AC CIRCUIT POWERLINE

premopremo remo · 75問 · 2年前

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問題一覧

The period of a wave

time required to complete one cycle

A sine wave has a frequency of 200 Hz the time period will be

100π

For a frequency of 200 Hz, the line period will be

0.0005 s

An AC current is given by I = 200 sin 100 πt. It will achieve a value of 100 A after _____ second

1/600

The rms value value of a sine is 100 A. its peak value is

141.4 A

** What is the rms value of an AC current

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

The voltage of domestic supply is 220 V. This figure represents

rms value

For a sinusoidal wave of maximum value 30 amperes, what is the average value over half cycle

19.09 A

In the case of an unsymmetrical alternating current the average value must always be taken over

the whole cycle

The rms value and mean vlue is the same in the case of

squre wave

An AC voltage of 50 Hz has maximum value of 50 V. Its value after 1/600 second after the instant the current is zero will be

25 V

A sine wave of voltage varies from zero to maximum of 200 V. How much is the voltage at the instant of 30° og the cycle?

100 V

The rms value of a half wave rectified current is 100 A. Its value for full wave rectification would be ______ amperes

141.4

For the same peak value which of the following wave will have the highest rms value?

square wave

The instantaneous voltage and current equations of an ac circuit are v(t) = 8 sin 3t volts and i(t) = 2 sin 3t ampere respectively. What is the instaneous form of power?

p(t) = 16 sin^2 3t

The instantaneous voltage equationid represented by v(t)= 169.7 cos (377t - 150°). its rectangular complex expression

60-j103.9 volts

What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

90°

What is the rms value of complex current having fundamental, dc component, 3rd harmonic and fifth harmonics rms component of 10A,5A,3A and 1.5A respectively.

11.67 A

In a pure resistive circuit

current is in phase with the voltage

* Power factor of electric bulb is

Unity

In a purely inductive circuit, the current lags the voltage by

one fourth of the cycle

In a purely inductive circuit

actual power is zero

In a pure inductive circuit if the supply frequency is reduced to 1/2 the current will

be doubled

A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to

the statement given is false

Which of the following circuit component opposes the change in the circuit voltage?

capacitance

The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If the frequency is increased to 100 Hz, reactance becomes

10 ohms

*** A capacitor of 100 kVAR, 400 V snd 50 Hz. what id the capacitor rating at 60 Hz, 230 V in kVAR?

Which of the following AC device is used to measure the angle between the voltage and its current?

phase angle meter

The ratio of active power to appear power is known as ______ factor

power

All definition of power factor of a series R-L-C circuit are correct except

ratio of net reactance and impedance

In an AC circuit, a low value of kVAR compared with kW indicates

high power factor

The input of an AC circuit having power factor of 0.8 lagging is 40 kVA. The power drawn by the circuit is

32 kW

* A washing machine is in effect and R-L circuit. If the machine takes 311 W and 4.5 A from a 115 V source when operating normally. Find its power factor.

0.60 lagging

The apparent power drawn by an AC circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

6 kVAR

A circuit drawns rms current of I=5-j4 amperes from source voltage of Vrms =150+j180 volts. What is the complex power expression of the circuit?

30 - j 1500 VA

* A coil drawns 0.5 from a 120 V, 60 Hz source at 70% lagging power factor, what are the coil resistance in ohms and inductance in H?

R = 168 and L = 0. 455

* In a series RC circuit, the voltage across the capacitor and the resistor are 60 V and 80 V respectively. What is the total voltage of the circuit?

100 V

In a circuit containing R, L AND , power loss csn tale a place in

R only

In a R-L-C circuit the impedance is given by

Z=√R^2+(Xl-Xc)^2

An alternsting voltage V=160+j120 V is applied to a circuit and the subsequent current flowing I=-6+j15 A. The impedance of the circuit is

3.2-j12

**A resistance R and inductive reactance X are connected in series across 2.4 kV rms absorbs 288 kW at 0.8 power factor. Find the value of R & X in ohms

12.8 & 9.6

* A coil of wire having a value of 10+j16 ohm is connected in series with a capacitance reactance Xc and this series combinstiin is then connected in psrallel with residtor R. if the equivalent impedance of the circuit is 8+j0 ohm what is the value of Xc in ohms?

A factory has an average demand of 150 kW at 70.7% power factor. What is the minimum size of capacitor required to raise the power factor to 95%?

101 kvar

The best place to install a capacitor is

across the terminals of the inductive load

In a series circuit on resonance following will occur expect

Vl = Vr

In a series resonant circuit the voltage across the circuit is the current of the circuit is

maximum

In series R-L-C circuit draws current at leading power factor at

less than resonant frequency

** An LC series circuit with an inductance L and a capacitor C has an oscillation frequency of f. Two inductor each with inductance L and two capscitor each with capacitance C1 are well wired in series nd the circuit is completed. The oscillation frequency is ___________

* When the frequency of oscillatorin a series RLC circuit is doubled

the capacitive reactance is halved

*** An LC circuit ha an oscillation frequency of 10^5 Hz. If C =0.1 microfarad. L must be about

2.5 mH

* A series circuit consists of a 20 ohm resistor, a 0.20 H inductor and 50 microfarad capacitor. If a variable frequency 120 V source is connected across its terminal, what is the resonant frequency in Hz?

What is the quality factor Q of an RLC SERIES circuit having R = 5 ohm, H = 10 mH and C = 100 uF

** Calculate the inductance in mH required to resosnante at 1.0 Mhz with a capacitance of 10 pico farad

2.53

The quality factir of R-L-C circuit will increase if

R decreases

The bandwitdth of a resonant circuit with 20mH inductance is 200 rad/sec. What is the resistance in ohms?

at half power points of a resonance curve the current is _____ times the maximum current

1/√2

An RLC series circuit consists of a resistance of 1000 ohms, an inductance of 100 mH and a capacitance of 10 pF. if the voltage of 100 volts is applied across the combinatiin, find the lower half power frequency

158.2 kHz

What is the dynamics imoedance of a a parallel resosnant circuit if C = 100 uF, R = 1 ohm and L= 100 mH

1000 ohm

A source woth an impedance of Zs = 100+j100 ohm is connected to the primary coil transformer and an impedance Zl is connected to the secondary coil. If the transformer has 100 turns in the primary coil and 100 turns in the secondary coil the greatest will be dissipated in the impedance ZL = _________ ohms

100-j100

In a series resonant circuit the voltage across the circuit is the same as the voltage across

inductance

The rms value of sine wave is equal to

0.707 max value

The instantaneous equation of a voltage is given as 325.3 sin377t volts, What is the rms value of the voltage?

230 volts

What is the average value of a sinusiondal wave with 100 ampere amplitude?

63.7 Amp

What is the rms and aversge value in in amperes of a half wave rectified sinusoidal wave with 20 ampere amplitude?

10 & 6.37 A

For 381 volt peak value triangular wave, What is the RMS and average voltage?

220 & 190.5 volts

The complex expression of voltage is 300 cis 90 deg. What is its instantaneous equation?

424.4 sin (wt+90)

An alternating voltage is given by V = 30 sin 314t. What is the time taken by the voltage to reach 30 volts for the first time?

0.015 second

Find the sum of two voltages v(t)1 = 90 (wt-120°) and v(t)2 = 90 SIN (wt+30)V

155.9 sin wt volts

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

63.7 volts

The average value if a sinusoidal current is 100 ampere, What is its rms value?

111 A

What is the form factor of half wave rectified sinusoidal wave?

1.57

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

12.74 amp

A circuit carries a direct current of 10 amperes on which is super imposed a sinusoidal component of 5 amp maximum value. What is the value of the rms effective current?

10.6 amp

What is the reactance offered by a 50 mH inductance are connected to a 100 volt source of frequency 60 hz?

18.85 ohm

In series R-L circuit, the power factor cannot be greater than _______ and or cannot be less than _______

(1,0)

Determine the power angle in the series circuit which consist of R=25 ohms and L = 0.2 H across a power supply of 220 volts, 60 hertz

71.7 deg

A circuit drwas rms current of I=4+j3 amperes from a source a voltage Vrms=80+j60 volts. What is the power of the circuit?

500 watts

A 50 mH inductance is connected in series with a 20 ohm resistor. If the voltage is 220 volts 60 Hz, What current is drwan?

8 amperes

A impedance drwas a current of 24 amperes at 0.8 lagging power factor from a source voltage of 240 volts, 60 Hz. What is the reactive power of the circuit

34.56 Var

find the value impedance which requieres -1540 VAR at 230 V and 10 A

17.09 - j 15.39 ohms

A coil is with resistsnce of 1.0 ohm has an inductance of 26.5 mH. It is supplied from a 220 volts 60 Hz source. What is the quailty factor of the coil?

What is the reactance of an ac circuit having 20 ohms inductive reactance and 10 ohms capacitive reactance.

10 ohms

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

90.9%

* Find the power factor of a circuit absorbs 1.5 kW for 230 V input voltage and a 8 A current

0.815

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

A current is represented by its equation 10 sin(wt+30°) and 5 sin (3wt-30°). The magnitudes of the components are instantaneous values. What is the rms value if the current?

7.9 amperes

The voltage and current of an ac circuit are V=200cis0° volts abd I=8cis(-30°) amp. respectively using current conjugate method determine the apparent power inncomplex form.

1385.6+j800 volt-amp

An inductor draws 2A of current at 120 volts, 60 Hz. Determine the inductance

58.36 mH

A capacitor draws 2A of current at 120 volts, 60 Hz. Determine the capacitance

44.2 micro farad

An impedance draws 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 powernis drawn?

1280 watts

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

A resistance R and inductive reactance X are connected in series across 2.4 kV rms absorbs 288 kW at 0.8 power factor. Find the value of R & X in ohms

A 40 micro farad capacitor is connected in series with a 40 ohm resistor. If the voltage is 220- V, What is the current?

2.84 amperes

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

44.7 volts

A 25 ohm resistor connected in series with a coil 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, what is the current?

4.47 amperes

A 25 kVa load with a power factor 0.80 lagging has a group of resistive heating units added at unity power unity power factor. How many kW do these units takes, if the nee overall power is 0.85 lagging?

1.25

an impedance of 20+j60 ohms is shunted by lossless capscitor of 50 ohms impedance. Find the input impedance

100-j100

100

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 capacitsnce C is 5 micro farad. Calculate the voltage across C

-200-j200

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