67901. The input to integrating op-amp is a rectangular wave. The output will be
67902. The most widely used diode rectifier circuit is
67903. The organ which is primarily concerned with immunity:
67904. The main advantage of a crystal oscillator
67905. A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is
67906. If the midband gain of an amplifier is 40 dB, the gain at half power frequency is
67907. It is desired to reduce distortion in an amplifier from 8% to 2% by using 5% negative feedback. The open and closed loop gains respectively are
67908. An ideal op-amp requires
67909. The JFET in the circuit shown in figure has an IDSS = 10 mA and Vp = -5V. The value of the resistance Rs for a drain current IDS = 6.4 mA is
67910. Whcih branch of medicine was Rabindranath Tagore good at?
67911. The alloy of steel used in making automobile parts is:
67912. In figure the zener has a resistance of 5 ohms. As the load resistance is varied, the output voltage
67913. Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C
67914. The transistor of following figure in Si diode with a base current of 40 μA and ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then IEQ =
67915. In a self bias circuit for CE amplifier, an increase in emitter resistance RE results in
67916. For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IE
67917. When the circuit is switched on, the loop gain of a Wien bridge oscillator is
67918. The op-amp circuit shown in the figure is a filter. The type of filter and its cut off type of filter and its cut off frequency are respectively.
67919. In a capacitor filter, the time constant RLC should be small.
67920. A 741 type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a -3dB bandwidth of
67921. In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is
67922. In the circuit of figure, PIV can be up to
67923. It is desired to reduce distortion in a CE amplifier circuit. We should
67924. In the circuit of figure β = 50 and VBE = 0.5 V. The quiescent value of base current IB is
67925. For a push pull circuit the most favoured biasing method is
67926. In feedback amplifier the closed loop gain is nearly independent of open loop gain and depends only on the feedback factor.
67927. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased, the transistor will operate in
67928. A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What percentage negative feedback should be introduced to the amplifier so that linear oscillations result?
67929. The advantage of Weinbridge oscillator over the phase shift oscillator is that oscillator the frequency may be varied over a range of
67930. In figure the input and output Miller capacitances are
67931. An inverting amplifier has R1 = 10 kΩ, and Rf = 150 kΩ then the O/P voltage, if input voltage Vi = 1 volt.
67932. Figure uses 10 V zener diode. The minimum and maximum current through series resistance are
67933. When Z1 << Z, The circuit of figure works as
67934. In a class C operation VCC = 40 V, RL = 50 Ω. The maximum load power can be
67935. IF VCC = 15 V, VCEQ = 5 V and ICQ = 50 mA, the efficiency in class A operation is
67936. A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is
67937. Which of the following best represents the bandwidth of an actual op-amp?
67938. For an ideal noise free transistor amplifier the noise factor is
67939. In a crystal
67940. Voltage VL in the circuit when Vs < 0 where D is an ideal diode. (Take R1 = Rs = RL = 1 Ω)
67941. Ultra high frequency oscillators work in the range
67942. N-channel FETs are superior to p-channel FETs because
67943. For the amplifier in figure, β = 800. The mid-band voltage gain V0/Vi is
67944. In the circuit of figure, v0 =
67945. Class C amplifier is suitable for
67946. In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in
67947. A Wien bridge is suitable for
67948. The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The noise factor is
67949. Assertion (A): The gain of an FET amplifier can be changed by changing gmReason (R): Most receivers use automatic gain control to counteract changes in volume caused by fading
67950. The element in the feedback circuit of a logarithmic amplifier using op-amp is
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