MCQOPTIONS
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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.
| 51. |
In the graph shown in the figure, for the tree with branches b, d and f the fundamental loops would include c |
| A. | abf, def, bdea |
| B. | bdc, def, fba |
| C. | abde, def, cdb |
| D. | cea, bdea, abbf |
| Answer» C. abde, def, cdb | |
| 52. |
Consider a 565 PLL with RT = 10 kΩ and CT = 0.01 μF. What is the output frequency of the VCO? |
| A. | 10 kHz |
| B. | 5 kHz |
| C. | 2.5 kHz |
| D. | 1.25 kHz |
| Answer» B. 5 kHz | |
| 53. |
The transfer function of a controller is given as Kp + Kd.s where Kp and Kd are constants. What type of controller is this? |
| A. | Proportional |
| B. | Proportional plus integral |
| C. | Proportional plus derivative |
| D. | Integral plus derivative |
| Answer» D. Integral plus derivative | |
| 54. |
System is : |
| A. | causal |
| B. | stable |
| C. | non causal |
| D. | anticausal |
| Answer» B. stable | |
| 55. |
Which one of the following is used as the interface chip for data transmission between 8086 and a 16-bit ADC? |
| A. | 8259 |
| B. | 8255 |
| C. | 8253 |
| D. | 8251 |
| Answer» C. 8253 | |
| 56. |
Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.Reason (R): The curl of B is equal to μ0 times the current density vector J |
| 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» C. (A) is true but (R) is false | |
| 57. |
In x = the value of x is |
| A. | 10 |
| B. | 25 |
| C. | 36 |
| D. | 44 |
| Answer» E. | |
| 58. |
Which of the following does not apply to Yagi-Uda antenna |
| A. | High gain |
| B. | Reasonably good bandwidth |
| C. | Folded dipole |
| D. | Parasitic elements |
| Answer» C. Folded dipole | |
| 59. |
If the intrinsic resistivity at 300°K is 0.37 ohm-m and the electron and hole mobilities at 300°K are 0.28 and 0.15 m2/volt-sec, then the intrinsic carrier concentration of Germanium is __________ . |
| A. | 2.92 x 1019/m3 |
| B. | 2.92 x 10-19/m3 |
| C. | 1.92 x 1019/m3 |
| D. | 3.92 x 1019/m3 |
| Answer» E. | |
| 60. |
Which of the following materials in not an insulator? |
| A. | Diamond |
| B. | Graphite |
| C. | Bakelite |
| D. | Lucite |
| Answer» C. Bakelite | |
| 61. |
For a given magnetic material operating in linear mode B = 0.06 T. Assume permeability = 51, then magnetization is: |
| A. | 44836 A/m |
| B. | 46834 A/m |
| C. | 946 A/m |
| D. | 936 A/m |
| Answer» C. 946 A/m | |
| 62. |
An antisymmetric filter having odd number of coefficient may have a performance as |
| A. | low pass |
| B. | high pass |
| C. | band pass |
| D. | all pass |
| Answer» E. | |
| 63. |
A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10 etc.What would be the RMS value of a sine wave having the same peak value as that of the above mentioned periodic wave? |
| A. | 42.2 V |
| B. | 19.098 V |
| C. | 38.2 V |
| D. | none of these |
| Answer» B. 19.098 V | |
| 64. |
A 'n' bit sequence generator employing SR flip-flop has maximum length of the sequence as : |
| A. | n |
| B. | 2n - 1 |
| C. | 2n-1 |
| Answer» D. | |
| 65. |
The Z-transform of a signal is given by its final value is __________ . |
| A. | infinite |
| B. | 43556 |
| C. | zero |
| D. | 1 |
| Answer» E. | |
| 66. |
The switch in the circuit shown was on position a for a long time, and is moved to position b at time t = 0. The current i(t) for t > 0 is given by |
| A. | 0.2e-125tu(t) mA |
| B. | 20e-1250tu(t) mA |
| C. | 0.2e-1250tu(t) mA |
| D. | 20e-1000tu(t) mA |
| Answer» C. 0.2e-1250tu(t) mA | |
| 67. |
Which of the following cannot provide as much time interval accuracy as the oscilloscope but can capture and display eight or more signals simultaneously, something that scopes cannot do? |
| A. | Logic analyzer |
| B. | Digital oscilloscope |
| C. | Frequency analyzer |
| D. | Wave analyzer |
| Answer» B. Digital oscilloscope | |
| 68. |
In 8085, Whenever a signal is received at TRAP terminal its program execution is transferred to a subroutine on address __________ . |
| A. | 0000 H |
| B. | 0024 H |
| C. | 002 CH |
| D. | provided by the address generation logic |
| Answer» C. 002 CH | |
| 69. |
In the signal flow graph of figure, y/x equals. |
| A. | 3 |
| B. | 43501 |
| C. | 2 |
| D. | None of the above |
| Answer» D. None of the above | |
| 70. |
The number of product terms in the minimized sum of product expression obtained through the following k map is (where "d" denotes don't care states) |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 71. |
The eigen values of a skew symmetric matrix are |
| A. | always zero |
| B. | always pure imaginary |
| C. | either zero or pure imaginary |
| D. | always real |
| Answer» D. always real | |
| 72. |
Which of the following be true for a CE transistor amplifier if the emitter resistor value is made equal to zero? Its gain will increaseIts stability will increaseIts gain will decreaseIts stability will decrease Select the correct answer from the codes given below |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» E. | |
| 73. |
The cut off voltage for JFET is 5 V. The pinch off voltage is __________ . |
| A. | (5.0)l/2 V |
| B. | 2.5 V |
| C. | V |
| D. | 5 V |
| Answer» E. | |
| 74. |
Consider points P and Q in the x-y plane, with P = (1, 0) and Q = (0, 1). The line integral 2 (xdx + ydy) along the semicircle with the line segment PQ as its diameter |
| A. | is - 1 |
| B. | is 0 |
| C. | is 1 |
| D. | depends on the direction (clockwise or anti-clockwise) of the semicircle |
| Answer» C. is 1 | |
| 75. |
Consider the following statements:The conductivity of a metal has negative temperature coefficient since: The electron concentration increases with temperature.The electron mobility decreases with temperature.The electron-lattice scattering rate increases with temperature. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 3 only |
| Answer» D. 3 only | |
| 76. |
The logic function f(A B, C) = Σm(0, 2, 4, 5, 6) represented by |
| A. | i |
| B. | i, ii |
| C. | i, iii |
| D. | i, ii, iii |
| Answer» C. i, iii | |
| 77. |
The following components are used to measure power output of a 2 kW TWT amplifier: TWTALow pass/high pass filter20 dB attenuator40 dB directional complex with matched loadPower load What is the correct sequence of connection of these components? |
| A. | 2 - 4 - 1 - 3 - 5 |
| B. | 1 - 3 - 4 - 2 - 5 |
| C. | 1 - 2 - 4 - 3 - 5 |
| D. | 2 - 4 - 1 - 5 - 3 |
| Answer» C. 1 - 2 - 4 - 3 - 5 | |
| 78. |
Value of ZL for maximum power transfer is |
| A. | R |
| B. | R + jωL |
| C. | R - jωL |
| D. | None of these |
| Answer» D. None of these | |
| 79. |
The Nyquist plot of |
| A. | will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the second quadrant |
| B. | will start from (ω = ∞) in the fourth quadrant and will terminate (ω = 0) in the second quadrant |
| C. | will start form (ω = ∞) in the second quadrant and will terminate (ω = 0) in the fourth quadrant |
| D. | will start from (ω = ∞) in the first quadrant and will terminate (ω = 0) in the fourth quadrant |
| Answer» B. will start from (œâ = ‚àû) in the fourth quadrant and will terminate (œâ = 0) in the second quadrant | |
| 80. |
In a series LCR circuit the maximum inductor voltage is twice the maximum capacitor voltage however current lags by 30° and drop across the inductance is vL = 100 sin 377t V. Assuming the resistance being 20 Ω, Find the values of the capacitance and inductance. |
| A. | 235 μF, 61.18 μH |
| B. | 230 μF, 61.18 μH |
| C. | 61.18 μF, 230 μH |
| D. | None of the above |
| Answer» C. 61.18 ŒºF, 230 ŒºH | |
| 81. |
The causal system given below is __________ |
| A. | minimum phase |
| B. | maximum phase |
| C. | mixed phase |
| D. | none of these |
| Answer» B. maximum phase | |
| 82. |
The fourier transform of the half cosine pulse as shown below is __________ |
| A. | 0.5 {sin [0.5(f - 1)] + sin [0.5 (f + 1)]} |
| B. | 0.25 [sin c[0.25 (f - 2)1 + sin c[0.25(f + 2)]] |
| C. | 0.5 {sin c [0.5 (f - 1)] + sin c [0.5 (f + 1)]} |
| D. | sin c(f - 0.5) + sin c (f + 0.5) |
| Answer» D. sin c(f - 0.5) + sin c (f + 0.5) | |
| 83. |
Consider a Binary Symmetric Channel (BSC) with probability of error being p. To transmit a bit, say 1, we transmit a sequence of three 1 s. The receiver will interpret the received sequence to represent 1 if at least two bits are 1. The probability that the transmitted bit will be received in error is |
| A. | p3 + 3p2 (1 - p) |
| B. | p3 |
| C. | (1 - p)3 |
| D. | p3 + p2 (1 -p) |
| Answer» B. p3 | |
| 84. |
Consider the following statements about ultrasonic flow meters: The measurement in insensitive to viscosity, pressure and temperature variations.It has bidirectional measuring capability and can be used for any pipe size.It has a relatively lower cost.It has good accuracy, fast response and wide frequency range. Which of the above statements is/are correct? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 1, 2 and 4 |
| D. | 3 and 4 only |
| Answer» D. 3 and 4 only | |
| 85. |
Gain of the circuit shown below is: |
| A. | 3 |
| B. | |
| Answer» B. | |
| 86. |
The feedback configuration and the pole-zero locations of G(s) are shown below. The root locus for negative values k, i.e., for -‚àû < k < 0, has breakaway/break in points and angle of departure at pole P (with respect to the positive real axis) equal to |
| A. | ± 2 and 0° |
| B. | ± 2 and 45° |
| C. | ± 3 and 0° |
| D. | ± 3 and 45° |
| Answer» C. ¬± 3 and 0¬∞ | |
| 87. |
In a number system with radix r, the decimal value of 110 is equal to 4r. The decimal values of 111 and r respective are equal to |
| A. | 20, 5 |
| B. | 16, 4 |
| C. | 13, 3 |
| D. | 8, 2 |
| Answer» D. 8, 2 | |
| 88. |
The antenna most commonly used for TV broadcasting in the UHF band is |
| A. | turnstile antenna |
| B. | dipole antenna |
| C. | yagi antenna |
| D. | rhombic antenna |
| Answer» D. rhombic antenna | |
| 89. |
In PSK modulation, the input signal is : |
| A. | S1(t) = A cos ω0t and S2(t) = - A cos ω0t |
| B. | S1(t) = S2(t) = A cos ω0t |
| Answer» B. S1(t) = S2(t) = A cos œâ0t | |
| 90. |
If h1[n] = 3δ[n] + δ[n - 1], h2[n] = 2δ[n] + δ[n - 2]h3[n] = δ[n] - 3δ[n - 1] + 7δ[n - 4] + 6δ[n - 6]h[n] = h1[n] * h2[n] + h3[n] * h1[n] has value |
| A. | {6, 18, 7, 4, 0, - 6, 9} |
| B. | {9, 0, - 6, 21, 7, 6, 1} |
| C. | {7, - 1, 3, 1, 7, 0, 6} |
| D. | {9, - 6, 0, 1, 21, 7, 18, 6} |
| Answer» E. | |
| 91. |
Number of fundamental cut-sets of any graph will be |
| A. | same as the number of twigs |
| B. | same as the number of tree branches |
| C. | same as the number of nodes |
| D. | equal to one |
| Answer» B. same as the number of tree branches | |
| 92. |
If the transfer function of the following network is The value of the load resistance RL is |
| A. | R/4 |
| B. | R/2 |
| C. | R |
| D. | 2R |
| Answer» D. 2R | |
| 93. |
A function is given f(t) = sin2t + cos2t. Which of the following is true? |
| A. | f has frequency components at 0 and 1/2p Hz |
| B. | f has frequency components at 0 and 1/p Hz |
| C. | f has frequency components at 1/2p and 1/p Hz |
| D. | f has frequency components at 0, l/2p and 1/p Hz |
| Answer» C. f has frequency components at 1/2p and 1/p Hz | |
| 94. |
The signal cos ωct + 0.5 cos ωmt sin ωct is |
| A. | FM only |
| B. | AM only |
| C. | both AM & FM |
| D. | neither AM nor FM |
| Answer» C. both AM & FM | |
| 95. |
An 8085 microprocessor is operating at 2 MHz frequency and executes the following program :START : MOV A, BOUT 55HDCR BSTA 2700HNOPNOPJMP STARTIdentify the total number of machine cycles required to execute the above program till the JMP instruction is executed for the first time. |
| A. | 12 |
| B. | 13 |
| C. | 14 |
| D. | 15 |
| Answer» D. 15 | |
| 96. |
When a particular mode is existed in a waveguide, there appears an extra electric component, in the direction of propagation. In what mode is the wave propagating? |
| A. | Transverse electric |
| B. | Transverse magnetic |
| C. | Transverse electromagnetic |
| D. | Longitudinal |
| Answer» C. Transverse electromagnetic | |
| 97. |
The circuit below represents function X(A, B, C, D) as: |
| A. | Σ(5, 8, 13, 14) |
| B. | ‚àè(0, 1, 2, 3, 4, 6, 7, 8, 10, 11, 12) |
| C. | Σ(5, 9, 13, 14) |
| D. | ‚àè(0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 15) |
| Answer» D. ‚àè(0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 15) | |
| 98. |
Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown? |
| A. | Only P has no cutoff- frequency |
| B. | Only Q has no cutoff- frequency |
| C. | Only P has no cutoff- frequency |
| D. | All there have cut-off frequency |
| Answer» B. Only Q has no cutoff- frequency | |
| 99. |
In n-well CMOS fabrication substrate is: |
| A. | heavily doped n-type |
| B. | heavily doped p-type |
| C. | lightly doped n-type |
| D. | lightly doped p-type |
| Answer» E. | |
| 100. |
Ferromagnetic materials show hysteresis in B - H characteristic. As the magnetic field in increased slowly from zero value, what is the first process which sets the material to give net magnetization? |
| A. | Growth of favourably oriented domains at the cost of other domains by reversible boundary displacements |
| B. | Growth of favourably oriented domains at the cost of other domains by irreversible boundary displacements |
| C. | Domain wall orientation |
| D. | A combination of processes (a) and (c) above |
| Answer» E. | |