Description : Draw RC differentiator circuit.
Last Answer : RC differentiator circuit :
Description : With the help of circuit diagram and waveforms, explain working of RC differentiator.
Last Answer : Fig: RC differentiating circuit Figure shows a RC differential circuit. It is also known as high pass filter. The reactance of a capacitor decreases with increasing frequency. The higher ... i.e. the output signal is directly proportional to the derivative of the input signal.
Description : What are the limitations in a temperature compensated zener-reference source?
Last Answer : A power supply voltage of atleast 7 to 10 V is required to place the diode in the breakdown region and that substantial noise is introduced in the circuit by the avalanching diode.
Description : What are the advantages and limitations implantation of ion implantation?
Last Answer : Advantages: • Accurate control over doping • Very good reproducibility • Precise resistance value • A room temperature process Limitations: • Annealing at higher temperature is required for avoiding the crystal damage • The possibility of dopant implanting through various layers of wafer.
Description : Which of the following is the basic synthesizer circuit? A. Frequency divider B. Frequency multiplier C. PLL D. Mixer
Last Answer : C. PLL
Description : increases the steady state accuracy. (a) Integrator (b) Differentiator (c) Phase lead compensator (d) Phase lag compensator Ans:A 10.As a result of introduction of negative feedback which of the following will not decrease ? (a) Band width (b) Overall gain (c) Distortion (d) Instability
Last Answer : Ans: A
Description : What is the difference between an RC and an RL differentiator in terms of where the output is developed? is developed?
Last Answer : . In an RC circuit the output is taken across the resistor. In the RL circuit the output is taken across the inductor.
Description : State the condition for RC differentiator. Draw the output waveform of RC integrator for square wave input.
Last Answer : Condition for RC differentiator: If the time duration T of the input waveform is comparable with the RC time constant (product of R and C) then the output waveform of the differentiator gets distorted. Hence for proper differentiator the condition is as follows: T >>RC
Description : Compare Integrator and differentiator.
Last Answer : Sr. No. Integrator Differentiator 1 A circuit that gives an output voltage directly proportional to the integral of its input is known as an integrating circuit. A circuit that gives an output voltage directly ... is a low pass filter. It is a high pass filter. 5
Description : Compare RC integrator with RC differentiator
Last Answer : Compare RC integrator with RC differentiator
Description : A differentiator is not usually used in control system, because it : - (A) reduces damping (B) increases error (C) reduces gain margin (D) increases input noise
Last Answer : A differentiator is not usually used in control system, because it : - increases input noise
Last Answer : In an op-amp differentiator the amplitude of output is proportional to rate of change of input.
Last Answer : A differentiator is usually not a part of a control system because it increases input noise.
Description : The following statements relate to the auditor's responsibility for the detection of errors and fraud. Which of the statement is correct? I. Due to the inherent limitations of the audit, there is a possibility that ... . a. I only b. II only c. Both statements are true d. Both statements are false
Last Answer : Both statements are true
Description : What is the basic technique used to stabilize a satellite? A. Gravity-forward motion balance B. Spin C. Thruster control D. Solar panel orientation 62. The jet thrusters are usually
Last Answer : B. Spin
Description : In ISDN, what is the basic access B channel data rate? A. 32 kbps B. 64 kbps C. 144 kbps D. 16 kbps
Last Answer : B. 64 kbps
Description : Which of the following is the basic component of a communications satellite receiver? A. On-board computer B. Reflector C. Telemetry D. Transponder
Last Answer : D. Transponder
Description : How many telegraph channels are there in the basic voice band channels? A. 24 B. 96 C. 48 D. 672
Last Answer : A. 24
Description : The basic voice band has how many octaves? A. 10 B. 4 C. 5 D. 3
Last Answer : B. 4
Description : One of the following is a high powered RF ac basic transmitter that has two or more stages, the oscillator stage which determines the frequency opereation and RF amplifier stage orstages that develop the ... to develop a good frequency stability. A. Goldsmith B. MOPA C. Alexanderson D. Hartley
Last Answer : B. MOPA
Description : Main basic components of a data communication are composed of the following. A. Computer, modern and router B. Computer, bridge and gateway C. Transmitter, channel and receiver D. Transmitter, computer and modem
Last Answer : C. Transmitter, channel and receiver
Description : Determine from the following the basic mode of transmission system in the public data network in which data are transferred from the source to the network and from the network to the destination in the frame format. A. Voice mode B. Asynchronous mode C. Synchronous mode D. Packet mode
Last Answer : D. Packet mode
Description : What is the basic qualification of an applicant for public carrier network before a certificate of public convenience or a provisional authority is issued? A. Franchise B. SEC document C. Business permit D. Radio station license
Last Answer : A. Franchise
Description : A major and basic advantage for the use of a klystron. A. High power B. Efficiency C. Lesser noise D. Cheaper
Last Answer : A. High power
Description : The basic law providing for the regulation of radio station, communications in the Philippines and other purposes. A. Act. No.`3846 B. D.O. No. 11 C. D.O. No. 88 D. D.O. No. 5
Last Answer : A. Act. No.`3846
Description : What equation defines the composition of an ISDN basic access line? A. B+2D B. B+D C. 2B+2D D. 2B+D
Last Answer : D. 2B+D
Description : Basic speed rate of digital system. A. 144 kbps B. 1,544 kbps C. 64 kbps D. 2,048 kbps
Last Answer : C. 64 kbps
Description : What is the basic building block of an op-amp?
Last Answer : The basic building block of an op-amp is differential amplifier.
Description : What are the basic rules of an operating amplifier?
Last Answer : The operating point should be fixed on the load line. The upper end of the load line lies on the saturation region &lower end lies on the cutoff region.
Description : What is the data rate of the ISDN Basic access B channel? A. 192 kbps B. 32 kbps C. 64 kbps D. 144 kbps
Description : What is the baseband frequency of standard FDM basic supergroup? A. 312 to 552 kHz B. 300 to 600 kHz C. 60 to 2540 kHz D. 60 to 108 kHz
Last Answer : A. 312 to 552 kHz
Description : Which one is not the basic electrical protection measures in the Philippine Electronics Code? A. Voltage/ current limiting and interrupting B. Undergrounding C. Grounding and bonding D. Shielding
Last Answer : B. Undergrounding
Description : List the basic building blocks of PLL
Last Answer : 1.Phase detector/comparator 2.Low pass filter 3.Error amplifier 4.Voltage controlled oscillator
Description : Write the basic chemical reaction in the epitaxial growth process of pure silicon.
Last Answer : The basic chemical reaction in the epitaxial growth process of pure silicon is the hydrogen reduction of silicon tetrachloride. 1200C SiCl4 + 2H2 Si + 4 HCl
Description : What are the basic processes involved in fabricating ICs using planar technology?
Last Answer : 1.Silicon wafer (substrate) preparation 2.Epitaxial growth 3.Oxidation 4.Photolithography 5.Diffusion 6.Ion implantation 7.Isolation technique 8.Metallization 9.Assembly processing & packaging
Description : Which of the following is not a common application of fiber-optic cable? a. Computer networks b. Long-distance telephone systems c. Closed circuit TV d. Consumer TV
Last Answer : d. Consumer TV
Description : When a capacitor is connected in series with a Marconi antenna? A. Antenna open circuit stops transmission B. An inductor of equal value must be added C. No change occurs to antenna D. Antenna resonant frequency increases
Last Answer : D. Antenna resonant frequency increases
Description : A final amplifier of a radio transmitter draws 250 mA of plate current when the plate supply voltage is 1400 volts. If the plate circuit efficiency is 80% and the transmitter is connected to an antenna having a feed impedance of 70 ohms, ... at the feed-point? A. 4.0 A B. 2.2 A C. 1.25 A D. 2.0 A
Last Answer : D. 2.0 A
Description : What circuit is responsible in activating and deactivating adjacent antenna elements in a mobile satellite array? A. Radial divider B. Divider/combiner C. Radial combiner D. Radial multiplexer
Last Answer : A. Radial divider
Description : ___________ is device that measures the internal open circuit voltage of an equivalent noise generator having an impedance of 600Ω and delivering noise power to a 600 Ω load. A. Psophometer B. Barometer C. Reflectometer D. Voltmeter
Last Answer : A. Psophometer
Description : Which circuit contributes most of the noise in a receiver? A. IF amplifier B. Demodulator C. AF amplifier D. Mixer
Last Answer : D. Mixer
Description : The noise figure of the first circuit in tandem connection is 10.5 dB while its power gain is 15, what is the over all noise figure if the second circuit has a noise figure of 11 dB? A. 11.59 dB B. 11.23 dB C. 10.79 dB D. 10.5 dB
Last Answer : C. 10.79 dB
Description : _________ is measured on a circuit when it is correctly terminated but does not have any traffic. A. White noise B. Galactic noise C. Impulse noise D. Atmospheric noise
Last Answer : A. White noise
Description : A particular circuit that rids FM of noise A. Detector B. Discriminator C. Phase Shifter D. Limiter
Last Answer : D. Limiter
Description : Which circuit detects frequency modulated signal? A. Modulator B. Discriminator C. Demodulator D. Modem
Last Answer : B. Discriminator
Description : Where is the brightness control located in a TV? A. The audio section B. The video section C. The grid-cathode circuit D. The front panel
Last Answer : A. The audio section
Description : What is the reactance property at the input of a shorted quarter wavelength line? A. A parallel LC circuit B. A pure inductive reactance C. A series LC circuit D. A pure capacitive reactance
Last Answer : A. A parallel LC circuit
Description : What do you call the phenomenon in digital circuits that describe the duration of time a digital signal passes a circuit? A. Transmission time B. Elapsed time C. Propagation delay D. Travel delay
Last Answer : C. Propagation delay
Description : How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage? A. Use new power supply B. Lossen power supply shielding C. Use of regulated power supply D. Use of high capacitor in the supply circuit
Last Answer : C. Use of regulated power supply
Description : What consists the front-end circuit of a VHF TV superheterodyne receiver? A. Mixer, RF amplifier and AFC? B. RF amplifier, Band pass filter and mixer C. Local oscillator, mixer and RF amplifier D. Local oscillator, AGC and antenna
Last Answer : C. Local oscillator, mixer and RF amplifier