Electronics Engineering - Online Test
Q1. A closed loop system has the characteristic equation given by s3 + Ks2 +(K + 2)s + 3 = 0 For
this system to be stable, which one of the following conditions should be satisfied?
Answer : Option D
Explaination / Solution:
Q2. The period of the signal 
is
is
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. Suppose that the modulating signal is 
and the carrier signal is 
, which one of the following is a conventional AM signal without over-modulation
and the carrier signal is , which one of the following is a conventional AM signal without over-modulation
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. The current density in a medium is given by
The total current and the average current density flowing through the portion of a spherical
surface r = 0.8 m, 
are given, respectively, by
The total current and the average current density flowing through the portion of a spherical
surface r = 0.8 m, are given, respectively, by
Answer : Option A
Explaination / Solution:
No Explaination.
Q5. An n+ - n Silicon device is fabricated with uniform and non-degenerate donor doping concentrations of ND1 = 1 × 1018
cm-3 and ND2 = 1 × 1015
cm-3 corresponding to the n+ and n regions respectively. At the operational temperature T, assume complete impurity ionization, kT/q = 25 mV, and intrinsic carrier concentration to be ni = 1 × 1010 cm-3, What is the magnitude of the built-in potential of this device?
Answer : Option D
Explaination / Solution:
Q6. In the circuit shown below the op-amps are ideal. Then, Vout in Volts is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. The circuit diagram of a standard TTL NOT gate is shown in the figure. Vi = 25 V, the modes of operation of the transistors will be
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. In the circuit shown below, the voltage and current sources are ideal. The voltage (Vout) across the
current source, in volts, is
Answer : Option D
Explaination / Solution:
Q9. The transfer function of the system Y(s)/U(s) whose state-space equations are given below is:
Answer : Option D
Explaination / Solution:
Q10. The system represented by the input-output relationship 
is
is
Answer : Option B
Explaination / Solution:
No Explaination.
