AC CIRCUITS

Question 1

it is form of electricity that flows in an alternating directions and/or possessing a voltage with alternating polarity over time.

Answer 1

-ALTERNATING CURRENT

Question 2

the shape of a graph of the varying quantity against time or distance is called

Answer 2

-WAVEFORM

Question 3

the standard ac waveform is the

Answer 3

-SINE WAVE

Question 4

is the number of cycles in one second.

Answer 4

-FREQUENCY

Question 5

the length of time is takes to complete one cycle. It is basically the reciprocal of the frequency.

Answer 5

-PERIOD

Question 6

is the distance between two points of similar cycles of a periodic wave.

Answer 6

-WAVELENGTH

Question 7

the value of the wave at its peaks.

Answer 7

-AMPLITUDE

Question 8

is the value of a sine wave at any instant of time or at any angle rotation. It is denoted by a lowercase letters v and i for voltage and current repectively.

Answer 8

-INSTANTANEOUS VALUE

Question 9

is the maximum value denoted by Vm or Vp for voltage and Im or Ip for current.

Answer 9

-PEAK VALUE

Question 10

is the arithmetic average of all the values in a sine wave for 1 half-cycle.

Answer 10

-AVERAGE VALUE

Question 11

value of an alternating sine wave is the value that gives the same heating effect as a steady direct current or voltage source.

Answer 11

-ROOT MEAN SQUARE

Question 12

rms is also considered as

Answer 12

-EFFECTIVE VALUE

Question 13

is the ratio of the rms value to the average value.

Answer 13

-FORM FACTOR

Question 14

is the ratio of peak value to the rms value.

Answer 14

-PEAK FACTOR

Question 15

phase is an angular measurement that specifies the position of a sine wave relative to a reference.

Answer 15

-AC PHASE RELATIONSHIP

Question 16

is defined as one waveform that is ahead of another in its zero crossing on the horizontal axis. Sine wave is shifted to left or reference by angle.

Answer 16

-LEADING WAVEFORM (PHASE SHIFT SINE WAVE)

Question 17

is one that is behind another. Sine wave shifted to the right of reference by an angle.

Answer 17

-LAGING WAVEFORM (PHASE SHIFT SINE WAVE)

Question 18

is a rotating arrow used to represent the time varying quantities in terms of their magnitude and angular measurements.

Answer 18

-PHASOR

Question 19

is the total opposition to ac current with the resistance and total reactance of the circuit combined.

Answer 19

-IMPEDANCE

Question 20

gives the angle between the total voltage and current in AC circuit.

Answer 20

-IMPEDANCE ANGLE

Question 21

is the opposition to ac current other than resistance due to inductance and/or capacitance in the circuit . It is dependent on the frequency of the ac source.

Answer 21

-REACTANCE

Question 22

is the opposition to alternating current in a capacitor. It varies inversely with the frequency of the ac source.

Answer 22

-CAPACITIVE REACTANCE

Question 23

is the opposition to alternating current in a inductor. It varies inversely with the frequencny of the ac source.

Answer 23

-INDUCTIVE REACTANCE

Question 24

is the opposition to ac current by the same factor as in dc in resistive circuits.

Answer 24

-RESISTANCE

Question 25

the reciprocal of impedance in seiemens, the over all ability o an electric circuit to pass alternating current.

Answer 25

-ADMITTANCE

Question 26

the ability of the inductance and capacitance to pass ac in siemens the imaginary component of admittance.

Answer 26

-SUSCEPTANCE

Question 27

the ability of an inductor to permit current to flow.

Answer 27

-INDUCTIVE SUSCEPTANCE

Question 28

the ability of a capacitor to permit the flow of current.

Answer 28

-CAPACITIVE SUSCEPTANCE

Question 29

the current always lags behind the voltage by 90 electrical degrees. remember ELI

Answer 29

-PURELY INDUCTIVE REACTANCE

Question 30

the current always leads the voltage by 90 electrical degrees. remember ICE

Answer 30

-PURELY CAPACITIVE CIRCUITS

Question 31

the product of RMS value ofthe voltage and current.

Answer 31

-APPARENT POWER

Question 32

the power actually consumed by an AC circuit.

Answer 32

-AVERAGE/ACTIVE/REAL/TRUE POWER

Question 33

the power taken by a reactance (inductive or capacitive) in an AC circuit.

Answer 33

-REACTIVE/WATTLESS POWER

Question 34

the cosine of an angle between voltage and current in AC circuit.

Answer 34

-POWER FACTOR

Question 35

current remain in-phase with voltage real and apparent power arc equal purely passive load.

Answer 35

-UNITY PF

Question 36

current leads voltage by an angle electrical degree capacitive load.

Answer 36

-LEADING PF

Question 37

current lags voltage by anangle electrical degree inductive load.

Answer 37

-LAGGING PF

Question 38

there is a phase difference of 90 electrical degree between current and voltage, so no useful work done purely reactive load.

Answer 38

-ZERO PF

Question 39

there is a phase difference of 90 electrical degree between current and voltage, so no useful work done purely reactive load.

Answer 39

-ZERO PF

Question 40

purely inductive load. zero leading. purely capacitive load.

Answer 40

-ZERO LAGGING

Question 41

is the measure of its quality. The more perfect the inductor, the higehr its Q value.

Answer 41

-THE Q OF AN INDUCTOR

Question 42

the Q of a coil is also known as the

Answer 42

-MERIT OF A COIL