Electrical Engineering - Online Test
Q1.
If segments a to g are considered as functions of P1 and P2, then which of the following is correct
Answer : Option B
Explaination / Solution:
LED d is 1 all condition and also it depends on
d = c + e
Q2.
Assuming zero initial condition, the response y(t) of the system given below to a unit step input u(t) h is
Answer : Option B
Explaination / Solution:
The Laplace transform of unit step fun n is 
U(s)=1/s
So, the O/P of the system is given as
For zero initial condition, we check
Hence, the O/P is correct which is
its inverse Laplace transform is given by
Y(t)=tu(t)
Q3. An antenna pointing in a certain direction has a noise temperature of 50K. The ambient
temperature is 290 K. The antenna is connected to a pre-amplifier that has a noise figure of 2
dB and an available gain of 40 dB over an effective bandwidth of 12 MHz. The effective input
noise temperature Te for the amplifier and the noise power Pao at the output of the preamplifier,
respectively, are
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. The Nyquist plot of the transfer function
does not encircle the point (1+ j0) for K = 10 but does encircle the point (-1+ j0) for K = 100. Then the closed loop system (having unity gain feedback) is
Answer : Option B
Explaination / Solution:
Q5. The polar plot of the transfer function 
will be in the
will be in the
Answer : Option A
Explaination / Solution:
Q6. A two-port network has scattering parameters given by 
If the
port-2 of the two port is short circuited, the S11 parameter for the resultant one
If the
port-2 of the two port is short circuited, the S11 parameter for the resultant one
Answer : Option B
Explaination / Solution:
No Explaination.
Q7.
Consider the matrix 
The value of eP is
The value of eP is
Answer : Option D
Explaination / Solution:
Q8.
What are the minimum numbers of NOT gates and 2 - input OR gates required to design the logic of the driver for this 7 - Segment display
Answer : Option D
Explaination / Solution:
As shown in previous solution 2 NOT gates and 3-OR gates are required.
Q9. If the unit step response of a network is (1 – e-αt), then its unit impulse response is
Answer : Option A
Explaination / Solution:
Q10. The electric field of a uniform plane wave travelling along the negative z direction is given by
the following equation:
This wave is incident upon a receiving antenna placed at the origin and whose radiated electric
field towards the incident wave is given by the following equation:
The polarization of the incident wave, the polarization of the antenna and losses due to the
polarization mismatch are, respectively,
Answer : Option C
Explaination / Solution:
No Explaination.
