Q. 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

View solution

Q. 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

View solution

Q. In the graphical analysis of an amplifier circuit, the slope of dc load line depends on

View solution

Q. In a self bias circuit for CE amplifier, an increase in emitter resistance RE results in

View solution

Q. For a BJT if β = 50, ICEO = 3 μA and IC = 1.2 mA then IE

View solution

Q. When the circuit is switched on, the loop gain of a Wien bridge oscillator is

View solution

Q. The input to integrating op-amp is a rectangular wave. The output will be

View solution

Q. The most widely used diode rectifier circuit is

View solution

Q. The main advantage of a crystal oscillator

View solution

Q. Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C

View solution

Q. A voltage tripler circuit and voltage quadrupler circuit use identical components. Then

View solution

Q. A Ge diode operated at a junction temperature of 27°C. For a forward current of 10 mA, VD is found to be 0.3 V. If VD = 0.4 V then forward current will be

View solution

Q. In a power amplifier the collector current flows for 270° of the input cycle. The operations is

View solution

Q. An amplifier has input impedance of 4 kΩ and output impedance of 80 kΩ. It is used in negative feedback circuit with 10% feedback. If open loop gain is 90, the closed loop input and output impedances are

View solution

Q. In a negative feedback amplifier A = 100, β = 0.04 and Vs = 50 mV, then feedback will be

View solution

Q. A voltage doubler circuit is fed by a voltage Vm sin ωt. The output voltage will be nearly 2 Vm only if

View solution

Q. The purpose of connecting a coupling capacitor in the output circuit of an amplifier is

View solution

Q. A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is

View solution

Q. If the midband gain of an amplifier is 40 dB, the gain at half power frequency is

View solution

Q. 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

View solution