Description : How can a peak detector for pam be modified to detect pdm?
Last Answer : By making the time constant for charging the capacitor at least 10 times the maximum received pulse width.
Description : What is the time constant of the resistor and capacitor in a peak detector for pam?
Last Answer : At least 10 times the interpulse period.
Description : The spectrum of a radar transmitter describes what characteristic of the output pulse?
Last Answer : Frequency distribution
Description : The calibration of an HPLC detector can be evaluated by measurement of? A. Retention time B. Temperature C. Flow rate accuracy D. Intensity of the peak
Last Answer : D. Intensity of the peak
Description : Which is the proper measurement of average power emitted by a pulsed laser? a. Energy x time b. Pulse energy x repetition rate c. Pulse energy / repetition rate d. Peak power x pulse length
Last Answer : b. Pulse energy x repetition rate
Description : Given below is the ECG of a normal human. Which one of its components is correctly interpreted below? (a) Complex QRS - one complete pulse (b) Peak T - initiation of total cardiac ... R together - systolic and diastolic blood pressures (d) Peak P- initiation of left atrial contraction only
Last Answer : (a) Complex QRS - one complete pulse
Description : Which is the proper measurement of average power emitted by a pulsed laser? ∙ a. Energy x time ∙ b. Pulse energy x repetition rate ∙ c. Pulse energy / repetition rate ∙ d. Peak power x pulse length
Last Answer : ∙ b. Pulse energy x repetition rate
Description : Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?
Last Answer : An amplifier.
Description : In the output of an ac error detector, what indicates the (a) direction and (b) amount of control necessary for correspondence?
Last Answer : (a) Phase. (b) Amplitude.
Description : An error signal is the difference between what two quantities fed to the CT (error detector)?
Last Answer : Input signal and feedback.
Description : Why is detector saturation not generally a problem in fiber optic communications systems?
Last Answer : Because fiber optic communications systems operate at low optical power levels.
Description : What are the four most common materials used in semiconductor detector fabrication?
Last Answer : Silicon, gallium arsenide, germanium, and indium phosphide.
Description : For efficient operation, should a detector have a high or low responsivity at the operating wavelength?
Last Answer : High.
Description : Describe the operation of an optical detector
Last Answer : It is a transducer that converts an optical signal into an electrical signal. It does this by generating an electrical current proportional to the intensity of incident optical radiation.
Description : What is the function of the detector?
Last Answer : To extract the modulating audio signal.
Description : In its simplest form, what functions must a radar detector be capable of performing?
Last Answer : Detecting the presence of rf energy.
Description : How is a quadrature detector changed when used for phase demodulation?
Last Answer : The quadrature grid signal is excited by a reference from the transmitter.
Description : Name two advantages of the gated-beam detector.
Last Answer : Extreme simplicity, few components, and ease of adjustment.
Description : What condition must exist on both the limiter and quadrature grids for current to flow in a gated-beam detector?
Last Answer : Both grids must be positively biased
Description : What circuit functions does the tube in a gated-beam detector serve?
Last Answer : Limits, detects, and amplifies.
Description : What is the primary advantage of a ratio detector?
Last Answer : Suppresses amplitude noise without limiter stages.
Description : What is the function of an fm detector?
Last Answer : Converting frequency variations of received fm signals to amplitude variations
Description : What is the simplest form of fm detector?
Last Answer : Slope detector.
Description : which components act as the filter network in the diode detector?
Last Answer : C1 and R1.
Description : To what circuit arrangement is a common-base detector equivalent?
Last Answer : A diode detector followed by a stage of audio amplification.
Description : Which junction acts as the detector in a common-base detector?
Last Answer : Emitter-base junction.
Description : How is the output signal developed in the common-emitter detector?
Last Answer : By the collector current flow through R4.
Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?
Last Answer : Emitter-base junction
Description : Under what circuit conditions would the shunt detector be used?
Last Answer : When the input voltage variations are too small to give a usable output from a series detector.
Description : How does the current-diode detector differ from the voltage-diode detector?
Last Answer : The current-diode detector is in parallel with the input and load.
Description : What is the function of the diode in a series-diode detector?
Last Answer : Rectifies the rf pulses in the received signal.
Description : What does the simplest diode detector use to reproduce the modulating frequency?
Last Answer : The modulation envelope.
Description : What three functions does the transistor in a regenerative detector serve?
Last Answer : Oscillator, mixer, and detector.
Description : What simple, one-transistor detector circuit uses the heterodyne principle?
Last Answer : Regenerative detector.
Description : To measure incident power, you must rotate the coupler detector of the wattmeter so that the arrow indicating power flow points toward which end of the transmission line?
Last Answer : Load.
Description : For a loose sand sample and a dense sand sample consolidated to the same effective stress (A) Ultimate strength is same and also peak strength is same (B) Ultimate strength is different but peak strength ... of dense sand is greater than that of loose sand (D) Ultimate strength is same but peak
Last Answer : (C) Ultimate strength is same but peak strength of dense sand is greater than that of loose sand
Description : What component in a blocking oscillator controls pulse width?
Last Answer : Transformer.
Description : In an astable multivibrator, which components determine the pulse repetition frequency?
Last Answer : RC coupling networks.
Description : What signal is used to synchronize the coherent oscillator to a fixed phase relationship with the transmitted pulse?
Last Answer : Coho lock pulse.
Description : In addition to a flat top, what characteristics must a modulator pulse have?
Last Answer : Steep leading and trailing edges.
Description : What controls transmitter pulse width?
Last Answer : The modulator.
Description : The range sweep in a range-gate generator is started at the same time as what other pulse?
Last Answer : Transmitter.
Description : What width is the pulse radiated by fire-control tracking radar?
Last Answer : Very narrow.
Description : Why do 2D air-search radars use relatively low carrier frequencies and low pulse-repetition rates?
Last Answer : Increased maximum range.
Description : When a transmitter uses a high-power oscillator to produce the output pulse, what switches the oscillator on and off?
Last Answer : High-voltage pulse from the modulator.
Description : What term is used to describe the product of pulse width and pulse-repetition frequency?
Last Answer : Duty cycle.
Description : What special requirement is the pulse counting accelerometer designed for?
Last Answer : When digital data is required from an accelerometer.
Description : If the length of the fiber point defect changes with pulse duration, is the OTDR signal deviation a point defect or a region of high fiber attenuation?
Last Answer : A point defect.