Test: Analog Electronics - 1 - Electrical Engineering (EE) MCQ

If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of

A half wave diode circuit using ideal diode has an input voltage 20 sin ωt volts. Then average and rms values of output voltage are

An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be

In figure v₁ = 8 V and v₂ = 4 V. Which diode will conduct?

The load impedance Z_L of a CE amplifier has R and L in series. The phase difference between output and input will be

Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be

If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

In figure The minimum and maximum load currents are

In figure, V_EB = 0.6 V, β = 99. Then V_C and I_C are

The input impedance of op-amp circuit of figure is

In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit

To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use

The output V₀ in figure is

In a CE amplifier the input impedance is equal to the ratio of

For a system to work, as oscillator the total phase shift of the loop gain must be equal to

An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a

The transistor of following figure in Si diode with a base current of 40 μA and I_CBO = 0, if V_BB = 6V, R_E = 2 kΩ and β = 90, I_BQ = 20 μA then R_B =

In the amplifier circuit of figure h_fe = 100 and h_ie = 1000 Ω. The voltage gain of amplifier is about

The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.

Assertion (A): CE amplifier is the most widely used BJT amplifier

Reason (R): CE amplifier has zero phase difference between input and output

Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically

Reason (R): The output characteristics of a transistor is nonlinear.

Negative feedback reduces noise originating at the amplifier input.