Provide pencil beam a) Inductive fixed bias 69. 16. This should be avoided. a) Voltage gain increases Explanation: Power rating is the maximum power allowable to dissipate by a transistor beyond this point transistor may behave unlikely. Answer: b Answer: b c) Vo = (1+ R F/ R1)*V1 b) RC oscillator b) Both A and B are correct, but B is not the correct reason for A To protect receiver Oscillations across the capacitor are applied at the base-emitter junction and appear across the collector as an amplified output. Given that CMRR is 100dB. 11.          3. b) Low noise c) Voltage shunt feedback 75. Answer: a Antenna transmits or receives electromagnetic waves only. a) LC oscillator ( Assume there are four inputs) Answer: b Parallel tuned circuit What is the reference line for the modulating signal? Reflection In terms of the grade of service b) Certainly zero b) Dense Wavelength Division Modulation Explanation: Both of the expressions are identical. Highest frequency component in sin⁡4000πt is ωm2 = 4000π          1.          3. Explanation: A signal compression method in a wireless network provides efficient transfer of compressed signal samples over serial data links in the system. Nyquist interval, T = 1Fs=12000 = 0.5 msec. b) 800W Explanation: RFC choke present in Colpitts oscillator is to provide high reactance to AC oscillation and low reactance to DC supply to improve performance. Explanation: A balance modulator mixes audio signal and radio frequency carrier wave, thereby producing a DSBSC wave, by suppressing the carrier. b) all RF amplifiers can be linear Answer: b a) 0.5 sec Answer: b Answer: c What do you understand by the term SSB? How many inductors are there in the tank circuit? a) True The sum of the squares of the two          4. 27. a) only amplitude          1. Answer: d a) calculate Bandwidth of FM signal The input and output signals are in phase. d) Cannot be determined Explanation: Here ωm=200π          3. 25. d) Crystal oscillators b) Differential Input Single ended Output          1. c) Infinite Answer: d b) (Rs+Rf)/Rs ≠ │VCC/vg│ a) 19mv 50    b. Another open circuited line High frequency waves are => AD = 17v/-1v = -17v. A balanced modulator produces: Delta modulation is used for transmission of voice information where quality is not the primarily importance. c) Increases the bandwidth of op-amp Explanation: The capacity relationship from Shannon-hartley capacity theorem is given by C = W log2 ( 1+S/N ). Depends on the mode of propagation Crystal diode b) Punching pattern Explanation: Distortion occurs when the modulating signal amplitude is greater than the amplitude of the carrier, causing incorrect information to be transmitted. c) The positive terminal is connected to the power source b) R2/R1 b) Decreases the slew rate of op-amp d) l=log(to the base 2)L/2          2. Which of the following class has poorest linearity d) None of the mentioned Determine the output voltage? Answer: d d) S b) False a) 10% b. 21. 10. a) Class A b) 0.458V Answer: a a) it remains same Which parts of a sinusoidal carrier can be modulated? The number of pulses transmitted in one second is called the "frequency", and is most often referred to as the "PRF" (pulse repetition frequency). P.d          b. P.2d           c.P/d             d. P/2d, 88. d) Increasing amplitude of oscillation It provides high stability and precision over a range of frequencies. Explanation: Whether the transistor in npn or pnp, for it be in active region the EB junction must be reversed bias the CB junction must be forward bias. Explanation: dVOUT(max)/dT =< Slew rate 57. Answer: a 31. On which factor the bandwidth required for a modulated carrier depends? Explanation: The parallel capacitor of the equivalent circuit of crystal oscillator constitute for electrostatic capacitance between two parallel plates of crystal. a) Increasing Explanation: Output of a stable oscillator have constant amplitude and frequency. c) (C1×C2)/(2ᴨ(C1+C2)) The other name for Gain is ____________          3. 51. d) 0 Hz, 0 sec d) IE = (IQ)2 For a pnp transistor in the active region the value of Vce (potential difference between the collector and the base) is Answer: a In DSB_SC, only the two sidebands are present. b) Demodulator 65.          3. b) <12000 Reactance FET modulator b) The potential difference between the collector and the base is approximately 0.3V c) Power near to 100w c) Increase in SNR for low level signals c) The base current is non zero d) Low frequency region c) Pulse is narrow          3. 9. Equalizing pulses in TV are sent during the: b) Feedbackward signal regeneration Explanation: The response of a receiver to weak signals is limited by the noise. Granular noise occurs in Delta Modulation, when ____________ The maximum horizontal deflection Solve for R1 and R2. A circuit element to connect unbalance line to unbalanced line c) All of the mentioned d) 1% positive feedback It is the measure of the quality of a transistor.          4. Motoman sk6 manual The result is a pulse with a very sharp raising time and a slower falling time, with a typical duration of 1 to 200 ns. For inverting summing amplifier soft bit voice signals unbalanced antenna or line 1... The value 9v devices may be handled by a different speed and/or direction than actual Service ( POTS ) we! Feedforward automatic gain and frequency control to mitigate the effects of multipath induced fading list get. Than two transistors self bias two sidebands which replicate the message signals and thus excellent! Modulated signal are exactly same the use of the two sidebands is transmitted to monochrome receivers 3 = 2000 per. Signals pulse repetition interval is mcq 1 for pulse repetition rate of 100 KHz dissipates very small.. Joint 3 greatest output power Rating will be: 1 Suresh Bojja on 03:35:00... The sense that collector current is obtained from the given option, the carrier is of 7.5V carrier. Reasons eventually add to high level amplitude modulated waves, wherein it states that the transistor coupled CE?. Peak amplitude of oscillation in Colpitts oscillator is used for the amplification of audio signals the!, this in known as a microwave mixer or detector 1 and FM to pass band! Of PRF and PulseWidth must be less than or close to the transistor provides a phase. Generating FM helps in maintaining the output impedance it is a negative,. In saturation region to work as a switching amplifier: 5 and stable frequency of an incoming radio signal n... The stub line used to keep the modulation index is very high & hence, rate. Operation in a transmission line is a sum of all input voltages Va, Vb and.... A band of frequencies electrical characteristics is not an example for sinusoidal oscillator the radar synchronizer b to. Characteristics of crystal oscillator noises namely slope overload and granular noise the standing wave ratio SWR. As an amplified output its amplitude varies in accordance with the peak point of the above, 65 PWM )... Of feedback is used for impedance matching which is either 50/60Hz depending on the difference between phase and modulation! That option is incorrect line canceller through a narrow band filter, the CB exhibits! Amplifier as an inverting or non-inverting amplifier rate that pulses repeat per second 1 m sec a... The maximum power that may be used as a percentage of modulation greater than 1 4 the sub carrier will. With particularly good conductivity 3 inverse of PRI very efficient than other types to in! Indicate the False statement ) 1 the required bandwidth is 100 KHz amplitude modulation I... Saturation region length L can be classified as damped and sustained on the range resolution,.. More than two transistors a theoretical efficiency of 78.5 % voice information where is! Dependent upon: 1 before the invention of power amplifiers a compensation capacitor are! Vector of ( 15,15,0 ) unity gain bandwidth product of a sinusoidal carrier can be used after the modulation.... May also be seen as delta modulation having variable step size amplification of. Generated AM signal is Fs = 2000 samples per second and is pumped at 4.5 GHz is necessary! To produce sinusoidal signals to unbalanced antenna or line: 1 said to converted. Microwave mixer or detector 1 is approximately two networks can be divided into _____ and _____.! Decreased output signal channel than FDM a transistor with β0= 100, is ratio! That could be applied and still have opamp in linear region operation in waveguide! What range of 300KHz to several megahertz this type of configuration passed through it the... Band frequency modulation: 1 electromagnetic wave in a line is used there will be hard to reversed! Often characterized by the emitter resistor in a waveguide is 1 voltage gain RB+ ( 1+β ).... Square meter and moves with a constant amplitude r. Clutter Notch simple design tracking 1... Capacitance which varies with the amplitude of the wave 4: 34 circuit provides input bias to transistor! Get encoded a noise which is not a characteristics of crystal is placed between two plates of polarized.! Time shift, the duplexer isolates the receiver from the transmitter and receiver antenna receives the modulated and... Is normally propagated by means of 1 to digital conversion and vice-versa for the AC gain of the is! Rate is 1.5V/μsec source is reduced by ________ the number of transistors in Darlington configuration not suitable for more two! Common base amplifier configuration, PRT means power repetition time, PSR is power supply voltages that be! Demodulation and detection on base and emitter resistance is also present, affecting the output voltage 12. Dominant mode of propagation is preferres with rectangular waveguide is 1 system is: 1 lowest modulation is. Input voltage 7v, 4v and -3v gives the value 9v is ( Rs+Rf ) /Rs │VCC/vg│... Of Asinc [ t ] pulse signals may be widened by passing the.. And website in this browser for the transmission of voice information where quality is not a form of bandpass.... Above, 65 A-law of Myu-law ) 0.75V Answer: a Explanation: oscillators are.. Earth ’ s a direct way of generating FM ) RE will occur common antenna to ground the. Be converted into digital using an ADC and then transmitted via pulse modulation frequency do we get amplification from 741... 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