Electrical Engineering - Online Test
Q1. In the following network, the voltage magnitudes at all buses are equal to 1 p.u., the voltage phase angles are very small, and the line resistances are negligible. All the line reactances are equal to j1 Ω.
If the base impedance and the line-to line base voltage are 100 ohms and 100kV respectively, then the real power in MW delivered by the generator connected at the slack bus is
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. Which one of the following statements is true for all real symmetric matrices?
Answer : Option A
Explaination / Solution:
Eigen values of a real symmetric matrix are all real
Q3. In a constant V/f control of induction motor, the ratio V/f is maintained constant from 0 to base frequency, where V is the voltage applied to the motor at fundamental frequency f. Which of the following statements relating to low frequency operation of the motor is TRUE?
Answer : Option B
Explaination / Solution:
During constant V/f control, at low frequency, the voltage also applied to the induction motor is low. Hence the stator flux also decreases from its rated value.
Q4. 
Consider the following circuit which uses a 2-to-1 multiplexer as shown in the figure below. The Boolean expression for output F in terms of A and B is
Answer : Option D
Explaination / Solution:
Q5. Consider the Op-Amp circuit shown in the figure. 
If 
then the minimum and maximum
values of ϕ (in radians) are respectively
then the minimum and maximum
values of ϕ (in radians) are respectively
Answer : Option C
Explaination / Solution:
Q6. 
The above synchronous sequential circuit built using JK flip-flops is initialized with
Q2Q1Q0 = 000. The state sequence for this circuit for the next 3 clock cycles is
Answer : Option C
Explaination / Solution:
Q7. A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120º duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, is
Answer : Option A
Explaination / Solution:
Q8. The driving point impedance of the following network is given by
The component values are
Answer : Option D
Explaination / Solution:
Q9. The value of the integral of the function g(x,y) = 4x3 + 10y4 along the straight
line segment from the point (0,0) to the point (1,2) in the x - y plane is
Answer : Option A
Explaination / Solution:
Q10. Two identical NMOS transistors M1 and M2 are connected as shown below.
Vbias is chosen so that both transistors are in saturation. The equivalent gm of
the pair is defied to be 
at constant Vout 
at constant Vout The equivalent gm of the pair is
Answer : Option C
Explaination / Solution:
No Explaination.
