Electronics Engineering - Online Test
Q1. The second order dynamic system
has the matrices P, Q and R as follows:
The system has the following controllability and observability properties:
Answer : Option C
Explaination / Solution:
Q2. A function y(t), such that y(0) = 1 and y(1) = 3e-1, is a solution of the differential equation 
Then y(2) is
Then y(2) is
Answer : Option B
Explaination / Solution:
Q3. The Boolean expression 
simplifies to
simplifies to
Answer : Option A
Explaination / Solution:
Q4. One end of a loss-less transmission line having the characteristic impedance of 75Ω and length of 1 cm is short-circuited. At 3 GHz, the input impedance at the other end of transmission line is
Answer : Option D
Explaination / Solution:
Q5. The full form of the abbreviations TTL and CMOS in reference to logic families are
Answer : Option C
Explaination / Solution:
TTL -> Transistor - Transistor logic
CMOS -> Complementary Metal Oxide Semi-conductor
Q6. 
In the following transistor circuit, 
, and 𝛽 and all the capacitances are very large
, and 𝛽 and all the capacitances are very largeThe mid-band voltage gain of the amplifier is approximately
Answer : Option D
Explaination / Solution:
The small signal model is shown in fig below
Q7. 
The power electronic converter shown in the figure has a single-pole double-throw switch. The pole P of the switch is connected alternately to throws A and B. The converter shown is a _______
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. In the circuit shown below, the knee current of the ideal Zener diode is 10 mA. To maintain 5 V
across RL, the minimum value of RL in Ω and the minimum power rating of the Zener diode in mW
respectively are
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. What is the Boolean expression for the output f of the combinational logic circuit
of NOR gates given below?
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. A plane wave having the electric field components 
V/m and traveling in free space is incident normally on a lossless medium with 
which occupies the region y ≥ 0. The reflected magnetic field component is given by
V/m and traveling in free space is incident normally on a lossless medium with which occupies the region y ≥ 0. The reflected magnetic field component is given by
Answer : Option A
Explaination / Solution:
In the given problem
Reflection coefficient
negative So magnetic field component does not change its direction Direction of incident magnetic field
So, reflection magnetic field component
