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 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 : Stacking antenna elements A. increases sensitivity to weak signals B. will suppress odd harmonics C. decrease signal to noise ratio D. increases selectivity
Last Answer : A. increases sensitivity to weak signals
Description : The use of telecommunication for the transmission of signals to initiate, modify or terminate functions of equipment at a distance. A. Tracking B. space command C. Telecommand D. Trunking
Last Answer : C. Telecommand
Description : The use of telecommunication for the transmission of signals to initiate, modify or terminate functions of equipment at a distance. A. Tracking B. Telemetry C. Telecommand D. Space telemetry
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 : 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 : Which set of truth table input signals will result in an output signal value of 1 from the 'AND' gate as shown in the illustration? EL-0035 A. 1-Jan B. Jan-00 C. 0-1 D. 0-0
Last Answer : Answer: A
Description : As shown in the illustration, which set of truth table input signals will result in an output signal at point 'Y'? EL-0035 A. 0-0 B. 0-1 C. Jan-00 D. 1-Jan
Last Answer : Answer: D
Description : What is the purpose of either 'setpoint module' (6000F090/030) shown in the illustration? EL-0094 A. Program the 'signal conditioner' as to how to vary its input. B. Supply 0 - 10 volts to ... . Obtain an input from the 'signal conditioner' and, if outside set limits, signals the 'annunciator'.
Description : Write the four ways of adding an impedance to an existing system so as to modify bus impedance matrix.
Last Answer : 1. Adding a branch of impedanceZb from a new bus p to the referance bus. 2. Adding a branch of impedance Zb from a new busp to an existing bus. 3. Adding a branch of impedance Zb from an existing busq to the referance bus. 4. Adding a branch of impedance Zb between two existing buses h and q.
Description : A common-emitter circuit has an input voltage of 0.1 volt, an output voltage of 2.0 volts, an input current of 0.5 milliamps, and an output current of 10 milliamps. What is the power gain? A. 20 B. 40 C. 400 D. 4000
Last Answer : Answer: C
Description : An operational amplifier, as used in today's consoles, has a calculated gain of 5. This means that when the input changes _____________. A. 5 volts, the output changes 10 volts B. 10 volts, the output changes 5 volts C. 2 volts, the output changes 10 volts D. 10 volts, the output changes 2 volts
Description : When troubleshooting an amplifier, you measure an output of 30 volts. If the gain of the amplifier is 2, what must the input voltage be for the amplifier to work properly? A. 32 volts B. 30 volts C. 28 volts D. 15 volts
Description : A disadvantage of using the configuration in the illustrated circuit is _________. EL-0045 A. no current gain B. high input resistance C. high voltage gain D. becomes unstable with an increase of ambient temperature
Description : The advantage of using the illustrated circuit configuration is _________. EL-0045 A. high input resistance B. high current gain C. the best stability with an increase in temperature D. the input and output are 180 degrees out of phase
Description : An operational amplifier, as used in today's consoles, may have a calculated gain of 5. This means that as the input changes by ______________. A. 1 volt, the output changes 5 volts B. 5 volts, the output changes 1 volt C. 5 volts, the output changes 10 volts D. 10 volts, the output changes 5 volts
Description : The device in figure 'B' shown in the illustration can be used to control an AC load yet maintain its high gain by ______________. EL-0091 A. connecting the load to the output side of the ... connecting the load to the input side of the bridge D. reversing the current flow through the bias winding
Description : Basic operating characteristics of the operational amplifier such as gain and stability are the function of its _____________. A. differential input stage B. power output stage C. feedback circuit D. supply voltages
Description : Operational amplifiers, used primarily in analog circuits, are characterized by ____________. A. high input impedance, high gain and low output impedance B. high input impedance, high gain and high output ... gain and high output impedance D. low input impedance, high gain and low output impedance
Description : The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Ω input resistor, a 1600Ω equivalent noise resistance and 27kΩ output resistor. For the second stage, these values are 25, 81kΩ, 19kΩ, and 1MΩ, ... this two stage amplifier. A. 2,518 kΩ B. 2,518 Ω C. 251.8 Ω D. 12,518 Ω
Last Answer : B. 2,518 Ω
Description : Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition. (A) ∂/∂t = 0 (B) ∂/∂t = constant (C) ∂/∂s = 0 (D) ∂/∂s = constant
Last Answer : (C) ∂/∂s = 0
Description : Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition. (A) ∂/∂s = 0 (B) ∂/∂t = 0 (C) ∂/∂s = constant (D) ∂/∂t = constant
Last Answer : (B) ∂/∂t = 0
Description : In lag compensator the damping ratio, gain and steady state error (ess) are (a) Decreases, Decreases and Increases (b) Decreases, Increases and Increases (c) Increases, Increases and Decreases (d) Increases, Decreases and Decreases
Last Answer : In lag compensator the damping ratio, gain and steady state error (ess) are Increases, Decreases and Decreases
Description : On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal. (A) Frequency (B) Amplitude (C) Damping (D) None of these
Last Answer : (A) Frequency
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 : A temperature instrumentation system for an engine room console consists of a resistance temperature detector (RTD), a measuring bridge circuit, and a meter (or alarm circuit).Which of the following ... is zero. D. The input voltage of the resistance bridge is the constant temperature signal.
Description : In the illustrated amplifier, the RESET potentiometer A1R2 sets the stability of the control loop by changing the reset time constant. As the potentiometer is turned clockwise _________. EL-0060 A. ... is increased to the summing point at terminal 5 D. response time is increased decreasing stability
Last Answer : Answer: B
Description : Which of the following statements are TRUE for damped vibrations? (P) . For a system having critical damping, the value of the damping ratio is unity and system does not undergo a vibratory motion. (Q) . Logarithmic decrement method ... Q only (B) P and S only (C) P, Q and R only (D) Q and S only
Last Answer : (C) P, Q and R only
Description : A vehicle suspension system consists of a spring and a damper. Stiffness of spring is 3.5 KN/m and damping constant of damper is 400Ns/m. If mass is 50 kg, then damping factor is A 0.606 B 0.10 C 0.666 D 0.471
Last Answer : D 0.471
Description : A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural ... , are a) 0.471 and 1.19 Hz b) 0.471 and 7.48 Hz c) 0.666 and 1.35 Hz
Last Answer : a) 0.471 and 1.19 Hz
Description : find the value of logarithmic decrement of a vibratory system if its natural frequency is 10rad/sec, its mass is 10kg and its damping constant is 100N.s/m a) 36.27 b)362.7 c)0.3627 d)3.627
Last Answer : d)3.627
Description : Find the equivalent damping constant of the system shown in Fig. for c1=22N.s/m and c2= 11N.s/m a) 40 N/m 2 b)38 N/m 2 c)44 N/m 2 d)8.8 N/m 2
Last Answer : c)44 N/m 2
Description : A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural ... .19 Hz b) 0.471 and 7.48 Hz c) 0.666 and 1.35 Hz d) 0.666 and 8.50 Hz
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 : Who discovers neutrino oscillations ?
Last Answer : Neutrino oscillation was discovered by scientist Takaki Kazita.
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 : 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 : What method is used to prevent oscillations in large synchro units?
Last Answer : Mechanical damping.
Description : What are the three requirements necessary for oscillations to exist in a circuit?
Last Answer : Amplification, regenerative feedback, and frequency-determining device.
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 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