68001. The h parameter h11 is the same in CE and CC circuit.
68002. A second-order band-pass active filter can be obtained by cascading a low pass second order section having cut off frequency fOH with a high pass second order section having cut-off frequency fOL provided
68003. Class A and Class B power amplifiers predominate at
68004. In a class C operation VCC = 30 V and VCE(sat) = 2 V. The efficiency is
68005. In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is
68006. A voltage tripler circuit uses
68007. An op-amp uses
68008. In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.
68009. One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be
68010. 3N 200 is a
68011. The A.C. resistance of the emitter diode will be
68012. For a transistor amplifier with self biasing network, the following components are used. R1 = 4 kΩ, R2 = 4 kΩ, RC = 1 kΩ. The approximate value of the stability factor 'S' will be
68013. The gate electrode in the FET corresponds to the
68014. The properties of JFET resemble those of
68015. Assertion (A): Transformer coupling has the disadvantage of the weight of transformer and Saturation of coreReason (R): Transformer coupling is very suitable for impedance matching
68016. A Hartley oscillator is used for generation
68017. In a CE class A amplifier the quiescent current and voltage are ICQ and VCEQ. The maximum power output can be
68018. In a P-N-P junction transistor as compared to base region is more heavily doped so that
68019. In every practical oscillator the loop gain is slightly more than unit and amplitude of oscillations is limited by
68020. Which of the following is not valid in case of FETs?
68021. When the emitter current of a transistor is changed by 1 mA, its collector current changes by 0.990 mA. The common base short circuit current gain a for the transistor is
68022. Which of the following amplifier circuits has highest input impedance?
68023. Which of the following device acts as an N-P-N and a P-N-P transistor connected base to base and emitter to controller?
68024. A differentiating amplifier has capacitor in the input path.
68025. Which of the following statement about TRIAC is incorrect?
68026. A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are
68027. Tuned amplifiers are used at radio frequencies.
68028. The knee voltages in silicon and germanium diodes respectively are
68029. In calculating input impedance, the load impedance is considered to be connected at the output.
68030. In a transistor βdc is likely to vary between 100 and 400. The proper value of βdc to be used to located Q point is
68031. Which of the following noise becomes of great importance at high frequencies?
68032. Assertion (A): The duty cycle of a class C amplifier affects the power dissipation of transistorReason (R): At higher harmonics the efficiency of a class C amplifier becomes poor
68033. If the op-amp in figure has a unity gain frequency of 1 MHz, the cut off frequency is
68034. In a self bias circuit for CE amplifier the collector supply voltage is made twice. The collector current will
68035. In a full wave voltage doubler circuit, the input frequency is 560 Hz. The ripple frequency is
68036. Assertion (A): A tuned amplifier uses a parallel tuned circuitReason (R): A tuned amplifier is used to amplify a narrowband frequencies
68037. The ac collector current is nearly equal to
68038. From a measurement of the rise time of the output pulse of an amplifier whose input is a small amplitude square wave, one can estimate the following parameter of the amplifier
68039. In an amplifier, if the output current flows for 120° of the input cycle, the class of amplifier will be
68040. Assertion (A): If we overdrive an amplifier the output signal may get clippedReason (R): To dissipate heat to atmosphere a heat sink is sometimes attached to the case of transistor
68041. Which op-amp circuit uses a diode as one of the circuit components?
68042. Overall efficiency of class B amplifier is
68043. For a transistor to have-a larger β it must have and a
68044. JFET is also known as
68045. Drain feedback bias is often used with
68046. CMRR of a difference amplifier is equal to
68047. In a class C amplifier, full cycle conductor of the current is achieved by employing
68048. Higher order active filters are used for variable
68049. Which of the following statement is false?
68050. Assertion (A): The main use of Miller integrator is to generate rampReason (R): An inverting amplifier can handle more than one input at the same time.
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