MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 905 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.
| 301. |
The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual |
| A. | 243, 233, D |
| B. | 222, 158, B |
| C. | 243, 255, A |
| D. | 229, 243, E |
| Answer» C. 243, 255, A | |
| 302. |
Find Leq if each L is 1 H |
| A. | 4/3 H |
| B. | 1/3 H |
| C. | 2/3 H |
| D. | 3/2 D |
| Answer» D. 3/2 D | |
| 303. |
Consider the cascade structure of two filters. Consider the following statements. If f1 < f2 then it acts like band-pass filterIf f1 < f2 then it acts like band-pass only if HPF follows LPF in other case it acts like a band stop filterIf f1 > f2 then it acts all stop filter The correct statements are: |
| A. | 1 and 3 |
| B. | only 2 |
| C. | 2 and 3 |
| D. | only 3 |
| Answer» B. only 2 | |
| 304. |
Find 'X' in the circuit below:f1(A, B, C, D) = Σ(6, 7, 13, 14);f2(A, B, C, D) = Σ(3, 6, 7);f3(A, B, C, D) = Σ(5, 6, 7, 14, 15) |
| A. | ‚àè(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15) |
| B. | 0 |
| C. | Σ(14) |
| D. | 1 |
| Answer» D. 1 | |
| 305. |
The stage marked X in the architecture shown below of a two stage op-amp is : |
| A. | Direct coupled amplifier |
| B. | Buffer amplifier |
| C. | Level shifter |
| D. | Blocking oscillator |
| Answer» D. Blocking oscillator | |
| 306. |
Given below impulse response of two system h1(n) = [x(n + 1) - 2x(n) + 3x(n - 1)] h2(t) = e-2t u(4 - t) The correct statement is: |
| A. | h1(n) non causal and stable h2(t) non causal and stable |
| B. | h1(n) non causal and stable h2(t) non causal and non-stable |
| C. | h1(n) causal and not stable h2(t) non causal and stable |
| D. | h1(n) causal and stable h2(t) non causal and non-stable |
| Answer» C. h1(n) causal and not stable h2(t) non causal and stable | |
| 307. |
Find Vo(t) for the following circuit.Data: L = 1 H, C = 1 F, R1 = R2 = 1 Ω and zero initial conditions. |
| A. | 0 V |
| B. | 5 V |
| C. | 3 V |
| D. | 2 V |
| Answer» B. 5 V | |
| 308. |
A 300 MHz plane EM wave is propagating in free space. The wave is incident normally on an infinite copper slap. The antenuation constant for the wave is (σcopper = 5.8 x 107 mho/ m) |
| A. | 262 x 103 |
| B. | 254 x 103 |
| C. | 352 x 103 |
| D. | 354 x 103 |
| Answer» B. 254 x 103 | |
| 309. |
The signal y(t) = x(- t) is __________ . |
| A. | causal |
| B. | non-causal |
| C. | depends on x(t) |
| D. | none of these |
| Answer» D. none of these | |
| 310. |
The voltage applied to an R-L circuit at t = 0 when switch is closed is 100 cos (100 t + 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit? |
| A. | 0.041666666666667 |
| B. | 0.083333333333333 |
| C. | 0.20833333333333 |
| D. | 0.41666666666667 |
| Answer» B. 0.083333333333333 | |
| 311. |
The mechanical system shown below has its pole(s) at: |
| A. | #NAME? |
| B. | #NAME? |
| C. | #NAME? |
| D. | 0, - K/D |
| Answer» B. #NAME? | |
| 312. |
Consider following statements : Maximum energy of electrons liberated photoelectrically is independent of light intensity Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light. |
| A. | statement (1) is true and (2) is false |
| B. | statement (1) and (2) both are true |
| C. | statement (1) is false and (2) is true |
| D. | statement (1) and (2) both are false |
| Answer» B. statement (1) and (2) both are true | |
| 313. |
The Fourier series of a real periodic function has only Cosine terms if it is evenSine terms if it is evenCosine terms if it is oddSine terms if it is odd Which of the above statements are correct? |
| A. | (1) and (4) |
| B. | (1) and (2) |
| C. | (2) and (4) |
| D. | (2) and (3) |
| Answer» B. (1) and (2) | |
| 314. |
In the given circuit, the switch is open for a long time. At time t = 0, the switch is closed. What are the initial and final values of voltages across the inductor? |
| A. | 0 V and 0 V |
| B. | 0 V and 80 V |
| C. | 80 V and 0 V |
| D. | 80 V and 80 V |
| Answer» D. 80 V and 80 V | |
| 315. |
The following circuit is implementation of: sum of full addercarry of half adder difference of full subtractor |
| A. | 1 only |
| B. | 3 only |
| C. | 2 only |
| D. | 1 and 2 both |
| Answer» E. | |
| 316. |
A 1000 kHz carrier wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after passing the wave through this circuit? |
| A. | 0.4 |
| B. | 0.2 |
| C. | 0.27 |
| D. | 0.554 |
| Answer» D. 0.554 | |
| 317. |
In the circuit shown below current through the resistor is shown. Voltage across 4 Ω resistor is: |
| A. | 8 volt |
| B. | ≈ 5.87 V |
| C. | ≈ 6.87 V |
| D. | None of these |
| Answer» C. ‚âà 6.87 V | |
| 318. |
The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R = 0. The combinational logic required to realize a modulo 13 counter is |
| A. | F= Q4 Q3 Q2 Q1 |
| B. | F= Q4 + Q3 + Q2 + Q1 |
| C. | F = Q4 + Q3 + Q2 + Q1 |
| D. | F = Q4 Q3 Q2 Q1 |
| Answer» C. F = Q4 + Q3 + Q2 + Q1 | |
| 319. |
The constraint on r = |z| for which the following non-causal system converges is |
| A. | |z| < 1/4 |
| B. | |z| < 1/2 |
| C. | |z| < 4 |
| D. | |z| < 2 |
| Answer» C. |z| < 4 | |
| 320. |
An amplitude modulated signal occupies a frequency range from 395 kHz to 405 kHz. If can be demodulated by which of the following? |
| A. | Using an envelope detector and filter |
| B. | Multiplying with a 395 kHz local signal |
| C. | Multiplying with a 405 kHz local signal |
| D. | Low pass filtering with cut off at 400 kHz |
| Answer» E. | |
| 321. |
Consider the following, logic diagram :The count sequence of the above logic diagram is : |
| A. | 0000 to 1111 |
| B. | 0000 to 1001 |
| C. | 0000 to 1010 |
| D. | 1001 to 0000 |
| Answer» C. 0000 to 1010 | |
| 322. |
Evaluate the power stored in inductor and capacitor |
| A. | 25 J, 12.5 J |
| B. | 12.5 J, 25 J |
| C. | 25 J, 50 J |
| D. | 12.5 J, 50 J |
| Answer» B. 12.5 J, 25 J | |
| 323. |
V-I relationship of a network N is given by, V = 8 - 4I.The equivalent circuit to the network N is shown belowThe values of IN and RN are |
| A. | 0, 2 |
| B. | 0, 4 |
| C. | 2, 4 |
| D. | None of these |
| Answer» D. None of these | |
| 324. |
Which one of the following is not LED material? |
| A. | GaAs |
| B. | GaP |
| C. | SiC |
| D. | SiO2 |
| Answer» E. | |
| 325. |
Voice signal band limited to 3.4 KHz is sampled and pulse code modulated using 64 quantization levels. Ten such signals are time division multiplexed using one 5-bit synchronizing word every alternate frame. The minimum channel bandwidth required for transmission of the TDM signal is |
| A. | 100 KHz |
| B. | 200 KHz |
| C. | 50 KHz |
| D. | 150 KHz |
| Answer» C. 50 KHz | |
| 326. |
In the circuit below, if diodes and the moving coil millimeter are assumed to be ideal if mA reading is , find Vm. |
| A. | 1 mV |
| B. | 0.1 V |
| C. | 0.1 mV |
| D. | 1 V |
| Answer» E. | |
| 327. |
A second-order system has a transfer function is given by . If the system, initially at rest is subjected to a unit step input at t = 0, the second peak in response will occur at : |
| A. | p sec |
| B. | p/3 sec |
| C. | p/6 sec |
| D. | p/2 sec |
| Answer» D. p/2 sec | |
| 328. |
As per Hall effect, if any specimen carrying a current I is applied in a transverse magnetic field B, then an electric field E is induced in the specimen in the direction. |
| A. | parallel to I |
| B. | perpendicular to B and parallel to I |
| C. | parallel to I and B |
| D. | perpendicular to both I and B |
| Answer» E. | |
| 329. |
There are four different algorithms A1, A2, A3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm? |
| A. | A1 |
| B. | A2 |
| C. | A3 |
| D. | A4 |
| Answer» C. A3 | |
| 330. |
The antenna current of an AM broad cast transmitter, modulated to a depth of 40% by an audio sine wave is 11 amperes. It increased to 12 ampere as a result of simultaneous modulation by another sine wave. The modulation index due to this second sine wave is : |
| A. | 0.4 |
| B. | 0.757 |
| C. | 0.643 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 331. |
When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ . |
| A. | source, sink |
| B. | sink, source |
| C. | positive value, negative value |
| D. | negative value, positive value |
| Answer» B. sink, source | |
| 332. |
For plane wave propagating in free space or two conductor transmission line, what must be the relationship between the phase velocity vp , the group velocity vg and speed of light c? |
| A. | vp > c > vg |
| B. | vp < c < vg |
| C. | vp = c = vg |
| D. | vp < vg < c |
| Answer» D. vp < vg < c | |
| 333. |
The circuit shown in the figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connected as followFor 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2, ...) S1 to P1 and S2 to P2For (2n + 1) T ≤ t < (2n + 2)T, (n = 0, 1, 2, ...) S1 to Q1 and S2 to Q2 Assume that the capacitor has zero initial charge. Given that u(t) is a unit step function, the voltage Vc(t) across the capacitor is given be |
| A. | (- 1)n tu(t - nT) |
| B. | u(t) + 2 (-1)n u(t - nT) |
| C. | tu(t) + 2 (-1)n (t - nT) u(t - nT) |
| D. | [0.5 - e-(t - 2nT) + 0.5e-(t - 2nT - T) ] |
| Answer» B. u(t) + 2 (-1)n u(t - nT) | |
| 334. |
Which of the following capabilities are available in a Universal Shift Register? Shift leftShift rightParallel loadSerial add Select the correct answer from the codes given below: |
| A. | 2 and 4 only |
| B. | 1, 2 and 3 |
| C. | 1, 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» C. 1, 2 and 4 | |
| 335. |
Consider an input x(t) as shown System impulse response is: If input is passed through this system then output will be zero except |
| A. | #NAME? |
| B. | 0 < t < 11 |
| C. | #NAME? |
| D. | 2 < t < 6 |
| Answer» C. #NAME? | |
| 336. |
A ring counter with 5 flip-flops will have __________ states. |
| A. | 5 |
| B. | 10 |
| C. | 32 |
| D. | Infinite |
| Answer» B. 10 | |
| 337. |
A load ZL = RL + jXL is to be matched using an ideal transformer to generator of internal impedance ZS = RS + jXS. The ratio of transformer required is __________ . |
| A. | |ZS|/|ZL| |
| B. | RL/RS |
| C. | RL/ZS |
| D. | |ZL|/RS |
| Answer» B. RL/RS | |
| 338. |
Which of the following antennas uses a number of varying length parallel elements? |
| A. | Helical antenna |
| B. | Pyramidal Horn |
| C. | Comer reflection antenna |
| D. | Yagi-Uda antenna |
| Answer» E. | |
| 339. |
The effective modulation index is: |
| A. | 0.91287 |
| B. | 0.8306 |
| C. | 1 |
| D. | none of these |
| Answer» D. none of these | |
| 340. |
The following circuit is implementation of Sum of full adderCarry of half adderDifference of full subtractor |
| A. | (i) only |
| B. | (iii) only |
| C. | (ii) only |
| D. | (i) and (ii) |
| Answer» E. | |
| 341. |
For determining the network functions of a two-port network, it is required to consider that |
| A. | all initial conditions remain same |
| B. | all initial conditions are zero |
| C. | part of initial conditions are equal to zero |
| D. | initial conditions vary depending on nature of network |
| Answer» C. part of initial conditions are equal to zero | |
| 342. |
Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually 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» D. A is false but R is true | |
| 343. |
For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is |
| A. | 00H |
| B. | 45H |
| C. | 67H |
| D. | E7H |
| Answer» D. E7H | |
| 344. |
Which of the following is a microwave source with a 'cross-field' structure? |
| A. | Double cavity klystron |
| B. | Reflex klystron |
| C. | Magnetron |
| D. | Travelling wave tube |
| Answer» D. Travelling wave tube | |
| 345. |
Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material? |
| A. | Diaphragm |
| B. | Capacitor |
| C. | L.V.D.T. |
| D. | Piezoelectric crystal. |
| Answer» C. L.V.D.T. | |
| 346. |
Given below a block diagram of oscillator circuit with various reactance elements. For colpitts oscillator which is correct? |
| A. | x1 = C, x2 = L, x3 = C |
| B. | x1 = C, x2 = L, x3 = L |
| C. | x1 = C, x2 = C, x3 = L |
| D. | x1 = L, x2 = C, x3 = L |
| Answer» D. x1 = L, x2 = C, x3 = L | |
| 347. |
An infinite ladder is constructed with 1 Ω and 2 Ω resistors as shown below. Find i |
| A. | 8.1818 A |
| B. | 0 |
| C. | 0.375 |
| D. | cannot be determined |
| Answer» D. cannot be determined | |
| 348. |
Consider the following statements regarding the properties of an R-L-C series circuit under resonance: Current in the circuit is in phase with applied voltageVoltage drop across capacitor C and inductance L are equal in magnitude.Voltage across the capacitor is equal in magnitude to the applied voltage.Current in the circuit is maximum. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 1, 2 and 4 |
| C. | 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» C. 2 and 4 | |
| 349. |
Choose the correct statement/statements : |
| A. | In case of an antenna, the antenna resistance and loss resistance are not two different quantities. |
| B. | The loss resistance includes loss by eddy currents, improper earth connections, insulation leakages, etc., but not I2R losses. |
| C. | Radiation resistance varies directly as square-root of frequency |
| D. | None |
| Answer» E. | |
| 350. |
The matrix A is defined as A = . The eigen values of A2 are |
| A. | -1, -9, -4 |
| B. | 1, 9, 4 |
| C. | 1, 3, -2 |
| D. | -1, -3, 2 |
| Answer» C. 1, 3, -2 | |