MCQOPTIONS
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MCQOPTIONS
This section includes 1800 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
Maximum power transfer theorem finds application in |
| A. | power circuits |
| B. | distribution circuits |
| C. | communication circuits |
| D. | both power and communication circuits |
| Answer» D. both power and communication circuits | |
| 1252. |
For a series R-L-C circuit tuned at resonant frequency which of the following statements is correct? |
| A. | The voltage across inductance is greater than applied voltage |
| B. | The voltage across capacitance is greater than applied voltage |
| C. | The voltage across both inductance and capacitance is greater than applied voltage |
| D. | The voltage across both inductance and capacitance is less than applied voltage |
| Answer» D. The voltage across both inductance and capacitance is less than applied voltage | |
| 1253. |
Figure shows an RC circuit. The magnitude plot V2/V1 |
| A. | will rise exponentially to R2/(R1 + R2) as ω → ∞ |
| B. | will rise linearly to R2/(R1 + R2) as ω → ∞ |
| C. | will decrease to zero as ω → ∞ |
| D. | will rise 1 at ω = 0 and then decrease as ω → ∞ |
| Answer» B. will rise linearly to R2/(R1 + R2) as œâ ‚Üí ‚àû | |
| 1254. |
The equation where v1, v2 ... vb are the instantaneous branch voltages and i1, i2 ... ib are the instantaneous branch currents pertains to |
| A. | Compensation theorem |
| B. | Bisectional theorem |
| C. | Tellegen's theorem |
| D. | Reciprocity theorem |
| Answer» D. Reciprocity theorem | |
| 1255. |
For a two- port reciprocal network, the output open circuit voltage divided by the input current is equal to |
| A. | B |
| B. | Z12 |
| C. | 1/y12 |
| D. | h12 |
| Answer» C. 1/y12 | |
| 1256. |
The circuit of figure is generally employed as a |
| A. | bridge |
| B. | low-pass filter |
| C. | peaking network |
| D. | high-pass filter |
| Answer» C. peaking network | |
| 1257. |
In all pure metals, temperature coefficient of resistance is positive. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1258. |
The capacitance of a parallel plate capacitor varies as per the equation C(t) = C0 (1 - cos ωt). It is connected to a battery of V volts. The equation for current is |
| A. | ωC0V (1 - cos ωt) |
| B. | ωC0V(1 - sin ωt) |
| C. | ωC0V (1 - sin 2ωt) |
| D. | ωC0V sin ωt |
| Answer» E. | |
| 1259. |
The resonance frequency of the circuit is |
| A. | 5.4 Kn2 |
| B. | 4.5 Kn2 |
| C. | 5 Kn2 |
| D. | ‚àû |
| Answer» C. 5 Kn2 | |
| 1260. |
In a series RLC circuit the phase angle θ of impedance Z ∠θ is positive. The circuit will behave as |
| A. | resistive circuit |
| B. | RC circuit |
| C. | RL circuit |
| D. | either RL or RC circuit |
| Answer» C. RL circuit | |
| 1261. |
The equivalent circuit of a resistor is shown in the given figure. The resistor will be non-inductive if |
| A. | |
| B. | |
| Answer» C. | |
| 1262. |
For a flexible cable, most suitable insulation is |
| A. | magnesium oxide |
| B. | glass fibre |
| C. | insulating tape |
| D. | polyvinyl chloride |
| Answer» E. | |
| 1263. |
Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is |
| A. | 1.67 |
| B. | 0.6 |
| C. | 0.36 |
| D. | 0.216 |
| Answer» C. 0.36 | |
| 1264. |
In figure, VAB = |
| A. | 6 V |
| B. | 10 V |
| C. | 25 V |
| D. | 40 V |
| Answer» E. | |
| 1265. |
A two port network is reciprocal if and only if |
| A. | Z11 = Z22 |
| B. | BC - AD = - 1 |
| C. | Y12 = Y21 |
| D. | h12 = h21 |
| Answer» C. Y12 = Y21 | |
| 1266. |
If current is less than 20 mA and time of contact is very small, the effect of current on human body is likely to be temporary. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1267. |
In drawing phasor diagram |
| A. | rms values are used |
| B. | peak values are used |
| C. | either rms or peak values are used |
| D. | either rms or peak or averages values are used |
| Answer» B. peak values are used | |
| 1268. |
The dependent current source shown in given figure. |
| A. | delivers 80W |
| B. | absorbs 80W |
| C. | deliver 40W |
| D. | absorbs 40W |
| Answer» C. deliver 40W | |
| 1269. |
A bulb rated at 60 W, 120 V is used for 30 minutes. The charge associated with this operation is |
| A. | 3600 C |
| B. | 900 C |
| C. | 7200 C |
| D. | 600 C |
| Answer» C. 7200 C | |
| 1270. |
The transfer function G12 (s) for a two port is |
| A. | V2/V1 |
| B. | V2 (s)/V1 (s) |
| C. | V2 (s)/I1 (s) |
| D. | I2 (s)/I1 (s) |
| Answer» C. V2 (s)/I1 (s) | |
| 1271. |
A parallel RLC circuit has ω0 = 106 and Q = 30, Given C = 30 pF, the value of R is |
| A. | 0 |
| B. | 1 μΩ |
| C. | 2 MΩ |
| D. | 1 MΩ |
| Answer» E. | |
| 1272. |
A current increasing at the rate of 1A/s is passed through a 1 H inductor. At t = 0, i = 0. The flux linkages after 1 sec are |
| A. | 0.5 Wb-turn |
| B. | 1 Wb-turn |
| C. | 2 Wb-turn |
| D. | 4 Wb-turn |
| Answer» E. | |
| 1273. |
In figure, the time constant for the capacitor charging is |
| A. | 6 μs |
| B. | 10 μs |
| C. | 15 μs |
| D. | 25 μs |
| Answer» B. 10 Œºs | |
| 1274. |
Consider the following: Energy storage capability of basic passive elements is due to the fact thatresistance dissipates energycapacitance stores energyinductance dissipates energy Which of the above is/are correct? |
| A. | 1, 2, and 3 |
| B. | 1 and 3 |
| C. | 3 only |
| D. | 1 and 2 |
| Answer» E. | |
| 1275. |
Assertion (A): In a parallel circuit having two branches, each branch current may be more than source current.Reason (R): Calculations in ac circuits use rules of complex algebra. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and 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» C. A is true but R is false | |
| 1276. |
At resonance the network function magnitude will be |
| A. | k/a |
| B. | k/b |
| C. | c |
| D. | k/a + b |
| Answer» B. k/b | |
| 1277. |
The time constant of the circuit in figure is |
| A. | 6 sec |
| B. | 10 sec |
| C. | |
| Answer» D. | |
| 1278. |
Figure shows a dc circuit fed by a current source. With respect to terminals AB, Thevenin's voltage and Thevenin's resistance are |
| A. | VTH = 5 V, RTH = 0.75 Ω |
| B. | VTH = 2.5 V, RTH = 0.75 Ω |
| C. | VTH = 2.5 V, RTH = 1 Ω |
| D. | VTH = 5 V, RTH = 1 Ω |
| Answer» C. VTH = 2.5 V, RTH = 1 Œ© | |
| 1279. |
The VTH at terminals A and B is equal to |
| A. | 0 V |
| B. | 5 V |
| C. | -5 V |
| D. | none |
| Answer» C. -5 V | |
| 1280. |
An RLC series circuit is excited by 200 V, 100 Hz supply. The current is 20 A. If R = 10 Ω, XL = 50 Ω, XC is |
| A. | 10 Ω |
| B. | 14.14 Ω |
| C. | 7.07 Ω |
| D. | 50 Ω |
| Answer» E. | |
| 1281. |
In figure, i(t) is a unit step current. The steady state value of v(t) is |
| A. | 2 V |
| B. | 3 V |
| C. | 6 V |
| D. | 9 V |
| Answer» B. 3 V | |
| 1282. |
A constant k high pass p section has a characteristic impedance of 300 Ω at f = ∞ . At f = fc, the characteristic impedance will be |
| A. | zero |
| B. | ‚àû |
| C. | 300 Ω |
| D. | more than 300 Ω |
| Answer» C. 300 Œ© | |
| 1283. |
A parallel RLC circuit with R1 = 20, is scaled giving R2 = 104, L2 = 10-4 and C2, the value of C2 is |
| A. | 0.10 nF |
| B. | 0.3 nF |
| C. | 0.2 nF |
| D. | 0.4 nF |
| Answer» D. 0.4 nF | |
| 1284. |
Assertion (A): Superposition theorem can be used to find the output of a full wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.Reason (R): Superposition theorem is valid for all linear systems. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and 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» E. | |
| 1285. |
In a composite filter terminating half sections are used for impedance matching. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1286. |
A reactance function is always a quotient of |
| A. | even to odd polynomials |
| B. | odd to even polynomials |
| C. | even to odd or odd to even polynomials |
| D. | even to even polynomials |
| Answer» B. odd to even polynomials | |
| 1287. |
In figure, the tree branches are bdf. The fundamental loops include |
| A. | abc, def, bdea |
| B. | cea, bdea, abc |
| C. | cdb, def, bfa |
| D. | abde, def, cdb |
| Answer» D. abde, def, cdb | |
| 1288. |
Identify which of the following is not a tree of the graph shown in figure |
| A. | bcgh |
| B. | defg |
| C. | abfg |
| D. | aegh |
| Answer» D. aegh | |
| 1289. |
In the circuit shown in the given figure, power dissipated in the 5 Ω resistor is |
| A. | zero |
| B. | 80 W |
| C. | 125 W |
| D. | 405 W |
| Answer» E. | |
| 1290. |
Assertion (A): A complicated waveform can be replaced by sum or difference of two or more waveforms.Reason (R): The method of superposition is applicable only to linear systems. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and 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 and R is not the correct explanation of A | |
| 1291. |
In the circuit of figure, the current through battery E3 is |
| A. | 4 A charging |
| B. | 4 A discharging |
| C. | 4 A charging or discharging depending on value of E3 |
| D. | 4 A charging or discharging depending on values of E1, E2, E3 |
| Answer» B. 4 A discharging | |
| 1292. |
The final value of is |
| A. | ‚àû |
| B. | 2 |
| C. | 1 |
| D. | zero |
| Answer» D. zero | |
| 1293. |
A series LCR circuit consisting of R = 20 Ω, | XL | = 20 Ω and | XC | = 20 Ω, connected across an A.C. supply of 200 V rms. The rms voltage across the capacitor is |
| A. | 100 ∠ 45 |
| B. | 400 ∠ -90° |
| C. | 400 ∠ +90° |
| D. | 100 ∠ -45 |
| Answer» C. 400 ‚à† +90¬∞ | |
| 1294. |
If a two port network is represented by an equivalent T network the admittance of series arm in term of ABCD parameter is equal to |
| A. | C |
| B. | 1/C |
| C. | (A - 1)/B |
| D. | 1/B |
| Answer» E. | |
| 1295. |
A capacitor whose capacitance Ct = C0 (1- cos ωt) is fed by a sinusoidal voltage v = V0 sin ωt. The equation for current i is |
| A. | ω C0V0 cos ωt |
| B. | ω C0V0 sin ωt |
| C. | ω C0V0 (cos ωt - cos2 ωt) |
| D. | none of the above |
| Answer» D. none of the above | |
| 1296. |
In a passive band pass filter, the resonant frequencies of series and shunt arms are equal. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1297. |
For an RC admittance function Y, |
| A. | Y(‚àû) < Y(0) |
| B. | Y(0) < Y(‚àû) |
| C. | Y (‚àû) may be lesser or greater than Y(0) |
| D. | Y(‚àû) = Y(0) |
| Answer» C. Y (‚àû) may be lesser or greater than Y(0) | |
| 1298. |
A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through the short circuit. If the short circuit is removed and a resistance of 1.5 Ω is connected across its terminals, the current will be |
| A. | 0.041666666666667 |
| B. | 0.083333333333333 |
| C. | 2.5 A |
| D. | 0.20833333333333 |
| Answer» C. 2.5 A | |
| 1299. |
In the circuit, S was initially open. At time t = 0, S is closed. When the current through the inductor is 6 A, the rate of change of current through the resistor is 6 A/s. The value of the inductor would be |
| A. | 1 H |
| B. | 2 H |
| C. | 3 H |
| D. | 4 H |
| Answer» C. 3 H | |
| 1300. |
Assertion (A): A tree of graph contains all the nodes of the graph.Reason (R): The number of links is always less than the number of tree branches. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and 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» D. A is false but R is true | |