AC CIRCUIT PASS REVIEWER

premopremo remo · 75問 · 2年前

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問題一覧

What is the period of a sinusoidal wave form having 100 MHz frequency?

10ns

What is the angular frequency of a wave form having a period of 1 msec?

2000pi rad/s

The complex expression of voltage is 300 cis 30 deg. What is its instantaneous equation?

424.4 sin (wt + 90°)

The instantaneous of a voltage is given as 100 sin 314 t volts. What is its average value?

63.7 Volts

The average value of a sinusiodal current is 100 ampere. What is its rms value?

111 A

What is the peak factor of half wave rectified ac?

1.57

In pure resistive circuit the instantaneous voltage and current are given by v(t) = 250 sin 314t volts and i(t)= 10 sin 314t amperes. What is the average power?

A current is represented by its equation 10 sin(wt+30°) and 5 sin (3wt-30°). The magnitude of the components aee instantaneuos values. What is the Rms value of the current?

7.9 amperes

The power factor of the circuit is 0.866 lagging. If the power input is 600 watts at a voltage of Vrms=110 sin (377+10°). What is the instantaneous current?

8.9 sin (377t-20°)

A load draws current from a voltage source. The equation of the voltage current are I=10sin(wt+30°) and V=220 cos(wt-60°) What is the power?

2200 watts

The instantaneous voltage and current equations of an ac circuit are vt=200 sin 377t volts and i(t) = B sin(377t-30°) amp respectively. Determine the apparent power in complex form.

692.8+j400

Two impedances Z1= 0.8+j5.6 and Z2= 8-j16 and a single phase motor are connected in parallel across 200 Vms. 60 Hz supply. The motor draws 5 kVa at 80% power factor lagging. By current conjugate method, find the complex power of impedance Z2?

1-j2 kVa

An inductor draws 5A of current at 120 volts, 60 Hz. Determine the capacitance in micro farad.

44.2

A circuit has impedance of 3.463+j2.0 ohm is supplied from a source voltage of 240 volts, 60 Hz. What is the current when resistance is reduced by 50%

91 A

A resistance of 30 ohms and an inductive reatance of 60 ohms are in series across 120 volts, 60 cycles source. Find the power factor in percent of the circuit?

A coil connected in series with resistance are supplied from a 240volt 60 Hz source drsw 1.0 ampere current. The voltage across the series resistance and across the coil are both equal to 160 volts Find the value of coil resistance.

A coil is with resistance of 1.0 ohm has an inductance of 265 mH. it is supplied from a 220 volt 60 Hz source. What is the quality factor of the coil?

100

A series circuit has 50 ohm resistance 2.22 micro farad capacitance and inductance of 8 mH inductance. Find the total impedance at 796 Hz frequency.

50 - j 50

A series circuit with 2 amperes flow through a 20 ohm resistor 50 ohm inductive reactance and 60 ohm capacitive reactance. What is the supply voltage?

44.7 volts

A series RLC circuit is excited by a 100 volts 79.6 Hz source. Resistance R is 100 ohms, inductance L is 1 H and capacitance C is 5 micro farad. Calculate the voltage across C

282.8<-135°

A 10 ohms resistor is connected in parallel to Z=3+j4 ohms. What is the power factor?

0.809

A source of 100 volts rms is supplying a resistance 80 ohms in parallel with a 200 mH inductor. To what angle is current lag or lead?

46.7 deg. lag

Two impedances Z1=2+j4 and Z2=R+j0, sre connected in parallel. Determine R so that he pf of the circuit is 0.9 lagging

3.2 ohms

Two impedances Z1=2+j3 andZ2=3+j6 are connected in parallel. The apparent power of the second branch is 1490 VA. Determine the total load complex power.

2202+j3636

A capacitor drawns 2A of current at 120 volts. 60 Hz. Determine the capscitsnce in micro farad

44.2

An impedance of Z1=4+j4 ohms is connected in parallel with an impedance Z2=12+j6. The input reactive power is 2500 var lagging. What is the total active power?

3025 W

A 15 ohm resistor connected in parallel with an impedance of 8-j2 ohm across an ac source. The entire circuit takes a totsl average power of 2000 watts. What id the average power in the 15 ohm resistor

723 W

A coil has resistance of 10 ohms and draws a current of 5A when connected across 100 v, 60 hz source. Determine the reactive power

4.2

A factory has an average demand of 176 kw at 70% power factory. What is the minimum size of capacitor requiered to raise the power factor id 95%

122 kvar

A single phase induction motor draws 10 A at 75% pf. The voltage is 220 V. A capacitor is 50 uF is installed to improve power factor. What is the resulting power factor?

95%

The power factor of a load on a 120 volts 60 Hz source is raised from 0.707 to 0.866 lsgging by connecting a 53 micro farad capscitor the load. What is the true power of the load in watts?

682

A series circuit has 100 ohm resistance 100 micro henry inductance and 1 pico faraf capacitance. What is the frequency at unity power factory?

16 MHz

A 100 mH coil has an internal equivslent resistance of 15 ohms. What parallel capscitance wil cause resonance at 60 Hz frequency

60 micro farad

at parallel resonance. the circuit draws a current of 1 mA. if the Q factor of the circuit is 100. What is the current throjgh capacitor?

100 mA

What ks the dynamic impedance of a parallel resonant circuit if C1= 1 uF R=1 ohm and L=1 H?

1 M ohm

A coil of 40 ohms resistance has an inductance of 100 mhmH and is connected in parallel woth a 30 uF capacitor. What is the resonance frequency of the circuit?

66.3 Hz

A (6+j10) ohms coil is supplied by a v(t)=30 sin10t volts ac source connected in series with 12 volts battery. The internal impedance of the generator is (0.1+j2) ohms and that of the battery is negligible. determine the current through the coil by superposistion.

2.23 sin(10t-63°)+1.97 Amp

Obtain the thevenin's voltage at the terinks ab in the circuit thrown

5+j2.5 volts

Calculate the load impedance and the maximum power thst can be transffered across the load to be supplied by a 120 volts generator througb a line with a total

12.5-j50 & 288 watts

Calculate the load impedance and the maximum power that can be transferred across the load to be supplied by a 120 volts generator through a line with a total impedance of 12.5+j50 ohms

12.5-j50 ohms & 288 watts

An alternating current of rectangular wave shape has an amplitude of 10 and a frequency of one (1). What is the average current?

The instantaneous magnitude of a voltage is given as 100 sin 377t volts. What is the rms value of the voltage?

70.7 volts

An alternating current of maximum value 20 amperes lags the reference voltage by 30 degress. What is the magnitude of current 2 milliseconds after the current wave crosses the wt axis going in the positive direction?

10.23 amperes

What is the rms value of a half wave rectified sinusiodal wave with 50 ampere amplitude?

22.5 Amp

What is the average value of a half wave rectified sinusiodal wave with 70.7 ampere amplitude?

22.5 Amp

If a half wave rectified sine wave has an RMS value of 20 A, What is the average value?

12.74 Amp

For 381 V peak value triangulsr wave, the rms voltage will be equal to

220 Volts

For 184 Volts maximum value semi circular wave, the RMS voltage will be equal to

150 Volts

A current is represented by its equation 10 sin(wt + 30 deg) and 5 sin (3wt + 30 deg). The magnitude of the components are instantaneous values. What is the average value of the current?

7.42 amperes

The instantaneous value of the voltage is given by its equation v = 105 sin wt - 25 sin 3wt + 15 sin (6wt - 30 degrees). What is its RMS value?

77 volts

The voltages along points 1,2 and 3 are V12 = 57 cis(60°) and V23 = 90 cis (-30°). What is the voltage V12?

107.1 cis 2.35°

V12 is equal to 100 cis 30 degrees and V23 is equal to 50 cis 120 degrees.

111.8 cis 3.4 degrees

A single phase circuit is supplied from a 220 volts 60 Hz source draws 2000 watts of power and 10 amperes current. what is the power factor of the circuit?

90.9%

A load draws current from a voltage source. The equation of current and voltage are I = 10 cos wt & V = 220 sin wt. What is the power?

2,200 watts

The voltage and current of a load are given by thier equations V = 220 sin (wt+30) volts and I = 10 sin (wt-30°). Determine the power factor and power.

50% lagging, 1100 watts

An impedance draws a current of 10 cos(wt-30°) Amp from a voltage of 220 sin (wt+30°) Volts. What is the impedance of the circuit?

11 + j19.1 ohms

A single phase indiction motor is rated 5 hp, 75% power factor and 220 volts. What is the full load current?

22.5 amperes

The phase shift between the voltage and current vectors is due to the following loads EXPECTT one. Which one is this?

Electric flat iron

A VAR meter depends on the following values expect one. Which one is this

cosine of the phase angle

An impedance drawns a current I = 10 cos(wt-30°) Amp from a voltage V = 220 sin wt volts. What is the power?

190.5 watts

A 50 mH inductance is connected in series with a 20 ohm resistor. If the voltage is 220 volts. What power is drawn?

1280 watts

An impedance coil takes 10 amperes and absorbs 250 watts wheb connected across 220 volts. 60 Hz source. What power will it absorb when connected to 110 volt, 25 Hz mains?

339 W

A 25 ohms resistor is connected in series with a coil of 50 ohm resistance and 150 mH indictance. What is the equation of the current if the source voltage is 200sin(wt-30deg)?

2.13sin(wt-67°)

Two relays each with 10 ohm resistance and 0.16 Henry inductance are connected in series. What is the equivalent impedance?

20 + j120.63 ohm

In series RC circuit, the voltage across the capacitor and the resistor are 60 and 80 volt respectively, the total voltage is

100 V

A coil is supplied from a 200 volt and takes a current of 2 amperes at 0.707 power factor lagging. The quality of the coil is

A 50 and 100 microfarad capacitors are connected in series and across a 100 sin (wt+30). The quality of the current.

1.26 sin (wt + 120)

A 160 microfarad capacitor is connected in series with a 10 ohm resistor. write the equation of the current when the voltage is 220 volts?

I = 11.4 sin (377 t + 59 degrees)

A 40 micro farad capacitor is connected in series with a coil of 50 ohm resistance and 150 mH inductance. What is the power factor of the circuit?

80%

A 40 micro farad capacitor, 100 mH inductance and a 40 ohm resistor are connected in series. The voltage is 220 Volts, Whtmat is the current?

4.47 amperes

A 50 micro farad is connected in series woth a coil having 50 ohm resistance and 150 mH inductance. The source voltage is 100 sin (wt-30°)V. What ks the power?

198 watts

A coil with a measured resistance of 10 ohm is connected in series woth a capacitor of a certain rating, at 60 Hz impedance measured to be 10+j11.27 ohm at 30 Hz the impedance is measured to be 10-j5.735 ohm. What is indictance of the coil in milihenry?

A capacitor of 80 micro farad is connected in parallel with 20 ohm resistor. What power is draws when source voltage is V=220 sin wt volts?

2420 watts

A coil of 50 ohm resistance and of 150 mH inductance is connected is parallel with a 50 micro farad capacitor. The source voltage is 100 sin (wt + 30 deg?. What is the equation of the line current?

1.25 sin (wt + 75.5 deg)

Two current 5 + j2 and 3 - j2 enter a junction. What is the out going current?

A single phase induction motor is rated 5 hp, 75% power factor and 220 volts. What approximate size of capacitor is necessary to raise the power facgor to about 95%?

2 kvar

A load of 10,000 KVA, 85% power factor lagging is connected to a 13,200 volt line. How much reactive power in needed to correction the power factor to 97% lagging?

3,138 KVAR

Whatsm capacitance must be placed in series with an inductance of 0.05 H so that at 100 Hz. the impedance become equal to the ohmic resistance?

50 uF

One leg of a radio tuned circuit has a capacitance of one times ten the minus nine farad. it is turned at 200 KHz. What id the inductance of the other leg in henry?

6.33×10^-4

A coil of 40 ohms resistance has an inductance of 100 mH and is connected in parallel with a 40 uF capacitor. What is the resonance frequency of the circuit?

47.75 Hz

A 5 mH pure inductance is connected in parallel with 1.0uf capacitor. at what frequency shall the circuit be in anti resonance.

2250 hertz

A coil has a 50 ohms resistance and a 70 ohm reactance. A capacitor is connected in parallel to produce resonance. The source voltage is 120 V. What is the power drwan by the circuit.

97 watts

A 220 volts source delivers 5 amperes to a series circuit composed of 20 ohm resistor, 100 mH inductor and 250 microfarad capacitor, what is the source frequency in Hz?

75.75

A 100 mh inductance is connected in parallel with a 40 ohms resistor. what is the power drawn if the voltage is 220 volts?

1210 watts

A series circuit is composed of a 100 phm resistor and a 20 micro farad capacitor connected across a 240 V, 60 Hz line. Which of the following answer is wrong?

The resulting current is 0.723 A

A series circuit is composed of j4 , j6, -j9, j2 reactance. What is the total reactance?

-j

What is the reactance offered by a 100 uH inductance are connected to a 100 voltsource of frequency 3MHz?

1885 ohm

Determine the power angle in the series circuit which consist of R = 25 ohms and L = 0.2 H across a power suppky of 200 volts, 30 Hertz.

56.4 deg

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