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MCQOPTIONS
This section includes 179 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Inductance of a solenoid of 2500 turns wound uniformly over a length of 0.5 m cylindrical paper tube of 4 cm diameter in air medium is around: |
| A. | 19.6 mH |
| B. | 196 mH |
| C. | 1.96 H |
| D. | 1.96 mH |
| Answer» B. 196 mH | |
| 52. |
Kirchhoff’s Current Law states that |
| A. | the algebraic sum of the currents flowing into any point in a circuit must equal zero |
| B. | the algebraic sum of the currents entering and leaving any point in a circuit must equal zero |
| C. | sum of the currents flowing away from any point in a circuit must equal zero |
| D. | The currents around any closed path must equal zero |
| Answer» C. sum of the currents flowing away from any point in a circuit must equal zero | |
| 53. |
Find the value of the current flowing in 2 Ω resistor? |
| A. | 6 A |
| B. | 4 A |
| C. | 10 A |
| D. | 15 A |
| Answer» C. 10 A | |
| 54. |
A supply of 120 V is applied to three lamps connected in parallel. The power ratings of the lamps are 60 W, 40 W, and 100 W. Determine the total resistance and total current. |
| A. | R = 42 Ω, I = 2.86 A |
| B. | R = 52 Ω, I = 1.46 A |
| C. | R = 72 Ω, I = 2.46 A |
| D. | R = 72 Ω, I = 1.67 A |
| Answer» E. | |
| 55. |
In the circuit the voltage across 3 Ω resistance is |
| A. | 1 V |
| B. | 3 V |
| C. | 6 V |
| D. | 9 V |
| Answer» C. 6 V | |
| 56. |
A 15 V DC source is connected to the series combination of 4.7 μF and 10 μF capacitors. Which of the following statements is true ? |
| A. | Voltage across 4.7 μF will be more than voltage across 10 μF |
| B. | Voltage across 10 μF will be more than voltage across 4.7 μF |
| C. | Voltage across both capacitors are equal |
| D. | Charge on 10 μF will be more than charge on 4.7 μF |
| Answer» B. Voltage across 10 μF will be more than voltage across 4.7 μF | |
| 57. |
Find out the effective resistance between A and B |
| A. | 40 ohms |
| B. | 20 ohms |
| C. | 15 ohms |
| D. | 12 ohms |
| Answer» E. | |
| 58. |
Find the value of resistance (Rab) in the following circuit. |
| A. | 15 Ω |
| B. | 5.6 Ω |
| C. | 21 Ω |
| D. | 11.2 Ω |
| Answer» E. | |
| 59. |
A network N consists of resistors, dependent and independent voltage and current sources. If the current in one particular resistance is I A, it will be doubled if the values of all the |
| A. | independent voltage sources are doubled |
| B. | independent current sources are doubled |
| C. | dependent and independent voltage and current sources are doubled |
| D. | independent voltage and current sources are doubled |
| Answer» E. | |
| 60. |
In practical application, battery voltage |
| A. | is restored as soon as disconnect occurs |
| B. | is lowered as the load increases |
| C. | May be stored indefinitely |
| D. | Will be reduced to zero as power is drawn |
| Answer» C. May be stored indefinitely | |
| 61. |
Consider the following two statements1. Kirchhoffs junction law follows from conservation of charge.2. Kirchhoffs loop law follows from conservative nature of electric field. |
| A. | Both 1 and 2 are correct |
| B. | 2 is correct but 1 is wrong |
| C. | 1 is correct but 2 is wrong |
| D. | Both 1 and 2 are wrong |
| Answer» B. 2 is correct but 1 is wrong | |
| 62. |
In the circuit below, the value of resistance R is: |
| A. | 20 Ω |
| B. | 30 Ω |
| C. | 10 Ω |
| D. | 40 Ω |
| Answer» B. 30 Ω | |
| 63. |
For the figure shown below, the value of the supply voltage, 'V' is _______. |
| A. | 12 V |
| B. | 4.5 V |
| C. | 19.5 V |
| D. | 3 V |
| Answer» D. 3 V | |
| 64. |
If two ‘equal’ resistances are connected in parallel configuration, then the resultant resistance will be: |
| A. | Multiplication of both the resistances |
| B. | Half of the resistance value |
| C. | Double of the resistance value |
| D. | Zero |
| Answer» C. Double of the resistance value | |
| 65. |
A capacitor of 15 μF is charged by 400 V and is connected in parallel with another capacitor of 5 μF which is charged by 200 V. What will be the common voltage between them? |
| A. | 250 V |
| B. | 300 V |
| C. | 200 V |
| D. | 350 V |
| Answer» E. | |
| 66. |
If two capacitors having capacitance of 5 μF and 10 μF respectively are connected in series across a 200 V supply, find the potential difference across each capacitor. |
| A. | 50 V, 100 V |
| B. | 133.33 V, 66.66 V |
| C. | 200 V, 100 V |
| D. | 100 V, 200 V |
| Answer» C. 200 V, 100 V | |
| 67. |
Find the current i1 and voltage v2 in the given network. |
| A. | i1 = 1.5 A, v2 = -18V |
| B. | i1 = 1.5 A, v2 = 46V |
| C. | i1 = 5.5 A, v2 = 18V |
| D. | i1 = -1.5 A, v2 = 46V |
| Answer» C. i1 = 5.5 A, v2 = 18V | |
| 68. |
For the circuit shown in the figure below, the value of currents I1 and I2 is: |
| A. | 2.5 A, 1.5 A |
| B. | 3 A, 2.5 A |
| C. | 1 A, 1.5 A |
| D. | 1.5 A, 0.5 A |
| Answer» E. | |
| 69. |
Current in Ampere in an inductor is given by 10 + 10 t where t is the time in seconds. If the self- induced emf in the coil is 20 mV, then its self- inductance is: |
| A. | 10 mH |
| B. | 1 mH |
| C. | 2 mH |
| D. | 20 mH |
| Answer» D. 20 mH | |
| 70. |
Determine the currents x, y in the given network. |
| A. | \(x = \frac{{13}}{8}\;A,\;y = - \frac{3}{4}A\) |
| B. | \(x = - \frac{{13}}{8}A,\;y = - \frac{3}{4}A\) |
| C. | \(x = - \frac{{13}}{8}A,\;y = \frac{3}{4}A\) |
| D. | \(x = \frac{{13}}{8}\;A,\;y = \frac{3}{4}A\) |
| Answer» B. \(x = - \frac{{13}}{8}A,\;y = - \frac{3}{4}A\) | |
| 71. |
Find Req for the following circuit. |
| A. | 16 Ω |
| B. | 10 Ω |
| C. | 7.6 Ω |
| D. | 4 Ω |
| Answer» D. 4 Ω | |
| 72. |
Find the resistance R1 and R3 in the following circuits |
| A. | 4.11, 6.78 |
| B. | 4.11, 5.78 |
| C. | 7.23, 3.19 |
| D. | 5.09, 3.18 |
| Answer» E. | |
| 73. |
Find the values of v1 and v2 in the given circuit, if is = 25 mA, R1 = 4 Ω and R2 = 8 Ω |
| A. | v1 = 0.1 V and v2 = -0.2 V |
| B. | v1 = -0.1 V and v2 = 0.2 V |
| C. | v1 = 0.1 V and v2 = 0.2 V |
| D. | v1 = 0.2 V and v2 = 0.4 V |
| Answer» C. v1 = 0.1 V and v2 = 0.2 V | |
| 74. |
Find the voltage V0 across 4 Ω resistor in the following circuit. |
| A. | 20 V |
| B. | 12 V |
| C. | 24 V |
| D. | 18 V |
| Answer» D. 18 V | |
| 75. |
A voltage divider is to give an output voltage of 10 V from an input voltage of 30 V as shown in the figure. Given R2 = 100 Ω. The value of resistance R1 is: |
| A. | 150 Ω |
| B. | 200 Ω |
| C. | 100 Ω |
| D. | 300 Ω |
| Answer» C. 100 Ω | |
| 76. |
Express the power dissipated in a 100 Ω resistor in dB relative to 1 mW, when the voltage across the resistor is 1.0 Vrms |
| A. | 100 dB |
| B. | 20 dB |
| C. | 10 dB |
| D. | 1 dB |
| Answer» D. 1 dB | |
| 77. |
A network contains B branches and N nodes. The number of mesh current equations would be |
| A. | N – (B – 1) |
| B. | B – N – 1 |
| C. | (B + N) + 1 |
| D. | B – (N – 1) |
| Answer» E. | |
| 78. |
In source transformation of a circuit: |
| A. | voltage source is transformed in current source |
| B. | inductor is transformed in voltage source |
| C. | capacitor is transformed in resistor |
| D. | inductor is transformed in capacitor |
| Answer» B. inductor is transformed in voltage source | |
| 79. |
Find R, where all resistances are in Ohm and voltage across 500-ohm resistor is 2.5V. |
| A. | 50 Ω |
| B. | 25 Ω |
| C. | 233 Ω |
| D. | 230 Ω |
| Answer» D. 230 Ω | |
| 80. |
Form factor of sinusoidal ac signal is: |
| A. | 1.11 |
| B. | 0.11 |
| C. | 2.11 |
| D. | 3.11 |
| Answer» B. 0.11 | |
| 81. |
A balanced load of 5 + j4 is connected in delta. What is the impedance per phase of the equivalent star connection? |
| A. | 5 + j4 |
| B. | 1.66 + j1.33 |
| C. | 15 + j12 |
| D. | 2.5 + j2 |
| Answer» C. 15 + j12 | |
| 82. |
Ohm's law is applicable to |
| A. | DC circuit only |
| B. | AC circuit only |
| C. | DC circuit, as well as AC circuit provided account, is taken of the induced emf resulting from the self-inductance of the circuit and the distribution of current in cross-section of the circuit |
| D. | DC circuit as well as AC circuit provided account is taken of the induced emf resulting from mutual-inductance of the circuit and the distribution of current in cross-section of the circuit |
| Answer» E. | |
| 83. |
A battery having an open circuit voltage of 2 V has a terminal voltage of 1 V when supplying a current of 5 A. Its internal resistance is |
| A. | 0.6 Ω |
| B. | 0.4 Ω |
| C. | 0.2 Ω |
| D. | 0.1 Ω |
| Answer» D. 0.1 Ω | |
| 84. |
In the circuit shown below, the safe maximum value for the current I is _______ |
| A. | 10 A |
| B. | 0.5 A |
| C. | 0.1 A |
| D. | 0.05 A |
| Answer» D. 0.05 A | |
| 85. |
In the circuit shown below, how much is the power supplied by electric current I and the dependent source (voltage source)? |
| A. | 3 A, 90 W |
| B. | 3 A, 18 W |
| C. | 3 A, 54 W |
| D. | 3 A, 72 W |
| Answer» C. 3 A, 54 W | |
| 86. |
Obtain the relation between ia and im for the given network. |
| A. | im = -4ia |
| B. | im = 2ia |
| C. | im = 3ia |
| D. | im = -2ia |
| Answer» B. im = 2ia | |
| 87. |
For the network shown in figure, the value of supply current and source emf is: |
| A. | 4.5 A, 36 V |
| B. | 1.5 A, 27 V |
| C. | 4.5 A, 87 V |
| D. | 1.5 A, 36 V |
| Answer» D. 1.5 A, 36 V | |
| 88. |
If Current in a circuit is zero ampere, it is likely that |
| A. | Circuit is open |
| B. | Circuit is closed |
| C. | Resistance is too low |
| D. | Voltage is too high |
| Answer» B. Circuit is closed | |
| 89. |
Determine the external resistor required to reduce the line voltage from 120 V to 72 V for the operation of a device. The device is rated for 120 V, 100 W. |
| A. | 48 Ω |
| B. | 96 Ω |
| C. | 240 Ω |
| D. | 144 Ω |
| Answer» C. 240 Ω | |
| 90. |
I1, I2 and I3 in the figure below are mesh currents. The correct set of mesh equation for these currents, in matrix form, is _______ |
| A. | \(\left[ {\begin{array}{*{20}{c}} 3&{ - 1}&{ - 2}\\ { - 1}&3&{ - 1}\\ { - 2}&{ - 1}&3 \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{I_1}}\\ {{I_2}}\\ {{I_3}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{V_1}}\\ {{V_2}}\\ { - {V_3}} \end{array}} \right]\) |
| B. | \(\left[ {\begin{array}{*{20}{c}} 3&{ - 1}&{ - 2}\\ { - 1}&3&{ - 1}\\ { - 2}&{ - 1}&{ - 3} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{I_1}}\\ {{I_2}}\\ {{I_3}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{V_1}}\\ {{V_2}}\\ {{V_3}} \end{array}} \right]\) |
| C. | \(\left[ {\begin{array}{*{20}{c}} { - 3}&{ - 1}&{ - 2}\\ { - 1}&3&{ - 1}\\ { - 2}&{ - 1}&3 \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{I_1}}\\ {{I_2}}\\ {{I_3}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{V_1}}\\ {{V_2}}\\ { - {V_3}} \end{array}} \right]\) |
| D. | \(\left[ {\begin{array}{*{20}{c}} 1&{ - 1}&{ - 2}\\ { - 1}&3&{ - 1}\\ { - 2}&{ - 1}&3 \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{I_1}}\\ {{I_2}}\\ {{I_3}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{V_1}}\\ {{V_2}}\\ {{V_3}} \end{array}} \right]\) |
| Answer» B. \(\left[ {\begin{array}{*{20}{c}} 3&{ - 1}&{ - 2}\\ { - 1}&3&{ - 1}\\ { - 2}&{ - 1}&{ - 3} \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {{I_1}}\\ {{I_2}}\\ {{I_3}} \end{array}} \right] = \left[ {\begin{array}{*{20}{c}} {{V_1}}\\ {{V_2}}\\ {{V_3}} \end{array}} \right]\) | |
| 91. |
An iron-cored coil has an inductance of 4 H. If the reluctance of the flux path is 100 AT/Wb, then the number of turns in the coil is: |
| A. | 400 |
| B. | 200 |
| C. | 20 |
| D. | 40 |
| Answer» D. 40 | |
| 92. |
For the network shown in the figure, calculate the power developed by resistor R1 and R2 respectively. |
| A. | 160 W, 80 W |
| B. | 80 W, 160 W |
| C. | 140 W, 72 W |
| D. | 72 W, 144 W |
| Answer» E. | |
| 93. |
Kirchhoff's second law is based on law of conservation of |
| A. | charge |
| B. | energy |
| C. | momentum |
| D. | mass |
| Answer» C. momentum | |
| 94. |
One of the main applications of a Capacitance is to |
| A. | block ac and pass dc |
| B. | block both dc and ac |
| C. | block dc and pass ac |
| D. | pass both dc and ac |
| Answer» D. pass both dc and ac | |
| 95. |
For the circuit shown in the figure, the value of current 'I' is _______. |
| A. | 1 A |
| B. | 2 A |
| C. | 3 A |
| D. | Zero |
| Answer» B. 2 A | |
| 96. |
Find the value of current i1 in the following circuit. |
| A. | \(\frac{3}{4}A\) |
| B. | \(\frac{{ - 4}}{3}A\) |
| C. | 2 A |
| D. | \(\frac{4}{3}A\) |
| Answer» C. 2 A | |
| 97. |
A network N consists of resistors, independent voltage and current sources. The value of its determinant based on the loop analysis:1. cannot be negative2. cannot be zero3. is independent of the values of voltage and current sources4. dependent on the values of the resistances and the voltage and current sources |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1, 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» B. 1, 2 and 4 | |
| 98. |
For the networks shown below, what will be the resistance between the terminals A and B? |
| A. | 4 Ω |
| B. | 6 Ω |
| C. | 9 Ω |
| D. | 3 Ω |
| Answer» B. 6 Ω | |
| 99. |
Certain number of resistors having equal resistances offers an equivalent resistance of 1 Ω when connected in parallel and 100 Ω if they are connected in series. Then, the number of resistors and the resistance of each are ______. |
| A. | 20, 10 Ω |
| B. | 5, 20 Ω |
| C. | 20, 5 Ω |
| D. | 10, 10 Ω |
| Answer» E. | |
| 100. |
All the resistance in the circuit in the figure are at R ohms each. The switch is initially open. What happens to the intensity of the lamp when the switch is closed? |
| A. | increases |
| B. | remain same |
| C. | decreases |
| D. | answer depends on the value of R |
| Answer» C. decreases | |