Description : What method is used to prevent oscillations in large synchro units?
Last Answer : Mechanical damping.
Description : What starts the oscillations in a negative-resistance magnetron?
Last Answer : The application of the proper magnetic field.
Description : A magnetron will produce oscillations when the electrons follow what type of path?
Last Answer : Circular.
Description : What are the requirements for an integration circuit?
Last Answer : The time constant is long and the output is taken across the capacitor in an RC circuit.
Description : Name the two series circuits that exist in a diode circuit.
Last Answer : Filament and plate.
Description : What type of switch is used if it is necessary to guard against a circuit being accidentally turned
Last Answer : A locked-position switch.
Description : What are the three basic requirements for sound?
Last Answer : A source, medium, and detector (receiver).
Description : What are the three requirements for a wave to be propagated?
Description : What are the three requirements for an operational amplifier?
Last Answer : . Very high gain, very high input impedance, very low output
Description : What are the three fundamental requirements of a military communications system?
Last Answer : Reliability, security, and speed.
Description : What are the three requirements for an AM demodulator?
Last Answer : (1) Sensitive to the type of modulation applied, (2) nonlinear, and (3) provide filtering.
Description : What are the three requirements for cw transmission?
Last Answer : A method of generating oscillations, a method of turning the oscillations on and off (keying), and an antenna to radiate the energy.
Description : Who discovers neutrino oscillations ?
Last Answer : Neutrino oscillation was discovered by scientist Takaki Kazita.
Description : A student measures time for 20 oscillations of a simple pendulum as 30 s. 32 s, 35 s and 31 s. 1f the minimum division in the measuring clock
Last Answer : A student measures time for 20 oscillations of a simple pendulum as 30 s. 32 s, 35 s and 31 s. 1f the minimum ... 1 (C) 32 2 (D) 32 5
Description : Comparing L-C oscillation with the oscillation if spring-block-system, match the following table. Comparing L-C oscillations with the oscillations of
Last Answer : Comparing L-C oscillation with the oscillation if spring-block-system, match the following table. Comparing L-C ... ,x),(,,,(T),"None"):}`
Description : What are the conditions for oscillations?
Last Answer : There are three conditions. These include positive feedback, thephase near the circuit needs to be either 36 or zero degrees, andthe loop gain should be equal or greater than 1.
Description : For short-term climatic predictions, which one of the following events, detected in the last decade, is associated with occasional weak monsoon rains in the Indian subcontinent? [IAS 2002] (a) La Nina ( ... of jet streams (c) El Nino and southern oscillations (d) Green-house effect on global level
Last Answer : Ans: (c)
Description : A control system with excessive noise, is likely to suffer from (a) saturation in amplifying stages (b) loss of gain (c) vibrations (d) oscillations
Last Answer : Ans: A
Description : The second derivative input signals modify which of the following? a) The time constant of the system b) Damping of the system c) The time constant and suppress the oscillations d) The gain of the system
Last Answer : Ans: C
Description : Which of the following phenomena is supposedly associated with global warming? (1) Southern Oscillations (2) El Nino (3) La Nino (4) El Nino Modiki
Last Answer : (4) El Nino Modiki Explanation: El Nino Modiki is associated with global warming.
Description : When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.
Last Answer : D. internal receiver noise.
Description : Vibrations in the tubes of a shell and tube heat exchanger is induced due to the (A) Flow of fluid on the tube and shell sides (B) Oscillations in the flow of shell/tube sides fluid (C) Vibrations ... piping and/or supports due to external reasons (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : The rate of decay of oscillations is known as....... A. critical damping B. damping coefficient C. transmissibility D. logarithmic decrement
Last Answer : D. logarithmic decrement
Description : Negative damping leads to a. instability b. fast convergence c. oscillationsNegative damping leads to a. instability b. fast convergence c. oscillations
Last Answer : a. instability
Description : Magnitude of earthquake indicates amount of a) Vibrations per second b) Vibrations per minute c) Oscillations d) Energy released
Last Answer : d) Energy released
Description : During secular variation of magnetic meridian at different places (A) Range of oscillations is constant (B) Period of oscillation is constant (C) Range and period of oscillation both vary (D) Period of oscillation only varies
Last Answer : (C) Range and period of oscillation both vary
Description : What is Gibbs phenomenon? Or what are Gibbs oscillations?
Last Answer : One possible way of finding an FIR filter that approximates H(ejw) would be to truncate the infinite Fourier series at n= + (N-1)/2. Abrupt truncation of the series will lead to oscillation both in pass band and in stop band. This phenomenon is known as Gibbs phenomenon.
Description : For small oscillations, what happens to the period of a simple pendulum when the mass of the pendulum bob is doubled?
Last Answer : ANSWER: NOTHING or PERIOD IS UNAFFECTED
Description : Which of the following phenomena is supposedly associated with global warming ? (1) Southern Oscillations (2) El Nino (3) La Nino (4) El Nino Modiki
Last Answer : El Nino Modiki
Description : State the Barkhausen criteria of oscillations
Last Answer : Barkhausen's Criteria - To obtain sustain oscillation the loop gain AB = 1 and phase shift of feedback signal should be 00 or 3600 of an amplifier. it is called as barkshausen's ... Wien bridge oscillator LC Oscillator Hartley oscilator Colpitts oscillator Crystal oscillator
Last Answer : An Oscillator produces Undamped oscillations
Description : What are the basic requirements for any splice or terminal connection?
Last Answer : The connection must be both mechanically and electrically as strong as the conductor or device with which it is used
Description : What type of tube best meets the requirements of a modulator switching element?
Last Answer : Thyratron.
Description : What basic circuits meet the requirements of an externally synchronized master oscillator?
Last Answer : Sine-wave oscillator, single-swing blocking oscillator, and master trigger (astable) multivibrator.
Description : Training requirements for (2M) repair personnel were developed under guidelines established by what organization?
Last Answer : Chief of Naval Operations (CNO).
Description : When you replace components, identification marks must meet what requirements?
Last Answer : They should be readable from a single point.
Description : Who is responsible for meeting environmental and electrical requirements of a system?
Last Answer : Equipment designers (planners).
Description : In what publication are environmental requirements for equipment defined?
Last Answer : Procurement specifications.
Description : Which of the above requirements is most important?
Last Answer : . Reliability.
Description : What term is used to identify each of the many field configurations that can exist in waveguides?
Last Answer : Mode of operation.
Description : For an electric field to exist at the surface of a conductor, the field must have what angular relationship to the conductor?
Last Answer : The field must be perpendicular to the conductors.
Description : . What primary condition must magnetic lines of force meet in order to exist?
Last Answer : Magnetic lines of force must form a continuous closed loop.
Description : What logic levels must exist for the FF to be toggled by the clock?
Last Answer : Both J and K must be HIGH.
Description : State one requirement of an electron tube, which does not exist for semiconductors, that makes the tube less efficient than the semiconductor.
Last Answer : The electron tube requires filament or heater voltage, whereas the semiconductor device does not; consequently, no power input is spent by the semiconductor for conduction.
Description : What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?
Last Answer : The traveling wave must have a forward velocity equal to or less than the speed of the electrons in the beam.
Description : Why is it important to minimize TBE jitter in magnetic tape recordings where precise timing relationships exist between two or more signals?
Last Answer : The jitter could cause noise and a loss of accuracy.
Description : How many input combinations exist for a four-input AND gate?
Last Answer : 16.
Description : Modes that are bound at one wavelength may not exist at longer wavelengths. What is the wavelength at which a mode ceases to be bound called?
Last Answer : Cutoff wavelength