Electronics Engineering - Online Test
Q1. The unit step response of a system with the transfer function 
is given by
which one of the following waveforms?
is given by
which one of the following waveforms?
Answer : Option A
Explaination / Solution:
Q2. Suppose x1(t) and x2(t) have the Fourier transforms as shown below
Which one of the following statements is TRUE?
Answer : Option C
Explaination / Solution:
Q3.
Noise with double-sided power spectral density on K over all frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is
Answer : Option C
Explaination / Solution:
Q4. 
The second harmonic component of the periodic waveform given in the figure has an amplitude of
Answer : Option A
Explaination / Solution:
No Explaination.
Q5. 
In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2
The value of current I0 is approximately
Answer : Option B
Explaination / Solution:
Since, emitter area of transistor Q1 is half of transistor Q2, so current
Q6. The transistor circuit shown uses a silicon transistor with VBE = 0.7V, IC ≈ IE and a dc current
gain of 100. The value of V0 is
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. 
Consider the common emitter amplifier shown below with the following circuit parameters:
The resistance seen by the source vs is
Answer : Option B
Explaination / Solution:
Q8. 
Assuming an ideal transformer,. The Thevenin’s equivalent voltage and impedance as seen from the terminals x and y for the circuit in figure are
Answer : Option A
Explaination / Solution:
Q9. The expression for an electric field in free space is 
where x, y, z represent the spatial coordinates, t represents time, and 𝜔,k are constants. This electric field
where x, y, z represent the spatial coordinates, t represents time, and 𝜔,k are constants. This electric field
Answer : Option C
Explaination / Solution:
Q10. The transfer function of a system is 
The steady state output y(t) is A cos(2t + φ) for
the input cos(2t). The values of A and φ, respectively are
The steady state output y(t) is A cos(2t + φ) for
the input cos(2t). The values of A and φ, respectively are
Answer : Option B
Explaination / Solution:
