Test: Analog Electronics - 1 - Electrical Engineering (EE) MCQ
25 Questions MCQ Test - Test: Analog Electronics - 1
To prevent a DC return between source and load, it is necessary to use
For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100
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Which of the following oscillators is suitable for frequencies in the range of mega hertz?
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
and VC = 0.5 x 20 = 10 V.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 ZL 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
or 120 mA.
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
= -100 mV.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
for oscillation
AB = 1 ∠0ºor 360º.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 ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then RB =
.In the amplifier circuit of figure hfe = 100 and hie = 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.
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