Electrical Engineering - Online Test
Q1. 
A solar energy installation utilize a three – phase bridge converter to feed energy into power system through a transformer of 400V/400 V, as shown below.
The energy is collected in a bank of 400 V battery and is connected to converter
through a large filter choke of resistance 10Ω.
The maximum current through the battery will be
Answer : Option A
Explaination / Solution:
Q2. A two-phase load draws the following phase currents: 
These currents are balanced if ϕ1 is equal to
These currents are balanced if ϕ1 is equal to
Answer : Option D
Explaination / Solution:
Q3. The minimum number of D flip-flops needed to design a mod-258 counter is
Answer : Option A
Explaination / Solution:
2n ≥ 258 ⇒ n = 9
Q4. If 
then the region of convergence (ROC) of its Z-transform in the
Z-plane will be
then the region of convergence (ROC) of its Z-transform in the
Z-plane will be
Answer : Option C
Explaination / Solution:
Q5. If 
, then the value of xx is
, then the value of xx is
Answer : Option A
Explaination / Solution:
Q6. A half-controlled single-phase bridge rectifier is supplying an R-L load. It is operated at a firing angle α and the load current is continuous. The fraction of cycle that the freewheeling diode conducts is
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. The output Y of a 2-bit comparator is logic 1 whenever the 2-bit input A is greater than the 2-bit input B. The number of combinations for which the output is logic 1, is
Answer : Option B
Explaination / Solution:
Q8. An analog voltmeter uses external multiplier settings. With a multiplier setting of 20 kΩ it reads
440 V and with a multiplier setting of 80 kΩ it reads 352 V. For a multiplier setting of 40 kΩ the
voltmeter reads
Answer : Option D
Explaination / Solution:
Q9. Two semi-infinite dielectric regions are separated by a plane boundary at y=0. The
dielectric constant of region 1 (y<0) and region 2 (y>0) are 2 and 5, Region 1 has uniform
electric field 
are unit vectors along the x, y and
z axes, respectively. The electric field region 2 is
are unit vectors along the x, y and
z axes, respectively. The electric field region 2 is
Answer : Option A
Explaination / Solution:
Q10. In a Direct Sequence CDMA system the chip rate is 1.2288 × 106 chips per
second. If the processing gain is desired to be AT LEAST 100, the data rate
Answer : Option A
Explaination / Solution:
