MCQOPTIONS
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MCQOPTIONS
This section includes 439 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Calculate the value of maximum safe current (in A) that can flow in a 50 Ohms, 4 W resistor. |
| A. | 0.28 |
| B. | 1.28 |
| C. | 2.28 |
| D. | 3.28 |
| Answer» B. 1.28 | |
| 152. |
Determine the current flowing through the 7-Ω and 3-Ω resistors, respectively, in the following circuit. |
| A. | 5 A and 4.8 A |
| B. | 10.56 A and 24.65 A |
| C. | 11.254 A and 9.582 A |
| D. | 2 A and 4 A |
| Answer» C. 11.254 A and 9.582 A | |
| 153. |
In the diagram below, what is the current in the 1 Ω resistor? |
| A. | 4.12 A |
| B. | 3 A |
| C. | 1 A |
| D. | 4 A |
| Answer» C. 1 A | |
| 154. |
A good current buffer has |
| A. | low input impedance and low output impedance |
| B. | low input impedance and high output impedance |
| C. | high input impedance and low output impedance |
| D. | high input impedance and high output impedance |
| Answer» C. high input impedance and low output impedance | |
| 155. |
Convert the given circuit into its equivalent delta circuit. |
| A. | RAC = 22 Ω, RBC = 11 Ω, RAB = 7.33 Ω |
| B. | RAC = 11 Ω, RBC = 12 Ω, RAB = 6 Ω |
| C. | RAC = 10 Ω, RBC = 8 Ω, RAB = 6 Ω |
| D. | RAC = 11 Ω, RBC = 22 Ω, RAB = 7.33 Ω |
| Answer» E. | |
| 156. |
In a R-L-C series circuit, R = 10 Ω, L = 1 H and C = 1 μF. It is connected to 230 V a.c. source of variable frequency. When the frequency is set to zero, circuit current will be |
| A. | 23 A |
| B. | 11.5 A |
| C. | 46 A |
| D. | zero |
| Answer» E. | |
| 157. |
How much energy does a 100-W electric bulb consume in two hours? |
| A. | 7200 J |
| B. | 720 J |
| C. | 720 kJ |
| D. | 72 kJ |
| Answer» D. 72 kJ | |
| 158. |
Based on the property of conductivity, select the odd one from the following.Eureka, synthetic resin, specific anti-thermal glass (pyrex), pressboard |
| A. | pressboard |
| B. | Eureka |
| C. | Special anti-thermal glass (Pyrex) |
| D. | Artificial resin |
| Answer» C. Special anti-thermal glass (Pyrex) | |
| 159. |
Find the power developed by the current source. |
| A. | 3 W |
| B. | 2 W |
| C. | 4 W |
| D. | 1 W |
| Answer» B. 2 W | |
| 160. |
In the following circuit, what is the voltage drop across the 1.5 Ω resistor? |
| A. | 2.25 V |
| B. | 2.5 V |
| C. | 1.5 V |
| D. | 2 V |
| Answer» B. 2.5 V | |
| 161. |
Analyze the following diagram and find the electric current in the 8 Ω resistor. |
| A. | 1.895 A |
| B. | 1.632 A |
| C. | 2.434 A |
| D. | 0.263 A |
| Answer» C. 2.434 A | |
| 162. |
Find the electric current in the series combination of 8 Ω and 4 Ω resistors in the following circuit. |
| A. | 0.75 A |
| B. | 0.25 A |
| C. | 0.5 A |
| D. | 1 A |
| Answer» D. 1 A | |
| 163. |
Potential difference is measured in ___________. |
| A. | Watt |
| B. | Joule |
| C. | Volts |
| D. | Ampere |
| Answer» D. Ampere | |
| 164. |
Obtain the equivalent resistance of three 60 Ω resistors in parallel. |
| A. | 10Ω |
| B. | 30 Ω |
| C. | 20 Ω |
| D. | 180 Ω |
| Answer» D. 180 Ω | |
| 165. |
Determine the resistance (in Ohms) of resistor when the potential difference between the ends of the resistor is 24 V and the current flowing through the resistor is 3 A. |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 4 |
| Answer» D. 4 | |
| 166. |
If all the three resistances of a given DELTA network are 15 Ω each, then three resistances of the equivalent star will be |
| A. | 45 Ω each |
| B. | 30 Ω each |
| C. | 15 Ω each |
| D. | 5 Ω each |
| Answer» E. | |
| 167. |
In the following circuit, determine the current l1 by using mesh analysis. |
| A. | 3.52 A |
| B. | 6.6 A |
| C. | 6.3 A |
| D. | 1.71 A |
| Answer» E. | |
| 168. |
An ideal current source has zero |
| A. | Internal conductance |
| B. | Internal resistance |
| C. | Voltage on no load |
| D. | Ripple |
| Answer» B. Internal resistance | |
| 169. |
Assertion (A): Shot noise is due to random variations in current flow in active devices.Reason (R): Current is a flow of carriers each of which carries a finite amount of charge. |
| A. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| B. | Both (A) and (R) are true, but (R) is not the correct explanation of (A) |
| C. | (A) is true, but (R) is false |
| D. | (A) is false, but (R) is true |
| Answer» B. Both (A) and (R) are true, but (R) is not the correct explanation of (A) | |
| 170. |
An electric bulb of 100 W is connected to a 250 V alternating current (AC) supply. How much current is there in the circuit? |
| A. | 0.3 A |
| B. | 0.6 A |
| C. | 0.4 A |
| D. | 4 A |
| Answer» D. 4 A | |
| 171. |
In the given circuit, which of the following options does NOT hold true? |
| A. | \(I_{total}=I_1+I_2+I_3\) |
| B. | \(\dfrac{1}{V_{\left(s\right)}}=\dfrac{1}{V_1}+\dfrac{1}{V_2}+\dfrac{1}{V_3}\) |
| C. | \(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\) |
| D. | VS = V1 = V2 = V3 |
| Answer» C. \(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\) | |
| 172. |
A capacitor can be represented by a capacitance and a resistance in parallel. For a good capacitor, this parallel resistance is ________. |
| A. | Very high |
| B. | Very low |
| C. | Low |
| D. | None of these |
| Answer» B. Very low | |
| 173. |
An air-cored soleniod of 250 turns has a cross-sectional area A = 80 cm2 and length l = 100 cm. The value of its inductance is |
| A. | 0.425 mH |
| B. | 0.628 mH |
| C. | 0.751 mH |
| D. | 0.904 mH |
| Answer» C. 0.751 mH | |
| 174. |
Permittivity is expressed in ____________. |
| A. | Farad |
| B. | Farad/mm |
| C. | Farad/m |
| D. | Farad/mm2 |
| Answer» D. Farad/mm2 | |
| 175. |
A benchtop dc power supply acts as an ideal 4 A current source as long as its terminal voltage is below 10 V. Beyond this point, it begins to behave as an ideal 10 V voltage source for all load currents going down to 0 A. When connected to an ideal rheostat, find the load resistance value at which maximum power is transferred, and the corresponding load voltage and current. |
| A. | Short, ∞ A, 10 V |
| B. | Open, 4 A, 0 V |
| C. | 2.5 Ω, 4 A, 10 V |
| D. | 2.5 Ω, 4 A, 5 V |
| Answer» D. 2.5 Ω, 4 A, 5 V | |
| 176. |
A nichrome wire used as a coil in a heater has a resistance of 2 Ω/m. What will be the length of wire required for a 1 kW heater at 200 V? |
| A. | 80 m |
| B. | 40 m |
| C. | 20 m |
| D. | 24 m |
| Answer» D. 24 m | |
| 177. |
______ is the rate of energy consumed or supplied by an electrical component in reference to time. |
| A. | Voltage |
| B. | Power |
| C. | Current |
| D. | Frequency |
| Answer» C. Current | |
| 178. |
In the network shown in the given figure, find the current through R3. |
| A. | 5 A |
| B. | 2 A |
| C. | 3 A |
| D. | 1 A |
| Answer» E. | |
| 179. |
Ohm's law does not apply: |
| A. | on high voltage circuits |
| B. | on carbon resistors |
| C. | At low-density circuits of electric current |
| D. | on vacuum tubes |
| Answer» E. | |
| 180. |
In the given circuit, the mesh currents I1, I2 and I3 are |
| A. | I1 = 1 A, I2 = 2 A and I3 = 3 A |
| B. | I1 = 2 A, I2 = 3 A and I3 = 4 A |
| C. | I1 = 3 A, I2 = 4 A and I3 = 5 A |
| D. | I1 = 4 A, I2 = 5 A and I3 = 6 A |
| Answer» B. I1 = 2 A, I2 = 3 A and I3 = 4 A | |
| 181. |
For the circuit given below, current through 1 Ω resistance is: |
| A. | 1.14 A |
| B. | 2 A |
| C. | 1.43 A |
| D. | 1.67 A |
| Answer» D. 1.67 A | |
| 182. |
In the circuit shown, what is the voltage V across the 10 Ω resistor? |
| A. | 6.67 V |
| B. | 10.03 V |
| C. | 16.7 V |
| D. | 23.34 V |
| Answer» E. | |
| 183. |
An ideal constant current source is connected in series with an ideal constant voltage source. Considering both together, the combination will give______. |
| A. | Constant voltage source |
| B. | Constant current source |
| C. | Constant power source |
| D. | None of the above |
| Answer» C. Constant power source | |
| 184. |
How will the total capacitance change, when two capacitors are connected in parallel? |
| A. | The total capacitance increases |
| B. | The total capacitance decreases |
| C. | The mean value gives the new capacitance |
| D. | The total capacitance is found by reciprocal equation |
| Answer» B. The total capacitance decreases | |
| 185. |
Ideal current source have |
| A. | Zero internal resistance |
| B. | Infinite internal resistance |
| C. | Low value of voltage |
| D. | Large value of current |
| Answer» C. Low value of voltage | |
| 186. |
A 12 Ω resistor is connected in parallel with a 6 Ω resistor. What will be the equivalent resistance? |
| A. | 6 Ω |
| B. | 4 Ω |
| C. | 18 Ω |
| D. | 12 Ω |
| Answer» C. 18 Ω | |
| 187. |
Find the electric current at 4 Ω resistor. |
| A. | 1.632 A |
| B. | 1.895 A |
| C. | 0.263 A |
| D. | 2.434 A |
| Answer» D. 2.434 A | |
| 188. |
At 0° C, a copper sample has a resistance of 4 mΩ and its resistance has a temperature coefficient of 1/234.5 per °C. Find its resistance at 70 °C. |
| A. | 4.52 mΩ |
| B. | 5.19 mΩ |
| C. | 4.22 mΩ |
| D. | 5.55 mΩ |
| Answer» C. 4.22 mΩ | |
| 189. |
A capacitor consists of two conducting surfaces separated by a/an ________. |
| A. | semiconductor |
| B. | alloy |
| C. | metal |
| D. | insulator |
| Answer» E. | |
| 190. |
A 4-ohm resistor is connected in a circuit containing 4 V supply. The current drawn is |
| A. | 8 A |
| B. | 4 A |
| C. | 1 A |
| D. | 16 A |
| Answer» D. 16 A | |
| 191. |
A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to _____. |
| A. | ohmic loss due to ohmic resistance of plates |
| B. | loss of energy in dielectric |
| C. | capacitive reactance in ohms |
| D. | Both ohmic loss due to ohmic resistance of plates and loss of energy in the dielectric |
| Answer» E. | |
| 192. |
Determine the potential difference (in V) between nodes B and D. |
| A. | -5 |
| B. | 5 |
| C. | -6 |
| D. | 6 |
| Answer» D. 6 | |
| 193. |
A delta connection of 1 ohm in each branch is converted into star connection. This star connection will have value in each branch: |
| A. | 1/3 ohm |
| B. | 2/3 ohm |
| C. | 1 ohm |
| D. | 3 ohm |
| Answer» B. 2/3 ohm | |
| 194. |
For the given circuit, the current through 3 Ω resistance is: |
| A. | 2 A |
| B. | 3.5 A |
| C. | 1.7 A |
| D. | 3 A |
| Answer» B. 3.5 A | |
| 195. |
A capacitor stores energy in |
| A. | Dielectric dipole |
| B. | A magnetic field |
| C. | An electromagnetic field |
| D. | All the above |
| Answer» B. A magnetic field | |
| 196. |
A quantity which changes its polarity at regular intervals of time is called: |
| A. | an alternating quantity |
| B. | DC quantity |
| C. | non-periodic quantity |
| D. | time independent quantity |
| Answer» B. DC quantity | |
| 197. |
A capacitor of 100 μF stores 10 mJ of energy. What is the amount of charge (in coulomb) stored in it? |
| A. | 1.414 × 10-6 |
| B. | 1.414 × 10-3 |
| C. | 2.303 × 10-6 |
| D. | 2.303 × 10-3 |
| Answer» C. 2.303 × 10-6 | |
| 198. |
One kilowatt-hour of electrical energy is the same as: |
| A. | 36 × 105 watt |
| B. | 36 × 105 ergs |
| C. | 36 × 105 joules |
| D. | 36 × 105 B.T.U. |
| Answer» D. 36 × 105 B.T.U. | |
| 199. |
1 kcal is approximately equal to ______. |
| A. | 4200 wat-sec |
| B. | 420 joules |
| C. | 4.2 joules |
| D. | 420 watt-hour |
| Answer» B. 420 joules | |
| 200. |
Determine the heat dissipated (in Joule) through a conductor of 10 ohms resistance, when 1 A of current is flowing through the conductor for 5 seconds. |
| A. | 50 |
| B. | 40 |
| C. | 20 |
| D. | 60 |
| Answer» B. 40 | |