Electrical Engineering - Online Test
Q1. Consider the following circuit using an ideal OPAMP. The I-V characteristic of
the diode is described by the relation 
where VT = 25 mV, I0 = 1μ A and V is the voltage across the diode (taken as positive for forward bias). For
an input voltage Vi = -1 V, the output voltage V0 is
where VT = 25 mV, I0 = 1μ A and V is the voltage across the diode (taken as positive for forward bias). For
an input voltage Vi = -1 V, the output voltage V0 is
Answer : Option B
Explaination / Solution:
Q2. 
Consider a delta connection of resistors and its equivalent star connection as shown below. If all elements of the delta connection are scaled by a factor k, k>0, the elements of the corresponding star equivalent will be scaled by a factor of
Answer : Option B
Explaination / Solution:
No Explaination.
Q3. An ammeter has a current range of 0-5A, and its internal resistance is 0.2Ω. In order to change
the range to 0-25A, we need to add a resistance of
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. The transfer function 
of the circuit shown below is
of the circuit shown below is
Answer : Option D
Explaination / Solution:
No Explaination.
Q5. A matrix has eigenvalues –1 and –2. The corresponding eigenvectors are 
respectively. The matrix is
respectively. The matrix is
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. The state variable formulation of a system is given as 
The response y(t) to the unit step input is
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. 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.
The voltage phase angles in rad at buses 2 and 3 are
Answer : Option C
Explaination / Solution:
No Explaination.
Q8. A three-phase, 4pole, self excited induction generator is feeding power to a load at a
frequency f1. If the load is partially removed, the frequency becomes f2. If the speed of the
generator is maintained at 1500 rpm in both the cases, then
Answer : Option C
Explaination / Solution:
Q9. When a bipolar junction transistor is operating in the saturation mode, which one of the following statement is TRUE about the state of its collector-base (CB) and the baseemitter (BE) junctions?
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. A Boolean function f(A,B,C,D) = ∏(1,5,12,15) is to be implemented using an 8×1
multiplexer (A is MSB). The inputs ABC are connected to the select inputs S2S1S0 of the
multiplexer respectively. 
Which one of the following options gives the correct inputs to pins 0,1,2,3,4,5,6,7 in order?
Answer : Option B
Explaination / Solution:
