Description : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz
Last Answer : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz
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
Last Answer : Answer: C
Description : The circuit shown in the illustration functions as a ____________. EL-0087 A. pulse trigger circuit for an operational amplifier B. three stage, high gain class 'A' amplifier C. binary ripple counter or shift register D. free running multivibrator
Description : If the output impedance of an amplifier circuit is decreased, what is the effect on the gain?
Last Answer : The gain decreases.
Description : In the inverting configuration, what is the voltage (for all practical purposes) at the inverting input to the operational amplifier if the input signal is a 1-volt, peak-to-peak sine wave?
Last Answer : 0 volts.
Description : What does the term "closed-loop" mean in the closed-loop configuration of an operational amplifier?
Last Answer : The use of degenerative (negative) feed-back
Description : What are the three requirements for an operational amplifier?
Last Answer : . Very high gain, very high input impedance, very low output
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 : 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
Last Answer : Answer: A
Description : The operational amplifier is _______ (a) High gain amplifier (b) high power amplifier (c)high resistance amplifier (d)low resistance amplifier
Last Answer : a) High gain amplifier
Description : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts
Last Answer : An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is 50 micro-volt
Description : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B
Last Answer : In the ideal closed loop operational amplifier, the gain depends on (A) value of the series component (B) value of the feedback component (C) on the operational amplifier itself (D) both A and B
Description : The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit
Last Answer : The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit
Description : What is the bandwidth of an amplifier?
Last Answer : The difference between the upper and lower frequency limits of an amplifier.
Description : What is the advantage of designing a limited bandwidth into a servo amplifier?
Last Answer : Unwanted noise-generated frequencies are rejected
Description : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to
Last Answer : For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to inverse of feedback factor
Description : Calculate the noise figure of the receiver whose RF amplifier has an input resistance of 1000Ω and an equivalent shot-noise resistance of 2000Ω, a gain of 25 and load resistance of 125 kΩ. Given that the bandwidth is 1. ... to an antenna with an impedance of 75Ω. A. 30.3 B. 3.03 C. 303 D. .303
Last Answer : A. 30.3
Description : The front-end of a television receiver, having a bandwidth of 7Mhz, and operating at a temperature of 27˚C , consists of an amplifier having a gain of 15 followed by a mixer whose gain is 20. The ... equivalent noise resistance for this television receiver. A. 8760 Ω B. 875Ω C. 8.76Ω D. 0.876Ω
Last Answer : B. 875Ω
Description : The noise output of a resistor is amplified by a noiseless amplifier having a gain of 60 and a bandwidth of 20 kHz. A meter connected at the output of the amplifier reads 1mV RMS. If the bandwidth of the amplifier is reduced to ... does the meter read now? A. 0.5 mV B. 0.5 µV C. 5.0 mV D. 5.0 µV
Last Answer : A. 0.5 mV
Description : Define gain and bandwidth of an amplifier.
Last Answer : Bandwidth The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A
Description : What category of digital tape recorder is used to record special signals with a bandwidth of less than 500 kHz?
Last Answer : Instrumentation digital tape recorders.
Description : What type of circuit is on card 'A0AA2' at coordinate '29Q' shown in the illustration? EL-0099 A. Operational amplifier B. Digital logic inverter C. Square wave pulse generator D. Binary counter
Description : What can be used to replace the exciter in the circuit shown in the illustration? EL-0101 A. A step-up transformer. B. A rectifier. C. A step-down transformer. D. An operational amplifier.
Last Answer : Answer: B
Description : The voltage at the reference electrode of the circuit shown in the illustration is applied to the input of a/an ______________. EL-0090 A. class A detector whose output drives an ... drives an 2-stage isolation transformer D. magnetic amplifier whose output controls a saturable reactor
Last Answer : Answer: D
Description : The circuit shown in the illustration represents a/an ____________. EL-0085 A. operational amplifier B. Wheatstone bridge C. magnetic amplifier D. power supply
Description : The schematic symbol for an operational amplifier in an analog circuit is a _________. A. circle B. square C. trapezoid D. triangle
Description : The conversion of the throttle command voltage to the signal necessary to achieve the desired shaft RPM is accomplished by the _____________. A. ahead or astern function generator of the ... circuit C. operational amplifiers in the autorotation circuit D. long time constant amplifier circuit
Description : The circuit which changes input signal at output with phase shift of 1800 is called (a) Amplifier (b) operational amplifier (c) switch (d) inverter
Last Answer : (d) inverter
Description : Which of the following methods cannot be used to increase the bandwidth for cascaded RF amplifier stages? A) Wave traps in each stage B) Stagger tuning C) A shunt damping resistor across each tuned circuit D) Doubled tuned transformers with tighter coupling
Last Answer : A) Wave traps in each stage
Description : What is the typical satellite transponder bandwidth? A. 24 MHz B. 500 MHz C. 36 MHz D. 48 MHz
Last Answer : C. 36 MHz
Description : What two methods are used to compensate for the problems that cause low gain in an rf amplifier?
Last Answer : . RF transformers are used and the transistor is neutralized.
Description : If the input-signal-developing impedance of an amplifier is increased, what is the effect on the gain?
Last Answer : The gain increases.
Description : If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?
Last Answer : A step-down transformer.
Description : What happens to the overall gain of a lin-log amplifier as each stage saturates?
Last Answer : Decreases.
Description : In a differential amplifier the differential voltage gain is 500 and the common mode voltage gain is 0.5. The CMRR in dB is (a) 80 (b) 60 (c) 30 (d) 20
Last Answer : Ad - differential voltage gain. Acm- common mode voltage gain CMRR - common mode rejection ratio CMRR = 20log(Ad/Acm) = 60 dB
Description : A tuned circuit has a Q of 100 at its resonant frequency of 500 kHz. Its bandwidth is _____kHz. (A) 50000 (B) 0.2 (C) 600 (D) 5
Last Answer : A tuned circuit has a Q of 100 at its resonant frequency of 500 kHz. Its bandwidth is 5 kHz.
Description : If C4 were removed from the circuit, what would happen to the output of the amplifier?
Last Answer : The output would decrease. (C4 decouples R2 preventing degenerative feedback from R2.)
Description : Can a parallel LC circuit be used as the frequency determining network for an rf amplifier?
Last Answer : Yes.
Description : What component in an amplifier circuit tends to limit the low-frequency response of the amplifier?
Last Answer : The coupling capacitor (C3).
Description : What is the difference between a summing amplifier and an adder circuit?
Last Answer : The adder simply adds the input signals together while the summing amplifier multiplies the sum of the input signals by the gain of circuit.
Description : For what class of operation is the final rf power amplifier of a plate-modulator circuit biased?
Last Answer : Class C
Description : Common basic applications for the operational amplifier include ____________. A. counting, pulsing and clocking amplifiers B. summing, scaling and difference amplifiers C. step-up, step-down and rectifying amplifiers D. all of the above
Description : To provide its unique characteristics to analog circuits, the operational amplifier is made up of a/an ______________. A. voltage amp, current amp and output amp B. input amp, power amp and output amp C. scaling amp, power amp and voltage amp D. differential amp, voltage amp and output amp
Description : One feature of the operational amplifier is that it can have ____________. A. up to ten outputs B. binary coded decimal inputs C. several hundred amps at the output D. inverting and non-inverting inputs
Description : The ideal operational amplifier does not have: (1) Infinite input resistance (2) Infinite output resistance (3) Infinite voltage gain (4) Infinite bandwidth
Last Answer : The ideal operational amplifier does not have: Infinite output resistance
Description : What is the importance of negative feedback in the operational amplifier? (A) It maintains the gain (B) The voltage difference between the input terminals is maintained at a very small value ( ... value (D) The voltage difference between the input terminals is maintained at a very high value
Last Answer : The voltage difference between the input terminals is maintained at a very small value
Description : What is operational amplifier?
Last Answer : Operational amplifier is an amplifier which amplifies the input signal when we pass a low voltage signal .It has two terminals inverting and non inverting. It is an active device because it ... of negative feedback it provides the output waveform similar to the input waveform (truely amplified )
Description : .2.The period of a signal is 10ms. What is its frequency in kilohertz?
Last Answer : 100
Description : What is the wavelength of a radio photon from an A.M. radio station that broadcasts at 1360 kilohertz?
Last Answer : 300 / 1.36 = 220.588 metres (rounded to three decimalplaces).
Description : What does the noise weighting curve shows? A. Noise signals measured with a 144 handset B. Power levels of noise found in carrier systems C. The interfering effect of other frequencies in a voice ... a reference frequency of one kilohertz D. Interfering effects of signals compared with a 3-kHz tone
Last Answer : C. The interfering effect of other frequencies in a voice channel compared with a reference frequency of one kilohertz