Electronics Engineering - Online Test
Q1. In cylindrical coordinate system, the potential produced by a uniform ring charge is given by φ = f(r, z), where f is a continuous function of r and z. Let 
be the resulting electric field. Then the magnitude of ∇ ×
be the resulting electric field. Then the magnitude of ∇ ×
Answer : Option B
Explaination / Solution:
Q2. The figure shows the high-frequency capacitance - voltage characteristics of Metal/Sio2/silicon (MOS) capacitor having an area of 1 × 10-4 cm2. Assume that the permittivities (ε0εr) of silicon and Sio are 1 × 10-12 F/cm and 3.5 × 10-13 F/ cm respectively.
The maximum depletion layer width in silicon is
Answer : Option B
Explaination / Solution:
Q3. The input voltage given to a converter is
The current drawn by the converter is
The active power drawn by the converter is
Answer : Option B
Explaination / Solution:
Q4. Given that f(y) = | y | / y, and q is any non-zero real number, the value of | f(q) - f(-q) | is
Answer : Option D
Explaination / Solution:
Q5. Given 
. If C is a counterclockwise path in the z-plane such that |z + 1| = 1, the value
of 
is
. If C is a counterclockwise path in the z-plane such that |z + 1| = 1, the value
of is
Answer : Option C
Explaination / Solution:
Q6. The i-v characteristics of the diode in the circuit given below are
The current in the circuit is
Answer : Option D
Explaination / Solution:
Q7. The state transition diagram for the logic circuit shown is
Answer : Option D
Explaination / Solution:
Q8. Consider the following circuit involving three D-type flip-flops used in a certain
type of counter configuration.
If all the flip-flops were reset to 0 at power on, what is the total number of
distinct outputs (states) represented by PQR generated by the counter?
Answer : Option C
Explaination / Solution:
So Total number of distinct outputs is 4
Q9. Three moving iron type voltmeters are connected as shown below. Voltmeter
readings are V, V1 and V2 as indicated. The correct relation among the voltmeter
readings is
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. An air-filled rectangular waveguide has inner dimensions of 3 cm × 2 cm.
The wave impedance of the TE2 mode of propagation in the waveguide at a
frequency of 30 GHz is (free space impedance η0 = 377Ω)
Answer : Option C
Explaination / Solution:
