Electrical Engineering - Online Test
Q1. A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1Ω/m . If the line is distortion less, the attenuation constant(in Np/m) is
Answer : Option D
Explaination / Solution:
For distortion less transmission line characteristics impedance
Q2. 
Consider a three-phase, 50Hz, 11kV distribution system. Each of the conductors is suspended by an insulator string having two identical porcelain insulators. The self-capacitance of the insulator is 5 times the shunt capacitance between the link and the ground, as shown in the figure. The voltage across the two insulators are
Answer : Option B
Explaination / Solution:
No Explaination.
Q3. For the circuit shown, the counter state (Q1Q0) follows the sequence
Answer : Option A
Explaination / Solution:
Q4. In the circuit below, the diode is ideal. The voltage V is given by
Answer : Option A
Explaination / Solution:
Let diode be OFF. In this case 1 A current will flow in resistor and voltage across resistor will be V = 1.V
Diode is off, it must be in reverse biased, therefore
Vi- 1 > 0 " Vi > 1
Thus for Vi > 1 diode is off and V = 1V
Option (B) and (C) doesn’t satisfy this condition.
Let Vi < 1. In this case diode will be on and voltage across diode will be zero and
V = Vi
Thus V = min(Vi,1)
Q5. Let 
. Consider the set ܵ of all vectors 
such that a2 + b2 = 1 where 
Then ܵ is
. Consider the set ܵ of all vectors such that a2 + b2 = 1 where Then ܵ is
Answer : Option C
Explaination / Solution:
Q6. The switch in the figure below was closed for a long time. It is opened at t = 0. The current in
the inductor of 2 H for
t ≥ 0 is
Answer : Option A
Explaination / Solution:
Q7. For the system 2/(s+1), the approximate time taken for a step response to reach 98% of its final value is
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. 
Given the finite length input x[n] and the corresponding finite length output y[n] of an LTI system as shown below, the impulse response h[n] of the system is
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. . Consider a three-core, three-phase, 50Hz, 11kV cable whose conductors are denoted as R, Y
and B in the figure. The inter-phase capacitance (C1) between each pair of conductors is 0.2µF
and the capacitance between each line conductor and the sheath is 0.4.µF. The per-phase
charging current is
Answer : Option A
Explaination / Solution:
No Explaination.
Q10.
For a message signal 
and carrier of frequency fc which of thefollowing represents a single side-band (SSB) signal ?
Answer : Option C
Explaination / Solution:
