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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5051. |
The amplifier network is shown below: re and z0 is: |
| A. | 6.42 kΩ, 5.6 kΩ |
| B. | 6.42 Ω, (5.62) kΩ |
| C. | 6.4kΩ, (5.62) kΩ |
| D. | 6.42 Ω, 5.6 kΩ |
| Answer» E. | |
| 5052. |
For the power amplifier circuit shown below, the maximum power dissipated by both output transistor is |
| A. | 9.66 W |
| B. | 30.11 W |
| C. | 31.66 W |
| D. | 33.66 W |
| Answer» D. 33.66 W | |
| 5053. |
Rank of the matrix: |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» D. 4 | |
| 5054. |
The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be |
| A. | 1011 |
| B. | 1101 |
| C. | 1100 |
| D. | 1110 |
| Answer» E. | |
| 5055. |
His rather casual remarks on politics __________ his lack of seriousness about the subject. |
| A. | masked |
| B. | belied |
| C. | cherish |
| D. | conserve |
| Answer» D. conserve | |
| 5056. |
The open loop transfer function of a unity feedback system is: The range of K for which the system is stable is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-40-1.png"> |
| B. | 13 > K > 0 |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/16-04-40-3.png"> |
| D. | -6 < K < |
| Answer» B. 13 > K > 0 | |
| 5057. |
A discrete time linear shift-invariant system has an impulse response h[n] with h[0] = 1, h[1] = - 1, h[2] - 2, and zero otherwise. The system is given an input sequence x[n] with x[0] - x[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[2] are, respectively |
| A. | 5, 2 |
| B. | 6, 2 |
| C. | 6, 1 |
| D. | 5, 3 |
| Answer» E. | |
| 5058. |
If we manage to __________ our natural resources, we would leave a better planet for our children. |
| A. | uphold |
| B. | restrain |
| C. | Cherish |
| D. | conserve |
| Answer» E. | |
| 5059. |
The circuits with active pull up are preferred because of their stability for |
| A. | wired - AND operation |
| B. | wired - OR operation |
| C. | bus operated system |
| D. | reasonable dissipation and speed of operation |
| Answer» B. wired - OR operation | |
| 5060. |
A scheme shown below is to generate a wide band FM modulate signal. Narrow band FM has carrier frequency = 400 KHz Deviation ratio = 0.2 Wide band FM has carrier frequency = 100 MHz Deviation ratio = 6 Local oscillator frequencies can be |
| A. | 88 MHz, 112 MHz |
| B. | 96 MHz, 104 MHz |
| C. | 92 MHz, 108 MHz |
| D. | 90 MHz, 110 MHz |
| Answer» B. 96 MHz, 104 MHz | |
| 5061. |
How many maximum number of functions can be defined with two symbols which are Boolean in nature: |
| A. | 4 |
| B. | 8 |
| C. | 2 |
| D. | 16 |
| Answer» E. | |
| 5062. |
The characteristic equation of a control system is given as s4 + 4s3 + 4s2 + 3s + K = 0.What is the value of K for which this system is marginally stable? |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-55-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-55-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-55-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/9-04-55-4.png"> |
| Answer» E. | |
| 5063. |
The minimum energy of a photon required for intrinsic excitation is equal to |
| A. | energy of bottom of conduction band |
| B. | energy of top of valence band |
| C. | forbidden gap energy |
| D. | Fermi energy |
| Answer» D. Fermi energy | |
| 5064. |
In a communication system, a process in which statistical averages and time averages are equal is called as, |
| A. | stationary |
| B. | ergodic |
| C. | Gaussian |
| D. | BIBO stable |
| Answer» C. Gaussian | |
| 5065. |
The materials not having negative temperature coefficient of resistivity are |
| A. | metals |
| B. | semiconductors |
| C. | insulators |
| D. | none of the above |
| Answer» B. semiconductors | |
| 5066. |
The characteristic equation of a control system is given as s4 + 8s3 + 24s2 + 32s + K = 0. What is the range of values of K for this system to be stable? |
| A. | 0 K < 80 |
| B. | 0 K < 100 |
| C. | 0 K < 2300 |
| D. | 0 K < 600 |
| Answer» B. 0 K < 100 | |
| 5067. |
If a vector field is related to another vector field through which of the following is true? Note: C and Sc refer to any closed contour and any surface whose boundary is C. |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-03-23-3.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-03-23-4.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-03-23-5.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-03-23-6.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/6-03-23-5.png"> | |
| 5068. |
A scheme shown below is to generate a wide band FM modulate signal. Narrow band FM has carrier frequency = 400 KHz Deviation ratio = 0.2 Wide band FM has carrier frequency = 100 MHz Deviation ratio = 6 Frequency multiplication factor is: |
| A. | 30 |
| B. | 6 |
| C. | 250 |
| D. | 12 |
| Answer» B. 6 | |
| 5069. |
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. | |
| 5070. |
Following one is moving average system __________ . |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/10-02-23-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/10-02-23-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/10-02-23-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/10-02-23-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/10-02-23-3.png"> | |
| 5071. |
Which of the following circuits come under the class of sequential logic circuits? Full adderFull subtractor Half adderJ-K flip-flopCounter Select the correct answer from the codes given below: |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 3 and 4 |
| D. | 4 and 5 |
| Answer» E. | |
| 5072. |
Which of the following measurements can be done using a counter? Pulse durationInterval between two pulses Amplitude of the pulse Rise time of a pulse Select the correct answer from the codes given below: |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 4 |
| D. | 2 and 4 |
| Answer» B. 2 and 3 | |
| 5073. |
The maximum power dissipation capacity of a transistor is 50 mW. If the collector emitter voltage is 10 V, what is the safe collector current that can be allowed through the transistor? |
| A. | 5 mA |
| B. | 2.5 mA |
| C. | 10 mA |
| D. | 25 mA |
| Answer» C. 10 mA | |
| 5074. |
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 and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit? |
| A. | 1 A |
| B. | 2 A |
| C. | 5 A |
| D. | 10 A |
| Answer» B. 2 A | |
| 5075. |
If (10)x x (10)x = (100)x; (100)x x (100)x = (10000)x then x can take value : |
| A. | 2 |
| B. | 5 |
| C. | 10 |
| D. | all of these |
| E. | <span style="text-decoration:overline;"></span> |
| Answer» E. <span style="text-decoration:overline;"></span> | |
| 5076. |
Laplace transform of |
| A. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-747-51-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-747-51-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-747-51-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-747-51-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/exam-question-papers/1-747-51-2.png"> | |
| 5077. |
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 | |
| 5078. |
The number of essential prime implicant for the logic expression F = ABC + C D A + CDA + ABC + BD |
| A. | 3 |
| B. | 5 |
| C. | 4 |
| D. | 6 |
| Answer» B. 5 | |
| 5079. |
Which one of the following is a trivalent material? |
| A. | Antimony |
| B. | Phosphorus |
| C. | Arsenic |
| D. | Boron |
| Answer» E. | |
| 5080. |
In orthogonal BFSK. the energy of information bearing term is : |
| A. | the same as total transmitted energy |
| B. | one half of total transmitted energy |
| C. | one fourth of total transmitted energy |
| D. | None |
| Answer» B. one half of total transmitted energy | |
| 5081. |
Consider the following statements:In a microstrip line Wavelength , where eff is the effective dielectric constant and 1 is the free space wavelength.Electromagnetic fields exist partly in the air above the dielectric substrate and partly within the substrate itself.The effective dielectric constant is greater than the dielectric constant of the air.Conductor losses increase with decreasing characteristic impedance. Which of the above statements is/are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2, 3 and 4 |
| D. | 2, 3 and 4 |
| Answer» B. 1 and 2 only | |
| 5082. |
Consider the differential amplifier shown in figure. (Assume is very high).IE(approximately) = |
| A. | 2 mA |
| B. | 1 mA |
| C. | 0.5 mA |
| D. | 3 mA |
| Answer» B. 1 mA | |
| 5083. |
With regard to a transmission line, which of the following statements is correct? |
| A. | Any impedance repeats itself every 1/4 on the Smith chart. |
| B. | The S.W.R. = 2 circle and the magnitude of reflection coefficient = 0.5 circle coincide on the Smith chart. |
| C. | At any point on a transmission line, the current reflection coefficient is the reciprocal of the voltage reflection coefficient. |
| D. | Matching eliminates the reflected wave between the source and the matching device location. |
| Answer» D. Matching eliminates the reflected wave between the source and the matching device location. | |
| 5084. |
The probability density function of the envelope of narrow band noise is : |
| A. | Uniform |
| B. | Gaussian |
| C. | Rayleigh |
| D. | None |
| Answer» C. Rayleigh | |
| 5085. |
What is the chemical bonding in silicon semiconductor? |
| A. | Metallic |
| B. | Ionic |
| C. | Covalent |
| D. | van der Waals |
| Answer» D. van der Waals | |
| 5086. |
What happens when a paramagnetic material is heated above Curie temperature? |
| A. | It becomes diamagnetic |
| B. | It becomes nonmagnetic |
| C. | It becomes ferromagnetic |
| D. | It becomes anti-ferromagnetic |
| Answer» B. It becomes nonmagnetic | |
| 5087. |
Consider the following statementsA 4 : 16 decoder can be constructed (with enable i/p) by Using four 2 : 4 decoders (each with an enable i/p) onlyUsing five 2 : 4 decoders (each with an enable i/p) onlyUsing two 3 : 8 decoders (each with an enable i/p) onlyUsing two 3 : 8 decoders (each with an enable i/p) only Which of the statements given above is/are correct? |
| A. | 2 and 3 |
| B. | 1 only |
| C. | 2 and 4 |
| D. | none |
| Answer» C. 2 and 4 | |
| 5088. |
How many roots with positive real parts do the equation s3 + s2 - s + 1 = 0 have? |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» D. Three | |
| 5089. |
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. | |
| 5090. |
What current does represent in pn junction diode? (where the symbols have their usual meaning) |
| A. | Forward current |
| B. | Diffusion current |
| C. | Drift current |
| D. | Reverse saturation current |
| Answer» E. | |
| 5091. |
If the carrier modulated by a digital bit stream has one of the possible phases of 0 , 90 , 180 and 270 . Then the modulation is called |
| A. | BPSK |
| B. | QPSK |
| C. | QAM |
| D. | MSK |
| Answer» C. QAM | |
| 5092. |
The internal resistance of a current source used in the model of a BJT while analyzing a circuit using BJT is : |
| A. | very high |
| B. | very low |
| C. | zero |
| D. | of the order of a few mega ohms |
| Answer» B. very low | |
| 5093. |
Consider the network: Impedance of this network as a function of the complex frequency is consists of a certain number of zeros and poles. What is the location of poles? |
| A. | -2 |
| B. | -2, |
| C. | 2 |
| D. | 2, |
| Answer» C. 2 | |
| 5094. |
Which one of the following type of negative feedback increases the input resistance and decreases the output resistance of an amplifier? |
| A. | Current series feedback |
| B. | Voltage series feedback |
| C. | Current shunt feedback |
| D. | Voltage shunt feedback |
| Answer» C. Current shunt feedback | |
| 5095. |
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. | <span class="root">|Z<sub>S</sub>|/|Z<sub>L</sub>|</span> |
| B. | <span class="root">R<sub>L</sub>/R<sub>S</sub></span> |
| C. | <span class="root">R<sub>L</sub>/Z<sub>S</sub></span> |
| D. | <span class="root">|Z<sub>L</sub>|/R<sub>S</sub></span> |
| Answer» B. <span class="root">R<sub>L</sub>/R<sub>S</sub></span> | |
| 5096. |
An AC source or RMS voltage 20V with internal impedance Zs = (1 + 2j) feeds a load of impedance ZL = (7 + 4j) in the figure below. The reactive power consumed by the load is |
| A. | 8 VAR |
| B. | 16 VAR |
| C. | 28 VAR |
| D. | 32 VAR |
| Answer» B. 16 VAR | |
| 5097. |
Electric dipole is located at origin in a medium with r = 6, has a moment P = (4ax - 2ay + az ) nC. Then potential at (2, 4, 4) is: |
| A. | 0.062 |
| B. | 0.027 |
| C. | 0.042 |
| D. | 0.072 |
| Answer» C. 0.042 | |
| 5098. |
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 | |
| 5099. |
A heavily doped semiconductor exhibits a __________ such a device is called sensistors. |
| A. | negative temperature coefficient of resistance |
| B. | positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance |
| C. | positive temperature coefficient of resistance |
| D. | none of the above |
| Answer» D. none of the above | |
| 5100. |
Sampling frequency of sin 100pt + cos 200pt + sin 100pt + cos 200pt is: |
| A. | 100 Hz |
| B. | 200 Hz |
| C. | 400 Hz |
| D. | none of these |
| Answer» E. | |