Electrical Engineering - Online Test
Q1. 
For the asymptotic Bode magnitude plot shown below, the system transfer function can be
Answer : Option A
Explaination / Solution:
Initial slope is zero, so K = 1
At corner frequency 𝜔1 = 0.5 rad/ sec, slope increases by +20 dB/decade, so there is a zero in the transfer function at 𝜔1
At corner frequency 𝜔2 = 10 rad/ sec, slope decreases by -20 dB/decade and becomes zero, so there is a pole in transfer function at 𝜔2
Transfer function 
Q2. Consider the following statements for a metal oxide semiconductor field effect transistor
(MOSFET):
P: As channel length reduces, OFF-state current increases.
Q:As channel length reduces, output resistance increases.
R: As channel length reduces, threshold voltage remains constant.
S: As channel length reduces, ON current increases.
Which of the above statements are INCORRECT?
Answer : Option C
Explaination / Solution:
Q3. If the semi-circular control D of radius 2 is as shown in the figure, then the
value of the integral 
is
is
Answer : Option A
Explaination / Solution:
Q4. A 5-point sequence x n is given as x - 3 = 1, x - = 1, x - 1 = , x = 5 and x 1 = 1. Let X(ei𝜔) denoted the discrete-time Fourier transform of x n.
The value of 
is
is
Answer : Option B
Explaination / Solution:
Q5. 
In the circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and β= 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op-amp.
Answer : Option D
Explaination / Solution:
The circuit is shown in fig below
Q6. The Column-I lists the attributes and the Column-II lists the modulation systems. Match the attribute to the modulation system that best meets it
Column-I
P. Power efficient transmission of signals
Q. Most bandwidth efficient transmission of voice signals
R. Simplest receiver structure
S. Bandwidth efficient transmission of signals with Significant dc component
Column-II
1. Conventional AM
2. FM
3. VSB
4. SSB-SC
Answer : Option B
Explaination / Solution:
In FM the amplitude is constant and power is efficient transmitted. No variation in power.
There is most bandwidth efficient transmission in SSB- SC. because we transmit only one side band.
Simple Diode in Non linear region ( Square law ) is used in conventional AM that is simplest receiver structure.
In VSB dc. component exists.
Q7. For parallel RLC circuit, which one of the following statements is NOT correct ?
Answer : Option D
Explaination / Solution:
A parallel RLC circuit is shown below :
Input impedance
Q8.
Two discrete time system with impulse response h1[n] = 𝛿[n - 1] and h2[n] = 𝛿[n - 2] are connected in cascade. The overall impulse response of the cascaded system is
Answer : Option C
Explaination / Solution:
Q9. The residues of a complex function 
at its poles are
at its poles are
Answer : Option C
Explaination / Solution:
Q10. What is the voltage Vout in the following circuit?
Answer : Option C
Explaination / Solution:
The transfer characteristics of the CMOS inverter is as follows
Since the inverter is connected in feedback loop formed by connecting
10XΩ resistor between
the output and input, the output goes and stays at the middle of the characteristics
Va Switching threshold of inverter
