Easy 1P AC Circuits Questions – Electrical Engineering

#1📜 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

#2📜 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

#3📜 EE Pre-Board August 2012📘 PowerhouseEasy

Which of the following frequencies has the longest period?

A1 Hz

B10 Hz

C1 kH

D100 kHz

#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📘 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

#7📜 EE Pre-Board March 2013📘 PowerhouseEasy

Which of the following produces a reactive power?

AIncandescent lamp

BInduction motor

CFlat iron

DHeater

#8📜 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

#9📜 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

#10📜 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\(5\angle 36.87^\circ\ \Omega\)

#11📜 EE Pre-Board August 2013📘 PowerhouseEasy

In a series RL circuit, the inductor current _________ the resistor current.

ALags

Bleads

Cis equal to

Dis negative of

#12📜 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

#13📜 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

#14📜 EE Pre-Board March 2014📘 PowerhouseEasy

Form factor is defined as

Arms value/peak value

Bmaximum value/rms value

Crms value/average value

Deffective value/rms value

#15📜 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

#16📜 EE Pre-Board March 2014📘 PowerhouseEasy

The rms value of a sinusoidal wave is equal to ______ of maximum value.

A0.637

B0.707

C0.506

D1.414

#17📜 EE Pre-Board March 2014📘 PowerhouseEasy

A 99 MHz radio station has a 150 μH inductor. What is the capacitance?

A0.0172 pF

B17.2 pF

C1.72 μF

D17.2 μF

#18📜 EE Pre-Board March 2014📘 PowerhouseEasy

Express the current phasor \(25\angle -30^\circ\) as an instantaneous current.

A\(17.68\sin(\omega t - 30^\circ)\)

B\(35.35\sin(\omega t + 30^\circ)\)

C\(35.35\sin(\omega t - 30^\circ)\)

D\(25\sin(\omega t - 30^\circ)\)

#19📜 EE Pre-Board March 2014📘 PowerhouseEasy

A series RLC circuit has R = 100 ohms, L = 100 μH and C = 100 pF. What is the frequency in MHz at unity power factor?

A1.59

B1.36

C15.9

D13.6

#20📜 EE Pre-Board March 2014📘 PowerhouseEasy

An inductor has a value of 44 mH at 60 Hz. What is the inductive susceptance, stated as an imaginary number?

A−j0.06

Bj0.06

C−j17

Dj17

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