A series RLC circuit resonates at 1 MHz. At frequency of l.l MHz, the circuit impedance will be :
(a) capacitive (b) inductive (c) resistive (d) none of these Ans: B
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In band pass filter, the series element is :
(a) capacitive (b) inductive (c) scries combination of L and C (d) shunt combination of L and C Ans: C
The phase angle for a series RC circuit may be computed as the angle between the following phasors.
(a) resistance, impedance (b) resistance, rectance (c) resistance, impedance (d) none of these Ans: A
The power factor for a circuit is of the order of ________.
(a) 0.30 (b) 0.40 (c) 0.50 (d) 0.60 Ans: D
In a band stop filter, the shunt element is :
(a) capacitive (b) inductive (c) series combination of L and C (d) shunt combination of L and C Ans: C
In band pass filter, the shunt element is :
(a) capacitive (b) inductive (c) series combination of L and C (d) shunt combination of L and C Ans: D
The time constant of the capacitance circuit is defined as the time during which voltage across the capacitor
(a) falls to 36.8% of its final steady value (b) rises to 63.2% of its final steady value (c) rises to 38.6% of its final steady value (d) none of the above Ans: B
The power factor for a purely resistive circuit has a value of _____ while a purely inductive circuit results in a value of _____ .
(a) 0, 1 (b) 1,0 (c) 0,-1 (d) -1,0 Ans: B
An active network has _______.
(a) no current source (b) no e.m.f. source (c) neither of the above (d) either of the above Ans: D
In the circuit shown, the ammeter reads 1 ampere and voltmeter 10 volts. The internal resistance of the ammeter is 1 ohm and that of voltmeter is 50 ohms. The value of R is _______.
(a) 111 .2 ohms (b) 120 ohms (c) 100 ohms (d) 112 ohms Ans: D
A capacitor Cat timer = 0+ with initial charge: Q0 acts as :
(a) short circuit (b) open circuit (c) current source (d) voltage source Ans: D
If the wire which is vertical to this page has electron How downward the conductor will have ________.
(a) no magnetic field (b) a counter - clockwise field in the plane of the paper (c) a clockwise field in the plane of the nape 1 (d) a counter - clockwise field in the plane perpendicular to the paper. Ans: B
In RLC circuits, the current at resonance is :
(a) maximum in parallel resonance and minimum in series resonance (b) maximum in series resonance and minimum in parallel resonance (c) maximum in both series and parallel resonances (d) minimum in both series and parallel resonances Ans: B
At resonance in a series RCL circuit the applied voltage equals the _____ voltage drop.
(a) resistive (b) inductive (c) capacitive (d) reactive Ans: A
The circuit whose properties are not the same in either direction is known as :
(a) unilateral circuit (b) bilateral circuit (c) reversible circuit (d) irreversible circuit Ans: A
In a series RLC circuit at resonance, with Q = 5, the voltage across capacitor is :
(a) equal to the applied voltage (b) greater than the applied voltage (c) less than the applied voltage (d) may be greater than or less than the applied voltage Ans: B
Kirchoif's voltage law cannot be used _______.
(a) with parallel circuit (b) to find current in a circuit (c) to find voltage across a resistor in a series circuit (d) none of the above Ans: D
The value of current at resonance in a series RLC circuit is affected by the value of :
(a) R (b) L (c) C (d) ail the three Ans: A
The phase relationship between wave A and B starting at 60° and 30° respectively is _______.
(a) A leads B by 30° (b) A lags B by 90° (c) B leads A by 60° (d) B lags-4 by 60° Ans: B
Two 1kΩ, 1 watt resistors are connected in parallel. Then combined resistance and wattage rating will be :
(a) 2k Ω, 1 watt (b) 500 Ω, 2 watts (c) 500 Ω, 1 watt (d) 1k Ω, 2 watts Ans: B
Two resistances are connected in parallel and each dissipates 20 watts. The total power supplied by the voltage source equals :
(a) 20 watts (b) 40 watts (c) 10 watts (d) 80 watts Ans: B
A source Vs = 200 cos(ωt) delivers power to a load at power factor 0.8 lagging. The reactive power is 300 vars. The P(Sub)av, is given by
(a) 200 watts (b) 225 watts (c) 400 watts (d) 300 watts Ans: C
An electrical circuit having one or more voltage sources is transformed into equivalent electrical network with a single voltage source (which is open circuit voltage of previous circuit) with series internal resistance of the network with all voltage sources replaced by their internal impedance. This is an illustration of:
(a) Superposition theorem (b) Norton's Theorem (c) Thevenin's theorem (d) Reciprocity theorem Ans: C
The net reactance phasor of a series RCL circuit can be found
(a) only by vectorial addition (b) by algebraic addition (c) using calculus (d) only by using trigonometry Ans: A
To find Thevenin's equivalent impedance in a circuit:
(a) all independent voltage sources are short circuited and all independent current sources are open circuited (b) all independent voltage sources are open circuited and all independent current sources are short circuited (c) all independent voltage and current sources are open circuited (d) all independent voltage and current sources are short circuited Ans: A
Norton's theorem results in :
(a) a current source with an impedance in parallel (b) a voltage source with an impedance in series (c) a voltage source alone (d) a current source alone Ans: A
In the circuit Vs = 10 cos(ωt). Power drawn by the 2 ohm resistor is 4 watts. The power factor is
(a) 0.3 (b) 0.4 (c) 0.6 (d) 0.8 Ans: C
In an RC coupling circuit the phase angle is _________.
(a) 90° (b) close to 0° (c) -90° (d) 180 Ans: C
Equivalent Norton's current source lor the voltage source of a given circuit is :
(a) 1.25 Amp, 8 Ω (b) 1.25 Amp, 4 Ω (c) 2.5 Amp, 4 Ω (d) 2.5 Amp, 8 Ω Ans: C
Brune's method of network synthes is particularly used in ________.
(a) RC network (b) RL network (c) RLC network (d) none of these Ans: C
The double energy transients occur in the ________.
(a) R - L circuit (b) R - C circuit (c) pure inductive circuit (d) R-L-C circuit Ans: D
Inductances (equal value connected in parallel) results in
(a) more inductance than a single (b) less inductance than a single (c) equal to a single inductance (d) none of above Ans: B
The power dissipated in a series RC circuit with R = 10 ohms and X = 10 ohms carrying an effective current of 3 amp is --- watts
(a) 30 (b) 30 v2 (c) 90 (d) 90 v2 Ans: C
A cube is constructed by soldering together twelve 1Ω resistance wires to represent the twelve edges. The resistance between any two diagonally opposite corners will be :
(a) 1 Ω (b) 12 Ω (c) 5/6 Ω (d) none of these Ans: A
The following is a linear element ________.
(a) transistor (b) diode (c) heater element (d) electron tube Ans: C
If four resistors each of 4 kΩ are connected in parallel, the net resistance is _______.
(a) 1k Ω (b) 16k Ω (c) 2k Ω (d) 8k Ω Ans: B
Millman's theorem is best to find ________.
(a) equivalent voltage source (b) equivalent voltage and resistance of a circuit (c) equivalent voltage or current source (d) none of above Ans: C
The short circuit natural frequency at port (1) is given by
(a) S = -1 (b) S = -3 (c) S = -4 (d) none of these Ans: A
In series resonance circuit the voltage source is _______.
(a) low resistance (b) high resistance (c) zero resistance (d) none of the above Ans: A
If four 80 µf capacitors are connected in parallel, the net capacitance is
(a) 20 µf (b) 40 µf (c) 160 µf (d) 320 µf Ans: D
If No. of branches in a circuit is b, No. of nodes is n and No. of independent loops is l then the number of independent current laws will be
(a) n+l-1 (b) b-n (c) b-l (d) n-l Ans: D
If a wire conductor of resistance 0.4O is doubled in length, its resistance becomes :
(a) 0.4 O (b) 0.8 O (c) 0.2 O (d) 0.1 O Ans: B
A capacitor used in a 240 volt, a.c. line should have a peak voltage rating of ______.
(a) 240 volts (b) 340 volts (c) 120 volts (d) 720 volts Ans: B
With electrical appliances, the power rating is determined by _______.
(a) current (b) voltage (c) copper loss (d) iron loss Ans: C
In an impedance function, a pole at infinity is realized with the use of :
(a) a capacitance in series (b) an mduciance in series (c) an inductance in parallel with the driving point terminals (d) none of these Ans: B
A coil of 6 Henry develops a counter of 12 volts. The rate of change of current flow must be ______.
(a) 1 amp/sec (b) 6 amp/sec (c) 2 amp/sec (d) 12 amp/sec Ans: C
In the given RC circuit, the current is i(t) = 2cos5000t Amp. The applied voltage in volts is :
(a) 28.28 cos (50001-45�) (b) 28.28 cos (5000/+ 45�) (c) 28.28 sin (5000/-45�) (d) 28.28 sin (5000/+ 45�) Ans: A
In the given RC circuit, the current is i(t) = 2cos5000t Amp. The applied voltage in volts is :
(a) 28.28 cos (50001-45°) (b) 28.28 cos (5000/+ 45°) (c) 28.28 sin (5000/-45°) (d) 28.28 sin (5000/+ 45°) Ans: A
A pole of a driving point impedance function signifies :
(a) an open circuit at that complex frequency (b) a short circuit at that complex frequency (c) none of these (d) 100 impedance Ans: A
State variable approach of network analysis is a ________.
(a) direct time domain approach (b) Laplace transform approach (c) z-transform approach (d) none of these Ans: A
There are three 100 bulbs in parallel across 220V, 50 Hz line. If one bulb burns out:
(a) remaining two wili not operate (b) all the three will produce light (c) there will be heavy current in the mains line (d) remaining two bulbs will produce light Ans: D
As frequency increases inductive reactance ______ and capacitive reactance ______.
(a) increases, increases (b) increases, decreases (c) decreases, increases (d) decreases, decreases Ans: B
The hot resistance of a bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is :
(a) zero (b) negative (c) positive (d) about 2 O per deg C Ans: C
Time constant of a capacitance circuit may be defined as the time during which voilage :
(a) rises to 63.2% of its final steady value (b) rises to 38.6% of its final steady value (c) falls to 38.6% of its final steady value (d) none of these Ans: A
The polarity of the voltage drop across a resistor in a charging RC circuit is______.
(a) opposite to its polarity when the network is discharging (b) some to its polarity when the network is discharging (c) opposite for some time and then same lor the remaining duration (d) none of these Ans: A
In a parallel circuit with registers R1 R2 and R3 shunted across a battery
(a) the current is same in each resistor (b) the voltage is the same across each resistci (c) the voltage is proportion to the not resistance (d) the voltage across each resistance is dependent on the value of the resistors Ans: B
Cells are connected in scries to :
(a) increase the current rating (b) increase the voltage rating (c) decrease the internal resistance (d) none of these Ans: B
Transient currents are associated with the _______.
(a) resistance of the current (b) impedance of the circuit (c) changes in the stored energy in the inductors and capacitors (d) applied voltage to the circuit Ans: C
The period of a periodic curve is _______.
(a) the same as frequency (b) expressed in volts (c) measured in wave lengths (d) the time required to complete 1 cycle Ans: D
In the given circuit, the current is :
(a) 2.5 sin(1000t) (b) -2.5sin(1000t) (c) 2.5cos(1000t) (d) -2.5 cos(1000t) Ans: D
Rheostats are usually rated in _______.
(a) Watts and Amperes (b) Watts and Volts (c) Volts and Amperes (d) Amperes Ans: A
The transient current in a circuit are due to :
(a) voltage applied to the circuit (b) impedance of the circuit (c) resistance of the circuit (d) changes in the stored energy in inductors and capacitors Ans: D
The power dissipated by a series RCL circuit is _____ at the resonant frequency and is equal to _____.
(a) minimum, I 2 R (b) minimum, I 2 R/2 (c) maximum, I 2 R (d) maximum, I 2 R/2 Ans: C
When two 2-port networks are connected in tandem, it is convenient to use :
(a) open circuit impedance parameters (b) short circuit admittance parameters (c) hybrid parameters (d) transmission parameters Ans: D
A coil has self resistance of 5O and XL = 1000O at frequency of 1 MHz. The value of Q is :
(a) 200 (b) 100 (c) 40 (d) none of these Ans: A
A four terminal network constitutes a :
(a) one port network (b) two port network (c) four port network (d) none of these Ans: B
The energy stored in any twe charges in any electric field as a result of electrostatic force is termed as ______.
(a) capacitance (b) electric intensity (c) potential difference (d) none of these Ans: C
A 100 volt source with an internal resistance 45 ohms is connected across a wire wound resistor. The maximum power will be dissipated in the resistor when its resistance equals
(a) zero (b) 100 ohms (c) 45 ohms (d) infinity Ans: C
In the given R-C circuit, the current reaches its maximum value :
(a) after 50 �s of turning on the switch (b) after 100 �s of turning on the switch (c) after 1000 �s of turning on the switch (d) immediately after turning on the switch Ans: D
In the given R-C circuit, the current reaches its maximum value :
(a) after 50 µs of turning on the switch (b) after 100 µs of turning on the switch (c) after 1000 µs of turning on the switch (d) immediately after turning on the switch Ans: D
The impedance function of a ladder network may be readily computed using :
(a) matrices (b) Laplace transform (c) Fourier transform (d) continued fraction Ans: D
In a series RLC circuit at resonance, with Q=10, the voltage across inductor is :
(a) equal to the applied voltage (b) greater than the applied voltage (c) less than the applied voltage (d) may be greater than or less than the applied voltage Ans: B
Whenever two charges are separated, there exists _______.
(a) electromotive force (b) an electromagnetic force (c) a magnetic field (d) none of these Ans: A
When a lead acid battery is charged ________.
(a) the battery voltage must be more than charging voltage (b) connect the positive battery terminal to the negative on charging voltage (c) the charging current must flow in the same direction as the discharging current (d) connect negative and positive to positive. Ans: D
ECE Mcqs Which of the following statement is true ?
(a) iron core has maximum eddy current losses (b) laminated iron core has minimum eddy current losses (c) power at iron core has maximum eddy current losses (d) air core has the minimum eddy current losses Ans: B
The given shunt tuned circuit resonates at a frequency of 40 MHz. It will _______.
(a) bypass all signals of 40 MHz (b) permit flow of signal of 40 MHz (c) act as a peaking coil with large band width of 40 MHz (d) none of these Ans: B
Z = R + sL. Given R = 10O. and L = 0.1H. The Bode plot of |Z| has
(a) two asymptotes of zero slope and 20 dB / decade slope intersecting at corner ? = 1OC (b) two asymptotes of slopes zero and 20 dB / decade intersecting at ? = 10 (c) two asymptotes of slopes zero and 20 dB / decade intersecting at ? = 1 (d) two asymptotes of slopes 20 dB / decade and 40 dB / decade intersecting at ? = 1 Ans: A
Given H(s) = 2S/[1+S/10][1+S/10,000] The Bode plot has a region of constant |H(?)| of value
(a) 6 dD (b) 20 dB (c) 0 dB (d) 26 dB Ans: D
120 [Update] CIRCUIT THEORY AND ELECTRIC NETWORKS Multiple choice questions and answers for freshers and experienced pdf
Latest CIRCUIT THEORY AND ELECTRIC NETWORKS Objective type Questions and Answers 1. Given H(s) = 2S/[1+S/10][1+S/10,000] The Bode plot has a region of constant |H(?)| of value 2. Z = R + sL. Given R = 10O. and L = 0.1H. The Bode plot of |Z| has 3. The given shunt tuned circuit resonates at a frequency of 40 MHz. It will 4. Which of the following statement is true ? 5. Whenever two charges are separated, there exists 6. When a lead acid battery is charged 7. In a series RLC circuit at resonance, with Q=10, the voltage across inductor is : 8. The impedance function of a ladder network may be readily computed using : 9. The current 1 in the figure is 10. In the given R-C circuit, the current reaches its maximum value : 11. A 100 volt source with an internal resistance 45 ohm...
120 [Update] CIRCUIT THEORY AND ELECTRIC NETWORKS Multiple choice questions and answers for freshers and experienced pdf
Latest CIRCUIT THEORY AND ELECTRIC NETWORKS Objective type Questions and Answers 1. Given H(s) = 2S/[1+S/10][1+S/10,000] The Bode plot has a region of constant |H(?)| of value 2. Z = R + sL. Given R = 10O. and L = 0.1H. The Bode plot of |Z| has 3. The given shunt tuned circuit resonates at a frequency of 40 MHz. It will 4. Which of the following statement is true ? 5. Whenever two charges are separated, there exists 6. When a lead acid battery is charged 7. In a series RLC circuit at resonance, with Q=10, the voltage across inductor is : 8. The impedance function of a ladder network may be readily computed using : 9. The current 1 in the figure is 10. In the given R-C circuit, the current reaches its maximum value : 11. A 100 volt source with an internal resistance 45 ohm...
Which statement regarding endfire array is wrong ?
(a) there is no radiation at right angles to the plane of array (b) it has a dipole spacing of X/2 (c) it is called a linear resonant dipole array (d) it has narow bandwidth Ans: B