Electronics Engineering - Online Test
Q1. Consider the Op-Amp circuit shown in the figure. 
If 
then the minimum and maximum
values of ϕ (in radians) are respectively
then the minimum and maximum
values of ϕ (in radians) are respectively
Answer : Option C
Explaination / Solution:
Q2. 
The above synchronous sequential circuit built using JK flip-flops is initialized with
Q2Q1Q0 = 000. The state sequence for this circuit for the next 3 clock cycles is
Answer : Option C
Explaination / Solution:
Q3. A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120º duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is
Answer : Option A
Explaination / Solution:
Q4. The driving point impedance of the following network is given by
The component values are
Answer : Option D
Explaination / Solution:
Q5. The value of the integral of the function g(x,y) = 4x3 + 10y4 along the straight
line segment from the point (0,0) to the point (1,2) in the x - y plane is
Answer : Option A
Explaination / Solution:
Q6. Two identical NMOS transistors M1 and M2 are connected as shown below.
Vbias is chosen so that both transistors are in saturation. The equivalent gm of
the pair is defied to be 
at constant Vout 
at constant Vout The equivalent gm of the pair is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. Thyristor T in the figure below is initially off and is triggered with a single pulse of
width 10µs . It is given that 
Assuming latching
and holding currents of the thyristor are both zero and the initial charge on C is
zero, T conducts for
Assuming latching
and holding currents of the thyristor are both zero and the initial charge on C is
zero, T conducts for
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. The Maxwell’s bridge shown in the figure is at balance. The parameters of the inductive coil are
Answer : Option A
Explaination / Solution:
No Explaination.
Q9. The open-loop transfer function of a dc motor is given as 
When connected in
feedback as shown below, the approximate value of Ka that will reduce the time constant of the
closed loop system by one hundred times as compared to that of the open-loop system is
When connected in
feedback as shown below, the approximate value of Ka that will reduce the time constant of the
closed loop system by one hundred times as compared to that of the open-loop system is
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Consider an LTI system with impulse response 
If the output of the system is 
then the input, x(t), is given by
If the output of the system is then the input, x(t), is given by
Answer : Option B
Explaination / Solution:
