Electrical Engineering - Online Test
Q1. A three-phase, 33kV oil circuit breaker is rated 1200 A, 2000 MVA, 3s. The symmetrical breaking current is
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. The electric and magnetic fields for a TEM wave of frequency 14 GHz in a
homogeneous medium of relative permittivity εr and relative permeability
Assuming the speed of light in free space to be 3 × 108 m/s, the intrinsic
impedance of free space to be 120π, the relative permittivity εr of the medium
and the electric field amplitude Ep are
Answer : Option D
Explaination / Solution:
From the expressions of 
we can write,
we can write,
Q3. A field excitation of 20 A in a certain alternator results in an armature current of 400A in short circuit and a terminal voltage of 2000V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200A is
Answer : Option D
Explaination / Solution:
Q4. Consider the oscillator circuit shown in the figure. The function of the network (shown in
dotted lines) consisting of the
100kΩ resistor in series with the two diodes connected back-toback
is to:
Answer : Option A
Explaination / Solution:
When the output voltage is positive the diode D1 is turned on making 100kΩ resistor to become parallel to 22.1kΩ. So the gain is reduced. When the output voltage becomes negative the diode D2 is turned on thereby again 100kΩ resistor to become parallel to 22.1kΩ. So the gain is reduced. With the use of diodes, the non ideal OP-Amp is made stable to produce steady
Q5. The Miller effect in the context of a Common Emitter amplifier explains
Answer : Option D
Explaination / Solution:
Miller effect increase input capacitance, so that there will be decrease in gain in the high frequency cutoff frequency.
Q6. The Boolean function Y = AB + CD is to be realized using only 2 - input NAND gates. The minimum number of gates required is
Answer : Option B
Explaination / Solution:
This is SOP form and we require only 3 NAND gate
Q7. The Boolean expression 
can be
minimized to
can be
minimized to
Answer : Option D
Explaination / Solution:
Q8. Shaquille O’ Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will successfully make exactly 6 free throws in 10 attempts?
Answer : Option A
Explaination / Solution:
Q9. A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is 4 kV/cm, the electric field in the region B, in kV/cm, is
Answer : Option C
Explaination / Solution:
Q10. 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:
