67952. Assertion (A): Class A and Class B amplifier predominate in audio applications.Reason (R): Class C amplifier is used at radio frequencies.
67953. At midband frequencies the coupling capacitor in RC coupled CE amplifier may be considered as
67954. An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. What percentage of feedback will cause oscillations?
67955. The bandwidth of an amplifier is BW, of n-stage of such as amplifier are cascaded, the bandwidth will become
67956. If a class C power amplifier has an input signal with frequency of 200 kHz and the width of collector current pulses of 0.1 ms, then the duty cycle of the amplifier will be
67957. An ideal voltage amplifier should have
67958. The h parameter equivalent circuit of BJT has one voltage source and one current source.
67959. The voltage eo indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated?
67960. In an RC-coupled amplifier for improving the low frequency response
67961. The circuit of figure is
67962. The minimum gate source voltage that creates the n-type inversion layer is called
67963. In figure gain bandwidth product is
67964. Consider the following statementsA totem pole configuration used in the output stage if an op-amp has the advantage of using Only n-p-n BJTsComplementary symmetrical pair of transistorsOnly one transistor Which of these statements is/are correct?
67965. Assertion (A): An op-amp amplifier can amplify dc signalReason (R): An op-amp amplifier is a direct coupled amplifier
67966. The most common method for biasing a JFET is
67967. Which of the following figures is an ideal equivalent circuit of a n-p-n transistor?
67968. Which op-amp circuit uses a capacitor in series with input and resistance in feedback path?
67969. For class B operation the theoretical maximum efficiency is
67970. Typical values of current gains for CE, CB and CC amplifiers are
67971. To draw ac equivalent circuit for a CE amplifier we should
67972. In the circuit of figure, the value of re is (neglecting vbe)
67973. In a transistor amplifier, the reverse saturation current ICO
67974. When the emitter current of a transistor is changed by 1 mA, its collector current changes by 0.990 mA. The common-emitter short-circuit current gain is
67975. In figure Vi may vary from 15 to 20 V and load current may vary from 20 mA to 100 mA. Suitable maximum value of R is
67976. Assertion (A): A common collector amplifier is used for matching a high impedance source to a low impedance loadReason (R): A common collector amplifier has a near unity voltage gain
67977. In a crystal oscillator of the Colpitt's oscillator type, the crystal is put is place of the
67978. Astable multivibrator has
67979. Most small signal transistors are
67980. A FET is a better clapper than a BJT because it has
67981. The input gate current of FET is closer to
67982. When a 1 V increase in gate voltage changes the drain current 10 mA in an FET, its gm equals
67983. In the circuit shown in the given figure, the current flowing through resistance of 100 Ω would be
67984. A sine wave is passed through an amplifier which severely limits it symmetrically. If then passes to a second amplifier which is narrow band and tuned to the frequency of the original sine wave. What will be the output wave from this second amplifier?
67985. In which configuration is ac collector voltage zero?
67986. Which connection is rarely used?
67987. Assertion (A): The main use of positive feedback is in oscillator circuits.Reason (R): In an oscillator the loop gain Aβ is kept slightly more than unity
67988. In a transistor which of the following region is very lightly doped and is very thin?
67989. The properties of FETs closely resemble those of a
67990. The purpose of providing groundings rings with MOSFET is to
67991. The minimum value of hfe of a transistor used in RC phase shift oscillator is
67992. Self bias is an example of __________ feedback that tends to stabilize the drain current against changes in temperature and JFET replacement.
67993. In voltage amplifiers, the load resistance
67994. The RC network of wein bridge oscillator consists of resistors and capacitors of values R = 220 kΩ and C = 250 PF Determine the frequency of oscillation
67995. Name the Egyptian President against whom people of Egypt revolted in 2011:
67996. In a single stage differential amplifier, the output offset voltage is basically dependent on the mismatch of
67997. In figure the dc load line will meet the y and x axis respectively at
67998. Transformer coupling is mostly used in
67999. Which of the following method cannot be used to increase the bandwidth for cascaded RF amplifier stages?
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