d) None of the mentioned Conical a) Voltage divider circuit 9.          2. d) Class D But time scaling will change the rate. a) -51 Answer: d Answer: a a) l=log(to the base 2)L d) All of the mentioned Frequency, ωm = 300π None of these, 57. c) 1% negative feedback fH = 15 kHz b) Input resistance is infinite and output resistance is zero Is same as the free space impedance Explanation: Gain= Rf/Rs= 13 and vo= (-Rf/Rs)*vs. Quarter wave transmission line 39.          1. Explanation: The RF bandwidth of an AM signal is equal to BAM=2fm. c) -17 c) Number of error bits from total number of bits When frequency of oscillation of a crystal oscillator becomes parallel resonance frequency reactance of crystal oscillator becomes __________ They depend on straight line propagation which applies to microwaves only Explanation: Source coding is the method of converting a word to stream of bits that is 0’s and 1’s.          4. a) a test load c) AM c) 1000 Hz, 1 sec Answer: b Answer: a 25. c) Modulation index d) 0.5 V When the temperature is increased, what happens to the collector current after a feedback is given? d) 2 Hz, 12sec          2. Explanation: There are four basic forms of pulse modulation. = 48.07. For which of the modulated system, the linear amplified modulated stage is used? d) None of the mentioned a) Modulating signal voltage < Carrier voltage 28. d) band reject filter What is the function of RF mixer? d) common emitter & base          1. The feedback is provided through a capacitor voltage divider tank circuit to the amplifying element.          1. b) Ib = ß + 1/ Ic d) Pulse width changes in accordance with the amplitude of modulating signal Here -127 represents certainly zero.          1. Which of the following class have a theoretical efficiency of 50%? Answer: b What is the bandwidth required in SSB signal?          4. b) Standard Optical Network a) common collector d) Mass Explanation: Common emitter configuration is used for amplifying distorted oscillatory signal to a perfect oscillation. c) A is correct and B is incorrect          3. d) Input voltage The AC gain |A| = AOL1+(f/5)2√          2. 78. What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V? b) 8.6v Answer: c a) Input voltage is equal to output voltage c) No method is used b) Modulating signal voltage > Carrier voltage d) Variable to variable length algorithm Explanation: In summing amplifier the output voltage is equal to the sum of all input. a) VCC – RCIC+RBIB Its bandwidth b) The non-inverting amplifier None of these, 16. What is the DC characteristic used to prove that the transistor is indeed biased in saturation mode? Carrier amplitude only Explanation: When the base of the logarithm is 2 then the unit of measure of information is bits. Which filter is used to get back the original signal from sampled signal? The signal spectrum consists of infinite frequencies. 4           c.8          d. 16, 82. Pulse repetition frequency (PRF) = 1/(PRI) Continuous wave (CW) radar: Duty cycle = 100% (always on) Target. B: Its internal structure uses a capacitor Answer: d The return loss in a transmission line is a measure of 35. d) All of the mentioned b) Mid frequency region For the second example we consider a pulse radar which emits a pulse train with a given pulse repetition time interval (PRI) or reciprocal pulse repetition frequency (PRF), respectively. 41. a) The collector current is inversely proportional to the base current Explanation: LCD uses liquid crystal display. a) Prevent d) Operate it in the saturation region Explanation: In an oscillator if phase of feedback is same as that of oscillation waveform then feedback is called positive feedback. b) 5mv a) Reduction in transmission bandwidth a) The collector current is directly proportional to the base current b) IE = IQ Answer: c          1. Matching the source and free space Answer: c It is a down converter circuit which converts the input bandpass signal to a baseband signal. b) Dense Wavelength Division Modulation d) Duplexer Amplitude modulation c) 25KHz and 35KHz Nyquist interval, T = 12fm = 1 sec. Answer: d Generally the two networks, pi and T are used for impedance matching.          1. d) None of the mentioned Return. 71. c) Integrating a PPM signal None of these, 10.          2. a) VO= – {[(RF/Ra)×Va] +[(RF/Rb)×Vb]+[(RF/Rc)×Vc]} Nyquist interval, T = 1Fs=12000 = 0.5 msec. Vertical blanking c) Input resistance is zero and output resistance is infinite In which amplifier the output voltage is equal to the negative sum of all the inputs? d) Pulse frequency modulation The input and output signals are in phase. d) None of the mentioned Explanation: If the carrier wave is sinusoidal, then we can vary its amplitude, frequency, and phase in proportion with the wave which is transmitted. c) Positive feedback Explanation: In pulse modulation, the information to be transmitted is represented by a series of binary pulses. Answer: d Answer: c Answer: a Which of the following oscillator is not using a feedback network for its oscillation? Ensure bunching a) Remove error bursts Explanation: The unit of average mutual information is bits. In erlangs, 83. d) Service Optical Network From the given option, the combination of input voltage 7v, 4v and -3v gives the value 9v. Balance modulator suppresses the carrier and leaves only the sidebands.          3. a) Peaks overlapping Delta modulation uses _____ bits per sample. b) 0.25 Answer: c a) Vo = -(RF /R1)*Vx Explanation: A blocking oscillator is a non-sinusoidal oscillator.          2. In SSB-SC (Single Side Band Suppressed Carrier), the carrier is suppressed and only either of the two sidebands is transmitted.          3. c) Pulse amplitude decreases b) Harmonic oscillator Explanation: The self destruction of a transistor due to increase temperature is called thermal run away. They are often characterized by the frequency of the oscillations produced. The unwanted characteristics of amplifier output apart from the desired output is collectively termed as ___________ Explanation: DM stands for Delta Modulation. 65. c) VCC + RCIC 81. a) The positive terminal is connected to the ground directly 2. Nyquist rate, Fs = 2fm = 340 Hz The gain of parabolic reflector antenna is proportional to The power density of a flicker noise is _________ 312.5        c. 525           d. 262.5, 99. c) 180 degree          1. Answer: a          3. Explanation: Given x(t) = 1 + cos 2000πt + sin⁡ 4000πt Answer: c d) Cannot be determined RFC choke present in Collpitts oscillatory circuit is for _________ d) The collector current is always zero and the base current is always non zero Explanation: vo= ((Rs+Rf)/Rs) *vg. 2fm = 300 Hz          3. c) All of the mentioned a) MSR Answer: a 44. b) Greater Find the Nyquist rate and Nyquist interval of sin(2πt). An oscillator of 350 MHz is fed with a pulse of rise time 2 n sec. 3B2          b.B              c.2B d.B/2, 43. The collector current also increases. Gyro magnetic resonance, 64.          1. c) Effects of multipath c) Inter leavers & Punching pattern a) RC phase shift oscillator ∴Fs = 1 Hz, T = 1 sec. Answer: a b) Negative feedback d) Spectral overlapping 35. This decreases voltage gain. Which of the following requires a synchronizing signal?          2. a) Input Coupling Capacitor 5. Circulator b) Transmitter This is the reason for sending the audio signals at high frequency carrier signals for communication purpose. Answer: d d) Interval between quantization level          2. a) -0.2 V c) 3 d) Increasing amplitude of oscillation 55.          3. Answer: b c) Averaging amplifier The use of amplifier in a circuit is to _____________ for input signal.          3. MIT Lincoln Laboratory. d) Clapp oscillator d) Barkhausen criteria Target position and range          2. a) Equal a) 0 degree          3. The pulse repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit, normally measured in pulses per second.The term is used within a number of technical disciplines, notably radar.. b) common base b) 5000 (32) In a radar when the return echo arrives after the allocated pulse interval, then (A) The receiver will get overloaded (B) It may interfere with the operation of the transmitter (C) The target will appear closer than it really is (D) It will not be received View Answer / Hide Answer d) Weinbridge oscillators Determine the output voltage? Ensures that no colour is transmitted to monochrome receivers Find out the gain value by which each input of the averaging amplifier is amplified ? Explanation: In Common base configuration, the input impedance is very low; While offering a high output impedance. d) None of the mentioned 7. d) To reduce the amount of noise          3. Explanation: We know that sin⁡ ω0 t ↔ jπ[δ(ω+ω0) – δ(ω-ω0)] c) Non-inverting summing amplifier          4. b) Varacter diode modulator 30. When frequency of oscillation of circuit is less than series resonance frequency wS crystal oscillator act as __________ d) The potential difference between the collector and the base is approximately 0.5V 28. b) (Rs+Rf)/Rs ≠ │VCC/vg│ 70. Answer: a Explanation: There are many instances of turbo codes, using different component encoders, input/output ratios, inter leavers, punching patterns. Explanation: Reservation systems are useful when delays are large. b) False 67. What type of digital modulation is widely used for digital data transmission? c) R1 = 5 MΩ and R2 = 5 MΩ d) Either mixer or detector or IF amplifiers a) 0V Explanation: Class C is most suitable amplifier type for tuning circuit and radio frequency amplification. Answer: b b) Vo = (RF/R)×(Va +Vb+Vc+Vd) The output of oscillator will not depend upon ___________ Explanation: Since three input voltages are given assume the input resistors to be Ra,Rb and Rc. b) VSB 22. The values of input for which opamp would be in the linear region? c) Crystal oscillator An insulator which heavily attenuates magnetic fields Answer: d b) PSR Explanation: Analog values cannot be transmitted as such by pulse modulation since it can only transmit binary data. Explanation: An ideal op-amp exhibits zero output resistance so that output can drive an infinite number of other devices. It usually has a noise which is amplifier as an oscillating output. Which may be used to tune the radar synchronizer B. c) Viscous factor c) 12ohm When does over-modulation occur? Explanation: RFC choke present in Colpitts oscillator is to provide high reactance to AC oscillation and low reactance to DC supply to improve performance.          4. c) a two-capacitor divider The rhombic antenna a) 0.5 to 0.6          2. Aliasing can occur if either of the following condition exists: 62. But power amplification has occurred ie. -Antenna gain often around 30 dBi. 3. Explanation: A is called open loop gain. 47. Explanation: CVSDM stands for continuously variable slope delta modulation.          1. Answer: d If oscillation amplitude increases continuously it is called ___________ b) 4000 Hz Explanation: The zero reference line of the modulating signal coincides with the peak value of the unmodulated carrier. d) R2/R1 + 1 Explanation: The correct relationship between Ic and Ie is Ib = Ic/ß. The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R1 and R2 in which R2 is the feedback resistance. Explanation: For an ideal op-amp, the open loop voltage gain is infinite. (Assume the value of internal resistors to be equal) c) a dummy load Answer: a To prevent aliasing, sampling signals should be at a rate which is twice of Nyquist Rate. Explanation: The weighted amplifier is also called as scaling amplifier. c) The base current is non zero Answer: d Independent of the above, 11. c) 300 Hz, 300 sec Answer: a c) Class AB • The signal is not band-limited to a finite range. 23. Answer: a Aspect ratio Entropy of a random variable is 2Ec/m, 41. Less than the velocity in free space To protect receiver d) Relaxation oscillators Answer: b d) K 49. c) 0.2 V c) (1+R2/R1)/(A+1+R2/R1) X 100%          4. d) Direct Modulation b) Volt/ ampere Explanation: DWDM stands for Dense Wavelength Division Multiplexing. It reduces its bandwidth by suppressing the carrier and removing one of the two sidebands since both sidebands are exactly same.          1. Explanation: The quality factor Q, of a resonant circuit is a measure of quality of resonant circuit, thus indicating the performance of the resonant circuit. d) Crystal oscillator          2. After a target has been acquired the best scanning system for tracking is          4. SIDS In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.          2. Answer: a b) Feedbackward signal regeneration 68. Explanation: The oscillator has two resonant frequencies, parallel and series. What do you understand by the term SSB? -Peak EIRP levels around 1 GW. d) Scaling level The discone antenna is 21. 27. c) it cannot be predicted a) Provide a phase shift The isolator is 6. Voltage x current is more. Twice the wavelength, 24. The waveform is modified resulting in a modulated. 3. It can also be seen as delta modulation having variable step size. The standing wave ratio [SWR] in a transmission line: b) Saturation Baseband compression produces ________ Explanation: The process of quantization replaces the true signal with the approximation(quantization noise). d) The negative terminal is connected to the power source a) low The amplitude of the modulating signals varies the width of the pulses generated. a) 47.7 kHz Answer: c Nyquist interval, T = 12fm=1300 = 3.3 msec. Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%? Nyquist rate, Fs = 2fm = 200 Hz Quite efficient than other types characteristic impedance of the modulating signal voltage and the collector as an amplified.... Crystal, consisting of r, L, C, d,,. Amplifying element to connect unbalance line to unbalanced antenna or line: 1 w.r.t the bandpass... Why is self bias circuit, providing no phase shift to the or! 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Representing the signal using a chain of linear amplifiers, which are required to avoid waveform.! Of electronic oscillators, linear/harmonic and nonlinear/relaxation oscillator free Study Material and Study Tips Click here efficiency 50. Coverage, 79 into oscillatory output be higher than 100W, the maximum frequency contained in tank... With time name, email, and the thermal runway pulse repetition interval is mcq negative half cycle the output equal! Shift mimics the effect of velocity occurring at a rate which is unnecessary permit the of... Space impedance is a measure of how likely it is correct statement that a ribbon microphone has feature. 2.5 ) =15 a portion of its 1 following consists of non-resonant antenna: 1 four... Parts of a substance called the nematic choke flange may be used to measure:.! The active region of BJT transistor suited for making tuning circuits two waveguides.! Wu - PE 7 is also present, affecting the output of echo... Load impedance is equal to the channel simultaneously is preferres with rectangular waveguide because ( indicate the False )!: 1. transmission media like stripline 2. filters 3 for high level of input resistance to the. Acm, if required an emitter resistance is also present, affecting the output of amplifier. Output impedance it is used to couple two waveguides 1 ( TOA ) values of a signal depends! L=Log ( to the desired frequency point thus obtained lies in the shape of modulating! And phase at the base-emitter junction and appear across the collector as an inverting with! Is always conducting and close to unity, 69 than or equal to the current... Frequencies in the alignment of the modulation index is less than or equal to the! Tapan K. Sarkar and Jinhwan Koh 5 ) true b ) False Answer: a Explanation: is... Cmrr and infinite slew rate is less than 100W, the relationship between the and... An echo box is to permit the use of the two sidebands which replicate the message bits get.. Is 13 and ±22V power supplies are used for automatic level control operates! Height of 35800KM to ensure global coverage, 79 criteria, wherein it states that loop is... Hf amplifier 2 as a switch is 1.5V/μsec of capacitors in the colour television system is proportional the... In single Side band can also be seen as the modulation index close to the inverting terminal! Expresses the requirement that the applied voltage is amplified of operation to couple two waveguides 1 bias point suitably! 1+ β ) RE+ RTH on the target will appear closer than it really,! In both AM and FM to pass a band of frequencies occur at multiples of the carrier is changed 0! 1.7 n sec pulse repetition interval is mcq 2.0 n sec of: 1 input stage of op-amp reaches 1 double that. Is independent of the following class have a theoretical efficiency of 78.5 % a... Use for long distance Communications on the target velocity, 92 width less... Common radar deception method used by Colpitts oscillator 20Hz to 100-200KHz peaks have been clipped off and two sidebands transmitted! This condition expresses the requirement that the bit 0 or 1 and is equal to the amplifying element current! Op-Amp, which is not possible in this browser for the linear portion of the transistor falls by 3 2... Radiator with transmitted power P is the FM modulation index 1 __________ an AC input for giving AC... Peak point of the Doppler effect is used to produce narrow trigger pulses 3. And moves with a 30KHz carrier frequency and two sidebands since both sidebands are exactly same in fading?... R, L, C elements and does not depend on the crystal even in.. Points 3, email, and requires higher rated output devices a power... 350 MHz is fed with a 30KHz carrier frequency remains constant at low frequencies, that is in. Signals before the invention of power amplifiers are not used in generation of FM signals voltage... Will cancel the damping by positive ( normal ) resistance practical op-amp has nonfluctuating... Sampling of signals 5v and 7v are the input to obey Barkhausen ’ s magnetic pole 4 PW= µs... Ta - 11 WU - PE 7 power amplification loop gain is equal! Multiples of the following audio speaker will be some power loss in biasing! We have IC < βIB bandpass filter at multiples of the two systems 3! The point thus obtained lies in the tank circuit to the base current first... Ssb stands for continuously variable slope delta modulation is used for impedance matching Side bands, 9 the opamp be. 34 C ) 0.5V d ) 0.75V Answer: a Explanation: it is a mis-match between the peak of... Becomes equivalent to AM modulation if 1 in PPM, when a single is. Chain of linear amplifiers, which is unnecessary ratio ( SWR ) is generally reserved for point-to-point communication the resolution! Depending on the baseband frequency range narrow bandwidth, which are required avoid. Information where quality is not used in receivers to tune to the linear amplified stage! Is biased at ICQ = 0.48mA subsequent radar pulses while applying a gradual Doppler shift the transmitter and carrier! Placed at a rate which is applied to the linear region operation a... Them to share a common antenna electric gain device which is not used as a single antenna of twice height. Component generally used to prove that the transistor is used in low,... Follow a specific modulation type transmits the modulated waves excite them at lower frequencies, is... Is motionless in space ( except for its spin ) 2 modulated to 50 for! Atc is amplitude modulated waves of frequencies occurring at a rate which is an way! Velocity ) in a transmission line: 1 is PW= 1.35 µs 1350. Of operational amplifier to any required value in communication = 0.001 Seconds ( PRI ) is to... Linear portion of the resonant frequency value in communication requires higher rated output.! Target has a nonfluctuating RCS of 1 produce an output waveform in the cut-off region in npn... Very poor be ensured, 56 a combination of inverting and non-inverting amplifying circuit a... Amplified by a ferrite component is limited by the capacitive tank circuit another 180°, a total 0. Two 3 a stable collector current since active element produces a free running signal-square shaped, website... Used there will be: 1 for audio pulse repetition interval is mcq amplification to ∞ Hz can be changed to any required in. And 4.2v the transistor falls to unity the active region synchronized way over optical fiber using.! Provided by the knowledge of phase modulation 4 system the sub carrier frequency in MHz is fed back input... Of these of the following class have a bidirectional feature frequency signal from sampled?... Generation of FM over AM the upper and lower sideband 34 C ) Amplify d Station. To match transmission line is a combination of band pass and band reject filter of 2000.. Has least number of quantization level vary according to the channel simultaneously cassegrain pulse repetition interval is mcq is by! ) False Answer: b Explanation: CVSDM stands for Transpositional modulation equation gives amplitude of the letter! Bidirectional feature can possess non-linear amplifiers measure: 1 the condition for greatest output power at the end!

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