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.
| 1201. |
The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be |
| A. | a zero in left half plane |
| B. | a zero in right half plane |
| C. | a pole in left half plane |
| D. | a pole or zero in left half plane |
| Answer» B. a zero in right half plane | |
| 1202. |
The poles and zeros of a positive real function |
| A. | may lie any where in s plane |
| B. | may have positive or negative real part |
| C. | must occur in conjugate pair |
| D. | must have either negative or zero real part |
| Answer» E. | |
| 1203. |
Wire-wound resistors are unsuitable for use at high frequencies because they |
| A. | are likely to melt under excessive eddy current heat |
| B. | exhibit unwanted inductive and capacitive effects |
| C. | create more electrical noise |
| D. | consume more power |
| Answer» C. create more electrical noise | |
| 1204. |
As temperature increases, the temperature coefficient of metals increases. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1205. |
In figure, the power dissipated in 4 resistance is P1 and power associated with 3 A source is P2. Then |
| A. | P1 = P2 |
| B. | P1 < P2 |
| C. | P1 > P2 |
| D. | P1 may be equal or less than P2 |
| Answer» D. P1 may be equal or less than P2 | |
| 1206. |
Laplace transform of a unit doublet U-2 (t) is |
| A. | 1/s |
| B. | s |
| C. | 0 |
| D. | 1 |
| Answer» C. 0 | |
| 1207. |
In the network shown in figure, the voltage drops across R2 and R3 are 10 V and 16 V with polarities as shown. The current in R1 |
| A. | is 9 A and directed towards node 0 |
| B. | is 9 A and directed away from node 0 |
| C. | is 9 A but directed of current cannot be found |
| D. | is impossible to be found |
| Answer» C. is 9 A but directed of current cannot be found | |
| 1208. |
In the circuit shown in figure, maximum power will be transferred when |
| A. | ZL = 13 - j 9 |
| B. | ZL = 13 + j 9 |
| C. | ZL = 9 - j 13 |
| D. | ZL = 9 + j 13 |
| Answer» D. ZL = 9 + j 13 | |
| 1209. |
In figure, the switch S is initially open and steady state conditions are reached. At t = 0 switch is closed. The initial current through 2C capacitor is |
| A. | zero |
| B. | 0.041666666666667 |
| C. | 0.083333333333333 |
| D. | 0.125 |
| Answer» C. 0.083333333333333 | |
| 1210. |
The ideal voltmeter V of figure will read __________ volt. |
| A. | 0 |
| B. | 10 |
| C. | 5 |
| D. | 1 |
| Answer» C. 5 | |
| 1211. |
Which is correct for a transfer function? |
| A. | The poles and zero must be complex |
| B. | If the poles and zeros are complex or imaginary, they must be conjugate |
| C. | If the poles and zeros are complex they must be simple |
| D. | If a zero is imaginary, it must be simple |
| Answer» B. If the poles and zeros are complex or imaginary, they must be conjugate | |
| 1212. |
Thermistor has a positive temperature coefficient. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1213. |
A series resonant circuit is fed by a voltage having rms value V. At resonance, the voltage across inductance VL and voltage across capacitance VC are related as |
| A. | VL > VC |
| B. | VL < VC |
| C. | VL = VC |
| D. | VL = 0.5 VC |
| Answer» D. VL = 0.5 VC | |
| 1214. |
Which one of the following is a passive device/Component? |
| A. | Transformer |
| B. | Oscillator |
| C. | Generator |
| D. | None |
| Answer» B. Oscillator | |
| 1215. |
The distributors for residential areas are |
| A. | single phase |
| B. | three phase three wire |
| C. | three phase 4 wire |
| D. | (a) or (b) |
| Answer» D. (a) or (b) | |
| 1216. |
In a discharging R-L circuit voltage across the resistor exhibits |
| A. | a linear rise |
| B. | a linear decay |
| C. | an exponential growth function |
| D. | an exponential decay function |
| Answer» E. | |
| 1217. |
In figure, I = 2A, then V = |
| A. | 5 V |
| B. | 3 V |
| C. | 2 V |
| D. | 1 V |
| Answer» D. 1 V | |
| 1218. |
An RLC series circuit has . If the poles p1 and p1* are close to jω axis, then |
| A. | Q is high |
| B. | Q is low |
| C. | ω0 is high |
| D. | bandwidth is large |
| Answer» E. | |
| 1219. |
In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is |
| A. | 0.041666666666667 |
| B. | 1.25 A |
| C. | 0.25 |
| D. | 6.25 A |
| Answer» B. 1.25 A | |
| 1220. |
Which of the following material has nearly zero temperature-coefficient of resistance? |
| A. | Carbon |
| B. | Porcelain |
| C. | Copper |
| D. | Manganin |
| Answer» E. | |
| 1221. |
As B is increased from zero to about 2T, μr, of a ferromagnetic material |
| A. | increase |
| B. | decrease |
| C. | first increases then decreases |
| D. | remains the same |
| Answer» D. remains the same | |
| 1222. |
In a series RLC circuit, p-f is leading if XC < XL. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1223. |
When iron rod is magnetised by the flowing through its coil, the polarities of its different points will be |
| A. | Pole A is N-pole, B is S-pole and C is neutral |
| B. | A is N, B and C is S |
| C. | A is N, C is S |
| D. | A is S, C is neutral, B is N |
| Answer» B. A is N, B and C is S | |
| 1224. |
Threshold of perception occurs at a current of about 1 mA. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1225. |
The peak factor is the ratio of |
| A. | peak and rms values |
| B. | peak and average values |
| C. | rms and average values |
| D. | none of the above |
| Answer» B. peak and average values | |
| 1226. |
In figure, V reads 45V. Then I = |
| A. | 10.1 A |
| B. | 13.3 A |
| C. | 16.1 A |
| D. | 19.4 A |
| Answer» B. 13.3 A | |
| 1227. |
For the current wave i = 10 + 10 sin θ, the rms value is |
| A. | 0.41666666666667 |
| B. | 12.247 A |
| C. | 20 A |
| D. | 14.14 A |
| Answer» C. 20 A | |
| 1228. |
Find Vth in the circuit |
| A. | 100 V |
| B. | 10 V |
| C. | 0 V |
| D. | 5 V |
| Answer» D. 5 V | |
| 1229. |
The resistance of the circuit shown is figure is |
| A. | 5 Ω |
| B. | More than 6 Ω |
| C. | More than 4 Ω |
| D. | Between 6 and 7 Ω |
| Answer» B. More than 6 Œ© | |
| 1230. |
Norton's theorem reduces a two terminal network to |
| A. | a constant current source and an impedance is parallel |
| B. | a constant current source and an impedance in series |
| C. | a constant voltage source and an impedance in parallel |
| D. | a constant voltage source and an impedance in series |
| Answer» B. a constant current source and an impedance in series | |
| 1231. |
A network is causal if impulse response is zero for t < 0. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1232. |
If operator 'a' = 1 ∠120° then (1 - a2) = |
| A. | 1 ∠ - 30° |
| B. | 1 ∠ 30° |
| C. | 1 ∠ - 60° |
| D. | 1 ∠60° |
| Answer» B. 1 ‚à† 30¬∞ | |
| 1233. |
A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is |
| A. | 0.083333333333333 |
| B. | 0.041666666666667 |
| C. | 106A |
| D. | 10 μA |
| Answer» B. 0.041666666666667 | |
| 1234. |
When ac current is zero, no electrons are in motion. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1235. |
The natural frequency Sn of the given circuit is |
| A. | -1 |
| B. | 1 |
| C. | 43497 |
| D. | -2 |
| Answer» B. 1 | |
| 1236. |
A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are |
| A. | 9 H and 18 J |
| B. | 18 H and 36 J |
| C. | 54 H and 108 J |
| D. | 108 H and 216 J |
| Answer» D. 108 H and 216 J | |
| 1237. |
In an ac network the sum of currents entering a node is 10 ∠45°. The sum of currents leaving the node is |
| A. | 19.32 ∠45° |
| B. | 15 ∠45° |
| C. | 20 ∠45° |
| D. | zero |
| Answer» B. 15 ‚à†45¬∞ | |
| 1238. |
In the circuit of figure the current through C at t = ‚àû is |
| A. | 0.16666666666667 |
| B. | 2.5 A |
| C. | 3.1 A |
| D. | 0 |
| Answer» E. | |
| 1239. |
A 10 ohm resistance and a 10 ohm capacitor are connected in series across a 100 V ac supply. The rms voltage across resistance is |
| A. | 1002V |
| B. | 100 V |
| C. | |
| Answer» D. | |
| 1240. |
In a RL circuit, the angle, θ by which the current lags the voltage is |
| A. | 0 > θ > - 90° |
| B. | 90° |
| C. | 0° |
| D. | 0 < θ < 90° |
| Answer» E. | |
| 1241. |
Class C solid insulators should not be used above 100°C. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1242. |
Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.Reason (R): The sum of positive real functions is real. |
| 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. | |
| 1243. |
The unit of permeability is |
| A. | T |
| B. | Wb |
| C. | H/M |
| D. | H |
| Answer» D. H | |
| 1244. |
Two 2 port circuits are connected cascaded. To determine the response, it is more convenient to use |
| A. | O.C. impedance parameters |
| B. | S.C. admittance parameters |
| C. | ABCD parameters |
| D. | h parameters |
| Answer» D. h parameters | |
| 1245. |
The nodal method of circuit analysis is based on |
| A. | KVLs, ohm law |
| B. | KCLs, ohm law |
| C. | KCLs, KVL |
| D. | KCL, KVL, ohms law |
| Answer» C. KCLs, KVL | |
| 1246. |
A series resonant circuit has R = 10 Ω, L = 1 μH and C = 1 mF. If R is increased to 20 Ω the resonant frequency |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increases or decreases |
| Answer» D. may increases or decreases | |
| 1247. |
Assertion (A): An impulse has very high magnitude but very small duration.Reason (R): A pulse function is always rectangular. |
| 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 | |
| 1248. |
The dual of a node is |
| A. | mesh |
| B. | principal node |
| C. | tree branch |
| D. | link |
| Answer» B. principal node | |
| 1249. |
If f(t) = - f(- t) and f(t) satisfies Dirichlet conditions, then f(t) can be expanded in Fourier series having |
| A. | sine terms only |
| B. | cosine terms only |
| C. | cosine and constant terms |
| D. | sine and constant term |
| Answer» B. cosine terms only | |
| 1250. |
For an RC impedance function Z |
| A. | Z(‚àû) = Z(0) |
| B. | Z(‚àû) < Z(0) |
| C. | Z(∞) ≤ Z(0) |
| D. | Z(‚àû) > Z(0) |
| Answer» D. Z(‚àû) > Z(0) | |