MCQOPTIONS
Saved Bookmarks
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.
| 201. |
If the current through a coil having an inductance of 0.5 H is reduced from 5 A to 2 A in 0.05 s, calculate the mean value of the EMF induced in the coil. |
| A. | -15 V |
| B. | -30 V |
| C. | -60 V |
| D. | -10 V |
| Answer» C. -60 V | |
| 202. |
A group of delta connected capacitors delivers 90 MVAR. The same capacitors, when connect in star across the same source, would deliver. |
| A. | 10 MVAR |
| B. | 30 MVAR |
| C. | 90 MVAR |
| D. | 270 MVAR |
| Answer» C. 90 MVAR | |
| 203. |
Find RAB. |
| A. | 6 Ω |
| B. | 1 Ω |
| C. | 5 Ω |
| D. | 3 Ω |
| Answer» E. | |
| 204. |
No current flows through two charged bodies if they have equal: |
| A. | gain |
| B. | potential |
| C. | current |
| D. | capacity |
| Answer» C. current | |
| 205. |
A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL is |
| A. | 2.38 mW |
| B. | 2.38 W |
| C. | 238 mW |
| D. | 23.8 W |
| Answer» D. 23.8 W | |
| 206. |
Match List I with List II and select the correct answer using given optionsList-IList-IIA. Ohm’s law1. CapacitorsB. Fleming’s Right-Hand Rule2. GeneratorC. Alternator3. Voltage-current relationD. Coulomb’s Law4. AC generator |
| A. | A-2, B-3, C-4, D-1 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-2, B-4, C-3, D-1 |
| D. | A-3, B-2, C-4, D-1 |
| Answer» E. | |
| 207. |
Electrical appliances are not connected in series, because: |
| A. | Power loss is more |
| B. | Series circuit is complicated |
| C. | Appliances have different current rating |
| D. | None of these |
| Answer» D. None of these | |
| 208. |
One calorie heat energy is equal to the electrical energy of |
| A. | \( {10^{3} \over 86}\) kWh |
| B. | \( {10^{-4} \over 860}\) kWh |
| C. | \( {10^{-3} \over 8.6}\) kWh |
| D. | \( {10^{-3} \over 860}\) kWh |
| Answer» E. | |
| 209. |
Four resistors of equal value when connected in series across a supply dissipate 25 W. If the same resistors are now connected in parallel across the same supply, what is the power dissipated? |
| A. | 75 W |
| B. | 100 W |
| C. | 200 W |
| D. | 400 W |
| Answer» E. | |
| 210. |
A balanced 3-phase, 3-wire supply feeds balanced star connected resistors. If one of the resistors is disconnected, then the percentage reduction in load will be |
| A. | 33.33 |
| B. | 50 |
| C. | 66.67 |
| D. | 75 |
| Answer» C. 66.67 | |
| 211. |
A coil of 0.5 H carries a current of 1 A. If the current is reversed in 1 millisecond, emf induced in the coil is |
| A. | 500 V |
| B. | 100 V |
| C. | 1000 V |
| D. | 5000 V |
| Answer» D. 5000 V | |
| 212. |
Capacitance of a Capacitor |
| A. | Increases with increase in overlapping area of plates |
| B. | Increases with increase in relative permittivity of the dielectric |
| C. | Increase with decreases in distance between the plates |
| D. | All of these |
| Answer» E. | |
| 213. |
A substance with a minimum value of _______ is the best conductor. |
| A. | Permittivity |
| B. | Conductivity |
| C. | Temperature coefficient of resistance |
| D. | Resistivity |
| Answer» E. | |
| 214. |
Kirchhoff’s law is applicable to: |
| A. | Passive networks only |
| B. | AC networks only |
| C. | DC networks only |
| D. | Both AC and DC circuits |
| Answer» E. | |
| 215. |
At 300 K, the temperature coefficient of resistance of a wire is 0.00125 / °C and its resistance is 1 Ω. What will be its resistance at 1100 K? |
| A. | 5.1225 Ω |
| B. | 3 Ω |
| C. | 6.125 Ω |
| D. | 2 Ω |
| Answer» E. | |
| 216. |
A battery of 24 V is applied across terminals AB of the circuit as shown in the figure. Current in the 2-ohm resistor will be |
| A. | 3 A |
| B. | 6 A |
| C. | 2.5 A |
| D. | 1.5 A |
| Answer» E. | |
| 217. |
Out of the three bulbs of 25 W, 40 W, and 60 W, which one will have the lowest resistance? |
| A. | 40 W bulb |
| B. | 60 W bulb |
| C. | Both 25 W and 60 W bulbs |
| D. | 25 W bulb |
| Answer» C. Both 25 W and 60 W bulbs | |
| 218. |
Current equals |
| A. | Coulombs/Time |
| B. | Coulombs × Time |
| C. | Voltage/Time |
| D. | Voltage × Time |
| Answer» B. Coulombs × Time | |
| 219. |
For a given electrical circuit, determine the value of R, such that NO power is dissipated across the 2 Ω resistor. |
| A. | 1 Ω |
| B. | 3 Ω |
| C. | 4 Ω |
| D. | 2 Ω |
| Answer» C. 4 Ω | |
| 220. |
Leakage factor in magnetic circuit is defined as: |
| A. | total flux + useful flux |
| B. | total flux × useful flux |
| C. | useful flux / total flux |
| D. | total flux / useful flux |
| Answer» E. | |
| 221. |
A current of 2.0 A passes through a cell of e.m.f. 1.5 V having internal resistance of 0.15 Ω. The potential difference across the terminals of the cell is |
| A. | 1.35 V |
| B. | 1.50 V |
| C. | 1.00 V |
| D. | 1.20 V |
| Answer» E. | |
| 222. |
Find the current flowing through resistor R2? |
| A. | 5 A |
| B. | 2 A |
| C. | 1.51 A |
| D. | 1.25 A |
| Answer» D. 1.25 A | |
| 223. |
A waveform shown in the figure is applied to a resistor of 20 Ω. The power dissipated in the resistor is |
| A. | 100 W |
| B. | 600 W |
| C. | 900 W |
| D. | 1000 W |
| Answer» E. | |
| 224. |
An electric kettle contains 1.5 kg of water at 15°C. It takes 15 minutes to raise the temperature of water to 95°C. If the heat loss due to radiations and heating the kettle is 15 kcalories and the supply voltage is 100 V, the current taken will be |
| A. | 8.0 A |
| B. | 7.1 A |
| C. | 6.3 A |
| D. | 5.4 A |
| Answer» D. 5.4 A | |
| 225. |
A conductor of diameter d, length l consumes a power of W when a current I flows through it. What will be the power consumed if d is doubled, l is halved and current is tripled? |
| A. | 9/8 W |
| B. | 36 W |
| C. | 48 W |
| D. | 72 W |
| Answer» B. 36 W | |
| 226. |
Determine the resistance of a 1 km strip of copper of rectangular cross-section 2.5 cm by 0.05 cm. Assume ρ is the resistivity of the copper. |
| A. | 80 × ρ M Ω |
| B. | 80 × ρ m Ω |
| C. | 80 × ρ Ω |
| D. | 8 × ρ M Ω |
| Answer» B. 80 × ρ m Ω | |
| 227. |
Ohm's Law is followed by: |
| A. | Metal rectifier |
| B. | Copper electrode |
| C. | Crystal detector |
| D. | Arc lamp |
| Answer» C. Crystal detector | |
| 228. |
In the given circuit, find the current in the 12 Ω resistor. |
| A. | 0.5 A |
| B. | 1.5 A |
| C. | 2 A |
| D. | 1 A |
| Answer» B. 1.5 A | |
| 229. |
A point where two or more branches connect is called as ___________. |
| A. | branch |
| B. | node |
| C. | terminal |
| D. | circuit |
| Answer» C. terminal | |
| 230. |
In a parallel circuit the potential difference across the resistance ________. |
| A. | Varies |
| B. | Is different from the applied voltage |
| C. | None of the these |
| D. | Is always constant |
| Answer» E. | |
| 231. |
In order to replace internal resistance, the ideal current source is replaced by: |
| A. | voltage source |
| B. | capacitor |
| C. | open circuit |
| D. | short circuit |
| Answer» D. short circuit | |
| 232. |
A 25 W, 220 V bulb and a 100 W, 220 V bulb are connected in parallel and connected to a 220 V supply. Which bulb will produce more light? |
| A. | The voltage is not sufficient to produce light by the bulb |
| B. | 25 W bulb |
| C. | Both bulbs will produce uniform light |
| D. | 100 W bulb |
| Answer» E. | |
| 233. |
For the circuit given below, the current through 8 Ω is: |
| A. | 2.5 A |
| B. | 4 A |
| C. | 1 A |
| D. | 1.42 A |
| Answer» E. | |
| 234. |
Determine the voltage (in V) across 40 Ohms resistor for the given circuit diagram. |
| A. | 20 |
| B. | 30 |
| C. | 15 |
| D. | 10 |
| Answer» C. 15 | |
| 235. |
A network has 12 branches and 8 independent loops. How many nodes are there in the network? |
| A. | 19 |
| B. | 17 |
| C. | 5 |
| D. | 4 |
| Answer» D. 4 | |
| 236. |
For the given network, find the value of the resistance R. |
| A. | 0.1 Ω |
| B. | 2.5 Ω |
| C. | 10 Ω |
| D. | 25 Ω |
| Answer» D. 25 Ω | |
| 237. |
Ohm’s law is valid for |
| A. | all conductor |
| B. | all nonlinear devices |
| C. | all temperature |
| D. | all metals |
| Answer» B. all nonlinear devices | |
| 238. |
Find the power absorbed by the current-controlled current source (CCCS) in the given network. |
| A. | -115.2 W |
| B. | 115.2 W |
| C. | -24 W |
| D. | 24 W |
| Answer» B. 115.2 W | |
| 239. |
As shown in the figure, when the Network N is inserted between the load and source, the insertion loss is:(log10 2.5252 = 0.4022) |
| A. | 8.046 dB |
| B. | 2.5252 dB |
| C. | 25.2 dB |
| D. | 4.022 dB |
| Answer» B. 2.5252 dB | |
| 240. |
Equivalent resistance between X and Y |
| A. | 75 Ohm |
| B. | 50 Ohm |
| C. | 275 Ohm |
| D. | None of the above |
| Answer» B. 50 Ohm | |
| 241. |
A student was asked to connect 10 cells of 1.5 V in series to make a battery of 15 V. If one cell was connected in reverse by mistake, what will be the battery voltage? |
| A. | 15 V |
| B. | 13.5 V |
| C. | 12 V |
| D. | 16.5 V |
| Answer» D. 16.5 V | |
| 242. |
At 0 °C, a sample of copper has a resistance of 4 mΩ and its temperature coefficient of resistance is 1/234.5 per °C. Find the value of the temperature coefficient of its resistance at 70 °C. |
| A. | 0.003284 per °C |
| B. | 0.003434 per °C |
| C. | 0.003248 per °C |
| D. | 0.003428 per °C |
| Answer» B. 0.003434 per °C | |
| 243. |
A unilateral transistor has an output impedance Zout = (10 – j10) Ω. Value of the series and shunt components of the matching network for complex conjugate match at the output of the device to 50 Ω load are: |
| A. | X1 = -j25, X2 = +j30 |
| B. | X1 = +j25, X2 = +j30 |
| C. | X1 = -j25, X2 = -j3 |
| D. | X1 = +j2, X2 = -j30 |
| Answer» B. X1 = +j25, X2 = +j30 | |
| 244. |
A capacitor stores 1 coulomb at 10 volts. Its capacitance is (f = farad): |
| A. | 1 F |
| B. | 10 F |
| C. | 0.1 F |
| D. | 0.01 F |
| Answer» D. 0.01 F | |
| 245. |
A linear circuit is one whose parameters: |
| A. | None of the options |
| B. | Change with change in current |
| C. | Change with change in voltage |
| D. | Do not change with voltage and current |
| Answer» E. | |
| 246. |
A nichrome wire used as a heater coil the resistance of 1 ohm/metre. For a heater of 1000 W at 200 V, the length of wire required will be |
| A. | 5 m |
| B. | 20 m |
| C. | 40 m |
| D. | 50 m |
| Answer» D. 50 m | |
| 247. |
If 2.2 m long conductor has a cross sectional area of 0.025 m2 and resistance of 5 ohms, find its resistivity: |
| A. | 0.072 ohm m |
| B. | 0.057 ohm m |
| C. | 0.58 ohm m |
| D. | 0.67 ohm m |
| Answer» C. 0.58 ohm m | |
| 248. |
In a long uniform coil of inductance 2L and associated resistance 2R ohms is physically cut in to two exact halves which are rewound in parallel. The resistance and inductance of the combination are. |
| A. | R and L |
| B. | 2R and 2L |
| C. | R/2 and L/2 |
| D. | R/4 and L/4 |
| Answer» D. R/4 and L/4 | |
| 249. |
If 10 lamps are connected in series across a power supply, then determine the voltage of the supply when it is given that the voltage across each lamp is 6.0 V |
| A. | 60 V |
| B. | 20 V |
| C. | 35 V |
| D. | 42 V |
| Answer» B. 20 V | |
| 250. |
Find the odd one out regarding Ohm's Law. |
| A. | Vacuum tubes |
| B. | Conductor |
| C. | DC circuit |
| D. | High Voltage Circuit |
| Answer» B. Conductor | |