Electrical Engineering · Question Bank

1P AC Circuits

77 of 161 questions match · page 1 of 4. Answer in your head first, then check the solution.

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#1📜 EE Pre-Board August 2012📘 PowerhouseMedium
A coil has a 50 ohms resistance and a 70 ohms reactance. A capacitor is connected in parallel to produce resonance. The source voltage is 120 V. What is the power drawn by the circuit?
A162 W
B132 W
C97 W
D52 W
#2📜 EE Pre-Board August 2012📘 PowerhouseEasy
When two capacitors of reactances 10ohms and 20 ohms are connected in parallel across a 100 V supply, total VAR drawn will be _.
A500
B2
C1,500
D15
#3📜 EE Pre-Board August 2012📘 PowerhouseEasy
What is the quality factor Q of an RLC series circuit having R = 5 ohms, L = 10 mH and C = 100 μF?
A2
B5
C10
D20
#4📜 EE Pre-Board August 2012📘 PowerhouseEasy
A circuit which has \(\omega_0 = 10^{6}\) rad/sec, C = 10 pF and Q = 100, must have a resistance of _ kΩ.
A10
B5
C1
D100
#5📜 EE Pre-Board August 2012📘 PowerhouseEasy
Determine the value of R for which power consumed in it is maximum when it is connected in series with a coil of resistance 3 Ω and reactance 20 Ω across 230 V, 60 Hz AC supply.
A20 Ω
B3 Ω
C6.67 Ω
D20.22 Ω
#6📜 EE Pre-Board August 2012📘 PowerhouseMedium
Impedance \(Z_1 = 10 + j15\) ohms and another impedance \(Z_2 = 6 - j8\) ohms are connected in parallel across a 60 Hz source. Find the total power in watts if the total current is 15 A.
A1,845 W
B2,176 W
C3,188 W
D2,380 W
#7📜 EE Pre-Board August 2012📘 PowerhouseEasy
A complex current wave is represented by the equation \(i = 5 + 5\sin(120\pi t)\) A. Find its average value in amperes.
A4.5
B6
C5
D4
#8📜 EE Pre-Board August 2012📘 PowerhouseMedium
The rms value of the complex voltage given by \(v = 16\sqrt{2}\sin \omega t + 12\sqrt{2}\sin 3\omega t\) is
A\(20\sqrt{2}\) V
B20 V
C\(28\sqrt{2}\) V
D192 V
#9📜 EE Pre-Board March 2013📘 PowerhouseMedium
A coil draws 1,875 watts when connected to a 150 V DC source. It consumes 3,072 watts when connected on 240 V, 60 Hz AC source. Find the inductance of the coil.
A0.0255 H
B0.0153 H
C0.0341 H
D0.0240 H
#10📜 EE Pre-Board March 2013📘 PowerhouseMedium
What capacitance must be placed in series with an inductance of 0.05 H so that at 100 Hz, the impedance becomes equal to the ohmic resistance?
A50.7 μF
B70.7 μF
C35.5 μF
D87 μF
#11📜 EE Pre-Board March 2013📘 PowerhouseMedium
Find the average power in a resistance R = 10 ohms if the current in Fourier series form is \(i = 12\sin\omega t + 8\sin 3\omega t + 3\sin 5\omega t\) amperes.
A1,150 W
B1,027 W
C1,085 W
D1,203 W
#12📜 EE Pre-Board March 2013📘 PowerhouseEasy
To a series RLC circuit, a voltage of 10 V is applied. If Q of the coil at resonant frequency is 20, the voltage across the inductor will be _____.
A2 V
B50 V
C100 V
D200 V
#13📜 EE Pre-Board March 2013📘 PowerhouseEasy
What is the half power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
A1.65 kHz
B16.5 MHz
C16.5 kHz
D165 kHz
#14📜 EE Pre-Board March 2013📘 PowerhouseEasy
A voltage of \(e = 7.07\sin 50t\) V is applied to a series circuit containing a resistance of 4 ohms and an inductance of 60 mH. What is the impedance of the circuit in ohms?
A\(5\angle 30^\circ\ \Omega\)
B\(5\angle 60^\circ\ \Omega\)
C\(5\angle 53.13^\circ\ \Omega\)
D\(5\angle 36.87^\circ\ \Omega\)
#15📜 EE Pre-Board March 2013📘 PowerhouseMedium
An impedance draws a current \(i = 10\cos(\omega t - 30^\circ)\) from a voltage \(v = 220\sin\omega t\). What is the maximum power?
A1,100 W
B2,200 W
C1,320 W
D190.5 W
#16📜 EE Pre-Board August 2013📘 PowerhouseMedium
A current is given by the expression \(i = 2.5\sin\omega t + 0.8\sin 3\omega t + 0.5\sin 5\omega t\). What is the rms value of the current?
A1.54 A
B2.6 A
C2.54 A
D1.89 A
#17📜 EE Pre-Board August 2013📘 PowerhouseMedium
An inductor in series with a 5 μF capacitor is connected to a supply of 20 V, 796 Hz. What is the inductance needed to make the current 5 A leading?
A0.002 H
B0.007 H
C0.004 H
D0.008 H
#18📜 EE Pre-Board August 2013📘 PowerhouseEasy
To a series RLC circuit, a voltage of 10 v is applied. If Q of the coil at resonant frequency is 20, the voltage across the inductor at resonant frequency will be.
A200 v
B100 V
C75 v
D50 v
#19📜 EE Pre-Board August 2013📘 PowerhouseEasy
A resistance of 40 ohms and inductance of 79.6 mH are connected in parallel across a 240 v, 60 HZ ac supply. Find the total current in amperes.
A11
B12
C10
D14
#20📜 EE Pre-Board March 2014📘 PowerhouseEasy
The value of form factor for a pure sine wave is
A1.414
B0.707
C0.637
D1.11

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