not the same for the wires is

the current

Math

Math

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